Reduced barnacle larval abundance and settlement in response to large-scale oceanic disturbances: Temporal patterns, nearshore thermal stratification, and potential mechanisms: Settlement during the “Blob” and El Niño
Reduced barnacle larval abundance and settlement in response to large-scale oceanic disturbances: Temporal patterns, nearshore thermal stratification, and potential mechanisms: Settlement during the “Blob” and El Niño
复制标题
应对大规模海洋扰动的藤壶幼虫丰度和沉降减少：时间模式、近岸热分层和潜在机制：“水滴”和厄尔尼诺现象期间的沉降
DOI：
10.1002/lno.10964
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发表时间：
2018
影响因子：
4.5
通讯作者：
Lentz, Steven J.
中科院分区：
文献类型：
--
作者：
Pineda, Jesús;Reyns, Nathalie;Lentz, Steven J.
我们评估了大规模海洋扰动对丰富的潮间带藤壶定居率的影响。每日或每周的沉降，近岸温度，电流，以及早期藤壶无节幼体和Chthatrius fissuscyprids的丰度在拉霍亚，加州，从2014年被称为“Blob”的大规模温水异常开始，到2015/2016年厄尔尼诺后的1年。我们还测量了超过2年的每周结算率在1997/1998年厄尔尼诺在拉霍亚和两个墨西哥网站。在Blob和2015/2016年厄尔尼诺期间，定居点很低，但在其结束后急剧增加，并且到2017年春季为止，定居率仍然很高。藤壶无节幼体C.在Blob和厄尔尼诺期间，fissuscyprid丰度也很低。近海岸水柱的热分层和高频交叉海岸流的变化，内波活动的措施，在Blob和厄尔尼诺期间下降，但在厄尔尼诺结束时增加。同样，在1997/1998年厄尔尼诺期间，墨西哥各地点的定居率也很低。Blob和厄尔尼诺期间沉降的减少可能与两个因素有关：水柱分层的减少，这可能会影响内孔幼虫运输和幼虫的跨海岸分布，以及早期幼虫丰度的减少，可能与干扰期间较低的生殖产量或较高的无节幼体死亡率有关。
We assessed the effects of large‐scale oceanic disturbances on the settlement rate of an abundant intertidal barnacle. Daily or weekly settlement, nearshore temperature, currents, and abundance of early‐stage barnacle nauplii andChthamalus fissuscyprids were measured in La Jolla, California, from the inception of the large‐scale warm‐water anomaly known as the “Blob” in 2014, to 1 yr following the 2015/2016 El Niño. We also measured over 2 yr of weekly settlement rates during the 1997/1998 El Niño in La Jolla and in two Mexican sites. Settlement was low during the Blob and the 2015/2016 El Niño, but increased dramatically after its end, and rates remained high through spring 2017. Barnacle nauplii andC. fissuscyprid abundances were also low during the Blob and El Niño. Nearshore water column thermal stratification and variability of the high‐frequency cross‐shore currents, a measure of internal wave activity, declined during the Blob and El Niño, but increased at the end of El Niño. Similarly, settlement rates in the Mexican sites were low during the 1997/1998 El Niño. The reduction in settlement during the Blob and El Niño may be related to two factors: a decrease in water column stratification, which can influence internal bore larval transport and the cross‐shore distribution of larvae, and also to reduced early‐stage larval abundance, potentially related to lower reproductive output or high nauplii mortality during the disturbances.