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Comparison of the reproductive ecology of two sympatric blacktip sharks ( Carcharhinus limbatus and Carcharhinus tilstoni ) off north‐eastern Australia with species identification inferred from vertebral counts
Author(s) -
Harry A. V.,
Morgan J. A. T.,
Ovenden J. R.,
Tobin A. J.,
Welch D. J.,
Simpfendorfer C. A.
Publication year - 2012
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2012.03400.x
Subject(s) - carcharhinus , biology , sympatric speciation , sympatry , ecology , philopatry , zoology , fishery , population , biological dispersal , demography , sociology
Precaudal vertebral counts were used to distinguish between 237 morphologically similar Carcharhinus limbatus and Carcharhinus tilstoni and were congruent with differences in reproductive ecology between the species. In addition to differing lengths at maturity and adult body size, the two species had asynchronous parturition, were born at different sizes and the relative frequencies of neonates differed in two coastal nursery areas. Despite evidence that hybridization can occur, these differences suggest the species are largely reproductively isolated.