Erin Riordan - Academia.edu (original) (raw)
Papers by Erin Riordan
PeerJ
The Cyclanthaceae comprise a relatively small family of about 230 species and 12 genera in the Pa... more The Cyclanthaceae comprise a relatively small family of about 230 species and 12 genera in the Pandanales that is widespread in wet Neotropical forests. The great majority of species can be divided into three growth forms (understory herbs, epiphytes, and root-climbing hemiepiphytes) that share functional traits with similar growth forms present in the Araceae, a member of the Alismatales and not closely related. Our objectives were first to characterize the diversity, functional growth forms, and ecological traits of Cyclanthaceae at the La Selva Biological Station. Specific functional leaf and canopy traits of terrestrial herbs and epiphytes are very similar and associated with ecological success in both families. We further examined the functional traits of root-climbing hemiepiphytes, a specialized growth form that links the two families but rare in other families and argue that their specialized functional traits allow them to be considered as a distinct functional growth form....
<p>Number of herbarium record localities (N) and overall model performance measured as the ... more <p>Number of herbarium record localities (N) and overall model performance measured as the mean test area under the receiver operating characteristic curve (AUC) score (min–max). Taxonomy follows the second edition <i>The Jepson Manual: Vascular Plants of California</i><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086487#pone.0086487-Baldwin1" target="_blank">[48]</a>.</p
<p>Projected 21<sup>st</sup> century change in anthropogenic land use (2000–205... more <p>Projected 21<sup>st</sup> century change in anthropogenic land use (2000–2050, 2050–2080, 2000–2080) under the IPCC-SRES A1B scenario. Anthropogenic uses include developed areas, cultivated crops, hay/pasture, mining, and mechanically disturbed (logged) land. Land use-land cover maps were resampled to 1 km resolution from the USGS LandCarbon 250 m resolution land use-land cover maps for the continental United States <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086487#pone.0086487-Sleeter1" target="_blank">[9]</a>.</p
Appendix 5 contains habitat suitability maps for the 180 sensitive plant species modeled in the R... more Appendix 5 contains habitat suitability maps for the 180 sensitive plant species modeled in the Riordan and Rundel (2019) report entitled "Evaluating the Future Role of the University of California Natural Reserve System for Sensitive Plant Protection under Climate Change". Occurrences, baseline (1971–2000) suitable habitat, future (2070–2099) suitable habitat, and future suitable habitat change are provided for each species. Future suitable habitat shows the spatial agreement in predicted future habitat across the five future climate scenarios. Future habitat change shows the consensus where there is spatial agreement under least three climates scenarios for stable habitat, habitat loss, and habitat gain. Dotted line indicates 100 km limit for the full dispersal scenario. High resolution maps for all species are in a zipped folder. [Appendix5. zip]. See Riordan and Rundel (2019) for further details on modeling methods and interpretation of suitable habitat maps.
Appendix 1 from Riordan and Rundel (2019) report entitled "Evaluating the Future Role of the... more Appendix 1 from Riordan and Rundel (2019) report entitled "Evaluating the Future Role of the University of California Natural Reserve System for Sensitive Plant Protection under Climate Change" provides a list of sensitive vascular plant taxa recorded on University of California Natural Reserve System reserves. Status and taxonomy follow the California Native Plant Society (CNPS) Inventory of Rare and Endangered Plants (as of September 30, 2018). Data was compiled from reserve species lists, floras, and occurrence data downloaded in 2013-2014 from the Consortium of California Herbaria (CCH), California Natural Diversity Database (CNDDB), and CalPhotos. Please note that this list is incomplete and may contain errors stemming from mis-identifications, taxonomic uncertainties, or location uncertainties. Occurrences do not include observations made or digitized after 2013. Sensitive plant status for some taxa may change with periodic revisions to the CNPS rare plant inventory....
