Richard DODD - Academia.edu (original) (raw)

Papers by Richard DODD

Research paper thumbnail of Genetic signals of past demographic changes and the history of oak populations in California

Research paper thumbnail of Does stand density affect mating system and population genetic structure in coast live oak

Research paper thumbnail of Is variation in susceptibility to <i>Phytophthora ramorum</i> correlated with population genetic structure in coast live oak ( <i>Quercus agrifolia</i> )?

New Phytologist, Sep 2, 2004

Research paper thumbnail of Detecting the limits of northern and southern lineages of tanoak in northern California

Research paper thumbnail of Patterns of Fine-Scale Spatial Genetic Structure and Pollen Dispersal in Giant Sequoia (Sequoiadendron giganteum)

Research paper thumbnail of Calculation of Wood Density Variation From X-ray Densitometer Data

Wood and Fiber Science, 1988

Research paper thumbnail of Clonal Growth and Fine-Scale Genetic Structure in Tanoak (Notholithocarpus densiflorus: Fagaceae)

Journal of Heredity, Oct 29, 2012

Research paper thumbnail of Could Tanoak Mortality Affect Insect Biodiversity? Evidence For Insect Pollination in Tanoaks

Research paper thumbnail of Genetic Diversity of the Black Mangrove Avicennia germinans (L.) Stearn in Northwestern Mexico

Research paper thumbnail of Genetic hitch-hiking extends the range of coast live oak

Research paper thumbnail of Clonal Spread in Second Growth Stands of Coast Redwood, Sequoia sempervirens

Research paper thumbnail of Gene Flow Among Populations of Three California Evergreen Oaks

Research paper thumbnail of Ancestral seed zones and genetic mixture of tanoak

Research paper thumbnail of Genetic Structure ofNotholithocarpus densiflorus(Fagaceae) from the Species to the Local Scale: A Review of Our Knowledge for Conservation and Replanting

Research paper thumbnail of Salix Exigua Clonal Growth and Population Dynamics in Relation to Disturbance Regime Variation

Research paper thumbnail of Evidence for the role of synchronicity between host phenology and pathogen activity in the distribution of sudden oak death canker disease

New Phytologist, Jun 28, 2008

Research paper thumbnail of Variation in genetic structure and gene flow across the range of Sequoiadendron giganteum (giant sequoia)

During this century, climate warming and altered precipitation patterns will lead to habitat chan... more During this century, climate warming and altered precipitation patterns will lead to habitat changes that may be beneficial to some long-lived tree species and detrimental to others. Paleoendemics, with limited and disjunct distributions will face the greatest challenges, as migration rates will be too slow to keep pace with rapid environmental change and populations at the receding edges are eroded through mal-adaption. Giant sequoia (Sequoiadendron giganteum (Lindl.) Buchholz) is an iconic Sierra Nevada tree species with populations that tend to be small and highly fragmented (particularly in the northern range), making them especially vulnerable to environmental change. Maintenance of genetic variation is an important determinant of population persistence that, in part, depends on gene flow within and between populations. The research presented here describes: 1) the distribution of genetic diversity among population pairs distributed across the range of giant sequoia, and 2) the...

Research paper thumbnail of Life history traits predict demographic responses to global warming in Arctic marine mammals

The glacial-interglacial transitions during the Late Quaternary effected the thickness and extent... more The glacial-interglacial transitions during the Late Quaternary effected the thickness and extent of glaciers and ice sheets as well as sea level height and ocean circulation patterns. These environmental changes altered the ecological conditions of many species both at high and low latitudes, and hence were evolution-driving forces. Here, we asked whether the Late Quaternary changes in the marine environment induced cross-taxa responses to widespread climatic stressors or whether only species-specific response occurred. Additionally, we asked whether demographic dynamics of marine species, in this case, marine mammals, have distinctive genetic signatures. The different life history traits within marine mammal species provide a unique opportunity to address these questions. We employed genetic data to infer the demographic history of marine mammal species inhabiting the Arctic with contrasting habitats and/or life history traits. This included resident, ice obligate species (e.g., p...

