Acoustically derived fish size-spectra within a lake and the statistical power to detect environmental change.
Acoustically derived fish size-spectra within a lake and the statistical power to detect environmental change.
复制标题
湖泊内的声学鱼类大小光谱和检测环境变化的统计能力。
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Milne
中科院分区：
文献类型：
--
作者：
D. Kerckhove;B. Shuter;S. Milne
渔业声学调查越来越多地被用来监测鱼类种群的丰度，但将其作为监测群落规模谱变化的工具还没有得到很好的探索。在这项研究中，我们利用对Opeongo湖三个海湾的远洋带的一系列历史声学调查，以确定是否可以有效地测量和使用声学派生的尺寸谱指标(坡度和高度)作为监测工具。每次调查都成功地测量了声学尺寸谱指标，并与净额调查中发现的指标相似。从2005年到2009年，体型谱的斜率变得更浅，可能是因为成群的猎物鱼的数量减少。对调查差异来源的估计，包括鱼类大小估计和流域间差异，都很低(10%的变异系数)，这表明监测方案将在10年内发现尺寸谱斜率在2%至15%之间的年度变化。尺寸-光谱高度不是很高。
Fisheries acoustic surveys are increasingly being used to monitor the abundance of fish stocks, yet their adoption as a tool to monitor changes in community size spectra has not been well explored. In this study, we use a series of historical acoustic surveys of the pelagic zones of three arms of Lake Opeongo to determine if acoustically derived size-spectra indicators (slope and height) can be effectively measured and used as a monitoring tool. Acoustic size-spectra indicators were successfully measured for every survey and resembled the same indicators found in netting surveys. From 2005 to 2009, the slope of the size spectra became shallower, likely due to a decrease in abundance in schooling prey fish. Estimates of sources of survey variation, including fish size estimates and interbasin differences, were low (<10% coefficients of variation), suggesting that monitoring programs would detect annual changes in the size-spectra slopes ranging from 2% to 15% within 10 years. Size-spectra heights did not c...