Zobrazeno 1 - 10
of 12
pro vyhledávání: '"David H. Levenson"'
Publikováno v:
Endangered Species Research. 5:249-256
Leatherback and other marine turtles are classified as Critically Endangered or Endangered by the International Union for Conservation of Nature (IUCN), largely due to anthropogenic factors (e.g. poaching, habitat destruction and incidental mortality
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::11f3b85dbeef75b1337354f1cb57ba21
https://doi.org/10.3354/esr00112
https://doi.org/10.3354/esr00112
Publikováno v:
American Journal of Primatology. 69:757-765
Aotus is a platyrrhine primate that has been classically considered to be nocturnal. Earlier research revealed that this animal lacks a color vision capacity because, unlike all other platyrrhine monkeys, Aotus has a defect in the opsin gene that is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9b54aa09e1752bfc0997995276f4113
https://doi.org/10.1002/ajp.20402
https://doi.org/10.1002/ajp.20402
Autor:
Michael A. Crognale, S. A. Kubis, Scott A. Eckert, David H. Levenson, Craig A. Harms, M. Campbell
Publikováno v:
Veterinary Record. 161:15-21
Ten nesting leatherback sea turtles on Trinidad were anaesthetised for electroretinogram (ERG) measurements, using ketamine and medetomidine, reversed with atipamezole. They weighed 242 to 324 kg and were given initial doses of 3 to 8 mg/kg ketamine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5f0b4f8f51afd04248f90872471edee
https://doi.org/10.1136/vr.161.1.15
https://doi.org/10.1136/vr.161.1.15
Publikováno v:
Copeia. 2004:908-914
Flicker electroretinography (ERG) was used to examine the in situ photopic (cone-photoreceptor based) spectral sensitivities of Green and Loggerhead Sea Turtles. Both species were responsive to wavelengths from 440–700 nm, and both had peak sensiti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d947ac98df0f6bdcdee4f7b6ef419eb3
https://doi.org/10.1643/cp-03-217r1
https://doi.org/10.1643/cp-03-217r1
Publikováno v:
Marine Mammal Science. 18:275-281
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::780a1a4afb3a6db664c72faff6a25ce9
https://doi.org/10.1111/j.1748-7692.2002.tb01033.x
https://doi.org/10.1111/j.1748-7692.2002.tb01033.x
Publikováno v:
Marine Mammal Science. 15:1303-1313
Pinnipeds forage almost exclusively underwater. Consequently, observing them is difficult and relatively little is known of how they use their senses to locate prey, avoid predators, and navigate while diving. Vision has been presumed to be of primar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::865912fc11635f8c52f4bfd4a76ccf81
https://doi.org/10.1111/j.1748-7692.1999.tb00892.x
https://doi.org/10.1111/j.1748-7692.1999.tb00892.x
Publikováno v:
Canadian Journal of Zoology. 76:2114-2118
The retinas of harbor seals (Phoca vitulina) contain two morphologically distinct photoreceptor types: rods and cones. The spectral properties of the cones have not been previously studied. The spectral sensitivities of the cones of harbor seals were
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::923dfe5c7b1d3ac5cebfc4053c7c2878
https://doi.org/10.1139/z98-129
https://doi.org/10.1139/z98-129
Autor:
Michael A. Crognale, David H. Levenson, Paul J. Ponganis, Jess F. Deegan II, Gerald H. Jacobs
Publikováno v:
Canadian Journal of Zoology. 76:2114-2118
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a38929af6e64cc61fda2553fbf4bb7e
https://doi.org/10.1139/cjz-76-11-2114
https://doi.org/10.1139/cjz-76-11-2114
Publikováno v:
Canadian Journal of Zoology. 75:2050-2057
Phocid and otariid pinnipeds forage almost exclusively under water, where observing them is difficult. As a result, little is known of how their senses are used while diving to locate and capture prey. In this study we used pupillometric methods to d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::204b55d357f921bbce614fc8f84adc5e
https://doi.org/10.1139/z97-838
https://doi.org/10.1139/z97-838
Autor:
Michael A. Crognale, Jess F. Deegan, Andy Dizon, Paul J. Ponganis, David H. Levenson, Gerald H. Jacobs
Publikováno v:
Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology. 192(8)
Rod and cone visual pigments of 11 marine carnivores were evaluated. Rod, middle/long-wavelength sensitive (M/L) cone, and short-wavelength sensitive (S) cone opsin (if present) sequences were obtained from retinal mRNA. Spectral sensitivity was infe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8440185c34c266bb911eb5b381af75a9
https://pubmed.ncbi.nlm.nih.gov/16572322
https://pubmed.ncbi.nlm.nih.gov/16572322