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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Revisiting cross-shelf transport of Dungeness crab (Metacarcinus magister) megalopae by the internal tide using 16 years of daily abundance data
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Revisiting cross-shelf transport of Dungeness crab (Metacarcinus magister) megalopae by the internal tide using 16 years of daily abundance data

机译：通过内部潮汐使用16年的日常丰度数据，重新审视肿瘤蟹（Metacarcinus Magister）巨大的交叉架运输

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摘要

Many marine organisms have a biphasic life beginning with a planktonic larva that undergoes development on the continental shelf. These larvae ultimately need to return to the nearshore environment to settle. One proposed mechanism of transport to the nearshore is the internal tide. The Dungeness crab, Metacarcinus (Cancer) magister, is one species that is hypothesized to be transported by the internal tide. In addition to daily cycles in catch of megalopae being correlated with the internal tide, the annual catch of megalopae is correlated with the Pacific Decadal Oscillation. However, intial studies occurred during a positive phase Pacific Decadal Oscillation. In this study, we analyze an additional 12 years of data (16 years total) to determine if the internal tide continues to be correlated with the transport of Dungeness crab megalopae. We used wavelet analyses and cross-Fourier analysis to relate the catch of megalopae to the daily maximum tidal range, wind speed, and sea surface temperature. We found that over 16 years, the correlation with the daily maximum tidal range continues to be the strongest correlate with the daily catch of megalopae. These results continue to suggest megalopae are transported across the continental shelf by the internal tide. Our use of wavelets allowed us to examine the annual trends in periodicity of returning megalopae. We found that the periodicities at tidal frequencies did not persist throughout the settlement season. We hypothesize this indicates cross-shelf transport is primarily regulated by the internal tide but additional, unknown factors, interact with the internal tide affecting the number of returning larvae. We conclude by discussing why high-frequency sampling is an important component of ecological time series.
机译：许多海洋生物有双相生活，从浮游生物幼虫开始，在大陆架上进行开发。这些幼虫最终需要返回到近岸环境来解决。一个拟议的运输机制到近岸是内部潮流。 Dengenty Crab，Metacarcinus（癌症）鼹鼠是一个假设的一个物种，被内部潮汐运输。除了百血大口的日常循环外，巨大的潮汐相关，巨大的百血能与太平洋横向振荡相关。但是，在正期太平洋横向振荡期间发生了初始研究。在这项研究中，我们分析了另外12年的数据（16年总计），以确定内部潮汐是否继续与肿瘤蟹巨大的运输相关。我们使用小波分析和交叉傅里叶分析，将麦克拉皮的捕获与日常最大潮汐范围，风速和海表面温度相关联。我们发现超过16年，与日常最大潮汐范围的相关性仍然是与巨大捕获的最强烈的相关性。这些结果继续提示巨大的潮汐通过内部潮汐在大陆架上运输。我们的使用小波使我们能够检查百血大口的周期性趋势。我们发现潮汐频率的周期性在整个结算季节并不持续存在。我们假设这表明跨货架运输主要由内部潮汐调节，而是额外的，未知因素，与影响幼虫数量的内部潮汐相互作用。我们通过讨论为什么高频抽样是生态时间序列的重要组成部分。

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