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A relative growth index of hybridization in sunfishes (genus Lepomis , Centrarchidae)
Author(s) -
MISRA R. K.,
HOLDSWORTH C.
Publication year - 1972
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1972.tb00374.x
Subject(s) - lepomis , centrarchidae , allometry , genus , biology , lepomis macrochirus , hybrid , index (typography) , zoology , statistics , fish <actinopterygii> , ecology , mathematics , fishery , botany , micropterus , world wide web , computer science
Summary Sunfish specimens (genus Lepomis ) collected from Pinehurst Lake, Ontario, Canada, were identified as bluegill ( L. macrochirus ), pumpkinseed ( L. gibbosus ) and their hybrids. Hybridization was studied on the basis of the constants of cross‐sectional allometry as, to the best of our knowledge, no attempt has ever been made to study hybridization quantitatively from the relative growth aspect. Two sets of data‐‐‐one on the pair Y 1 /X (head length/standard length) and the other on the pair Y 2 /X (body depth/standard length)‐‐‐ were analysed, with the following objectives: (i)A statistical method of analysing hybrid index based on cross‐sectional allometry was first presented and then Y 1 /X‐data analysed by this method, and (ii)data Y 2 /X were analysed to show that in some particular situations analysis for hybridization by methods other than the hybrid index appraoch may be more appropriate. Results of the analyses were discussed.