Peter Minchin - Profile on Academia.edu (original) (raw)
Papers by Peter Minchin
IAVS Bulletin, 2020
When so many of us met in Bremen last July, I don't think we ever would have imagined the world s... more When so many of us met in Bremen last July, I don't think we ever would have imagined the world situation as it is today and that, among other impacts, it would have led us to cancel our annual symposium. This was a sad decision as for many of us IAVS is our scientific home and this event is a high point of our year. However, as events have transpired since that decision, I think it is clear to everyone that it was the only option. Now we need to think towards the future and how best to keep our linkages in IAVS strong until we can meet again. Our journals -Journal of Vegetation Science and Applied Vegetation Science continue to publish the results of high quality research and our recently launched journal Vegetation Classification and Survey provides new opportunities. You can subscribe to Contents Alerts for any of these journals by visiting the journal websites and following the links. You can keep up with the most recent news related to the journals by viewing and subscribing to the Vegetation Science Blog (). IAVS has numerous Working Groups and Regional Sections. These provide another way or remaining involved with IAVS through more focused or regional activities. Follow iavs.org/Working-Groups/Join-a-Group to learn more about these groups and how you can join, if you haven't already. If the situation with the pandemic improves, there may even be opportunities for smaller botanical excursions or regional meetings that could be promoted through these groups. Happier times in Bremen, July 2019 (© J. Dengler). Mountain pastures of Poiana Călineasa are situated above the Ghetari village in the Apuseni Carpathians, Romania. Wherever you look, time forgot this landscape in the end of the 19th century. July 2019. This colourful meadow on a steep north-facing slope in Marisel (Apuseni Carpathians, Romania) has never been ploughed. For the last five decades, this plot has had a stable management: it is annually mown in August, grazed by cows for one week in May and then again in autumn (September-October), manured in winter, cleared of shrub and trees in spring, and cleaned from Veratrum album by picking when necessary. August 2019.
Northeastern Naturalist, 2018
Since the 1950s, anthropogenic activity has caused the loss of millions of hectares of bottomland... more Since the 1950s, anthropogenic activity has caused the loss of millions of hectares of bottomland hardwood forest in the Upper Mississippi River Valley, causing population declines in bird populations. Restoration of these forest stands has been ongoing for the past 2 decades. We assessed bird species presence on sites in the Upper Mississippi River Valley to quantify diversity and relate presence to habitat conditions and sites' age since restoration. We observed higher mean diversities at mature bottomland-forest sites during the spring and autumn, but nested ANOVAs indicated no significant differences among restoration-age categories during spring. During the autumn, the 15-23-y and the mature bottomland-forest categories were significantly different from the <7-y category. Predictive habitat models differed among species, but presence of forest-dwelling birds was positively related to forested conditions, such as tree height and tree density. Overall, our analyses show that a variety of birds use these sites, and we suggest further exploration of how assemblages may change in future surveys.
Tree Physiology, 2005
Oleoresin flow is an important factor in the resistance of pines to attack by southern pine beetl... more Oleoresin flow is an important factor in the resistance of pines to attack by southern pine beetle, Dendroctonus frontalis Zimm., and its associated fungi. Abiotic factors, such as nutrient supply and water relations, have the potential to modify this plant-insect-fungus interaction; however, little is known of the effects of inoculation with beetle-associated fungi on oleoresin flow. We observed that constitutive and induced resin yield in loblolly pine, Pinus taeda L., were affected by either fungal inoculation (with the southern pine beetle-associated fungus Ophiostoma minus (Hedgcock) H. & P. Sydow) or silvicultural treatment. The effects of mass wounding (400 wounds m -2 ) and mass wounding and inoculation with O. minus were assessed by comparison with untreated (control) trees. The treatments were applied to trees in a 2 × 2 factorial combination of fertilizer and irrigation treatments. Fertilization did not significantly affect constitutive resin yield. Even as long as 105 days post-treatment, however, mass-inoculated trees produced higher induced resin yields than control or wounded-only trees, indicating a localized induced response to fungal inoculation. We noted no systemic induction of host defenses against fungal colonization. Although beetles attacking previously attacked trees face a greater resinous response from their host than beetles attacking trees that had not been previously attacked, the effect of an earlier attack may not last more than one flight season. Despite mass inoculations, O. minus did not kill the host trees, suggesting that this fungus is not a virulent plant pathogen.
