Effects of observer swimming speed on sample counts of temperate rocky reef fish assemblages
Effects of observer swimming speed on sample counts of temperate rocky reef fish assemblages
复制标题
观察者游泳速度对温带岩礁鱼类组合样本计数的影响
DOI：
10.3354/meps043223
复制
发表时间：
1988
影响因子：
2.5
通讯作者：
M. Smith
中科院分区：
文献类型：
--
作者：
M. Smith
针对澳大利亚东部温带岩礁鱼类群落，研究了观察者在水下横断面游泳的速度对鱼类丰度估计的影响。观察者速度对样本计数具有重要但不同的影响。在相对较快的观察速度下，小型或神秘的鱼类被严重低估，因为没有足够的时间来彻底搜索它们。然而，一些高度流动的物种在低速时被高估，因为它们在计数期间穿过横断面，或者由于无意的重复计算。鱼藤酮样本证实，无论观察者的速度如何，高度隐秘的物种在很大程度上都会被目视普查所忽视。建议在调查设计中对观察者的速度进行标准化。讨论了提高视觉测量精度和准确性的其他建议。
Effect on estimates of fish abundance of speed at which an observer swlms an underwater transect was studied for a temperate rocky reef fish community in eastern Australia. Observer speed had a cntical though differential effect upon sample counts. Small or cryptic fishes were severely underestimated at relatively fast observer speeds because not enough time was available to search thoroughly for them. Some highly mobile species, however, were overestimated at slow speeds, due to their movement across the transect during counting penods, or to inadvertent double counting. Rotenone samples confirmed that, regardless of observer speed, highly cryptic species are largely overlooked by visual census It is suggested that observer speed should be standardzed in survey designs. Other suggestions for improving precision and accuracy of visual surveys are discussed.