Selecting Piscivorous Bird Species for Monitoring Environmental Change in the Banc d'Arguin, Mauritania
Selecting Piscivorous Bird Species for Monitoring Environmental Change in the Banc d'Arguin, Mauritania
复制标题
选择食鱼鸟类来监测毛里塔尼亚阿尔金湾的环境变化
作者：
J. Veen;Hanneke Dallmeijer;Thor Veen
本研究的目的是选择食鱼鸟类物种作为指标，以监测鱼类多样性的变化，在银行的阿尔甘，毛里塔尼亚。这样的物种应该有一个高的饮食多样性，低饮食重叠和数据应该很容易收集。我们比较了五个殖民地筑巢鸟类物种的饮食在银行d'Arguin：细嘴银鸥、里海燕鸥和皇家燕鸥是正在进行的监测计划的一部分，以及白胸鸬鹚Phalacrocorax carbo lucidus和白胸琵鹭Platalea leucorodia balsaci作为潜在的新成员。所有物种在猎物物种组成、猎物物种多样性和猎物大小方面差异很大。食物重叠指数在0.05和0.69之间变化，最高的重叠值之间的美洲琵鹭和细嘴鸥。这些物种在促进饮食隔离的生态和行为机制方面存在重大差异，例如觅食栖息地的使用、觅食范围和捕食技术。我们的结论是，调查的物种很好地服务于我们的监测目标。给出了实施监测方案的实际建议。
This study aims to select piscivorous bird species to be used as indicators to monitor changes in fish diversity at the Banc d'Arguin, Mauritania. Such species should have a high diet diversity, low dietary overlap and data should be easy to collect. We compared the diets of five colony nesting bird species at the Banc d'Arguin: the Slender-billed Gull Chroicocephalus genei, Caspian Tern Hydroprogne caspia and Royal Tern Thalasseus maximus albididorsalis, which are part of an ongoing monitoring program, and the White-breasted Cormorant Phalacrocorax carbo lucidus and Mauritanian Spoonbill Platalea leucorodia balsaci as potential new additions. All species considerably differed in prey species composition, prey species diversity and prey size. Diet overlap indices varied between 0.05 and 0.69 with the highest overlap values between Mauritanian Spoonbill and Slender-billed Gull. There are major differences between the species in ecological and behavioural mechanisms promoting diet segregation, such as foraging habitat use, foraging ranges and prey-catching techniques. We conclude that the species investigated serve our monitoring goal well. Practical recommendations for the implementation of a monitoring program are given.