caa a22 4500 606226869 CHVBK 20210128101155.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10641-014-0275-2 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0275-2 Migratory history of African longfinned eel Anguilla mossambica from Maningory River, Madagascar: discovery of a unique pattern in otolith Sr:Ca ratios [Elektronische Daten] [Yu-Jia Lin, Brian Jessop, Olaf Weyl, Yoshiyuki Iizuka, Shih-Huan Lin, Wann-Nian Tzeng] The migratory life histories were investigated for 30 African longfinned eels (Anguilla mossambica) of the yellow eel stage from the Maningory River, East Madagascar using otolith Sr:Ca ratios and parasite composition. The Sr:Ca ratio patterns of nine eels resembled those of A. mossambica in South Africa and of other anguillids and were classified as "typical” Sr:Ca ratio pattern eels. Typical pattern eels were further classified into freshwater residents (five eels) and habitat shifters (four eels) depending on whether they spent their first several years in saltwater. An unique Sr:Ca ratio pattern was found in 21 eels whereby the Sr:Ca ratios in the yellow eel stage increased drastically to extremely high values of 10 to 30 × 10−3 which have not been observed for any Elopomorpha species. These individuals were categorized as "elevated” Sr:Ca ratio pattern eels. The elevated pattern eels were characterized by significantly older ages, lower somatic growth rates, a much higher intensity and abundance of the gastrointestinal parasite Heliconema africanum and a lower abundance of the swim bladder parasite Anguillicoloides papernai. The extremely elevated Sr:Ca ratios of the yellow eel stage result most likely from inhabiting freshwater areas characterized by a high strontium concentration because the ratios far exceeded the known values for Elopomorpha species. Cyclical lows in the otolith Sr:Ca ratios of the elevated type eels corresponded to annuli, revealing either an overwintering movement pattern between habitats with different Sr:Ca ratios, or a seasonal change in the ambient environment. Springer Science+Business Media Dordrecht, 2014 Anguilla mossambica nationallicence Otolith Sr:Ca ratio nationallicence Parasite nationallicence Age and growth nationallicence Madagascar nationallicence Lin Yu-Jia Institute of Fisheries Sciences, National Taiwan University, 10617, Taipei, Taiwan aut Jessop Brian Department of Fisheries and Oceans, Bedford Institute of Oceanography, B2Y 4A2, Dartmouth, NS, Canada aut Weyl Olaf South African Institute for Aquatic Biodiversity (SAIAB), 6140, Grahamstown, South Africa aut Iizuka Yoshiyuki Institute of Earth Sciences, Academia Sinica, 11574, Taipei, Taiwan aut Lin Shih-Huan Institute of Fisheries Sciences, National Taiwan University, 10617, Taipei, Taiwan aut Tzeng Wann-Nian Institute of Fisheries Sciences, National Taiwan University, 10617, Taipei, Taiwan aut Environmental Biology of Fishes Springer Netherlands 98/1(2015-01-01), 457-468 0378-1909 98:1<457 2015 98 10641 https://doi.org/10.1007/s10641-014-0275-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0275-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lin Yu-Jia Institute of Fisheries Sciences, National Taiwan University, 10617, Taipei, Taiwan aut NATIONALLICENCE 700 1- Jessop Brian Department of Fisheries and Oceans, Bedford Institute of Oceanography, B2Y 4A2, Dartmouth, NS, Canada aut NATIONALLICENCE 700 1- Weyl Olaf South African Institute for Aquatic Biodiversity (SAIAB), 6140, Grahamstown, South Africa aut NATIONALLICENCE 700 1- Iizuka Yoshiyuki Institute of Earth Sciences, Academia Sinica, 11574, Taipei, Taiwan aut NATIONALLICENCE 700 1- Lin Shih-Huan Institute of Fisheries Sciences, National Taiwan University, 10617, Taipei, Taiwan aut NATIONALLICENCE 700 1- Tzeng Wann-Nian Institute of Fisheries Sciences, National Taiwan University, 10617, Taipei, Taiwan aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/1(2015-01-01), 457-468 0378-1909 98:1<457 2015 98 10641