Theory and models in vegetation science, 1987
Simulated vegetation data were used to assess the relative robustness of ordination techniques to... more Simulated vegetation data were used to assess the relative robustness of ordination techniques to variations in the model of community variation in relation to environment. The methods compared were local nonmetric multidimensional scaling (LNMDS), detrended correspondence analysis (DCA), Gaussian ordination (GO), principal components analysis (PCA) and principal coordinates analysis (PCoA). Both LNMDS and PCoA were applied to a matrix of Bray-Curtis coefficients. The results clearly demonstrated the ineffectiveness of the linear techniques (PCA, PCoA), due to curvilinear distortion. Gaussian ordination proved very sensitive to noise and was not robust to marked departures from a symmetric, unimodal response model. The currently popular method of DCA displayed a lack of robustness to variations in the response model and the sampling pattern. Furthermore, DCA ordinations of two-dimensional models often exhibited marked distortions, even when response surfaces were unimodal and symmetric. LNMDS is recommended as a robust technique for indirect gradient analysis, which deserves more widespread use by community ecologists.
Palaeogeography, Palaeoclimatology, Palaeoecology, 1996
The comparative taphonomy of reef coral life and death assemblages makes an important contributio... more The comparative taphonomy of reef coral life and death assemblages makes an important contribution in estimating bias in the taxonomic composition of fossil reef ecosystems. In Madang Lagoon, Papua New Guinea, the taxonomic composition of reef coral death assemblages shows varying degrees of congruence with adjacent life assemblages in fringing reefs. The original composition of coral communities from low energy reef crest sites appears to be more faithfully represented by their correspondent death assemblages than do those from high-energy reef crest sites where mixing of populations obscures the original coral composition. Coral death assemblages from low energy reef crest habitats may represent autochthonous deposits retaining some of the original community structure, whereas those from high energy reef crest habitats may represent detrital deposits retaining little of their original ecological information. In addition, coral zonation patterns appear to be better preserved at broad than local spatial scales. Species richness, Shannon-Wiener index of diversity and evenness of life and death assemblages were constant between sites and depths in Madang Lagoon. For all three parameters, however, diversity of reef coral death assemblages is significantly less than that of the corresponding life assemblages. This may be due to the unique life history attributes of reef corals. The great longevity of many reef corals may exceed the amount of time needed to degrade their skeletons. Alternatively, only a subset of the life assemblage is being selectively incorporated into the death assemblage. Published measures of fidelity for non-reef marine environments are different from those found in the reefs of Madang Lagoon. In Madang Lagoon reef corals, many live taxa are not found dead, but most taxa in the death assemblage are found alive. The situation is reversed in shelly faunas from non-reef open marine, coastal and intertidal settings: most live taxa are found dead and few taxa in the death assemblage are found alive. As with the diversity results, this probably has to do with the unique life history of reef corals and/or selective preservation of a subset of taxa in the death assemblage. It may be, however, that the present study is not directly comparable to the other marine studies because (1) corals may undergo very different taphonomic processes from both reef and non-reef molluscs; and (2) the sampling regime of the present study, in targeting within-and between-habitat variability in preservation of taxonomic composition and diversity, may be different from previous studies. The community ecology approach utilized in the present comparative taphonomic study was sufficient to capture the high variability inherent in marine life and death assemblages.
Sixteen years of old-field succession and reestablishment of a bottomland hardwood forest in the Lower Mississippi Alluvial Valley
Wetlands, 2002
Restoration Ecology, 2008
Dispersal limitation can retard natural establishment of desirable species on restoration sites, ... more Dispersal limitation can retard natural establishment of desirable species on restoration sites, especially where landscapes are fragmented, but dispersal limitation is assumed to become less critical with time as early colonists become reproductively mature. Distribution patterns of recruiting trees in a 20‐year‐old passively restored bottomland in northeast Louisiana suggested persistent dispersal limitation in some bottomland hardwood species and influence of dense shrub patches on colonization. To test these hypotheses, we measured seed rain as a function of distance to seed source and association with shrub cover. Seed rain of the wind‐dispersed Fraxinus pennsylvanica was highest near the forest edge, except where mature recruits occurred. Although shrub presence did not influence dispersal of F. pennsylvanica, its negative influence on probability of occurrence in the sapling layer suggests that shrub cover may limit its regeneration. The bird‐dispersed Crataegus viridis and I...
