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首页> 外文期刊>ICES Journal of Marine Science >Identifying possible drivers of the abrupt and persistent delay in capelin spawning timing following the 1991 stock collapse in Newfoundland, Canada
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Identifying possible drivers of the abrupt and persistent delay in capelin spawning timing following the 1991 stock collapse in Newfoundland, Canada

机译：在加拿大纽芬兰的1991年股票崩溃之后，识别卡塞林产卵时间突然和持续延迟的可能驱动因素

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摘要

Spawning timing in fish is generally cyclical in temperate regions in order to increase the probability of matching larval occurrence with ideal environmental conditions. The capelin stock in Northwest Atlantic Fisheries Organization Divisions 2J3KL collapsed in 1990-1991 and has not recovered. This collapse was concomitant with collapses in groundfish stocks and cold oceanographic conditions. Using citizen science data, newspaper archives, grey and primary literature, and monitoring data, a century of capelin beach spawning times were compiled. Capelin beach spawning has been persistently 3 weeks later since the stock collapse. To identify potential predictors of capelin spawning timing, an exploratory analysis was conducted using environmental and biological variables and a period factor that categorized a year as either pre-collapse (1990 and earlier) or post-collapse (post-1990) in a step-wise multiple regression model. Spawning timing was predicted to be delayed in the post-collapse period when there were negative anomalies in the Newfoundland and Labrador Climate Index and summer (June-August) North Atlantic Oscillation, and when there was a decrease in mean length of the spawning population. The production of weak year-classes is predicted when spawning is delayed, suggesting that late spawning is severely inhibiting the recovery of the stock.
机译：在鱼类中产卵时序通常是气候区域的周期性，以提高与理想的环境条件相匹配幼虫发生的可能性。西北大西洋渔业组织部门的羊毛林库存2J3KL于1990年至1991年崩溃，尚未康复。这种崩溃伴随着荒鱼股票和寒冷的海洋学条件崩溃。使用公民科学数据，报纸档案，灰色和主要文学，以及监测数据，卷积产卵海滩产卵时间。卡佩林海滩产卵自股票崩溃以来一直持续3周后一直持续3周。为了识别Capelin产卵时间的潜在预测因子，使用环境和生物变量进行探索性分析以及将每年分类为每年的时期因素（1990及更早）或逐步崩溃（1990年后）进行分类明智的多元回归模型。当纽芬兰和拉布拉多气候指数和夏季（八月）北大西洋振荡中存在阴性异常时，预计产卵时间将被推迟在崩溃后期，并且当产卵人口的平均长度下降时，当人口的平均长度下降时。当产卵延迟时预测弱年级的生产，表明晚些时候产卵严重抑制了股票的恢复。

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