Jonathan Q Richmond
Jonathan Richmond is a geneticist at the Western Ecological Research Center.
Science and Products
Filter Total Items: 31
Influence of niche breadth and position on the historical biogeography of seafaring scincid lizards
Niche breadth and position can influence diversification among closely related species or populations, yet limited empirical data exist concerning the predictability of the outcomes. We explored the effects of these factors on the evolution of the Emoia atrocostata species group, an insular radiation of lizards in the western Pacific Ocean and Indo-Australasia composed of both endemic and widespre
Authors
Jonathan Q. Richmond, Hidetoshi Ota, L Lee Grismer, Robert N. Fisher
Noninvasive identification of cryptic herpetofauna from fecal samples: A novel approach pairing conservation dog surveys and genetic analysis
Noninvasive fecal sampling combined with genetic analysis is a powerful technique allowing the study of elusive or otherwise difficult to monitor species without the need for direct contact. While this method is widely used in birds and mammals, it has never been successfully applied on a large scale in reptiles. The blunt-nosed leopard lizard (Gambelia sila) is an endangered species endemic to th
Authors
MJ Statham, DA Woollett, S Fresquez, John M. Pfeiffer, Jonathan Q. Richmond, A Whitelaw, NL Richards, Michael F. Westphal, BN Sacks
Insular biogeographic origins and high phylogenetic distinctiveness for a recently depleted lizard fauna from Christmas Island, Australia
Striking faunal turnover across Asia and Australasia, most famously along the eastern edge of the Sunda Shelf or ‘Wallace's Line’, has been a focus of biogeographic research for over 150 years. Here, we investigate the origins of a highly threatened endemic lizard fauna (four species) on Christmas Island. Despite occurring less 350 km south of the Sunda Shelf, this fauna mostly comprises species f
Authors
Paul M. Oliver, Mozes P. K. Blom, Harold G. Cogger, Robert N. Fisher, Jonathan Q. Richmond, John C. Z. Woinarski
Loss of dendritic connectivity in southern California's urban riverscape facilitates decline of an endemic freshwater fish
Life history adaptations and spatial configuration of metapopulation networks allow certain species to persist in extreme fluctuating environments, yet long-term stability within these systems relies on the maintenance of linkage habitat. Degradation of such linkages in urban riverscapes can disrupt this dynamic in aquatic species, leading to increased extinction debt in local populations experien
Authors
Jonathan Q. Richmond, Adam R. Backlin, Carey Galst-Cavalcante, John W. O'Brien, Robert N. Fisher
An extirpated lineage of a threatened frog species resurfaces in southern California
Southern California has experienced widespread amphibian declines since the 1960s. One species, the Vulnerable California red-legged frog Rana draytonii, is now considered to be extirpated from most of southern California. In February 2017 a population of R. draytonii was discovered in the southern foothills of the San Bernardino Mountains of Riverside County, California, near the edge of the spec
Authors
Adam R. Backlin, Jonathan Q. Richmond, Elizabeth Gallegos, Clinton K. Christensen, Robert N. Fisher
At the end of the line: independent overwater colonizations of the Solomon Islands by a hyperdiverse trans-Wallacean lizard lineage (Cyrtodactylus: Gekkota: Squamata)
The islands of East Melanesia have generated key insights into speciation processes and community assembly. However, when and how these islands began to form, emerge and accumulate endemic taxa remains poorly understood. Here, we show that two divergent lineages within the world’s most diverse genus of geckos (Cyrtodactylus) occur in the Solomon Islands. One large-bodied species is nested within a
Authors
Paul M. Oliver, Scott L Travers, Jonathan Q. Richmond, Patrick Pikacha, Robert N. Fisher
Persistence of historical population structure in an endangered species despite near-complete biome conversion in California's San Joaquin Desert
Genomic responses to habitat conversion can be rapid, providing wildlife managers with time-limited opportunities to enact recovery efforts that use population connectivity information that reflects predisturbance landscapes. Despite near-complete biome conversion, such opportunities may still exist for the endemic fauna and flora of California's San Joaquin Desert, but comprehensive genetic data
Authors
Jonathan Q. Richmond, Dustin A. Wood, Michael F. Westphal, Amy G. Vandergast, Adam D. Leache, Lawrence Saslaw, H. Scott Butterfield, Robert N. Fisher
Rare alluvial sands of El Monte Valley, California (San Diego County), support high herpetofaunal species richness and diversity, despite severe habitat disturbance
We characterized the species richness, diversity, and distribution of amphibians and reptiles inhabiting El Monte Valley, a heavily disturbed, alluvium-filled basin within the lower San Diego River in Lakeside, California. This rare habitat type in coastal southern California is designated as a critical sand resource by the state of California and is currently under consideration for a large-scale
Authors