Canadian Journal of Forest Research, 1999
Disturbance patterns and species composition in the seedling and canopy layers were examined acro... more Disturbance patterns and species composition in the seedling and canopy layers were examined across the range of post-hurricane damage in an old-growth bottomland hardwood forest. Canopy coverage, tip-up number and area, snags, and coarse woody debris were quantified in plots along randomly oriented transects established in bottomland hardwood stands and mixed Pinus taeda L. -bottomland hardwood stands. Wilcoxon rank sum tests of these individual disturbance features indicated greater disturbance in plots containing the early successional species, Pinus taeda, than in mixed bottomland plots without it. Principal components analysis (PCA) using these features illustrated much overlap between the two assemblages and suggested a continuum of canopy and soil disturbance conditions from windthrows along axis I and a continuum of canopy disturbance due to snag formation along axis II. Woody seedlings and trees were inventoried in 30 plots spanning the range of disturbance. Seedling species richness exhibited a rank order increase along axis I. Floristic trends in both seedling and tree layers were significantly correlated with disturbance represented by PCA axis I scores. Removal from the canopy and lack of successful recruitment of Pinus taeda, a former canopy dominant, suggest that the hurricane has shifted this old-growth floodplain forest to a different successional state. Résumé : Les patrons de perturbation et la composition spécifique des strates des semis et de la canopée ont été examinés pour toute la gamme de dommages survenus après le passage d'un ouragan dans une vieille forêt feuillue des basses terres. Le recouvrement de la canopée, le nombre et la surface des arbres renversés, les chicots et les débris ligneux grossiers ont été quantifiés dans des places échantillons le long de transects orientés au hasard, établis dans des peuplements feuillus des basses terres et dans des peuplements mixtes où le Pinus taeda L. était mélangé avec les feuillus des basses terres. Les tests de classement de Wilcoxon effectués sur les caractéristiques de ces perturbations individuelles indiquaient une plus grande perturbation dans les places échantillons où était présente l'espèce pionnière Pinus taeda que dans les places échantillons en peuplements mixtes des basses terres qui n'en contenaient pas. L'analyse en composantes principales effectuée sur ces caractéristiques a montré qu'il y avait beaucoup de chevauchement entre les deux ensembles, suggérant l'existence, le long de l'axe I, d'un continuum dans les conditions de perturbation de la canopée et du sol, dû aux chablis et, le long de l'axe II, d'un continuum dans les perturbations de la canopée, dû à la formation de chicots. Les semis des espèces ligneuses et les arbres ont été inventoriés dans 30 places échantillons couvrant toute la gamme des perturbations. La richesse en espèces des semis montrait une augmentation dans l'ordre de classsement le long de l'axe I. Des tendances floristiques dans les deux strates, celle des semis et celle des arbres, ont été corrélées significativement avec la perturbation représentée par les résultats de l'axe I de l'analyse en composantes principales. La disparition du Pinus taeda de la canopée, jadis dominant, et l'absence de recrutement suggèrent que l'ouragan a fait glisser cette vieille forêt de la plaine inondable vers un stade de succession différent. [Traduit par la rédaction] Battaglia et al. 156 Disturbances produce abiotic and biotic heterogeneity that influences regeneration, species coexistence, and community structure of forests . Internal heterogeneity of canopy gaps can have a profound effect on seedling distribution patterns , and many kinds of within-gap microsites have been related to nonrandom distribution of seedlings (Collins and Pickett 1982;. Pit and mound topography, for example, created by uprooting of trees (Stephens 1956) affects local moisture
Correlations between sea surface temperature in eastern equatorial Pacific and rain days over China in summer
Advances in Atmospheric Sciences, 1990
Sea-surface temperature (SST) in the eastern, equatorial Pacific and rain days over China in summ... more Sea-surface temperature (SST) in the eastern, equatorial Pacific and rain days over China in summer are analysed using correlation moments that is proposed by author and principal component analysis(PCA). Occurrences of the strong rain-day anomalies over China are associated with extreme SSTs in some years. Areas significantly affected by the phenomena include North and Northeast China.
