https://scholars.lib.ntu.edu.tw/handle/123456789/330352
標題: | Migratory pattern and habitat use of tropical eels anguilla spp. (Teleostei: Anguilliformes: Anguillidae) in the philippines, As revealed by otolith microchemistry | 作者: | JEN-CHIEH SHIAO | 關鍵字: | Catadromous; Eels; Life history; Migratory pattern; Otolith microchemistry; Sr:Ca ratio | 公開日期: | 2007 | 卷: | 2014 | 起(迄)頁: | 141-149 | 來源出版物: | Raffles Bulletin of Zoology | 摘要: | To determine the migratory pattern and habitat use of freshwater eels in the Philippines, we analyzed the strontium to calcium (Sr:Ca) ratio of their otoliths with the use of an electron probe microanalyzer (EPMA). The changes in the otolith Sr:Ca ratios reflect the migratory pattern of the eels between different salinity gradients. A total of 22 eels were collected from the Chico and Cagayan Rivers in Northern Luzon, the Philippines. Beyond the elver stage, the migratory pattern of the eels diversified into three types as inferred by the concentrations of strontium and calcium in the otoliths: 1) Type 1 (freshwater type) represented by eight Anguilla marmorata and three A. bicolor bicolor specimens; 2) Type 2 (marine type) represented by two A. bicolor pacifica specimens; 3) Type 3a (estuarine but freshwater-favouring type) by one A. marmorata and four A. bicolor bicolor specimens and Type 3b (estuarine but marine-favouring type) by one A. bicolor bicolor and three A. bicolor pacifica specimens. The results indicated that the tropical eels in the Philippines are widely distributed in marine, brackish and freshwater environments during the growth phase (yellow stage). Through the otolith Sr:Ca ratios and microstructure analysis, it was possible to reconstruct the migratory movements of the Philippine freshwater eels from the high-saline marine environment to the low-saline freshwater environment in the rivers. This study is the first to use otolith microchemistry in tracing the migratory and environmental history of the eels in the Philippines. © 2007, National University of Singapore. All rights reserved. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-77949906288&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/330352 |
SDG/關鍵字: | Anguillidae; Anguilliformes; Teleostei |
顯示於: | 海洋研究所 |
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