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Using citizen science and survey data to determine the recruitment envelope of the giant clam, Tridacna gigas (Cardiidae: Tridacninae)
Ocean & Coastal Management ( IF 4.8 ) Pub Date : 2021-01-04 , DOI: 10.1016/j.ocecoaman.2020.105515
Jeremiah Noelle C. Requilme , Cecilia Conaco , Sherry Lyn G. Sayco , Hilly Ann Roa-Quiaoit , Patrick C. Cabaitan

Restocking of giant clams, particularly Tridacna gigas, aims to reestablish breeding populations that have long been decimated by overexploitation. In Camiguin, southern Philippines, T. gigas juveniles that were restocked in 2001 have reached reproductive maturity and recruits have been observed on the reefs. To help document T. gigas recruits in Camiguin, the Cantaan Centennial Multi-purpose Cooperative (CCMPC) initiated a program to encourage local fishers to report any sightings of giant clams, in the surrounding reefs. The fishers would mark the location of any giant clam recruits they encountered during their regular fishing trips using makeshift buoys. Personnel from CCMP would then visit the marked sites to collect GPS data. The giant clams would later be relocated to an ocean-based nursery at the CCMP marine protected area (MPA) to ensure their protection. A total of 26 T. gigas recruits with a mean shell length of 17.8 ± 1.5 cm were found 0.2 km–2.3 km away from the restocking site between 2015 and 2017. Twenty-three of these individuals were reported by fishers while 3 were encountered during field surveys. It is highly probable that these T. gigas recruits are the progeny of the restocked individuals because there are no local populations of wild T. gigas in the area and no artificial spawning events had been conducted at the site. These results suggest that the reefs near Camiguin are suitable for giant clam recruitment and indicate that the recruitment envelope of T. gigas can extend up to several kilometers. Importantly, these findings highlight the value of a strong commitment by local organizations and collaboration with fishers as citizen scientists to enhance the sustainability of giant clam conservation efforts.



中文翻译:

利用公民科学和调查数据来确定巨型蛤Tri Tridacna gigas(Cardiidae:Tridacninae)的招聘范围

放养巨蛤,特别是,旨在为那些长期被抽取受到过度重新建立繁殖种群。在菲律宾南部的卡米金,2001年重新放养的巨嘴T(T。gigas)幼体已经达到生殖成熟期,并且在珊瑚礁上发现了新兵。帮助记录T. gigas坎塔恩百年纪念多用途合作社(CCMPC)在卡米金(Camiguin)的新兵发起了一项计划,以鼓励当地渔民报告在礁石周围发现的大蛤lam的情况。渔民会使用临时浮标标出他们在常规钓鱼旅行中遇到的任何巨型蛤lam新手的位置。然后,CCMP的人员将访问标记的站点以收集GPS数据。巨蛤随后将被转移到CCMP海洋保护区(MPA)的一个海洋苗圃中,以确保对其进行保护。总计26在2015年至2017年之间,平均壳长为17.8±1.5厘米的新兵被发现在距放养场0.2 km–2.3 km的地方。渔民报告了其中的23个人,而在实地调查中遇到了3个人。这些T的招募者很可能是放养的个体的后代,因为该地区没有本地野生巨嘴。的种群,而且该地点未进行过人工产卵活动。这些结果表明,甘米银附近珊瑚礁适合于巨蚌招聘和表明的招聘信封T.牡蛎可以延伸到几公里。重要的是,这些发现凸显了当地组织的坚定承诺和与作为公民科学家的渔民合作以增强巨型蛤c保护工作可持续性的价值。

更新日期:2021-01-04
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