MORTALITY AND RECRUITMENT OF PACIFIC SARDINE, SARDINOPS-SAGAX-CAERULEA, LARVAE IN THE CALIFORNIA CURRENT
MORTALITY AND RECRUITMENT OF PACIFIC SARDINE, SARDINOPS-SAGAX-CAERULEA, LARVAE IN THE CALIFORNIA CURRENT
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DOI：
10.1139/f91-203
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发表时间：
1991-09-01
影响因子：
2.4
通讯作者：
BUTLER, JL
中科院分区：
文献类型：
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作者：
BUTLER, JL
1951 ~ 1967年，太平洋沙丁鱼（Sardinops sagax caerulea）幼鱼（< 20 d）的死亡率呈上升趋势，这种上升趋势与北方鳀（Engraulis mordax）生物量的增加呈正相关。 其他潜在的相关性与幼虫沙丁鱼死亡率进行了检查，使用多重相关。 这些包括温度和浮游动物量在站积极的沙丁鱼幼虫，水柱稳定性，上升流，运输，盐度异常，和太平洋鲭鱼，鲭鱼，丰度。 无显著贡献的多元回归与富马酸盐。 因此，没有证据存在无论是拉斯克的稳定海洋假说的幼虫死亡率或Hjort的幼虫运输假说。 沙丁鱼新兵在2岁的产卵生物量的比率的对数被用作招募成功的指数。 沙丁鱼招聘成功在2岁是不相关的幼虫死亡率。 沙丁鱼招聘，但是，与北方鲱鱼生物量和太平洋沙丁鱼，太平洋鲭鱼，和北方鲱鱼的生物量的总和呈负相关。 对这一结果的一个合理解释是，中上层鱼类的捕食导致沙丁鱼幼虫和幼鱼的死亡率更高，从而减少沙丁鱼的招聘。
The mortality rates of Pacific sardine, Sardinops sagax caerulea, larvae (< 20 d) increased during 1951-67, and this increase was positively correlated with the increase in biomass of northern anchovy, Engraulis mordax. Other potential correlates with larval sardine mortality rates were examined using multiple correlation. These included temperature and zooplankton volumes at stations positive for sardine larvae, water column stability, upwelling, transport, salinity anomalies, and Pacific mackerel, Scomber japonicus, abundance. None contributed significantly to the multiple regression with anchovy abundance. Thus, no evidence existed for either Lasker's stable ocean hypothesis of larval mortality or Hjort's larval transport hypothesis. The logarithm of the ratio of sardine recruits at age 2 to the spawning biomass was used as an index of recruitment success. Sardine recruitment success at age 2 was not correlated with larval mortality rates. Sardine recruitment, however, was negatively correlated with both northern anchovy biomass and the combined biomass of Pacific sardine, Pacific mackerel, and northern anchovy. A plausible explanation for this result is that predation by pelagic fishes results in greater mortality rates of sardine larvae and juveniles which in turn decrease sardine recruitment.