Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Douglas M. Burn"'
Autor:
Anatoly A. Kochnev, Alexander Lisovsky, Anthony S. Fischbach, Suzann G. Speckman, Mark S. Udevitz, Vladimir I. Chernook, Douglas M. Burn, Alexander Vasilev, Chadwick V. Jay, R. Bradley Benter
Publikováno v:
Marine Mammal Science. 27:514-553
In spring 2006, we conducted a collaborative U.S.–Russia survey to estimate abundance of the Pacific walrus (Odobenus rosmarus divergens). The Bering Sea was partitioned into survey blocks, and a systematic random sample of transects within a subse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::702349e83c71549ae284a08925c80b05
https://doi.org/10.1111/j.1748-7692.2010.00419.x
https://doi.org/10.1111/j.1748-7692.2010.00419.x
An improved procedure for detection and enumeration of walrus signatures in airborne thermal imagery
Publikováno v:
International Journal of Applied Earth Observation and Geoinformation. 11:324-333
In recent years, application of remote sensing to marine mammal surveys has been a promising area of investigation for wildlife managers and researchers. In April 2006, the United States and Russia conducted an aerial survey of Pacific walrus (Odoben
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::471d41bff03faeaf23cf81f41bd3265b
https://doi.org/10.1016/j.jag.2009.05.004
https://doi.org/10.1016/j.jag.2009.05.004
Publikováno v:
Marine Mammal Science. 24:57-70
Population sizes of ice-associated pinnipeds have often been estimated with visual or photographic aerial surveys, but these methods require relatively slow speeds and low altitudes, limiting the area they can cover. Recent developments in infrared i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0a004cb0629739e0fa43e8cb47bccca
https://doi.org/10.1111/j.1748-7692.2007.00169.x
https://doi.org/10.1111/j.1748-7692.2007.00169.x
Publikováno v:
Wildlife Society Bulletin. 34:51-58
We conducted tests of airborne thermal imagery of Pacific walrus to determine if this technology can be used to detect walrus groups on sea ice and estimate the number of walruses present in each group. In April 2002 we collected thermal imagery of 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d9afb8ca490f50b53fe780e08fa3061
https://doi.org/10.2193/0091-7648(2006)34[51:aoatit]2.0.co
https://doi.org/10.2193/0091-7648(2006)34[51:aoatit]2.0.co
Publikováno v:
Marine Mammal Science. 21:169-172
Recently published data demonstrated a sea otter population collapse across theAleutian archipelago (Doroff et al. 2003). This assessment, undertaken in responseto earlier reports of precipitous declines at several islands (Estes et al. 1998), wasbas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3493890681c5515400c3e7b5276fc9fa
https://doi.org/10.1111/j.1748-7692.2005.tb01218.x
https://doi.org/10.1111/j.1748-7692.2005.tb01218.x
Publikováno v:
Journal of Mammalogy. 84:55-64
Sea otter (Enhydra lutris) populations were exploited to near extinction and began to recover after the cessation of commercial hunting in 1911. Remnant colonies of sea otters in the Aleutian archipelago were among the first to recover; they continue
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5579710242862ef3a3fcc4c56e3610ad
https://doi.org/10.1644/1545-1542(2003)084<0055:sopdit>2.0.co
https://doi.org/10.1644/1545-1542(2003)084<0055:sopdit>2.0.co
Publikováno v:
Marine Mammal Science. 9:343-359
This paper presents an estimate of the total number of sea otters that died as a direct consequence of the oil spill that occurred when the T/V Exxon Valdez grounded in Prince William Sound, Alaska on 24 March 1989. We compared sea otter counts condu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eac528a8b9bbdd5cc19cc7259dc6bf08
https://doi.org/10.1111/j.1748-7692.1993.tb00468.x
https://doi.org/10.1111/j.1748-7692.1993.tb00468.x
Publikováno v:
Northwestern Naturalist. 84:145
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3480a90527bb1c5b25badf64951e792
https://doi.org/10.2307/3536541
https://doi.org/10.2307/3536541
Autor:
Douglas M. Burn
Publikováno v:
Comparative Biochemistry and Physiology Part A: Physiology. 85:139-142
1. 1. During the winters of 1982/83 and 1983/84, samples of digesta were collected from nine sites along the gastrointestinal tracts of seven West Indian manatees, Trichechus manatus . 2. 2. The voluminous large intestine of the manatee is responsibl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67ac40cd046a4fbb08a2a05a58e51585
https://doi.org/10.1016/0300-9629(86)90475-5
https://doi.org/10.1016/0300-9629(86)90475-5