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首页> 外文期刊>ICES Journal of Marine Science >Corroboration and refinement of a method for differentiating landings from two stocks of Pacific sardine (Sardinops sagax) in the California Current
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Corroboration and refinement of a method for differentiating landings from two stocks of Pacific sardine (Sardinops sagax) in the California Current

机译：验证和完善一种区分加利福尼亚当前洋中太平洋沙丁鱼（Sardinops sagax）种群的着陆方法的方法

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摘要

Efforts to survey, assess and manage Pacific sardine (Sard'mops sagax) in the California Current may depend on accurate differentiation of the purported two migrating stocks. The southern stock spans seasonally from southern Baja California, Mexico to Point Conception, California; the northern stock spans seasonally from Punta Eugenia, Mexico northwards to southern Alaska. Their seasonal north-south migrations are approximately synchronous within their respective domains, resulting in segregated spawningand different identities. A decade ago, a practical method was proposed for differentiating landings from the two stocks using concomitant measurements of sea-surface temperature (SST). Here, we corroborate and refine the method using regional indices of optimal and good potential habitat for the northern stock, and SST-based indices associated with the 99.9 and 100% confidence intervals of the potential habitat. For months when the index is ＜ 0.5, (i.e. when the minority of a fishing region probably includes potential northern stock habitat), the landings are attributed to the southern stock, and vice versa. We applied this method to regional monthly landings data from 2006-2011 and the results indicated that an average of 63 - 72 and 32 - 36% of the summertime landings at Ensenada, Mexico and San Pedro, southern California were probably from the southern stock, respectively, depending on the index used. Allocation error could be reduced if the landings were evaluated on finer spatio-temporal scales, particularly during habitat-transition periods. Our method may be used to improve estimates of northern stock biomass, spatial and length distributions, recruitment, and mortality.
机译：在加利福尼亚州进行调查，评估和管理太平洋沙丁鱼（Sard'mops sagax）的工作可能取决于所称的两个迁徙种群的准确区分。从南部的墨西哥下加利福尼亚州到加利福尼亚的Point Conception，南部种群季节性分布。北部种群季节性分布，从墨西哥的蓬塔尤金尼亚（Punta Eugenia）向北延伸至阿拉斯加南部。它们的季节性南北迁徙在各自的域内大致同步，从而导致产卵隔离和身份不同。十年前，有人提出了一种实用的方法，通过同时测量海表温度（SST）来区分两种种群的着陆量。在这里，我们使用北部种群最佳和良好潜在生境的区域指数以及与潜在生境的99.9和100％置信区间相关的SST指数来证实和完善该方法。对于指数≤0.5的月份（即某个捕鱼区域的少数地区可能包括潜在的北部种群栖息地），上岸次数应归因于南部种群，反之亦然。我们将此方法应用于2006-2011年的区域月度着陆数据，结果表明，墨西哥的恩塞纳达和加利福尼亚南部的圣佩德罗平均有63％至72％和32％至36％的夏季着陆可能来自南部种群，分别取决于所使用的索引。如果在更好的时空尺度上评估着陆，尤其是在生境转变时期，可以减少分配错误。我们的方法可用于改善北部种群生物量，空间和长度分布，补充和死亡率的估计。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第2期|328-335|共8页
  • 作者

    David A. Demer; Juan P. Zwolinski;

  • 作者单位

    Fisheries Resources Division, Southwest Fisheries Science Center (SWFSC), National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 8901 La Jolla Shores Drive, San Diego, CA, 92037, USA;

    Ocean Associates Inc. (contracted to SWFSC), 4007 North Abingdon Street, Arlington, Virginia, 22207, USA , Institute of Marine Sciences, University of California, Santa Cruz, Earth & Marine Sciences Building Rm A317, Santa Cruz, CA 95064;

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  • 正文语种 eng
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  • 关键词

    abundance; biomass; differentiation; distribution; exploitation; mortality;

    机译：丰富;生物质分化分配;开发;死亡;

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