Specialization, trophic breadth and diet overlap of thirteen small marine fish species from Shatt Al-Basrah Canal, Southern Iraq
Volume 5, Issue 2, Pages 118-130
AbstractSpecialization, trophic breadth and diet overlap of thirteen marine fish species from Shatt Al-Basrah Canal had been studied from July 2008 to June 2009. Data obtained revealed that seven species (Johnius belangerii, Platycephalus indicus, Silago arabica, Silago sihama, Thrysa hamiltoni, Thrysa mystex and Nematolosa nasus) were carnivorous, three species (Acanthopagrus latus, Leiognathus bindus and Boleophtalmus dussumieri) were herbivorous and one species (Scomberoides commersonnianus) was a piscivorous. Data obtained also revealed that six species were high specialized feeders (P. indicus, J. belangerii, B. dussumieri, T. hamiltoni, S. commersonnianus, A. latus) having breadth range 0-0.25, five species were low specialized feeders (T. mystex, N. Nasus, S. Sihama, Liza subviridis, Liza kulengeri) having breadth range 0.26-0.49 and two species were generalized feeders (S. arabica, L. bindus) having breadth range 0.50-1.00. The Morisita indexes of feeding overlap showed high overlap (0.97) between L. subviridis and B. dussumieri, medium overlap (0.65, 0.60) between J. belangeri, P. indicus and between J. belangerii, T. hamiltoni respectively, low overlap (0.10-0.49) for 25 occasion (32%), very low overlap (less than 0.10) for 38 occasion (48.7%) and thirteen occasions (15.4%) of having any feeding overlaps.
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