Citizen science frontiers horseshoe crab population regain at their spawning beach in East Peninsular Malaysia
Citizen science frontiers horseshoe crab population regain at their spawning beach in East Peninsular Malaysia
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DOI：
10.1016/j.jenvman.2018.12.002
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发表时间：
2019-02-15
影响因子：
8.7
通讯作者：
Chowdhury, Ahmed Jalal Khan
中科院分区：
文献类型：
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作者：
Zauki, Nurul Ashikin Mat;Satyanarayana, Behara;Chowdhury, Ahmed Jalal Khan
圆尾蟹和太平洋鲎可能在其他地方共存并共享共同的产卵场，但在马来西亚半岛东海岸的俾路支，圆尾蟹和太平洋鲎可能在其他地方共存并共享共同的产卵场。rotundicauda是一个未被充分研究的物种。由于其产卵场难以到达，个体较小，商业价值较低，因此被忽视。gigas，而且，从野外获得的困难使C。Balok的圆尾龙种群状况仍不明。这种观点推动了目前的尝试，因为人类活动，如结构放置和采矿是径流的点源，将沉积物加载到Balok河。虽然侵蚀-加积事件改变了Balok河的宽度，但Balok海滩的海岸沉积物在2012年至2016年期间在中细砂和细砂之间过渡。到2016年，C。在沿着这条面向南海的走廊200 ~ 1000 m范围内，有91个圆尾类巢产卵5117枚。由此产量，C.在西南季风期，圆尾轮虫在56个巢中产卵2880枚，在东北季风期，在19个巢中产卵1254枚，在季风间期，在16个巢中产卵983枚。女性C。圆尾虫选择在较低的海岸线上的浅洞产卵，没有侵蚀和大量的泥沙和粘土（> 20%）沉积有利于C。圆尾鱼胚胎发生与短期的温度和盐度冲击在白天的下降潮汐。这鼓励了C。在Balok海滩，圆尾鱼的数量不断增加，每两个月产卵一次。简而言之，海岸恢复倡议，如系统的船只对接，适当处理渔网和废物，以及定期捕鱼作业，有效地领导了Balok渔民公民科学家。这一成功的社区联合合作证明，由公民主导的对退化海滩的养护提供了海洋生物保护，对于沿海地区的管理是切实可行的，特别是在海龟和鳄鱼等其他卵生动物栖息的地区。
Carcinoscorpius rotundicauda and Tachypleus gigas may co-exist and share common spawning grounds elsewhere but at Balok (East Coast of Peninsular Malaysia), C. rotundicauda is an understudied species. Neglected as research candidate because of inaccessible spawning grounds, smaller size and less commercial value than T. gigas and also, difficulty to attain from the wild has made C. rotundicauda population status remaining unidentified at Balok. This standpoint drove the present attempt because anthropic activities like structure placement and mining are point-source for runoffs that load sediments into Balok River. While erosion-accretion events have altered Balok River width, the shore sediments in Balok Beach were transitioned between medium-fine and fine sand between years 2012 and 2016. Eventually by year 2016, the C. rotundicauda were depositing 5117 eggs in 91 nests from 200 to 1000 m range along this corridor facing South China Sea. From this yield, C. rotundicauda released 2880 eggs in 56 nests during the Southwest monsoon, 1254 eggs in 19 nests during the Northeast monsoon and 983 eggs in 16 nests during the Inter-monsoon seasons. Though female C. rotundicauda opted to lay their eggs in shallow burrows at lower shorelines, the absence of erosion and substantial silt and clay (> 20%) deposition facilitates C. rotundicauda embryogenesis with brief periods of temperature and salinity shocks during day-time falling tides. This encourages C. rotundicauda to emerge with increasing abundance and carry out bimonthly spawning at Balok Beach. In short, shore restoration initiatives like systematic boat docking, proper disposal of nets and waste and, periodic fish-catching operations were effectively led by the Balok fisher citizen scientist. This successful community joint-cooperation proves that citizen-led caretaking of degraded beaches offers marine life protection and are practical for coastal area management especially at areas where other oviparous animals such as turtles and crocodiles are harboured.