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Breeding experiments to distinguish two sibling species of Halicarcinus (Crustacea, Brachyura)
Author(s) -
Lucas J. S.
Publication year - 1970
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1970.tb02905.x
Subject(s) - biology , hybrid , introgression , biological dispersal , larva , hybrid zone , zoology , sibling , ecology , gene flow , botany , genetic variation , genetics , gene , demography , developmental psychology , sociology , psychology , population
Hybridization experiments and various salinities were used in investigating the status of two Halicarcinus lacustris‐like , forms, one of which has no free larval stages (direct‐development) and the other of which has normal larval stages (indirect‐development). Hybrids were produced, at least from indirect‐development female x direct‐development male crosses, but introgression of genetic material was limited to F 2 hybrids from the female parental form. There were no intergrades between the two modes of development in F 1 and F 2 hybrids or as a response to salinity. These forms are established as sibling species. The name lacustris applies to the direct‐development form and the other is a new species, H. paralacustris , which is described. Hybridization in the field is unlikely due to geographical and reproductive isolating mechanisms. Contrary to a previous view, it seems that H. lacustris had a recent origin in Australia and transport by water birds is suggested as the mode of dispersal through south‐east Australasia.