Research paper thumbnail of Biodiversity within natural populations of Cupressus bakeri (Goosenest Mountain, California)

Ecologia mediterranea, 1990

Les feuilles, les cônes et les graines de 51 individus de Cupressus bakeri Jeps. ont été récoltés... more Les feuilles, les cônes et les graines de 51 individus de Cupressus bakeri Jeps. ont été récoltés dans 6 populations naturelles du versant NE et NW du Mont de Goosenest dans la chaîne montagneuse de Cascades en Californie. L’analyse multivariante effectuée sur les caractères biométriques a montré un degré élevé de différenciation entre les diverses populations, même géographiquement très proches. La population GN2 du versant NW est bien distincte des autres. La variation entre les populations GN1 et GN2, très voisines, dans des conditions écologiques similaires, est surprenante et nous suggérons qu’il s’agit d’une différenciation plutôt d’origine génétique. La différence morphologique observée entre les populations du versant NE (GN4, GN5, GN6) est due aux conditions écologiques : c’est une différenciation phénotypique. Ces dernières populations possèdent les caractéristiques de celles du Mont Siskiyou et cela nous a incités à penser que le Mont de Goosenest pourrait être en effet u...

Research paper thumbnail of Landscape Metrics and Conservation Status of Five Mangrove Wetlands in the Eastern Gulf of California Margin

Journal of Coastal Research, 2019

ABSTRACT Millán-Aguilar, O.; Nettel-Hernanz, A.; Hurtado-Oliva, M.Á.; Dodd, R.S.; Flores-Cárdenas... more ABSTRACT Millán-Aguilar, O.; Nettel-Hernanz, A.; Hurtado-Oliva, M.Á.; Dodd, R.S.; Flores-Cárdenas, F., and Manzano-Sarabia, M., 2020. Landscape metrics and conservation status of five mangrove wetlands in the eastern Gulf of California margin. Journal of Coastal Research, 36(1), 94–102. Coconut Creek (Florida), ISSN 0749-0208. Ecological significance and relevance of mangrove wetlands has been widely highlighted worldwide. Nevertheless, human-derived impacts and climate variability are increasing threats to these ecosystems in the last decades. Mangroves from Sinaloa (Mexico) integrate a large wetland corridor and provide several ecosystem services; however, diverse stressors could be increasing their vulnerability and associated biodiversity. The conservation status of five mangrove wetlands in this region was assessed through remote sensing techniques, landscape metrics, official databases and in situ records. In general, a decrease on mangrove cover was observed, excepting Estero de Urías and Ceuta, while aquaculture increased in all sites, with a greatest coverage in Santa María-La Reforma (increased 2057 ha in 18 years). The largest annual rate of change was observed in Huizache-Caimanero (–0.99%). Although conservation programs exist, there are signs of deterioration of mangrove wetlands according to this study.

Research paper thumbnail of Genetic signals of past demographic changes and the history of oak populations in California

Research paper thumbnail of Does stand density affect mating system and population genetic structure in coast live oak

Research paper thumbnail of Is variation in susceptibility to <i>Phytophthora ramorum</i> correlated with population genetic structure in coast live oak ( <i>Quercus agrifolia</i> )?

New Phytologist, Sep 2, 2004

Research paper thumbnail of Detecting the limits of northern and southern lineages of tanoak in northern California

Research paper thumbnail of Patterns of Fine-Scale Spatial Genetic Structure and Pollen Dispersal in Giant Sequoia (Sequoiadendron giganteum)

Research paper thumbnail of Calculation of Wood Density Variation From X-ray Densitometer Data

Wood and Fiber Science, 1988

Research paper thumbnail of Clonal Growth and Fine-Scale Genetic Structure in Tanoak (Notholithocarpus densiflorus: Fagaceae)

Journal of Heredity, Oct 29, 2012

Research paper thumbnail of Could Tanoak Mortality Affect Insect Biodiversity? Evidence For Insect Pollination in Tanoaks

Research paper thumbnail of Genetic Diversity of the Black Mangrove Avicennia germinans (L.) Stearn in Northwestern Mexico

Research paper thumbnail of Genetic hitch-hiking extends the range of coast live oak

Research paper thumbnail of Clonal Spread in Second Growth Stands of Coast Redwood, Sequoia sempervirens

Research paper thumbnail of Gene Flow Among Populations of Three California Evergreen Oaks

Research paper thumbnail of Ancestral seed zones and genetic mixture of tanoak

Research paper thumbnail of Genetic Structure ofNotholithocarpus densiflorus(Fagaceae) from the Species to the Local Scale: A Review of Our Knowledge for Conservation and Replanting

Research paper thumbnail of Salix Exigua Clonal Growth and Population Dynamics in Relation to Disturbance Regime Variation

Research paper thumbnail of Evidence for the role of synchronicity between host phenology and pathogen activity in the distribution of sudden oak death canker disease

New Phytologist, Jun 28, 2008

Research paper thumbnail of Variation in genetic structure and gene flow across the range of Sequoiadendron giganteum (giant sequoia)

