Douglas J Long | California Academy of Sciences (original) (raw)
Papers by Douglas J Long
Abstracts with programs, 2020
Cellular and Molecular Life Sciences, 1995
Japanese Journal of Ichthyology, Feb 15, 1994
Mammalian Species, Dec 15, 2016
Otospermophilus beecheyi (Richardson, 1829), the California ground squirrel (formerly, Beechey gr... more Otospermophilus beecheyi (Richardson, 1829), the California ground squirrel (formerly, Beechey ground squirrel), is dorsally brown with silver spotting. This facultatively social and ecologically flexible species occurs at a range of elevations, has a wide dietary niche, and is common in California grasslands and oak woodlands. Although listed as "Least Concern," it has a tenuous relationship with humans. It contributes to crop and infrastructure damage and is associated with the spread of zoonoses, including plague. Nonetheless, it is an important prey species for mammalian, reptilian, and avian predators and an ecosystem engineer that constructs burrows that benefit commensals. Ongoing study of its behavioral ecology continues to advance our understanding of mammalian antipredator behavior, disease transmission, behavioral plasticity, and social evolution.
Journal of Paleontology, Jul 1, 1993
Notidanodon lanceolatus Woodward is reported from Late Aptian strata of northern California. This... more Notidanodon lanceolatus Woodward is reported from Late Aptian strata of northern California. This specimen, the oldest fossil cow shark (Hexanchidae) in the New World, greatly extends the geographic distribution of this species and confirms the eurytopic distribution of this genus. We suggest that cow shark teeth evolve in an orderly sequence in which the mesial edge of the tooth is at first smooth (Notidanus muensteri), then serrate (Notidanus serratus, Notorynchus aptiensis), and finally dentate (Notidanodon lanceolatus).
Paleobiology, 1994
Seven endemic species of skates (Chondrichthyes: Rajidae) represent the only family of elasmobran... more Seven endemic species of skates (Chondrichthyes: Rajidae) represent the only family of elasmobranchs currently known to live in Antarctic continental waters. Many previous authors believed skates colonized Antarctic waters from Patagonia during interglacial periods in the Quaternary. However, recent fossil material collected from the middle Eocene La Meseta Formation of Seymour Island, Antarctic Peninsula, indicates that they may have persisted in Antarctic waters since the Paleogene. Additionally, oceanographic barriers present in the Neogene and Quaternary would have prevented dispersal from southern continents to Antarctica. A revised dispersal scenario, based on skate fossils, biology, paleogeography, and present centers of skate diversity, suggests that skates evolved in the western Tethys and North Boreal seas of western Europe in the Late Cretaceous and early Paleogene and emigrated into Antarctica during the early to middle Eocene via a dispersal corridor along the continental margins of the western Atlantic Ocean. Skates probably populated the Pacific Basin by passing from this dispersal corridor through the Arctic Ocean. Vicariant events, such as opening of the Drake Passage, the development of the Circum-Antarctic Current, and formation of deep and wide basins around Antarctica in the late Paleogene, created barriers that isolated some species of skates in Antarctica and prevented movement of other species of skates into Antarctica from northern areas. Skates are the only group of fishes known to have survived the Oligocene cooling of Antarctica that killed or extirpated the Paleogene ichthyofauna; they persisted by a combination of cold-tolerance, generalized diet, and unspecialized bathymetric and habitat preferences.
Go to AGRIS search. Beached marine birds and mammals of the North American west coast: a revised ... more Go to AGRIS search. Beached marine birds and mammals of the North American west coast: a revised guide to their census and identification, with supplemental keys to beached sea turtles and sharks. Ainley, DG. Corporate author, Gulf of the Farallones National Marine Sanctuary, Calif. Publisher, National Oceanic and Atmospheric Administration, Gulf of the Farallones National Marine Sanctuary, San Francisco, CA (USA). Date of publication, [1994. ...
California Fish and Game, Jul 23, 1996
The Wilson Journal of Ornithology, Jun 1, 2010
We document the molt sequence of flight feathers in Turkey Vultures (Cathartes aura) based on stu... more We document the molt sequence of flight feathers in Turkey Vultures (Cathartes aura) based on studies of captive and wild birds, and examination of museum specimens. We found an unusual pattern of primary replacement, which appears to be a modified form of Staffelmauser, or stepwise wing molt. A Staffelmauser-like strategy for replacement of the secondaries is also described. These patterns of feather replacement appear to be adaptations to maintain flying performance while replacing all primaries and most secondaries during each molt. To what extent molt patterns in Turkey Vultures reflect convergent adaptation for flight, rather than ancestral characters useful for phylogenetic studies, remains unknown.
