Introduction of geospatial perspective to the ecology of fish-habitat relationships in Indonesian coral reefs: A remote sensing approach
Introduction of geospatial perspective to the ecology of fish-habitat relationships in Indonesian coral reefs: A remote sensing approach
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将地理空间视角引入印度尼西亚珊瑚礁鱼类与栖息地关系的生态学：遥感方法
DOI：
10.1007/s12601-015-0032-2
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发表时间：
2015
影响因子：
1.3
通讯作者：
T. Komatsu
中科院分区：
文献类型：
--
作者：
Shuhei Sawayama;N. Nurdin;M. Akbar AS;S. Sakamoto;T. Komatsu
全世界的珊瑚礁生态系统现在正受到鱼类栖息地退化带来的各种压力的损害，因此迫切需要了解鱼类与栖息地关系的知识。由于缺乏地理空间视角，传统的研究方法无法实现这一目的，因此我们尝试开发一种将视觉鱼类观察与海底栖息地地图相结合的研究方法，并将知识扩展到二维尺度。对 2012 年 9 月获得的印度尼西亚斯佩蒙德群岛 WorldView-2 卫星图像进行了分析，并将其分为四种典型基质：活珊瑚、死珊瑚、海草和沙子。该图的总体分类准确率为 81.3%，对于后续分析来说足够精确。从地图中提取了珊瑚礁斜坡周围的三个子区域（CC：连续珊瑚礁，BC：珊瑚礁边界和FC：少量活珊瑚区）。 2013年6月，在每个分区内对几种鱼类进行了目视横断面调查。结果，被称为珊瑚的专性饲养者的Chaetodon octofasciatus的平均密度（Ind. / 300 m2）在BC显着高于其他区域（p < 0.05），这意味着该物种的密度受到其栖息地空间配置的强烈影响，如“边缘效应”。这表明未来珊瑚礁鱼类的保护程序不仅应考虑珊瑚覆盖，还应考虑其空间配置。本研究还表明，引入源自遥感的地理空间视角对于推进珊瑚礁鱼类的常规生态研究具有巨大潜力。
Coral reef ecosystems worldwide are now being harmed by various stresses accompanying the degradation of fish habitats and thus knowledge of fish-habitat relationships is urgently required. Because conventional research methods were not practical for this purpose due to the lack of a geospatial perspective, we attempted to develop a research method integrating visual fish observation with a seabed habitat map and to expand knowledge to a two-dimensional scale. WorldView-2 satellite imagery of Spermonde Archipelago, Indonesia obtained in September 2012 was analyzed and classified into four typical substrates: live coral, dead coral, seagrass and sand. Overall classification accuracy of this map was 81.3% and considered precise enough for subsequent analyses. Three sub-areas (CC: continuous coral reef, BC: boundary of coral reef and FC: few live coral zone) around reef slopes were extracted from the map. Visual transect surveys for several fish species were conducted within each sub-area in June 2013. As a result, Mean density (Ind. / 300 m2) ofChaetodon octofasciatus, known as an obligate feeder of corals, was significantly higher at BC than at the others (p < 0.05), implying that this species’ density is strongly influenced by spatial configuration of its habitat, like the “edge effect.” This indicates that future conservation procedures for coral reef fishes should consider not only coral cover but also its spatial configuration. The present study also indicates that the introduction of a geospatial perspective derived from remote sensing has great potential to progress conventional ecological studies on coral reef fishes.