Wetlands, 2013
Ecosystem management practices that modify the major drivers and stressors of an ecosystem often ... more Ecosystem management practices that modify the major drivers and stressors of an ecosystem often lead to changes in plant community composition. This paper examines how closely the trajectory of vegetation change in seasonally-flooded wetlands tracks management-induced alterations in hydrology and soil characteristics. We used trajectory analysis, a multivariate method designed to test hypotheses about rates and directions of community change, to examine vegetation shifts in response to changes in water management practices within the Taylor Slough basin of Everglades National Park. We summarized vegetation data by non-metric multidimensional scaling ordination, and examined the time trajectory of each site along environmental vectors representing hydrology and soil phosphorus gradients. In the Taylor Slough basin, vegetation change trajectories closely followed the hydrologic changes caused by the operation of water pumps and detention ponds adjacent to the canals. We also observed a shift in vegetation composition along a vector of increasing soil phosphorus, which suggests the need for implementing measures to avoid Penrichment in southern Everglades marl prairies. This study indicates that shifts in vegetation composition in response to changes in hydrologic conditions and associated parameters may be detected through trajectory analysis, thereby providing feedback for adaptive management of wetland ecosystems.
IAVS Bulletin
Heinrich E. Weber 1995 putting brambles collected during a field trip in the herbarium press
2018 IAVS Symposium: Bozeman, Montana, USA
IAVS Bulletin, 2017
Evaluating the Success of Bottomland Forest Restoration In the Upper Mississippi Valley
F1000Research, 2014
Civil Engineering Studies, Illinois Center for Transportation Series, 2014
Seed variety performance data for establishing temporary vegetative cover was collected at four I... more Seed variety performance data for establishing temporary vegetative cover was collected at four Illinois locations at four planting seasons. Current Illinois Department of Transportation (IDOT) standard specifications call for a mixture of perennial rye and spring oats for temporary vegetative cover, with no variation for time of year or site conditions. That mixture has demonstrated some success; however, for every location and time of year, this study identified at least one seed variety that demonstrated performance superior to the specified mix. Temporary seeding specifications currently employed by nearby states were reviewed and compared with Illinois’ specifications. In addition to seed variety, the effectiveness of seed bed preparation using a power rake and the effectiveness of straw-mat and loose wheat-straw mulching methods were investigated. Based on the observed results, the research team has proposed modifying temporary seeding recommendations to reflect seeding date a...
IAVS annual reports 2020
IAVS Bulletin, 2021
IAVS Bulletin, 2019
Taiwan's cloud forest dominated by Fagus hayatae (Lalashan, 2017, above) and Chamaecyparis obtusa... more Taiwan's cloud forest dominated by Fagus hayatae (Lalashan, 2017, above) and Chamaecyparis obtusa var. formosana, covered by epiphytes (Smangus, 2009, below).
IAVS Bulletin, 2019
Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at S... more Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at Story Mansion, a historic home in Bozeman), a music jam and social on the evening of Tuesday, 24 July (held at Eagles Club in downtown Bozeman), and the symposium dinner on the evening of Thursday, 26 July (held at Deer Park Chalet, Bridger Bowl). During the closing ceremony, on the afternoon of Friday, 27 July, Dave Roberts presented a special award to Robert Pfister, Research Professor Emeritus in Forest Ecology, University of Montana, in recognition of his major contributions to the vegetation ecology of the region. The co-organizers express their gratitude to the many people who helped to make the symposium a success. These include the other members of the organizing committee (Steve Cooper and Kent Houston), the Scientific Committee (
IAVS Bulletin, 2019
Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at S... more Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at Story Mansion, a historic home in Bozeman), a music jam and social on the evening of Tuesday, 24 July (held at Eagles Club in downtown Bozeman), and the symposium dinner on the evening of Thursday, 26 July (held at Deer Park Chalet, Bridger Bowl). During the closing ceremony, on the afternoon of Friday, 27 July, Dave Roberts presented a special award to Robert Pfister, Research Professor Emeritus in Forest Ecology, University of Montana, in recognition of his major contributions to the vegetation ecology of the region. The co-organizers express their gratitude to the many people who helped to make the symposium a success. These include the other members of the organizing committee (Steve Cooper and Kent Houston), the Scientific Committee (
IAVS Bulletin, 2017
The IAVS Annual Symposium in Palermo is over and we are full of various experiences and beautiful... more The IAVS Annual Symposium in Palermo is over and we are full of various experiences and beautiful memories of all the sunny days, encounters, smileys, debates, lectures, flowers, mountains, landscapes, monuments, foods, drinks, songs, ... Some of them are reflected in this Bulletin issue, some others will be shared in the next issues. Many thanks to Riccardo Guarino and the local team of organizers for their perfect job and extraordinary comfort and hospitability during the Symposium!