Antarctic Science, Jun 1, 1992
A nearly complete lower pharyngeal tooth-plate from a large (over 60 cm long) fossil wrasse (Perc... more A nearly complete lower pharyngeal tooth-plate from a large (over 60 cm long) fossil wrasse (Perciformes: Labridae) was recently recovered from the middle to late Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula. This find increases the number of teleosts from the Eocene of Antarctica to five taxa, and further illustrates the diversity of the ichthyofauna in the Eocene Weddellian Sea prior to wide-scale climatic change in the Southern Ocean. The fossil wrasse represents the first occurrence of this family in Antarctica, and is one of the oldest fossils of this family from the Southern Hemisphere. Wrasses are not found in Antarctic waters today, and probably became extinct during the Oligocene due to a combination of climatic change, loss of shallow-water habitat, and changes in the trophic structure of the Weddell Sea.
Antarctic research series, Mar 21, 2013
Journal of Vertebrate Paleontology, Mar 6, 1992
ABSTRACT The marine waters of present-day Antarctica contain an exceedingly depauperate elasmobra... more ABSTRACT The marine waters of present-day Antarctica contain an exceedingly depauperate elasmobranch fauna. Recent investigations into the Eocene marine sediments of the La Meseta Formation of Seymour Island, Antarctic Peninsula yielded 13 fossil sharks new to the Antarctic region. Two, Stegostoma cf. S. fasciatum and Pseudoginglymostoma cf. P. brevicaudatum, were unknown as fossils. Squalus woodburnei, S. weltoni, and Anomotodon multidenticulata are new species. Heptranchias howelli, Centrophorus sp., ...
Proceedings of the Biological Society of Washington., 1999
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Abstracts with programs, 2020
Cellular and Molecular Life Sciences, 1995
Japanese Journal of Ichthyology, Feb 15, 1994
Mammalian Species, Dec 15, 2016
Otospermophilus beecheyi (Richardson, 1829), the California ground squirrel (formerly, Beechey gr... more Otospermophilus beecheyi (Richardson, 1829), the California ground squirrel (formerly, Beechey ground squirrel), is dorsally brown with silver spotting. This facultatively social and ecologically flexible species occurs at a range of elevations, has a wide dietary niche, and is common in California grasslands and oak woodlands. Although listed as "Least Concern," it has a tenuous relationship with humans. It contributes to crop and infrastructure damage and is associated with the spread of zoonoses, including plague. Nonetheless, it is an important prey species for mammalian, reptilian, and avian predators and an ecosystem engineer that constructs burrows that benefit commensals. Ongoing study of its behavioral ecology continues to advance our understanding of mammalian antipredator behavior, disease transmission, behavioral plasticity, and social evolution.
Journal of Paleontology, Jul 1, 1993
Notidanodon lanceolatus Woodward is reported from Late Aptian strata of northern California. This... more Notidanodon lanceolatus Woodward is reported from Late Aptian strata of northern California. This specimen, the oldest fossil cow shark (Hexanchidae) in the New World, greatly extends the geographic distribution of this species and confirms the eurytopic distribution of this genus. We suggest that cow shark teeth evolve in an orderly sequence in which the mesial edge of the tooth is at first smooth (Notidanus muensteri), then serrate (Notidanus serratus, Notorynchus aptiensis), and finally dentate (Notidanodon lanceolatus).
Paleobiology, 1994
Seven endemic species of skates (Chondrichthyes: Rajidae) represent the only family of elasmobran... more Seven endemic species of skates (Chondrichthyes: Rajidae) represent the only family of elasmobranchs currently known to live in Antarctic continental waters. Many previous authors believed skates colonized Antarctic waters from Patagonia during interglacial periods in the Quaternary. However, recent fossil material collected from the middle Eocene La Meseta Formation of Seymour Island, Antarctic Peninsula, indicates that they may have persisted in Antarctic waters since the Paleogene. Additionally, oceanographic barriers present in the Neogene and Quaternary would have prevented dispersal from southern continents to Antarctica. A revised dispersal scenario, based on skate fossils, biology, paleogeography, and present centers of skate diversity, suggests that skates evolved in the western Tethys and North Boreal seas of western Europe in the Late Cretaceous and early Paleogene and emigrated into Antarctica during the early to middle Eocene via a dispersal corridor along the continental margins of the western Atlantic Ocean. Skates probably populated the Pacific Basin by passing from this dispersal corridor through the Arctic Ocean. Vicariant events, such as opening of the Drake Passage, the development of the Circum-Antarctic Current, and formation of deep and wide basins around Antarctica in the late Paleogene, created barriers that isolated some species of skates in Antarctica and prevented movement of other species of skates into Antarctica from northern areas. Skates are the only group of fishes known to have survived the Oligocene cooling of Antarctica that killed or extirpated the Paleogene ichthyofauna; they persisted by a combination of cold-tolerance, generalized diet, and unspecialized bathymetric and habitat preferences.
