Effect of the Leeuwin Current on the recruitment of fish and invertebrates along the Western Australian coast
Effect of the Leeuwin Current on the recruitment of fish and invertebrates along the Western Australian coast
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DOI：
10.1071/mf9960147
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发表时间：
1996-01-01
影响因子：
1.8
通讯作者：
Chubb, CF
中科院分区：
文献类型：
--
作者：
Caputi, N;Fletcher, WJ;Chubb, CF
与有鳍鱼类相比，西澳大利亚外海无脊椎物种的渔获量相对较高，这与世界其他地区形成鲜明对比，在这些地区，有鳍鱼类的产量通常占主导地位。这种低水平的鳍鱼生产主要是由于Leeuwin海流，其中包括温暖，低营养沃茨流向南部沿着西澳大利亚海岸的大陆架边缘。相比之下，南半球的其他东部边界流（洪堡和本格拉）与向北流动的凉爽、营养丰富的沃茨的上涌以及导致大量鳍鱼生产的高初级生产率有关。Leeuwin海流是西澳大利亚的主要海洋特征，对许多物种的丰度有重大影响。幼虫期是主要受海流影响的阶段，但结果并不总是相同。例如，在西部岩龙虾（Panulirus cygnus）的幼虫阶段，Leeuwin海流的强度具有显著的积极影响。然而，目前有一个负面的影响，在幼虫的扇贝，Amusium balloti，在筲箕湾。同样的中上层鱼类，目前有一个负面影响的幼虫存活的沙丁鱼（沙丁鱼sagax neopilchardus），但银鱼（Hyperlophus vittatus）的积极影响。电流的影响可能的机制包括运输的幼虫和温度对产卵成功率和幼虫的生存和生长的影响。
The relatively high catch of invertebrate species compared with finfish off Western Australia is in sharp contrast to other regions of the world, where finfish production usually dominates. This low level of finfish production is primarily due to the Leeuwin Current, which consists of warm, low-nutrient waters flowing south along the edge of the continental shelf of the Western Australian coast. In contrast, the other eastern boundary currents in the Southern Hemisphere (Humboldt and Benguela) are associated with upwelling of cool, nutrient-rich waters flowing north and the high rates of primary production resulting in a large finfish production. The Leeuwin Current, being the dominant oceanographic feature off Western Australia, has a major influence on the abundance of many species. The larval phase is the stage mainly affected by the current, but not always with the same result. For example, the strength of the Leeuwin Current has a significant positive influence during the larval stage of the western rock lobster (Panulirus cygnus). However, the current has a negative influence during the larval life of the scallop, Amusium balloti, in Shark Bay. Similarly for the pelagic finfish species, the current has a negative effect on larval survival of pilchards (Sardinops sagax neopilchardus) but a positive impact for whitebait (Hyperlophus vittatus). Possible mechanisms for the effect of the current include transportation of larvae and temperature effects on spawning success and on survival and growth of larvae.