IAVS Bulletin, 2020
When so many of us met in Bremen last July, I don't think we ever would have imagined the world s... more When so many of us met in Bremen last July, I don't think we ever would have imagined the world situation as it is today and that, among other impacts, it would have led us to cancel our annual symposium. This was a sad decision as for many of us IAVS is our scientific home and this event is a high point of our year. However, as events have transpired since that decision, I think it is clear to everyone that it was the only option. Now we need to think towards the future and how best to keep our linkages in IAVS strong until we can meet again. Our journals -Journal of Vegetation Science and Applied Vegetation Science continue to publish the results of high quality research and our recently launched journal Vegetation Classification and Survey provides new opportunities. You can subscribe to Contents Alerts for any of these journals by visiting the journal websites and following the links. You can keep up with the most recent news related to the journals by viewing and subscribing to the Vegetation Science Blog (). IAVS has numerous Working Groups and Regional Sections. These provide another way or remaining involved with IAVS through more focused or regional activities. Follow iavs.org/Working-Groups/Join-a-Group to learn more about these groups and how you can join, if you haven't already. If the situation with the pandemic improves, there may even be opportunities for smaller botanical excursions or regional meetings that could be promoted through these groups. Happier times in Bremen, July 2019 (© J. Dengler). Mountain pastures of Poiana Călineasa are situated above the Ghetari village in the Apuseni Carpathians, Romania. Wherever you look, time forgot this landscape in the end of the 19th century. July 2019. This colourful meadow on a steep north-facing slope in Marisel (Apuseni Carpathians, Romania) has never been ploughed. For the last five decades, this plot has had a stable management: it is annually mown in August, grazed by cows for one week in May and then again in autumn (September-October), manured in winter, cleared of shrub and trees in spring, and cleaned from Veratrum album by picking when necessary. August 2019.
Northeastern Naturalist, 2018
Since the 1950s, anthropogenic activity has caused the loss of millions of hectares of bottomland... more Since the 1950s, anthropogenic activity has caused the loss of millions of hectares of bottomland hardwood forest in the Upper Mississippi River Valley, causing population declines in bird populations. Restoration of these forest stands has been ongoing for the past 2 decades. We assessed bird species presence on sites in the Upper Mississippi River Valley to quantify diversity and relate presence to habitat conditions and sites' age since restoration. We observed higher mean diversities at mature bottomland-forest sites during the spring and autumn, but nested ANOVAs indicated no significant differences among restoration-age categories during spring. During the autumn, the 15-23-y and the mature bottomland-forest categories were significantly different from the <7-y category. Predictive habitat models differed among species, but presence of forest-dwelling birds was positively related to forested conditions, such as tree height and tree density. Overall, our analyses show that a variety of birds use these sites, and we suggest further exploration of how assemblages may change in future surveys.
Tree Physiology, 2005
Oleoresin flow is an important factor in the resistance of pines to attack by southern pine beetl... more Oleoresin flow is an important factor in the resistance of pines to attack by southern pine beetle, Dendroctonus frontalis Zimm., and its associated fungi. Abiotic factors, such as nutrient supply and water relations, have the potential to modify this plant-insect-fungus interaction; however, little is known of the effects of inoculation with beetle-associated fungi on oleoresin flow. We observed that constitutive and induced resin yield in loblolly pine, Pinus taeda L., were affected by either fungal inoculation (with the southern pine beetle-associated fungus Ophiostoma minus (Hedgcock) H. & P. Sydow) or silvicultural treatment. The effects of mass wounding (400 wounds m -2 ) and mass wounding and inoculation with O. minus were assessed by comparison with untreated (control) trees. The treatments were applied to trees in a 2 × 2 factorial combination of fertilizer and irrigation treatments. Fertilization did not significantly affect constitutive resin yield. Even as long as 105 days post-treatment, however, mass-inoculated trees produced higher induced resin yields than control or wounded-only trees, indicating a localized induced response to fungal inoculation. We noted no systemic induction of host defenses against fungal colonization. Although beetles attacking previously attacked trees face a greater resinous response from their host than beetles attacking trees that had not been previously attacked, the effect of an earlier attack may not last more than one flight season. Despite mass inoculations, O. minus did not kill the host trees, suggesting that this fungus is not a virulent plant pathogen.