Go to AGRIS search. Beached marine birds and mammals of the North American west coast: a revised ... more Go to AGRIS search. Beached marine birds and mammals of the North American west coast: a revised guide to their census and identification, with supplemental keys to beached sea turtles and sharks. Ainley, DG. Corporate author, Gulf of the Farallones National Marine Sanctuary, Calif. Publisher, National Oceanic and Atmospheric Administration, Gulf of the Farallones National Marine Sanctuary, San Francisco, CA (USA). Date of publication, [1994. ...
California Fish and Game, Jul 23, 1996
The Wilson Journal of Ornithology, Jun 1, 2010
We document the molt sequence of flight feathers in Turkey Vultures (Cathartes aura) based on stu... more We document the molt sequence of flight feathers in Turkey Vultures (Cathartes aura) based on studies of captive and wild birds, and examination of museum specimens. We found an unusual pattern of primary replacement, which appears to be a modified form of Staffelmauser, or stepwise wing molt. A Staffelmauser-like strategy for replacement of the secondaries is also described. These patterns of feather replacement appear to be adaptations to maintain flying performance while replacing all primaries and most secondaries during each molt. To what extent molt patterns in Turkey Vultures reflect convergent adaptation for flight, rather than ancestral characters useful for phylogenetic studies, remains unknown.
Antarctic Science, Jun 1, 1992
A nearly complete lower pharyngeal tooth-plate from a large (over 60 cm long) fossil wrasse (Perc... more A nearly complete lower pharyngeal tooth-plate from a large (over 60 cm long) fossil wrasse (Perciformes: Labridae) was recently recovered from the middle to late Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula. This find increases the number of teleosts from the Eocene of Antarctica to five taxa, and further illustrates the diversity of the ichthyofauna in the Eocene Weddellian Sea prior to wide-scale climatic change in the Southern Ocean. The fossil wrasse represents the first occurrence of this family in Antarctica, and is one of the oldest fossils of this family from the Southern Hemisphere. Wrasses are not found in Antarctic waters today, and probably became extinct during the Oligocene due to a combination of climatic change, loss of shallow-water habitat, and changes in the trophic structure of the Weddell Sea.
Antarctic research series, Mar 21, 2013
Journal of Vertebrate Paleontology, Mar 6, 1992
ABSTRACT The marine waters of present-day Antarctica contain an exceedingly depauperate elasmobra... more ABSTRACT The marine waters of present-day Antarctica contain an exceedingly depauperate elasmobranch fauna. Recent investigations into the Eocene marine sediments of the La Meseta Formation of Seymour Island, Antarctic Peninsula yielded 13 fossil sharks new to the Antarctic region. Two, Stegostoma cf. S. fasciatum and Pseudoginglymostoma cf. P. brevicaudatum, were unknown as fossils. Squalus woodburnei, S. weltoni, and Anomotodon multidenticulata are new species. Heptranchias howelli, Centrophorus sp., ...
Proceedings of the Biological Society of Washington., 1999
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Klein Karoo Biosphere Reserves, 2020
This checklist is updated from Martin’s 2005 Birds Recorded from the Klein Karoo, 2nd Edition, an... more This checklist is updated from Martin’s 2005 Birds Recorded from the Klein Karoo, 2nd Edition, and expanded with additional species recorded through other open sources, such as eBird and iNaturalist. Those species with an asterisk have been observed and recorded within in the Klein Karoo Biosphere Reserves. Species with a (R) after their name are “rare” species to the Klein Karoo, either as vagrants, accidental & extralimital occurrences, older records of species likely extirpated from the region, or possible range expansions into the region.