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Traditional fishing activities enhance the abundance of selected waterbird species in a wetland in India

机译：传统捕鱼活动增加了印度湿地中某些水鸟物种的丰富度

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BackgroundWaterbirds are globally declining as a result of habitat loss, alteration or degradation. Fishing activities may affect waterbird distribution, abundance and diversity, and traditional fishing activities often enhance waterbird abundance. We tested this hypothesis by studying the abundance and diversity of selected common waterbird species in the Kadalundi–Vallikkunnu Community Reserve, a globally significant wetland in southwestern India in relation to fishing activities. MethodsWe monitored waterbird abundance four times a month from 2012 to 2015 using direct observation method during low tide. Traditional bamboo fish traps were deployed during the first and third weeks of each month. ANOVAs (one-way and multi-way) were used to examine how waterbird counts diversity varied in relation to years, seasons and period of fishing traps. Additionally we conducted a linear regression to examine the relationship between fish occurrence and waterbird counts and diversity. ResultsWaterbird counts varied with years and seasons, with the maximum counts being recorded during the post-monsoon (winter). Individual species varied in their responses to trap deployment. Small waterbird species usually forage in shallow shorelines, increased during trap deployment whereas the larger waterbirds were not affected by trap deployment because they tend to hunt in deeper waters. The total fish captured was an important predictor of both waterbird abundance and diversity. ConclusionIn this study we documented a positive association between traditional fish trap deployment and waterbird counts and diversity. Providing high quality habitats for waterbirds as well as effective sustainable livelihoods through traditional fisheries is a critical management issue.
机译：背景由于栖息地的丧失，改变或退化，水鸟正在全球范围内减少。捕鱼活动可能会影响水鸟的分布，丰度和多样性，而传统捕鱼活动通常会增加水鸟的丰度。我们通过研究Kadalundi–Vallikkunnu社区保护区中选定的常见水鸟物种的丰度和多样性，检验了该假设，该地区是印度西南部与捕鱼活动有关的全球重要湿地。方法我们采用直接观测法在退潮期间从2012年至2015年每月监测水鸟丰度4次。在每月的第一和第三周部署了传统的竹鱼陷阱。方差分析（单向和多向）用于检查水鸟计数多样性如何随捕捞陷阱的年，季节和时期而变化。此外，我们进行了线性回归，以检验鱼的发生与水鸟数量和多样性之间的关系。结果水鸟数量随年份和季节而变化，最大数量记录于季风后（冬季）。个别物种对诱捕器部署的反应各不相同。小水鸟通常在浅岸线觅食，在诱捕器部署期间会增加，而较大的水鸟则不受诱捕器部署的影响，因为它们倾向于在更深的水域捕猎。捕获的总鱼是水鸟丰度和多样性的重要预测指标。结论在这项研究中，我们记录了传统鱼陷阱部署与水鸟数量和多样性之间的正相关。通过传统渔业为水鸟提供高质量的栖息地以及有效的可持续生计是一个至关重要的管理问题。

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