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首页> 外文期刊>ICES Journal of Marine Science >Decadal-scale changes in southern California sciaenids under different levels of harvesting pressure
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Decadal-scale changes in southern California sciaenids under different levels of harvesting pressure

机译：在不同水平的收获压力下，加利福尼亚南部的弯刀类的年代尺度变化

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摘要

A unique 38-year time-series of power-plant entrapment data collected across ～ 170 km of the southern California coastline was examined to describe the decadal-scale trends in common Southern California Bight sciaenid abundance in relation to oceanographic conditions. Adult catches for five of seven species declined at differing rates and severity. Declines of up to 94% were detected in historically common species such as Cenyonemus lineatus, whereas historically less abundant species have increased dramatically, e.g. Umbrina roncador (2626%). Over time, the entrapped community became increasingly influenced by species with more southerly distributions, indicated by a significant decline in the average latitudinal midpoint of the community. This shift was significantly related to rising ocean temperature and took place in the early to mid-1980s. The observed species-specific abundance changes in all species except Atractoscion nobilis were significantly correlated with sea surface temperature, nearshore plankton volumetric biomass, C. lineatus or Seriphus politus nearshore larval density, or a combination of these. Patterns in A. nobilis abundance were the most isolated, likely reflecting its standing as an intensively fished species, unlike the other six species evaluated. The consistent relationship with environmental indices strongly supported the notion of a faunal shift driven by bottom-up forcing.
机译：检查了一个独特的38年时间序列，该数据收集了横跨南加州约170 km的海岸线上的电厂截留数据，以描述与海洋条件有关的常见南加州比克海带丰富度的年代际尺度趋势。七个物种中五个物种的成年捕捞量以不同的速度和严重程度下降。在历史上常见的物种，如仙茅（Cynyonemus lineatus）中，检测到的下降高达94％，而历史上较少的丰富物种却急剧增加，例如翁布丽娜·龙卡多（2626％）。随着时间的流逝，受困的社区越来越受到分布更南端的物种的影响，这表明该社区的平均纬度中点显着下降。这种变化与海洋温度升高显着相关，发生在1980年代初至中期。除白术以外的所有物种中观察到的物种特异性丰度变化均与海面温度，近岸浮游生物体积生物量，C。lineatus或Seriphus politus近岸幼虫密度或这些因素的组合显着相关。与其他评估的六个物种不同，no。a。nobilis丰度的模式最为孤立，可能反映了其作为密集捕捞物种的地位。与环境指数的一致关系有力地支持了由下而上的强迫驱动的动物群转移的观念。

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