Jonathan Q. Richmond, Carlton J. Rochester, Nathan W. Smith, Jeffrey A. Nordland, Robert N. Fisher
Historical habitat barriers prevent ring-like genetic continuity throughout the distribution of threatened Alameda Striped Racers (Coluber lateralis euryxanthus)
We used microsatellites and mtDNA sequences to examine the mixed effects of geophysical, habitat, and contemporary urban barriers on the genetics of threatened Alameda Striped Racers (Coluber lateralis euryxanthus), a species with close ties to declining coastal scrub and chaparral habitat in the eastern San Francisco Bay area of California. We used cluster assignments to characterize population g
Authors
Jonathan Q. Richmond, Dustin A. Wood, Karen Swaim, Robert N. Fisher, Amy G. Vandergast
Status of the California Red-legged Frog (Rana draytonii) in the State of Baja California, México
The California Red-legged Frog (Rana draytonii) is a threatened species in the United States that has undergone population declines, especially in southern California. Due to the lack of information on the status of Mexican populations, we surveyed for the presence of R. draytonii in Baja California and assessed possible threats to population persistence. Our study area extended from the U.S.-Mexi
Authors
Anny Peralta-Garcia, Bradford D. Hellingsworth, Jonathan Q. Richmond, Jorge H. Valdez-Villavicencio, Gorgonio Ruiz-Campos, Robert N. Fisher, Pedro Cruz-Hernandez, Patricia Galina-Tessaro
Niche divergence builds the case for ecological speciation in skinks of the Plestiodon skiltonianus species complex
Adaptation to different thermal environments has the potential to cause evolutionary changes that are sufficient to drive ecological speciation. Here, we examine whether climate-based niche divergence in lizards of the Plestiodon skiltonianus species complex is consistent with the outcomes of such a process. Previous work on this group shows that a mechanical sexual barrier has evolved between spe
Authors
Guinevere O.U. Wogan, Jonathan Q. Richmond
Ephemeral stream reaches preserve the evolutionary and distributional history of threespine stickleback in the Santa Clara and Ventura River watersheds of southern California
Much remains to be understood about the evolutionary history and contemporary landscape genetics of unarmored threespine stickleback in southern California, where populations collectively referred to as Gasterosteus aculeatus williamsoni have severely declined over the past 70+ years and are now endangered. We used mitochondrial sequence and microsatellite data to assess the population genetics an
Authors
Jonathan Q. Richmond, David K. Jacobs, Adam R. Backlin, Camm C. Swift, Chris Dellith, Robert N. Fisher
Science and Products
Filter Total Items: 31
Influence of niche breadth and position on the historical biogeography of seafaring scincid lizards
Niche breadth and position can influence diversification among closely related species or populations, yet limited empirical data exist concerning the predictability of the outcomes. We explored the effects of these factors on the evolution of the Emoia atrocostata species group, an insular radiation of lizards in the western Pacific Ocean and Indo-Australasia composed of both endemic and widespre
Authors
Jonathan Q. Richmond, Hidetoshi Ota, L Lee Grismer, Robert N. Fisher
Noninvasive identification of cryptic herpetofauna from fecal samples: A novel approach pairing conservation dog surveys and genetic analysis
Noninvasive fecal sampling combined with genetic analysis is a powerful technique allowing the study of elusive or otherwise difficult to monitor species without the need for direct contact. While this method is widely used in birds and mammals, it has never been successfully applied on a large scale in reptiles. The blunt-nosed leopard lizard (Gambelia sila) is an endangered species endemic to th
Authors
MJ Statham, DA Woollett, S Fresquez, John M. Pfeiffer, Jonathan Q. Richmond, A Whitelaw, NL Richards, Michael F. Westphal, BN Sacks
Insular biogeographic origins and high phylogenetic distinctiveness for a recently depleted lizard fauna from Christmas Island, Australia
Striking faunal turnover across Asia and Australasia, most famously along the eastern edge of the Sunda Shelf or ‘Wallace's Line’, has been a focus of biogeographic research for over 150 years. Here, we investigate the origins of a highly threatened endemic lizard fauna (four species) on Christmas Island. Despite occurring less 350 km south of the Sunda Shelf, this fauna mostly comprises species f
Authors
Paul M. Oliver, Mozes P. K. Blom, Harold G. Cogger, Robert N. Fisher, Jonathan Q. Richmond, John C. Z. Woinarski
Loss of dendritic connectivity in southern California's urban riverscape facilitates decline of an endemic freshwater fish
Life history adaptations and spatial configuration of metapopulation networks allow certain species to persist in extreme fluctuating environments, yet long-term stability within these systems relies on the maintenance of linkage habitat. Degradation of such linkages in urban riverscapes can disrupt this dynamic in aquatic species, leading to increased extinction debt in local populations experien
Authors
Jonathan Q. Richmond, Adam R. Backlin, Carey Galst-Cavalcante, John W. O'Brien, Robert N. Fisher
