MIGRATORY PATTERN AND HABITAT USE OF TROPICAL EELS ANGUILLA SPP. (TELEOSTEI: ANGUILLIFORMES: ANGUILLIDAE) IN THE PHILIPPINES, AS REVEALED BY OTOLITH MICROCHEMISTRY
MIGRATORY PATTERN AND HABITAT USE OF TROPICAL EELS ANGUILLA SPP. (TELEOSTEI: ANGUILLIFORMES: ANGUILLIDAE) IN THE PHILIPPINES, AS REVEALED BY OTOLITH MICROCHEMISTRY
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热带鳗鲡的洄游模式和栖息地利用。
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
W. Tzeng
中科院分区：
文献类型：
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作者：
A. A. Briones;A. V. Yambot;J. Shiao;Y. Iizuka;W. Tzeng
为了确定菲律宾淡水鳗鱼的迁移模式和栖息地利用，我们分析了锶钙（Sr：Ca）的耳石的比例与使用的电子探针显微分析仪（EPMA）。耳石Sr：Ca比值的变化反映了鳗鱼在不同盐度梯度间的迁移模式。从菲律宾吕宋岛北方的奇科河和卡加延河共采集了22条鳗鱼。根据耳石中锶和钙的含量，在幼鳗期以后，鳗鲡的洄游模式可分为3种类型：1）淡水型，以8只花鳗鲡和3只白鳗鲡为代表; 2）2型（海洋型），以2个A. bicolor pacifica标本; 3）3a型（河口淡水型）; marmorata和四个A. bicolor bicolor标本和3b型（河口喜海型）。bicolor bicolor和3个A.太平洋双色标本。结果表明，菲律宾热带鳗鱼生长期（黄鳗期）广泛分布于海水、半咸水和淡水环境。通过耳石Sr：Ca比值和微结构分析，可以重建菲律宾淡水鳗从高盐海洋环境向河流中低盐淡水环境的洄游过程。这项研究是第一次使用耳石微量化学追踪菲律宾鳗鱼的迁移和环境历史。
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.