Theory and models in vegetation science, 1987
Simulated vegetation data were used to assess the relative robustness of ordination techniques to... more Simulated vegetation data were used to assess the relative robustness of ordination techniques to variations in the model of community variation in relation to environment. The methods compared were local nonmetric multidimensional scaling (LNMDS), detrended correspondence analysis (DCA), Gaussian ordination (GO), principal components analysis (PCA) and principal coordinates analysis (PCoA). Both LNMDS and PCoA were applied to a matrix of Bray-Curtis coefficients. The results clearly demonstrated the ineffectiveness of the linear techniques (PCA, PCoA), due to curvilinear distortion. Gaussian ordination proved very sensitive to noise and was not robust to marked departures from a symmetric, unimodal response model. The currently popular method of DCA displayed a lack of robustness to variations in the response model and the sampling pattern. Furthermore, DCA ordinations of two-dimensional models often exhibited marked distortions, even when response surfaces were unimodal and symmetric. LNMDS is recommended as a robust technique for indirect gradient analysis, which deserves more widespread use by community ecologists.
Palaeogeography, Palaeoclimatology, Palaeoecology, 1996
The comparative taphonomy of reef coral life and death assemblages makes an important contributio... more The comparative taphonomy of reef coral life and death assemblages makes an important contribution in estimating bias in the taxonomic composition of fossil reef ecosystems. In Madang Lagoon, Papua New Guinea, the taxonomic composition of reef coral death assemblages shows varying degrees of congruence with adjacent life assemblages in fringing reefs. The original composition of coral communities from low energy reef crest sites appears to be more faithfully represented by their correspondent death assemblages than do those from high-energy reef crest sites where mixing of populations obscures the original coral composition. Coral death assemblages from low energy reef crest habitats may represent autochthonous deposits retaining some of the original community structure, whereas those from high energy reef crest habitats may represent detrital deposits retaining little of their original ecological information. In addition, coral zonation patterns appear to be better preserved at broad than local spatial scales. Species richness, Shannon-Wiener index of diversity and evenness of life and death assemblages were constant between sites and depths in Madang Lagoon. For all three parameters, however, diversity of reef coral death assemblages is significantly less than that of the corresponding life assemblages. This may be due to the unique life history attributes of reef corals. The great longevity of many reef corals may exceed the amount of time needed to degrade their skeletons. Alternatively, only a subset of the life assemblage is being selectively incorporated into the death assemblage. Published measures of fidelity for non-reef marine environments are different from those found in the reefs of Madang Lagoon. In Madang Lagoon reef corals, many live taxa are not found dead, but most taxa in the death assemblage are found alive. The situation is reversed in shelly faunas from non-reef open marine, coastal and intertidal settings: most live taxa are found dead and few taxa in the death assemblage are found alive. As with the diversity results, this probably has to do with the unique life history of reef corals and/or selective preservation of a subset of taxa in the death assemblage. It may be, however, that the present study is not directly comparable to the other marine studies because (1) corals may undergo very different taphonomic processes from both reef and non-reef molluscs; and (2) the sampling regime of the present study, in targeting within-and between-habitat variability in preservation of taxonomic composition and diversity, may be different from previous studies. The community ecology approach utilized in the present comparative taphonomic study was sufficient to capture the high variability inherent in marine life and death assemblages.
Sixteen years of old-field succession and reestablishment of a bottomland hardwood forest in the Lower Mississippi Alluvial Valley
Wetlands, 2002
Restoration Ecology, 2008
Dispersal limitation can retard natural establishment of desirable species on restoration sites, ... more Dispersal limitation can retard natural establishment of desirable species on restoration sites, especially where landscapes are fragmented, but dispersal limitation is assumed to become less critical with time as early colonists become reproductively mature. Distribution patterns of recruiting trees in a 20‐year‐old passively restored bottomland in northeast Louisiana suggested persistent dispersal limitation in some bottomland hardwood species and influence of dense shrub patches on colonization. To test these hypotheses, we measured seed rain as a function of distance to seed source and association with shrub cover. Seed rain of the wind‐dispersed Fraxinus pennsylvanica was highest near the forest edge, except where mature recruits occurred. Although shrub presence did not influence dispersal of F. pennsylvanica, its negative influence on probability of occurrence in the sapling layer suggests that shrub cover may limit its regeneration. The bird‐dispersed Crataegus viridis and I...