During this century, climate warming and altered precipitation patterns will lead to habitat chan... more During this century, climate warming and altered precipitation patterns will lead to habitat changes that may be beneficial to some long-lived tree species and detrimental to others. Paleoendemics, with limited and disjunct distributions will face the greatest challenges, as migration rates will be too slow to keep pace with rapid environmental change and populations at the receding edges are eroded through mal-adaption. Giant sequoia (Sequoiadendron giganteum (Lindl.) Buchholz) is an iconic Sierra Nevada tree species with populations that tend to be small and highly fragmented (particularly in the northern range), making them especially vulnerable to environmental change. Maintenance of genetic variation is an important determinant of population persistence that, in part, depends on gene flow within and between populations. The research presented here describes: 1) the distribution of genetic diversity among population pairs distributed across the range of giant sequoia, and 2) the...

Research paper thumbnail of Life history traits predict demographic responses to global warming in Arctic marine mammals

The glacial-interglacial transitions during the Late Quaternary effected the thickness and extent... more The glacial-interglacial transitions during the Late Quaternary effected the thickness and extent of glaciers and ice sheets as well as sea level height and ocean circulation patterns. These environmental changes altered the ecological conditions of many species both at high and low latitudes, and hence were evolution-driving forces. Here, we asked whether the Late Quaternary changes in the marine environment induced cross-taxa responses to widespread climatic stressors or whether only species-specific response occurred. Additionally, we asked whether demographic dynamics of marine species, in this case, marine mammals, have distinctive genetic signatures. The different life history traits within marine mammal species provide a unique opportunity to address these questions. We employed genetic data to infer the demographic history of marine mammal species inhabiting the Arctic with contrasting habitats and/or life history traits. This included resident, ice obligate species (e.g., p...

Research paper thumbnail of Biodiversity within natural populations of Cupressus bakeri (Goosenest Mountain, California)

Ecologia mediterranea, 1990

Les feuilles, les cônes et les graines de 51 individus de Cupressus bakeri Jeps. ont été récoltés... more Les feuilles, les cônes et les graines de 51 individus de Cupressus bakeri Jeps. ont été récoltés dans 6 populations naturelles du versant NE et NW du Mont de Goosenest dans la chaîne montagneuse de Cascades en Californie. L’analyse multivariante effectuée sur les caractères biométriques a montré un degré élevé de différenciation entre les diverses populations, même géographiquement très proches. La population GN2 du versant NW est bien distincte des autres. La variation entre les populations GN1 et GN2, très voisines, dans des conditions écologiques similaires, est surprenante et nous suggérons qu’il s’agit d’une différenciation plutôt d’origine génétique. La différence morphologique observée entre les populations du versant NE (GN4, GN5, GN6) est due aux conditions écologiques : c’est une différenciation phénotypique. Ces dernières populations possèdent les caractéristiques de celles du Mont Siskiyou et cela nous a incités à penser que le Mont de Goosenest pourrait être en effet u...

Research paper thumbnail of Landscape Metrics and Conservation Status of Five Mangrove Wetlands in the Eastern Gulf of California Margin

Journal of Coastal Research, 2019

ABSTRACT Millán-Aguilar, O.; Nettel-Hernanz, A.; Hurtado-Oliva, M.Á.; Dodd, R.S.; Flores-Cárdenas... more ABSTRACT Millán-Aguilar, O.; Nettel-Hernanz, A.; Hurtado-Oliva, M.Á.; Dodd, R.S.; Flores-Cárdenas, F., and Manzano-Sarabia, M., 2020. Landscape metrics and conservation status of five mangrove wetlands in the eastern Gulf of California margin. Journal of Coastal Research, 36(1), 94–102. Coconut Creek (Florida), ISSN 0749-0208. Ecological significance and relevance of mangrove wetlands has been widely highlighted worldwide. Nevertheless, human-derived impacts and climate variability are increasing threats to these ecosystems in the last decades. Mangroves from Sinaloa (Mexico) integrate a large wetland corridor and provide several ecosystem services; however, diverse stressors could be increasing their vulnerability and associated biodiversity. The conservation status of five mangrove wetlands in this region was assessed through remote sensing techniques, landscape metrics, official databases and in situ records. In general, a decrease on mangrove cover was observed, excepting Estero de Urías and Ceuta, while aquaculture increased in all sites, with a greatest coverage in Santa María-La Reforma (increased 2057 ha in 18 years). The largest annual rate of change was observed in Huizache-Caimanero (–0.99%). Although conservation programs exist, there are signs of deterioration of mangrove wetlands according to this study.