American Eel Fecundity and Ovary Maturation in Relation to Body Size and Geographic Distribution
American Eel Fecundity and Ovary Maturation in Relation to Body Size and Geographic Distribution
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美洲鳗的繁殖力和卵巢成熟与体型和地理分布的关系
DOI：
10.1002/mcf2.10011
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
B. Jessop
中科院分区：
文献类型：
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作者：
B. Jessop
从圣劳伦斯河上游(USLR)到北美大西洋沿岸切萨皮克湾以南的不同地点，迁徙的性成熟雌性美洲鳗的繁殖力与体长和体重的关系存在显著差异。四项美国鳗鱼研究中有两项的生殖力-大小关系可能被低估，影响了对繁殖力与大小和产卵区距离以及大西洋鳗种之间关系的解释。身体状况和卵巢状况在地点内和地点之间差异很大。大陆出发的情况可能没有地理趋势。在圣劳伦斯河下游迁徙期间，随着大西洋沿岸与产卵区距离的增加，条件的下降可能是统计上的人工产物。黄鳗在USLR及其中河口之间的下游迁徙的卵巢条件增加，但在河口和海岸离开时没有显示出地理趋势。相对繁殖力随着种群大小的增加而降低，这意味着在USLR等地区失去大而多产的雌性种群对种群繁殖力的影响可能比之前假设的要小，但由于遗传和其他原因可能是重要的。体型和组织脂质水平的增加以及相对繁殖力的降低可能是帮助美洲鳗远距离迁徙成功产卵的特征。与体型相似的欧洲鳗相比，美洲鳗离开淡水时具有更高的繁殖力和性腺发育，更低的组织脂水平和卵子直径。安圭拉。为了提高生育力研究的可比性和解释力，需要标准化的方法和足够的样本量。更好地了解鳗鱼大小、繁殖特征和丰度的地理差异之间的关系，对于有效管理美国鳗鱼种群至关重要。
Fecundity, in relation to body length and weight, of migrating, sexually maturing female American EelsAnguilla rostratadiffered significantly among sites between the upper St. Lawrence River (USLR) and south to Chesapeake Bay along the Atlantic coast of North America. Fecundity–size relations from two of four American Eel studies may be underestimated, affecting the interpretation of fecundity relations with size and distance from the spawning area and between Atlantic anguillid species. Body condition and ovary condition varied widely within and among sites. Condition at continental departure may have no geographic trend. The declines in condition during downstream migration within the St. Lawrence River and with increasing distance from the spawning area along the Atlantic coast may be statistical artifacts. Ovary condition increased for eels migrating downstream between the USLR and its middle estuary but showed no geographic trend at estuarine and coastal departure. Decreased relative fecundity with increasing size implies that the loss of large, fecund females from areas such as the USLR may have less of an effect on population fecundity than previously hypothesized but may be important for genetic and other reasons. Increased size and tissue lipid levels and decreased relative fecundity may be traits that aid American Eels migrating longer distances to spawn successfully. American Eels depart freshwaters with a higher fecundity and gonad development and lower tissue lipid levels and ova diameters than do similarly sized European EelsA. anguilla. Standardized methods and adequate sample sizes are needed to enhance the comparability and interpretation of fecundity studies. A better understanding of the relations among geographic differences in eel size, reproductive traits, and abundance is essential to effectively manage the American Eel population.
西北太平洋淡水鳗鱼的海洋洄游和产卵生态
DOI：
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发表时间：
2011
期刊：
影响因子：
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作者：
Watanabe;et al.;Tsukamoto K.
通讯作者：
Tsukamoto K.