Detection of early pregnancy in Caribou : Evidence for embryonic mortality

IF 1.9 3区环境科学与生态学 Q3 ECOLOGY

Journal of Wildlife Management Pub Date : 1998-07-01 DOI:10.2307/3802559

D. Russell, K. Gerhart, R. White, D. V. D. Wetering

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引用次数: 74

Abstract

To investigate relations between body condition and fecundity, we determined pregnancy status of arctic caribou (Rangifer tarandus granti) from presence or absence of pregnancy-specific protein B (PSPB) and progesterone concentration in blood sera or plasma. We drew peripheral blood samples from female caribou 3-5 (n = 142) and 20-23 (n = 44) weeks after the breeding season. We then weighed and estimated the fat content of each caribou, and we radiocollared 115 of 184 individuals. We verified parturition status for 96 of these radiocollared females in June. In addition, we determined presence of PSPB for captive caribou in autumn and early winter. Progesterone concentration was superior to PSPB as a predictor of pregnancy during early gestation, and a threshold value of 1.5 ng/mL was used to separate pregnant from nonpregnant females in autumn and winter. Pregnancy status was strongly related to body condition in both autumn and winter, and fatter or heavier caribou were more likely to be pregnant. Use of both PSPB and progesterone concentration allowed detection of early embryonic mortality among lactating caribou that were in poor condition.

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驯鹿早孕的检测:胚胎死亡的证据

为了探讨身体状况与繁殖力之间的关系，我们通过测定北极驯鹿(Rangifer tarandus granti)血清或血浆中妊娠特异性蛋白B (PSPB)和孕酮浓度的存在与否来确定其妊娠状态。母驯鹿在繁殖季节结束后3-5周(n = 142)和20-23周(n = 44)采集外周血。然后我们称重并估计了每只驯鹿的脂肪含量，并对184只驯鹿中的115只进行了放射性项圈检测。我们在6月份对其中96只戴了放射性项圈的雌性进行了分娩状态验证。此外，我们还测定了秋季和初冬圈养驯鹿PSPB的存在。孕酮浓度优于PSPB作为妊娠早期的预测因子，在秋季和冬季使用1.5 ng/mL的阈值来区分怀孕和未怀孕的雌性。怀孕状况与秋季和冬季的身体状况密切相关，更胖或更重的驯鹿更有可能怀孕。使用PSPB和黄体酮浓度可以检测条件较差的哺乳期驯鹿的早期胚胎死亡率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Wildlife Management 环境科学-动物学

CiteScore

4.00

自引率

13.00%

发文量

188

审稿时长

9-24 weeks

期刊介绍： The Journal of Wildlife Management publishes manuscripts containing information from original research that contributes to basic wildlife science. Suitable topics include investigations into the biology and ecology of wildlife and their habitats that has direct or indirect implications for wildlife management and conservation. This includes basic information on wildlife habitat use, reproduction, genetics, demographics, viability, predator-prey relationships, space-use, movements, behavior, and physiology; but within the context of contemporary management and conservation issues such that the knowledge may ultimately be useful to wildlife practitioners. Also considered are theoretical and conceptual aspects of wildlife science, including development of new approaches to quantitative analyses, modeling of wildlife populations and habitats, and other topics that are germane to advancing wildlife science. Limited reviews or meta analyses will be considered if they provide a meaningful new synthesis or perspective on an appropriate subject. Direct evaluation of management practices or policies should be sent to the Wildlife Society Bulletin, as should papers reporting new tools or techniques. However, papers that report new tools or techniques, or effects of management practices, within the context of a broader study investigating basic wildlife biology and ecology will be considered by The Journal of Wildlife Management. Book reviews of relevant topics in basic wildlife research and biology.