https://scholars.lib.ntu.edu.tw/handle/123456789/46053
標題: | Can otolith microchemistry reveal whether the blind cave gudgeon, Milyeringa veritas (Eleotridae), is diadromous within a subterranean estuary? | 作者: | Humphreys, W. F. Shiao, Jen-Chieh Iizuka, Yoshiyuki Tzeng, Wann-Nian |
關鍵字: | cavefish;otoliths;pycnocline;anchialine;chemocline;Anchialine; Cavefish; Chemocline; Otoliths; Pycnocline | 公開日期: | 2006 | 卷: | 75 | 期: | 4 | 起(迄)頁: | 439-453 | 來源出版物: | Environmental Biology of Fishes | 摘要: | The blind cavefish, Milyeringa veritas, inhabits an anchialine system, effectively a groundwater estuary, in which salinity varies between fresh and seawater at different locations and depths. Owing to the inaccessible habitat and the threatened status of the cavefish it is hard to obtain the biological information needed for their management. This paper explores the utility of otolith Sr:Ca ratio in elucidating cavefish biology. The mean Sr:Ca ratio of the water inhabited by the cavefish is correlated with both the TDS (total dissolved solids) of the habitat and with the Sr:Ca ratio of the sagittal otolith of the cavefish inhabiting that site. Mean values of Sr:Ca in otoliths suggest some cavefish inhabit sea or brackish waters while others remain in freshwater. Some individuals appear to move between waters of very different TDS at various stages but there is no consistency in the direction or apparent TDS range of the water bodies inhabited which indicates that the cavefish utilise the different water bodies opportunistically. Residual analyses indicate clear and routine changes in the TDS of the water occupied at various phases of growth, irrespective of the TDS at which the cavefish were sampled. Annular markings are present in some otoliths but they cannot be related to likely periodicities in the subterranean environment. The blind cavefish, Milyeringa veritas, inhabits an anchialine system, effectively a groundwater estuary, in which salinity varies between fresh and seawater at different locations and depths. Owing to the inaccessible habitat and the threatened status of the cavefish it is hard to obtain the biological information needed for their management. This paper explores the utility of otolith Sr:Ca ratio in elucidating cavefish biology. The mean Sr:Ca ratio of the water inhabited by the cavefish is correlated with both the TDS (total dissolved solids) of the habitat and with the Sr:Ca ratio of the sagittal otolith of the cavefish inhabiting that site. Mean values of Sr:Ca in otoliths suggest some cavefish inhabit sea or brackish waters while others remain in freshwater. Some individuals appear to move between waters of very different TDS at various stages but there is no consistency in the direction or apparent TDS range of the water bodies inhabited which indicates that the cavefish utilise the different water bodies opportunistically. Residual analyses indicate clear and routine changes in the TDS of the water occupied at various phases of growth, irrespective of the TDS at which the cavefish were sampled. Annular markings are present in some otoliths but they cannot be related to likely periodicities in the subterranean environment. © Springer 2006. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-33745590131&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/322270 http://ntur.lib.ntu.edu.tw/bitstream/246246/192764/-1/05.pdf |
DOI: | 10.1007/s10641-006-0012-6 | SDG/關鍵字: | estuary; fish biology; fishery management; otolith; periodicity; subterranean environment; Astyanax fasciatus mexicanus; Eleotridae; Forbesichthys agassizii; Gobio gobio; Milyeringa veritas |
顯示於: | 海洋研究所 |
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