Canadian Journal of Forest Research, 1999
Disturbance patterns and species composition in the seedling and canopy layers were examined acro... more Disturbance patterns and species composition in the seedling and canopy layers were examined across the range of post-hurricane damage in an old-growth bottomland hardwood forest. Canopy coverage, tip-up number and area, snags, and coarse woody debris were quantified in plots along randomly oriented transects established in bottomland hardwood stands and mixed Pinus taeda L. -bottomland hardwood stands. Wilcoxon rank sum tests of these individual disturbance features indicated greater disturbance in plots containing the early successional species, Pinus taeda, than in mixed bottomland plots without it. Principal components analysis (PCA) using these features illustrated much overlap between the two assemblages and suggested a continuum of canopy and soil disturbance conditions from windthrows along axis I and a continuum of canopy disturbance due to snag formation along axis II. Woody seedlings and trees were inventoried in 30 plots spanning the range of disturbance. Seedling species richness exhibited a rank order increase along axis I. Floristic trends in both seedling and tree layers were significantly correlated with disturbance represented by PCA axis I scores. Removal from the canopy and lack of successful recruitment of Pinus taeda, a former canopy dominant, suggest that the hurricane has shifted this old-growth floodplain forest to a different successional state. Résumé : Les patrons de perturbation et la composition spécifique des strates des semis et de la canopée ont été examinés pour toute la gamme de dommages survenus après le passage d'un ouragan dans une vieille forêt feuillue des basses terres. Le recouvrement de la canopée, le nombre et la surface des arbres renversés, les chicots et les débris ligneux grossiers ont été quantifiés dans des places échantillons le long de transects orientés au hasard, établis dans des peuplements feuillus des basses terres et dans des peuplements mixtes où le Pinus taeda L. était mélangé avec les feuillus des basses terres. Les tests de classement de Wilcoxon effectués sur les caractéristiques de ces perturbations individuelles indiquaient une plus grande perturbation dans les places échantillons où était présente l'espèce pionnière Pinus taeda que dans les places échantillons en peuplements mixtes des basses terres qui n'en contenaient pas. L'analyse en composantes principales effectuée sur ces caractéristiques a montré qu'il y avait beaucoup de chevauchement entre les deux ensembles, suggérant l'existence, le long de l'axe I, d'un continuum dans les conditions de perturbation de la canopée et du sol, dû aux chablis et, le long de l'axe II, d'un continuum dans les perturbations de la canopée, dû à la formation de chicots. Les semis des espèces ligneuses et les arbres ont été inventoriés dans 30 places échantillons couvrant toute la gamme des perturbations. La richesse en espèces des semis montrait une augmentation dans l'ordre de classsement le long de l'axe I. Des tendances floristiques dans les deux strates, celle des semis et celle des arbres, ont été corrélées significativement avec la perturbation représentée par les résultats de l'axe I de l'analyse en composantes principales. La disparition du Pinus taeda de la canopée, jadis dominant, et l'absence de recrutement suggèrent que l'ouragan a fait glisser cette vieille forêt de la plaine inondable vers un stade de succession différent. [Traduit par la rédaction] Battaglia et al. 156 Disturbances produce abiotic and biotic heterogeneity that influences regeneration, species coexistence, and community structure of forests . Internal heterogeneity of canopy gaps can have a profound effect on seedling distribution patterns , and many kinds of within-gap microsites have been related to nonrandom distribution of seedlings (Collins and Pickett 1982;. Pit and mound topography, for example, created by uprooting of trees (Stephens 1956) affects local moisture
Correlations between sea surface temperature in eastern equatorial Pacific and rain days over China in summer
Advances in Atmospheric Sciences, 1990
Sea-surface temperature (SST) in the eastern, equatorial Pacific and rain days over China in summ... more Sea-surface temperature (SST) in the eastern, equatorial Pacific and rain days over China in summer are analysed using correlation moments that is proposed by author and principal component analysis(PCA). Occurrences of the strong rain-day anomalies over China are associated with extreme SSTs in some years. Areas significantly affected by the phenomena include North and Northeast China.