Data generated at Victoria Sork Lab, University of California Los Angeles (UCLA). This file conta... more Data generated at Victoria Sork Lab, University of California Los Angeles (UCLA). This file contains the genotypes for 9 microsatellite loci and 128 individuals collected in 20 populations of Engelmann oak (Quercus engelmannii
Understanding how specific environmental factors shape gene flow while disentangling their import... more Understanding how specific environmental factors shape gene flow while disentangling their importance relative to the effects of geographical isolation is a major question in evolutionary biology and a specific goal of landscape genetics. Here, we combine information from nuclear microsatellite markers and ecological niche modelling to study the association between climate and spatial genetic structure and variability in Engelmann oak (Quercus engelmannii), a wind-pollinated species with high potential for gene flow. We first test whether genetic diversity is associated with climatic niche suitability and stability since the Last Glacial Maximum (LGM). Second, we use causal modelling to analyze the potential influence of climatic factors (current and LGM niche suitability) and altitude in the observed patterns of genetic structure. We found that genetic diversity is negatively associated with local climatic stability since the LGM, which may be due to higher immigration rates in unstable patches during favourable climatic periods and/or temporally varying selection. Analyses of spatial genetic structure revealed the presence of three main genetic clusters, a pattern that is mainly driven by two highly differentiated populations located in the northern edge of the species distribution range. After controlling for geographic distance, causal modelling analyses showed that genetic relatedness decreases with the environmental divergence among sampling sites estimated as altitude and current and LGM niche suitability. Natural selection against non-local genotypes and/or asynchrony in reproductive phenology may explain this pattern. Overall, this study suggests that local environmental conditions can shape patterns of genetic structure and variability even in species with high potential for gene flow and relatively small distribution ranges
Appendix 4 provides detailed information on species distribution model (SDM) performance and suit... more Appendix 4 provides detailed information on species distribution model (SDM) performance and suitable habitat predictions for rare plants evaluated in the Riordan and Rundel (2019) report entitled: "Evaluating the Future Role of the University of California Natural Reserve System for Sensitive Plant Protection under Climate Change." See Riordan and Rundel (2019) for further details on species selection, modeling methodology, and results.
Influence of climatic niche suitability and geographical overlap on hybridization patterns among ... more Influence of climatic niche suitability and geographical overlap on hybridization patterns among southern
The taxonomy of oaks (Quercus) is always a challenge because many species exhibit variable phenot... more The taxonomy of oaks (Quercus) is always a challenge because many species exhibit variable phenotypes that overlap with other species. The scrub White Oaks of California are no exception. In California, Quercus section Quercus (i.e., White Oaks) includes six species of scrub oaks plus four tree oak species. Field identification utilizes leaf traits and acorns, when available, as well as geographic location, but often botanists – with the exception of specialists – are not confident of their assignments. Complicating our understanding of scrub oaks further is the historical and ongoing introgression among taxa. Fortunately, new research using nuclear microsatellite genetic markers and RADseq-based sequences are clarifying their evolutionary relationships. Based on these genetic markers, we describe the phylogenetic relationships among the California scrub and tree White Oaks. Given the impact of hybridization in oaks, we then present a specific example involving three Southern Califo...
PeerJ, 2020
Broad-leaved monocot herbs are widespread and dominant components of the shaded understories of w... more Broad-leaved monocot herbs are widespread and dominant components of the shaded understories of wet neotropical forests. These understory habitats are characterized by light limitation and a constant threat of falling branches. Many shaded understory herb species have close relatives that occupy forest edges and gaps, where light availability is higher and defoliation threat is lower, creating an opportunity for comparative analysis of functional traits in order to better understand the evolutionary adaptations associated with this habitat transition. We documented ecological, morphological and ecophysiological traits of multiple herb species in six monocot families from each of these two habitats in the wet tropical rainforest at the La Selva Biological Station, Costa Rica. We found that a mixture of phylogenetic canalization and ecological selection for specific habitats helped explain patterns of functional traits. Understory herbs were significantly shorter and had smaller leave...
