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Changes in community structure of finfish catches in Brunei Darussalam between 2000 and 2009

机译：2000年至2009年间文莱达鲁萨兰国有鳍鱼类捕获群落结构的变化

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摘要

Commercial fishery catches in Brunei Darussalam between 2000 and 2009 were used to examine changes in community structure of Brunei's marine ecosystem - a relatively lightly harvested system within a region chronically overexploited by fisheries. We found that Mean Trophic Level (MTL) has declined at a rate of 0.08 trophic levels (TL) per decade, suggesting a 'fishing down the marine food web' process in Brunei waters. In order to focus on changes in relative abundance of the more threatened, higher TL finfish only, MTL was recalculated as ~(3.30)MTL (to exclude catches of finfish and invertebrates species with TL less than 3.30). Here, we found no overall trend in the ~(3.30)MTL over the study period. However, a more in-depth analysis suggested that MTL fails to capture substantial changes in underlying species assemblage. Over the course of the study period, marked changes in fish community structure were observed. Analysis of official statistics showed an increase in total catch was driven primarily by an increase in pelagic catches, with a similar trend observed when the catches were aggregated into either high- or low-TL This pattern is consistent with the increasing Fishing-in-Balance (FiB) index for the Brunei region. Whilst our study was not aimed at demonstrating overfishing as the cause of observed trends, there is a danger that current best practice fails to detect what may be an imminent fishery collapse. In many fisheries around the world, there is a need for detection methods able to identify potential problems within a time scale short enough to be able to react effectively.
机译：文莱达鲁萨兰国（2000-2009年）的商业捕鱼量被用来研究文莱海洋生态系统的群落结构变化。文莱海洋生态系统是一个被渔业长期过度开采的区域内相对较轻的捕捞系统。我们发现平均营养水平（MTL）以每十年0.08个营养水平（TL）的速度下降，这表明文莱水域“垂钓海洋食物网”的过程。为了仅关注受威胁程度更高，TL较高的有鳍鱼类的相对丰度变化，将MTL重新计算为〜（3.30）MTL（不包括TL小于3.30的鳍鱼和无脊椎动物的捕获量）。在这里，我们没有发现整个研究期间〜（3.30）MTL的总体趋势。但是，更深入的分析表明，MTL无法捕获基础物种组合的实质性变化。在研究期间，观察到鱼类群落结构发生了明显变化。对官方统计数据的分析表明，总捕获量的增加主要是由远洋捕获量的增加驱动的，当将捕获量汇总为高TL或低TL时也观察到类似的趋势。 （FiB）汶莱地区的指数。尽管我们的研究并非旨在证明过度捕捞是观察到的趋势的原因，但存在一种危险，即目前的最佳做法无法发现可能即将到来的渔业崩溃。在世界各地的许多渔业中，需要能够在短时间内识别出潜在问题的检测方法，以便能够有效地做出反应。

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  • 来源
    《Ocean & coastal management》 |2013年第5期|45-51|共7页
  • 作者

    Syazana Ebil; Charles R.C. Sheppard; Ranimah Wahab; Andrew R.G. Price; James C. Bull;

  • 作者单位

    School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK;

    School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK;

    Marine Fisheries Development and Management Division, Department of Fisheries, Ministry of Industry and Primary Resources, Brunei Darussalam;

    School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK,Environment Department, University of York, York YO10 5DD, UK;

    School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK;

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