Wetlands, 2013
Ecosystem management practices that modify the major drivers and stressors of an ecosystem often ... more Ecosystem management practices that modify the major drivers and stressors of an ecosystem often lead to changes in plant community composition. This paper examines how closely the trajectory of vegetation change in seasonally-flooded wetlands tracks management-induced alterations in hydrology and soil characteristics. We used trajectory analysis, a multivariate method designed to test hypotheses about rates and directions of community change, to examine vegetation shifts in response to changes in water management practices within the Taylor Slough basin of Everglades National Park. We summarized vegetation data by non-metric multidimensional scaling ordination, and examined the time trajectory of each site along environmental vectors representing hydrology and soil phosphorus gradients. In the Taylor Slough basin, vegetation change trajectories closely followed the hydrologic changes caused by the operation of water pumps and detention ponds adjacent to the canals. We also observed a shift in vegetation composition along a vector of increasing soil phosphorus, which suggests the need for implementing measures to avoid Penrichment in southern Everglades marl prairies. This study indicates that shifts in vegetation composition in response to changes in hydrologic conditions and associated parameters may be detected through trajectory analysis, thereby providing feedback for adaptive management of wetland ecosystems.
IAVS Bulletin
Heinrich E. Weber 1995 putting brambles collected during a field trip in the herbarium press
2018 IAVS Symposium: Bozeman, Montana, USA
IAVS Bulletin, 2017
Evaluating the Success of Bottomland Forest Restoration In the Upper Mississippi Valley
F1000Research, 2014
Civil Engineering Studies, Illinois Center for Transportation Series, 2014
Seed variety performance data for establishing temporary vegetative cover was collected at four I... more Seed variety performance data for establishing temporary vegetative cover was collected at four Illinois locations at four planting seasons. Current Illinois Department of Transportation (IDOT) standard specifications call for a mixture of perennial rye and spring oats for temporary vegetative cover, with no variation for time of year or site conditions. That mixture has demonstrated some success; however, for every location and time of year, this study identified at least one seed variety that demonstrated performance superior to the specified mix. Temporary seeding specifications currently employed by nearby states were reviewed and compared with Illinois’ specifications. In addition to seed variety, the effectiveness of seed bed preparation using a power rake and the effectiveness of straw-mat and loose wheat-straw mulching methods were investigated. Based on the observed results, the research team has proposed modifying temporary seeding recommendations to reflect seeding date a...
IAVS annual reports 2020
IAVS Bulletin, 2021
IAVS Bulletin, 2019
Taiwan's cloud forest dominated by Fagus hayatae (Lalashan, 2017, above) and Chamaecyparis obtusa... more Taiwan's cloud forest dominated by Fagus hayatae (Lalashan, 2017, above) and Chamaecyparis obtusa var. formosana, covered by epiphytes (Smangus, 2009, below).
IAVS Bulletin, 2019
Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at S... more Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at Story Mansion, a historic home in Bozeman), a music jam and social on the evening of Tuesday, 24 July (held at Eagles Club in downtown Bozeman), and the symposium dinner on the evening of Thursday, 26 July (held at Deer Park Chalet, Bridger Bowl). During the closing ceremony, on the afternoon of Friday, 27 July, Dave Roberts presented a special award to Robert Pfister, Research Professor Emeritus in Forest Ecology, University of Montana, in recognition of his major contributions to the vegetation ecology of the region. The co-organizers express their gratitude to the many people who helped to make the symposium a success. These include the other members of the organizing committee (Steve Cooper and Kent Houston), the Scientific Committee (
IAVS Bulletin, 2019
Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at S... more Social events included a welcome reception and mixer on the evening of Sunday, 22 July (held at Story Mansion, a historic home in Bozeman), a music jam and social on the evening of Tuesday, 24 July (held at Eagles Club in downtown Bozeman), and the symposium dinner on the evening of Thursday, 26 July (held at Deer Park Chalet, Bridger Bowl). During the closing ceremony, on the afternoon of Friday, 27 July, Dave Roberts presented a special award to Robert Pfister, Research Professor Emeritus in Forest Ecology, University of Montana, in recognition of his major contributions to the vegetation ecology of the region. The co-organizers express their gratitude to the many people who helped to make the symposium a success. These include the other members of the organizing committee (Steve Cooper and Kent Houston), the Scientific Committee (
IAVS Bulletin, 2017
The IAVS Annual Symposium in Palermo is over and we are full of various experiences and beautiful... more The IAVS Annual Symposium in Palermo is over and we are full of various experiences and beautiful memories of all the sunny days, encounters, smileys, debates, lectures, flowers, mountains, landscapes, monuments, foods, drinks, songs, ... Some of them are reflected in this Bulletin issue, some others will be shared in the next issues. Many thanks to Riccardo Guarino and the local team of organizers for their perfect job and extraordinary comfort and hospitability during the Symposium!