Nature Climate Change, 2018
PeerJ
The Cyclanthaceae comprise a relatively small family of about 230 species and 12 genera in the Pa... more The Cyclanthaceae comprise a relatively small family of about 230 species and 12 genera in the Pandanales that is widespread in wet Neotropical forests. The great majority of species can be divided into three growth forms (understory herbs, epiphytes, and root-climbing hemiepiphytes) that share functional traits with similar growth forms present in the Araceae, a member of the Alismatales and not closely related. Our objectives were first to characterize the diversity, functional growth forms, and ecological traits of Cyclanthaceae at the La Selva Biological Station. Specific functional leaf and canopy traits of terrestrial herbs and epiphytes are very similar and associated with ecological success in both families. We further examined the functional traits of root-climbing hemiepiphytes, a specialized growth form that links the two families but rare in other families and argue that their specialized functional traits allow them to be considered as a distinct functional growth form....
<p>Number of herbarium record localities (N) and overall model performance measured as the ... more <p>Number of herbarium record localities (N) and overall model performance measured as the mean test area under the receiver operating characteristic curve (AUC) score (min–max). Taxonomy follows the second edition <i>The Jepson Manual: Vascular Plants of California</i><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086487#pone.0086487-Baldwin1" target="_blank">[48]</a>.</p
<p>Projected 21<sup>st</sup> century change in anthropogenic land use (2000–205... more <p>Projected 21<sup>st</sup> century change in anthropogenic land use (2000–2050, 2050–2080, 2000–2080) under the IPCC-SRES A1B scenario. Anthropogenic uses include developed areas, cultivated crops, hay/pasture, mining, and mechanically disturbed (logged) land. Land use-land cover maps were resampled to 1 km resolution from the USGS LandCarbon 250 m resolution land use-land cover maps for the continental United States <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086487#pone.0086487-Sleeter1" target="_blank">[9]</a>.</p
Appendix 5 contains habitat suitability maps for the 180 sensitive plant species modeled in the R... more Appendix 5 contains habitat suitability maps for the 180 sensitive plant species modeled in the Riordan and Rundel (2019) report entitled "Evaluating the Future Role of the University of California Natural Reserve System for Sensitive Plant Protection under Climate Change". Occurrences, baseline (1971–2000) suitable habitat, future (2070–2099) suitable habitat, and future suitable habitat change are provided for each species. Future suitable habitat shows the spatial agreement in predicted future habitat across the five future climate scenarios. Future habitat change shows the consensus where there is spatial agreement under least three climates scenarios for stable habitat, habitat loss, and habitat gain. Dotted line indicates 100 km limit for the full dispersal scenario. High resolution maps for all species are in a zipped folder. [Appendix5. zip]. See Riordan and Rundel (2019) for further details on modeling methods and interpretation of suitable habitat maps.
Appendix 1 from Riordan and Rundel (2019) report entitled "Evaluating the Future Role of the... more Appendix 1 from Riordan and Rundel (2019) report entitled "Evaluating the Future Role of the University of California Natural Reserve System for Sensitive Plant Protection under Climate Change" provides a list of sensitive vascular plant taxa recorded on University of California Natural Reserve System reserves. Status and taxonomy follow the California Native Plant Society (CNPS) Inventory of Rare and Endangered Plants (as of September 30, 2018). Data was compiled from reserve species lists, floras, and occurrence data downloaded in 2013-2014 from the Consortium of California Herbaria (CCH), California Natural Diversity Database (CNDDB), and CalPhotos. Please note that this list is incomplete and may contain errors stemming from mis-identifications, taxonomic uncertainties, or location uncertainties. Occurrences do not include observations made or digitized after 2013. Sensitive plant status for some taxa may change with periodic revisions to the CNPS rare plant inventory....
