Can long-term content analysis of print media be used to examine species composition, population demography and changes in distributional range of recreational fishery species?
Can long-term content analysis of print media be used to examine species composition, population demography and changes in distributional range of recreational fishery species?
复制标题
印刷媒体的长期内容分析能否用于检查休闲渔业物种的物种组成、种群人口统计和分布范围的变化？
DOI：
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发表时间：
2019
影响因子：
1.2
通讯作者：
A. Childs
中科院分区：
文献类型：
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作者：
W. Potts;T. Jordan;A. Childs
虽然海洋休闲渔业在社会和经济上都很重要，但用于监测和评估的资金往往有限。由于南非垂钓者报告几乎所有目标鱼种的渔获量都下降，而且几乎没有长期监测数据，因此需要探索新的方法，为管理人员提供更多信息。本研究旨在评估印刷媒体记录内容分析的功效，以检测选定休闲渔业物种的物种组成、大小组成和分布的长期趋势。在1960年至2009年期间，从南非最受欢迎的休闲渔业杂志收集了在海洋海岸渔业中捕获的八种鱼类的信息。在这50年中，渔获物的构成发生了变化，从以生长缓慢的大型食肉动物为主转变为以生长较快的大型食肉动物和低营养级物种为主。有没有显着的趋势，在平均值和最大尺寸的优势物种，除了深色的白姑鱼，这在研究期间报告的最大尺寸显着增加。A.结果表明，白纹伊蚊和白纹伊蚊的种群数量显著增加，白纹伊蚊种群数量显著减少。然而，目前还不确定这些趋势是否可以归因于人口变化，垂钓技术和/或行为的变化，或气候信号。总的来说，这种类型的内容分析可能提供一个具有成本效益的方法来检查随着时间的推移，在物种组成和鱼类分布的变化，但是，没有详细的知识，在垂钓者的行为模式的变化，它可能不是有用的了解休闲渔业物种的种群动态变化。有人建议，独立于渔业的监测方案最适合这类复杂的渔业。
Although marine recreational fisheries are socially and economically important, there is often limited funding for their monitoring and assessment. With South African anglers reporting catch declines for almost all targeted species and little long-term monitoring data available, novel methods need to be explored to provide managers with additional information. This study aimed to evaluate the efficacy of content analysis of print-media records for detecting long-term trends in species composition, size composition and distribution of selected recreational fishery species. Information for eight fishes captured in the marine shore-based fishery was collected from South Africa’s most popular recreational fishery magazine, between 1960 and 2009. During the five decades, there were shifts in the catch composition, from being dominated by slow-growing, large predators to faster-growing, large predators and lower-trophic-level species. There were no significant trends in the mean and maximum sizes of the dominant species, except for dusky kob Argyrosomus japonicus, which increased significantly in the maximum size reported during the study period. The distributional range of A. japonicus and leervis Lichia amia significantly increased, and that of galjoen Dichistius capensis significantly decreased. However, it was uncertain whether these trends could be attributed to population changes, changes in angler technology and/or behaviour, or climate signals. Overall, this type of content analysis may provide a cost-effective method to examine changes in species composition and fish distributions over time, but, without detailed knowledge of shifts in angler behavioural patterns, it may not be as useful for understanding changes in the population dynamics of recreational fishery species. It is suggested that fishery-independent monitoring programmes are most suited for this type of complex fishery.