JOHNGARTHIA LAGOSTOMA (H. MILNE EDWARDS, 1837) ON ASCENSION ISLAND: A VERY ISOLATED LAND CRAB POPULATION BY RICHARD G. HARTNOLL 1,3 ) , TERRI MACKINTOSH 2 ) and TARA J. PELEMBE 2 ) 1 ) Port Erin Marine Laboratory, University of Liverpool, Isle of Man IM9 5ED, British Isles 2 ) Conservation Centre, Georgetown, Ascension Island ASCN IZZ ABSTRACT A study was made of the land crab, Johngarthia lagostoma (H. Milne Edwards, 1837) on Ascension Island in the central South Atlantic: aspects of its distribution, population structure, and reproduction are described. On Ascension it is normally limited to altitudes > 200 m, the only parts of the island with substantial vegetation. The population comprised predominantly pale colour morphs, and few immature specimens were sampled. The significance of both factors is examined. The breeding migration to the shore was observed. Migrations occurred in February to April, varied in intensity between years, and were dominated by females. Migrants had to cross the bare arid lowlands, resulting in mortality. There are no recent records of the return of the juvenile crabs after the planktonic larval phase. RÉSUMÉ Une étude a été menée chez le crabe terrestre Johngarthia lagostoma (H. Milne Edwards, 1837)
Crustaceana – Brill
Published: Jan 1, 2006
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