Data generated at Victoria Sork Lab, University of California Los Angeles (UCLA). This file conta... more Data generated at Victoria Sork Lab, University of California Los Angeles (UCLA). This file contains the genotypes for 9 microsatellite loci and 128 individuals collected in 20 populations of Engelmann oak (Quercus engelmannii
Understanding how specific environmental factors shape gene flow while disentangling their import... more Understanding how specific environmental factors shape gene flow while disentangling their importance relative to the effects of geographical isolation is a major question in evolutionary biology and a specific goal of landscape genetics. Here, we combine information from nuclear microsatellite markers and ecological niche modelling to study the association between climate and spatial genetic structure and variability in Engelmann oak (Quercus engelmannii), a wind-pollinated species with high potential for gene flow. We first test whether genetic diversity is associated with climatic niche suitability and stability since the Last Glacial Maximum (LGM). Second, we use causal modelling to analyze the potential influence of climatic factors (current and LGM niche suitability) and altitude in the observed patterns of genetic structure. We found that genetic diversity is negatively associated with local climatic stability since the LGM, which may be due to higher immigration rates in unstable patches during favourable climatic periods and/or temporally varying selection. Analyses of spatial genetic structure revealed the presence of three main genetic clusters, a pattern that is mainly driven by two highly differentiated populations located in the northern edge of the species distribution range. After controlling for geographic distance, causal modelling analyses showed that genetic relatedness decreases with the environmental divergence among sampling sites estimated as altitude and current and LGM niche suitability. Natural selection against non-local genotypes and/or asynchrony in reproductive phenology may explain this pattern. Overall, this study suggests that local environmental conditions can shape patterns of genetic structure and variability even in species with high potential for gene flow and relatively small distribution ranges
Appendix 4 provides detailed information on species distribution model (SDM) performance and suit... more Appendix 4 provides detailed information on species distribution model (SDM) performance and suitable habitat predictions for rare plants evaluated in the Riordan and Rundel (2019) report entitled: "Evaluating the Future Role of the University of California Natural Reserve System for Sensitive Plant Protection under Climate Change." See Riordan and Rundel (2019) for further details on species selection, modeling methodology, and results.
Influence of climatic niche suitability and geographical overlap on hybridization patterns among ... more Influence of climatic niche suitability and geographical overlap on hybridization patterns among southern
The taxonomy of oaks (Quercus) is always a challenge because many species exhibit variable phenot... more The taxonomy of oaks (Quercus) is always a challenge because many species exhibit variable phenotypes that overlap with other species. The scrub White Oaks of California are no exception. In California, Quercus section Quercus (i.e., White Oaks) includes six species of scrub oaks plus four tree oak species. Field identification utilizes leaf traits and acorns, when available, as well as geographic location, but often botanists – with the exception of specialists – are not confident of their assignments. Complicating our understanding of scrub oaks further is the historical and ongoing introgression among taxa. Fortunately, new research using nuclear microsatellite genetic markers and RADseq-based sequences are clarifying their evolutionary relationships. Based on these genetic markers, we describe the phylogenetic relationships among the California scrub and tree White Oaks. Given the impact of hybridization in oaks, we then present a specific example involving three Southern Califo...
PeerJ, 2020
Broad-leaved monocot herbs are widespread and dominant components of the shaded understories of w... more Broad-leaved monocot herbs are widespread and dominant components of the shaded understories of wet neotropical forests. These understory habitats are characterized by light limitation and a constant threat of falling branches. Many shaded understory herb species have close relatives that occupy forest edges and gaps, where light availability is higher and defoliation threat is lower, creating an opportunity for comparative analysis of functional traits in order to better understand the evolutionary adaptations associated with this habitat transition. We documented ecological, morphological and ecophysiological traits of multiple herb species in six monocot families from each of these two habitats in the wet tropical rainforest at the La Selva Biological Station, Costa Rica. We found that a mixture of phylogenetic canalization and ecological selection for specific habitats helped explain patterns of functional traits. Understory herbs were significantly shorter and had smaller leave...
Nature Climate Change, 2018