본문 바로가기
HOME> 논문 > 논문 검색상세

논문 상세정보

General and comparative endocrinology v.255, 2018년, pp.78 - 89   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Pairing ultrasonography with endocrinology to elucidate underlying mechanisms of successful pregnancy in the northern fur seal (Callorhinus ursinus)

Shero, Michelle R. (Department of Biological Sciences, University of Alaska Anchorage, 3101 Science Circle, Anchorage, AK 99508-4614, USA ); Bergfelt, Don R. (Department of Biomedical Sciences, Ross University School of Veterinary Medicine, Basseterre 00265, Saint Kitts and Nevis ); Testa, J. Ward (National Marine Mammal Laboratory, Alaska Fisheries Science Center, 7600 Sand Point Way NE, Seattle, WA 98115-6349, USA ); Adams, Gregg P. (Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK S7N 5B4, Canada );
  • 초록  

    Abstract Reproductive success is one of the central tenets of conservation management programs, yet the inability to study underlying physiological processes in a minimally-invasive manner and the unpredictable nature of wild animal populations leaves large gaps in our knowledge of factors critical to successful reproduction in wild species. This study integrated ultrasonography of the reproductive tract and analysis of reproductive hormones in 172 northern fur seals ( Callorhinus ursinus ) to identify intrinsic factors associated with reinitiating embryonic growth at the end of diapause. Within the first 3–4 weeks of active gestation, pregnant fur seals ( n = 126) had a larger corpus luteum and fewer antral follicles than non-pregnant fur seals, or those still in diapause ( n = 46). This suggests that the conceptus drives changes in ovarian status to convey its presence to the female. Morphological changes in the reproductive tract associated with pregnancy were not reflected in differences in endocrine profiles (estradiol, estrone, progesterone, and relaxin) between pregnant and non-pregnant individuals. Hormone concentrations correlated more strongly with calendar date than with the presence or size of the conceptus, demonstrating that none of these reproductive hormones were reliable markers for early pregnancy diagnosis. Instead, the northern fur seal’s long diestrus may serve to reduce the probability of a temporal mismatch between corpus luteum regression and embryo implantation. Indeed, conception rates were high and confirmed rates of pregnancy loss were relatively low (11%). In this study, minimally-invasive ultrasonography was used in wild pinnipeds to detect very early pregnancy (embryonic vesicles >2 mm) in combination with ovarian and endocrine dynamics at the time of embryo implantation, shedding light on mechanisms for maternal recognition of pregnancy. This study is also the first to track whether these same animals carried the embryo to term, by observing fur seals during the birthing season the following year. Data do not support the notion that decreased pregnancy rates or higher pregnancy loss rates are major contributing factors to the northern fur seal’s population decline. Highlights Stasis of the wild northern fur seal population is not due to loss of fecundity. Pregnancy rate was high (96%) and pregnancy loss rate was low (11%). Ultrasound enabled embryo detection at the time of reactivation (end of diapause). Changes in progesterone, estrogens, and relaxin were not diagnostic of pregnancy. The presence of an embryo was associated with changes in ovarian morphology.


  • 주제어

    Diapause .   Embryo .   Pinniped .   Pregnancy .   Reproduction .   Ultrasonography.  

 활용도 분석

  • 상세보기

    amChart 영역
  • 원문보기

    amChart 영역

원문보기

무료다운로드
  • 원문이 없습니다.

유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.

원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.

NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.

이 논문과 함께 출판된 논문 + 더보기