摘要:

AbstractA survey was conducted in the summer of 1991 in the western Mediterranean to map the distribution and to estimate the number of striped dolphins surviving the 1990 outbreak of the morbillivirus epizootic. The highest densities of striped dolphins were found in the Alboran Sea and the Ligurian Sea. Total numbers were estimated at 117,880 (SE: 38,962; 95% CI: 68,379–214,800). The mortality resulting from the epizootic is unknown but may have been severe because the mean size of dolphin schools observed during the epizootic outbreak was significantly smaller than that before the event. A return to larger school sizes after the 1990 outbreak is not evidence of a recovery but can be viewed as a regrouping of individuals into schools of a preferred size. Calves were observed in 24.6% of the schools. They were not seen in schools of ten or less but were present in about half the schools of 30 or more dolphins, a result which suggests segregation similar to that seen in populations of this species elsewhere in the worl

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00256.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractA mark‐recapture study conducted in 1987–1992 provided weight measurements of juvenile male northern fur seals (Callorhinus ursinus) on St. Paul Island, Alaska, at ages ranging from approximately 1.5 mo to 5 yr. Males born in 1987 tended to weigh less at ages 3 and 4 yr than those born in other years. Weights of individuals at ages 2, 3, and 4 yr were significantly correlated with their weights as pups (P<0.05). Weights at ages 2 and 3, 3 and 4, and 4 and 5 yr were significantly correlated (P<0.001), although weight changes with age were highly variable. Data indicate that larger than average male pups born during 1987–1990 were more likely to survive, but this effect was less evident than among pups born during 1960–1965 when average pup weights wer

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00257.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractSixty‐four aerial surveys were flown during cold, winter weather between December 1982 and February 1772 to provide an index of trends in abundance of the Florida manatee (Trichechus manatus latirostris)around five Florida Power&Light Company (FPL) plants. The surveys documented high winter use of warm‐water discharges at four of the plants (Canaveral, Riviera. Port Everglades, and Fort Myers). The total number of manatees sighted at the five primary plants surveyed during a single survey ranged from 6 to 765 manatees (x̄= 330 ± 45 manatees per survey): thus, up to 41% of the total Florida manatee minimum population of 1.850 animals may be found on cold days at FPL plants. The number of calves sighted at the plants during winter has decreased; similarly, for three consecutive years (winter 1989–1970 through winter 1991–1992), the percentage of the manatees that are calves sighted at the plants has decreased. Although data from the surveys of FPL plants do not necessarily reflect what may be happening with manatees located elsewhere in Florida, a possible reduction in calf numbers, coupled with increasing numbers of dead calves being documented by scientists involved in manatee carcass salvage work, is cause for concern in this slow‐reproducing, endange

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00258.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00259.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractCross‐species reactivity of 53 antibodies developed against human antigens was evaluated in the bottlenose dolphinTursiops truncatus, using immunoperoxidase techniques, Strong cross‐reactivity was demonstrated with antibodies against intermediate filaments, most hormones, but few leukocyte antigens. S100, NSE, F8RA, Factor XIIIa, and lactalbumin antibodies reacted, while HMB45, EMA, PLAP, and PSA did not. Polyclonal antibodies are much more likely to cross‐react than are monoclonal antibodies. Twenty‐four of 30 (80%) of polyclonals cross‐reacted, while only 10 of 23 (43.5%) monoclonals cross‐reacted. Some antigens are demonstrated only after using a special technique to unmask

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00260.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractRecent theories relating cetacean stranding sites to geomagnetic topography were tested for the New Zealand coastline. New Zealand herd strandings showed no relationship to either perpendicular geomagnetic contours or magnetic minima, nor did whales appear to be avoiding magnetic gradients. Single‐live stranding sites also showed no geomagnetic relationshi

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00261.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00262.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1994.tb00265.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY