Effects of species misidentification on population assessment of overfished white marlin Tetrapturus albidus and roundscale spearfish T. georgii
Effects of species misidentification on population assessment of overfished white marlin Tetrapturus albidus and roundscale spearfish T. georgii
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DOI：
10.3354/esr00234
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发表时间：
2010-01-01
影响因子：
3.1
通讯作者：
Shivjl, Mahmood
中科院分区：
文献类型：
--
作者：
Beerkircher, Lawrence;Arocha, Freddy;Shivjl, Mahmood
白马林鱼被认为是大西洋国际管理管辖范围内过度开发最多的物种之一，引起了各种利益相关者的关注。已努力将其列入美国濒危物种名单。由于认识到以下原因，其种群状况变得不确定：(1)长期以来，人们对白马林鱼与最近发现的形态相似且同域的圆鳞旗鱼（T georgii）发生了误认；(2)在不知情的情况下，这两个物种被作为一个物种群进行评估和管理。我们发现，在北大西洋西部，圆形鱼叉鱼目前占“白马林鱼”总捕获量的很大比例（接近27%），在该区域内具有很高的空间差异。因此，目前关于白马林鱼的生物学知识的准确性，其中一些已经形成了过去种群状态建模的输入，由于错误识别而受到“污染”。在北大西洋西部进行了种群评估模拟，其中包括圆形鱼叉鱼的比例（27%）；这表明，两种物种比例的历史变化，以及褐飞蛾和褐飞蛾种群增长率的差异，都会影响模拟结果。我们的研究结果表明，物种之间的错误识别可能影响了过去北大西洋西部褐飞蛾种群评估的准确性，因此需要重新访问以改善该物种的管理和恢复。此外，还建议收集新生活史资料，以证实历史研究的结果。
The white marlin Tetrapturus albidus (Istiophoridae) is considered to be among the most overexploited species under international management jurisdiction in the Atlantic Ocean, resulting in diverse stakeholder concerns. Efforts have been made to add it to the US Endangered Species List. Its population status has become uncertain with the realization that: (1) longstanding misidentifications of white marlin have occurred with the recently recognized, morphologically similar and sympatric roundscale spearfish T georgii; and (2) the 2 species have unknowingly been assessed and managed as a species group. We show that roundscale spearfish currently constitute a substantial proportion (similar to 27%) of the overall 'white marlin' catch in the western North Atlantic, with high spatial variation within this region. Consequently, the accuracy of current biological knowledge on white marlin, some of which has formed the input for past population status modeling, is compromised by 'contamination' due to misidentification. Population assessment simulations in the western North Atlantic incorporating the proportion of roundscale spearfish (27%) were run; these indicated that historical changes in the ratio of the 2 species, as well as differences in the population growth rates between T albidus and T georgii, affect simulation results. Our findings suggest misidentifications between the species may have affected the accuracy of past T albidus population assessments in the western North Atlantic, which therefore need re-visiting to permit improved management and recovery of this species. New collection of life history data for T albidus and T georgii is also recommended to corroborate the results of historical studies.