Jonathan Q Richmond
Jonathan Richmond is a geneticist at the Western Ecological Research Center.
Science and Products
Filter Total Items: 34
Loss of dendritic connectivity in southern California's urban riverscape facilitates decline of an endemic freshwater fish 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...
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 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...
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) 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...
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 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...
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 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...
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) 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...
Authors
Jonathan Q. Richmond, Dustin A. Wood, Karen Swaim, Robert N. Fisher, Amy G. Vandergast
Science and Products
Filter Total Items: 34
Loss of dendritic connectivity in southern California's urban riverscape facilitates decline of an endemic freshwater fish 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...
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 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...
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) 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...
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 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...
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 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...
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) 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...
Authors
Jonathan Q. Richmond, Dustin A. Wood, Karen Swaim, Robert N. Fisher, Amy G. Vandergast