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首页> 外文期刊>Aquatic Biology >Age estimation of brown shrimp Crangon crangon: comparison of two approaches applied to populations at the biogeographic edges
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Age estimation of brown shrimp Crangon crangon: comparison of two approaches applied to populations at the biogeographic edges

机译：棕色虾克朗贡虾的年龄估计：两种在生物地理边缘应用于种群的方法的比较

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In this study, 2 methods for age estimation of Crangon crangon were compared: one based on total length, the other based on the number of segments in the antennules, as suggested by Tiews' findings (1954: Ber Deut Wiss Kommiss 13:235-269). Shrimps from populations near the species' geographic edges, from Valosen Estuary (Norway) in the north and the Minho Estuary (Portugal) in the south, were used. These showed great individual variability in shrimp size growth and in antennule segment number increment, due to the presence of fast- and slow-growing shrimps in the 2 populations, implying that shrimps of different ages may have similar sizes, as well as similar segment numbers. Additionally, the origin of shrimp population, sex, length and segment number, and water temperature were found to influence growth, both in the length- and the segment-increment models, often being interacting parameters. Both methods resulted in growth curves similar to a typical von Bertalanffy growth curve. The growth ratewas higher for females than for males and positively related to temperature; the maximum size was also larger for females. In contrast, maximum segment number was larger for males than for females, as has also been found by Tiews (1954). The 2 models resulted in considerably different age estimates, particularly for older shrimps (i.e. shrimps of larger size or with more antennule segments). The models also suggest site-specific growth rates. Any age estimation approach will therefore need to be validated for each population.
机译：在这项研究中，比较了2种Crangon炸薯条的年龄估计方法：一种是基于总长度，另一种是根据铁环中节段的数量，这是Tiews的发现所建议的（1954年：Ber Deut Wiss Kommiss 13：235- 269）。使用了来自该物种地理边缘附近种群的虾，它们来自北部的瓦洛森河口（挪威）和南部的Minho河口（葡萄牙）。由于两个种群中虾的快慢生长，这表明虾的大小增长和环节数量增加的个体差异很大，这表明不同年龄的虾可能具有相似的大小和相似的数量。此外，在长度和分段增加模型中，虾的种群，性别，长度和分段数以及水温的来源都影响生长，通常是相互影响的参数。两种方法产生的生长曲线都与典型的冯·贝塔朗菲的生长曲线相似。女性的生长速度高于男性，并且与温度呈正相关;女性的最大尺寸也更大。相反，Tiews（1954）也发现，男性的最大节数大于女性。这两个模型得出的年龄估计值大不相同，尤其是对于较旧的虾（即，较大尺寸或具有更多圆环段的虾）。这些模型还建议了特定地点的增长率。因此，将需要针对每个人群验证任何年龄估计方法。

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