An extirpated lineage of a threatened frog species resurfaces in southern California
Southern California has experienced widespread amphibian declines since the 1960s. One species, the Vulnerable California red-legged frog Rana draytonii, is now considered to be extirpated from most of southern California. In February 2017 a population of R. draytonii was discovered in the southern foothills of the San Bernardino Mountains of Riverside County, California, near the edge of the spec
Authors
Adam R. Backlin, Jonathan Q. Richmond, Elizabeth Gallegos, Clinton K. Christensen, Robert N. Fisher
At the end of the line: independent overwater colonizations of the Solomon Islands by a hyperdiverse trans-Wallacean lizard lineage (Cyrtodactylus: Gekkota: Squamata)
The islands of East Melanesia have generated key insights into speciation processes and community assembly. However, when and how these islands began to form, emerge and accumulate endemic taxa remains poorly understood. Here, we show that two divergent lineages within the world’s most diverse genus of geckos (Cyrtodactylus) occur in the Solomon Islands. One large-bodied species is nested within a
Authors
Paul M. Oliver, Scott L Travers, Jonathan Q. Richmond, Patrick Pikacha, Robert N. Fisher
Persistence of historical population structure in an endangered species despite near-complete biome conversion in California's San Joaquin Desert
Genomic responses to habitat conversion can be rapid, providing wildlife managers with time-limited opportunities to enact recovery efforts that use population connectivity information that reflects predisturbance landscapes. Despite near-complete biome conversion, such opportunities may still exist for the endemic fauna and flora of California's San Joaquin Desert, but comprehensive genetic data
Authors
Jonathan Q. Richmond, Dustin A. Wood, Michael F. Westphal, Amy G. Vandergast, Adam D. Leache, Lawrence Saslaw, H. Scott Butterfield, Robert N. Fisher
Rare alluvial sands of El Monte Valley, California (San Diego County), support high herpetofaunal species richness and diversity, despite severe habitat disturbance
We characterized the species richness, diversity, and distribution of amphibians and reptiles inhabiting El Monte Valley, a heavily disturbed, alluvium-filled basin within the lower San Diego River in Lakeside, California. This rare habitat type in coastal southern California is designated as a critical sand resource by the state of California and is currently under consideration for a large-scale
Authors
Jonathan Q. Richmond, Carlton J. Rochester, Nathan W. Smith, Jeffrey A. Nordland, Robert N. Fisher
Historical habitat barriers prevent ring-like genetic continuity throughout the distribution of threatened Alameda Striped Racers (Coluber lateralis euryxanthus)
We used microsatellites and mtDNA sequences to examine the mixed effects of geophysical, habitat, and contemporary urban barriers on the genetics of threatened Alameda Striped Racers (Coluber lateralis euryxanthus), a species with close ties to declining coastal scrub and chaparral habitat in the eastern San Francisco Bay area of California. We used cluster assignments to characterize population g
Authors
Jonathan Q. Richmond, Dustin A. Wood, Karen Swaim, Robert N. Fisher, Amy G. Vandergast
Status of the California Red-legged Frog (Rana draytonii) in the State of Baja California, México
The California Red-legged Frog (Rana draytonii) is a threatened species in the United States that has undergone population declines, especially in southern California. Due to the lack of information on the status of Mexican populations, we surveyed for the presence of R. draytonii in Baja California and assessed possible threats to population persistence. Our study area extended from the U.S.-Mexi
Authors
Anny Peralta-Garcia, Bradford D. Hellingsworth, Jonathan Q. Richmond, Jorge H. Valdez-Villavicencio, Gorgonio Ruiz-Campos, Robert N. Fisher, Pedro Cruz-Hernandez, Patricia Galina-Tessaro
Niche divergence builds the case for ecological speciation in skinks of the Plestiodon skiltonianus species complex
Adaptation to different thermal environments has the potential to cause evolutionary changes that are sufficient to drive ecological speciation. Here, we examine whether climate-based niche divergence in lizards of the Plestiodon skiltonianus species complex is consistent with the outcomes of such a process. Previous work on this group shows that a mechanical sexual barrier has evolved between spe
Authors
Guinevere O.U. Wogan, Jonathan Q. Richmond
Ephemeral stream reaches preserve the evolutionary and distributional history of threespine stickleback in the Santa Clara and Ventura River watersheds of southern California
Much remains to be understood about the evolutionary history and contemporary landscape genetics of unarmored threespine stickleback in southern California, where populations collectively referred to as Gasterosteus aculeatus williamsoni have severely declined over the past 70+ years and are now endangered. We used mitochondrial sequence and microsatellite data to assess the population genetics an
Authors
Jonathan Q. Richmond, David K. Jacobs, Adam R. Backlin, Camm C. Swift, Chris Dellith, Robert N. Fisher