Acoustic measures of lake community size spectra
Acoustic measures of lake community size spectra
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湖泊群落大小谱的声学测量
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
G. Rose
中科院分区：
文献类型：
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作者：
L. Wheeland;G. Rose
在加拿大马尼托巴省的Lac du Bonnet (LdB)，采用声学方法测量淡水鱼群落的大小光谱，作为捕获数据的替代方法。在2011年和2012年进行的11次日间水声调查中，可以在LdB内计算鱼类群落的长频频谱。鱼类回波经追踪转换成长度（> ~ 5cm）后形成的尺寸谱均具有显著的线性回归（p值< 0.05，R2值为0.87 ~ 0.99）。鱼类丰度（光谱高度）在2011年（平均±SD = 0.19±0.15）高于2012年（-0.19±0.20），在夏季采样期呈下降趋势。鱼类群落的丰度和大小组成（光谱斜率）在不同水深的三个盆地之间存在差异，最陡的坡度和最低的高度与最浅的水域有关。我们认为，声学衍生的尺寸光谱提供了一种有效的方法来检测和监测水生生态系统中不同时空尺度的鱼类群落动态。
Acoustic methods were tested as an alternative to catch data to measure size spectra of freshwater fish communities in Lac du Bonnet (LdB), Manitoba, Canada. Eleven daytime hydroacoustic surveys conducted in 2011 and 2012 enabled length-frequency spectra of fish communities to be calculated within LdB. Fish echoes tracked and converted to length (>5 cm) formed size spectra with significant linear regressions in all cases (p values < 0.05, R2 values from 0.87 to 0.99). Fish abundance (spectral height) was greater in 2011 (mean ± SD = 0.19 ± 0.15) than in 2012 (–0.19 ± 0.20), decreasing through the summer sampling season. Both abundance and size composition (spectral slope) of fish communities differed between three basins of varying bathymetry, with steepest slopes and lowest heights associated with the shallowest waters. We conclude that acoustically derived size spectra provide an efficient means to detect and monitor fish community dynamics over varied spatial and temporal scales in aquatic ecosystems w...