Do ovarian scars persist with age in all Cetaceans: new insight from the short-beaked common dolphin (Delphinus delphis Linnaeus, 1758)

被引:0
|
作者
Willy Dabin
François Cossais
Graham J. Pierce
Vincent Ridoux
机构
[1] Université de La Rochelle,Centre de Recherche sur les Mammifères Marins
[2] Instituto Español de Oceanografía,Centro Oceanográfico de Vigo
[3] Oceanlab,LIttoral ENvironnement et Sociétés
[4] University of Aberdeen,undefined
[5] UMR 6250,undefined
[6] CNRS-Université de La Rochelle,undefined
来源
Marine Biology | 2008年 / 156卷
关键词
Corpus Luteum; Pregnant Female; Ovulation Rate; Harbour Porpoise; Common Dolphin;
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学科分类号
摘要
The determination of reproductive status and the reconstruction of individual reproductive histories are central to many ecological studies. In cetaceans, it has been assumed that ovarian scars accumulate with age and provide a lifetime record of female reproductive history. If ovarian scars persist, the number of scars should increase with age after puberty. To test this, we examined age, reproductive status and ovarian scars from 187 short-beaked common dolphins (Delphinus delphis) from the eastern North Atlantic. The number of Corpus Albicans (CA) present in ovaries did not increase with age after age at sexual maturity (ASM), suggesting that ovarian scars are not persistent and that their number at any one time would be a function of rates of ovulation and healing, the latter being defined here as the resorption or disintegration of CA tissue. Since female mammals stop ovulating when pregnant, inferences about healing rates could be made by using pregnant females. Pregnant females had ca. 40% fewer scars than non-pregnant females. This suggests that most CAs would heal quickly, with a half-life of less than 1 year, although larger scars may persist longer. Therefore, counting CAs would have limited potential for reconstructing individual reproductive lifetime histories in the common dolphin. A reassessment of the use of ovarian scars to reconstruct individual life reproductive histories in cetaceans is suggested.
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页码:127 / 139
页数:12
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