From Progesterone in Biopsies to Estimates of Pregnancy Rates: Large Scale Reproductive Patterns of Two Sympatric Species of Common Dolphin, Delphinus spp. off California, USA and Baja, Mexico
From Progesterone in Biopsies to Estimates of Pregnancy Rates: Large Scale Reproductive Patterns of Two Sympatric Species of Common Dolphin, Delphinus spp. off California, USA and Baja, Mexico
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从活检中的黄体酮到妊娠率的估计：两种同域海豚（海豚属）的大规模繁殖模式。
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发表时间：
2014
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通讯作者：
W. Perryman
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作者：
N. Kellar;Marisa L Trego;S. Chivers;F. I. Archer;W. Perryman
摘要测定了507头雌性普通海豚（204头长喙海豚和303头短喙海豚）的鲸脂孕酮含量，并以此预测其妊娠状况。delphis）。样本采集于美国加州中部和墨西哥下加利福尼亚南端之间的北太平洋东部沿海沃茨。两种雌虫的妊娠率相似：D. capensis和28.1%（n = 85）的D. 海豚对于这两个物种，我们发现怀孕的地理模式很强，这表明有些地区更有利于怀孕的女性。从早秋（38.8%，n = 133）到晚秋（25.3%，n = 91），D. delphis，而D. Capensis。通过从大型研究船或从大型研究船发射的小型刚性船体充气船（RHIB）收集的活组织检查样本选择性的潜力。对“串联活检取样”的分析，即从每个船只/平台对相同的海豚群进行重复活检，几乎没有证据表明从一个平台对另一个平台进行活检的怀孕雌性普通海豚不成比例地多。这一结果加上妊娠状态相对于活检手术持续时间的分析，未能发现妊娠状态方面未考虑的采样偏倚的强有力证据。总之，这些结果表明，鲸脂孕酮浓度的效用，以评估怀孕状态在自由放养的鲸类动物，他们突出了潜在的因素与海豚怀孕率的人口水平的变化。
Abstract Blubber progesterone levels were measured in biopsy samples and used to predict the pregnancy status of 507 female common dolphins (204 long-beaked common dolphins, Delphinus capensis, and 303 short-beaked common dolphins, D. delphis). Samples were collected in the coastal waters of the eastern North Pacific between central California, USA and the southern end of Baja California, Mexico. The percentage of females pregnant was similar between the two species: 22.1% (n = 45) of D. capensis and 28.1% (n = 85) of D. delphis. For both species we found strong geographic patterns in pregnancy, suggesting that some areas were more conducive for pregnant females. A sizable drop in percent pregnant from early (38.8%, n = 133) to late (25.3%, n = 91) autumn was found in D. delphis but not in D. capensis. The potential for sample selectivity was examined via biopsies collected either from a large research ship or from a small, rigid-hull inflatable boat (RHIB) launched from the larger ship. An analysis of “Tandem Biopsy Sampling”, replicate biopsy effort on the same schools from each vessel/platform, yielded little evidence that disproportionately more pregnant female common dolphins were biopsied from one platform versus the other. This result plus an analysis of pregnancy status relative to the duration of biopsy operations failed to uncover strong evidence of unaccounted sampling bias with respect to pregnancy state. In total, these results demonstrate the utility of blubber progesterone concentrations to assess pregnancy status in free-ranging cetaceans and they highlight potential factors associated with population-level variation in dolphin pregnancy rates.