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Early life history traits and geographical distribution of Parachaenichthys charcoti

Published online by Cambridge University Press:  22 May 2017

Mario La Mesa ,
Emilio Riginella  and
Christopher D. Jones
Mario La Mesa*
Affiliation:
ISMAR-CNR, Istituto di Scienze Marine, UOS Ancona, Largo Fiera della Pesca, 60125 Ancona, Italy
Emilio Riginella
Affiliation:
ISMAR-CNR, Istituto di Scienze Marine, UOS Ancona, Largo Fiera della Pesca, 60125 Ancona, Italy Dipartimento di Biologia, Università di Padova, Via U. Bassi 58/B, 35131 Padova, Italy
Christopher D. Jones
Affiliation:
Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 8901 La Jolla Shores Drive, La Jolla, CA 92037, USA
*
m.lamesa@ismar.cnr.it
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Abstract

The geographical distribution of the two species of the genus Parachaenichthys is allopatric and restricted to the inner shelves of South Georgia–South Sandwich Islands (P. georgianus) and South Orkney Islands–South Shetland Islands (P. charcoti). To evaluate the consistency between the geographical patterns of adult distribution and early life history traits of P. charcoti, sagittal otoliths were used to estimate growth rate and pelagic duration in larvae and juveniles of this species collected in the Bransfield Strait in winter and summer, respectively. Individual age was determined through microincrement counts, assuming they were daily increments. The Gompertz model was fitted to age–length estimates, providing a mean growth rate of 0.22 mm day-1 estimated for 28–204-day-old individuals. Larval hatching was spread over a relatively wide period, lasting from July throughout September. The pelagic larval duration of P. charcoti was about six months based on ageing data of larvae and juveniles, as reported for P. georgianus from South Georgia. The strong dependence of larvae on the inshore habitat may hamper their dispersal at large spatial scale limiting the connectivity among distant populations, providing clues to interpret the present geographical distribution of the two species.

Keywords

age and growthAntarctic Peninsulabathydraconidjuvenileslarvaezoogeography
Type
Biological Sciences
Information
Antarctic Science , Volume 29 , Issue 5 , October 2017 , pp. 410 - 416
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Copyright
© Antarctic Science Ltd 2017 

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