icolls - Sustainable Tourism CRC

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ECOLOGY, THREATS AND MANAGEMENT OPTIONS FOR SMALL ESTUARIES AND ICOLLS CHAPTER 4 COMPARISON OF DIETS OF FOUR COMMERCIALLY AND RECREATIONALLY IMPORTANT FISH SPECIES IN TWO ICOLLS IN NORTHERN NEW SOUTH WALES _________ 36 iv ABSTRACT ___________________________________________________________________________ 36 MATERIALS AND METHODS ______________________________________________________________ 37 Study Species ______________________________________________________________________ 37 Study Area_________________________________________________________________________ 37 Sampling Methods___________________________________________________________________ 38 Sample Processing___________________________________________________________________ 38 Dietary Analysis ____________________________________________________________________ 38 RESULTS ____________________________________________________________________________ 39 Catch Data _________________________________________________________________________ 39 Dietary Composition _________________________________________________________________ 40 Dietary Breadth _____________________________________________________________________ 43 DISCUSSION __________________________________________________________________________ 44 CONCLUSION _________________________________________________________________________ 45 APPENDIX A: THE INTERMITTENTLY CLOSED AND OPEN LAKES (ICOLLS) SPECIAL SESSION AT THE ‘ESTUARIES AND CHANGE’ CONFERENCE_____________________________ 46 APPENDIX B: TAXA (SCIENTIFIC AND COMMON NAMES) COLLECTED FROM STUDY ICOLLS _______________________________________________________________________________ 49 APPENDIX C: ALL ABSTRACTS SUBMITTED TO THE ICOLLS SPECIAL SESSION AT THE ‘ESTUARIES AND CHANGE’ CONFERENCE _____________________________________________ 51 REFERENCES _________________________________________________________________________ 65 AUTHORS_____________________________________________________________________________ 76 LIST OF TABLES Table 1: Processes threatening the ecological health of ICOLLs _____________________________________ 3 Table 2: Taxa collected from study ICOLLs____________________________________________________ 18 Table 3: Mean and S.E. δ13C values for all food web components sampled from all study ICOLLs.________ 19 Table 4: Mean and S.E. δ15N values for all food web components sampled from all study ICOLLs ________ 21 Table 5: Macroinvertebrate and fish taxa collected from Tallows Creek and Belongil Creek in May 2003 ___ 29 Table 6: Percent contribution of epilithon, filamentous green algae, mangroves and riparian vegetation to consumers in Belongil and Tallows Creeks, May 2003 ____________________________________ 32 Table 7: Physical properties recorded at the time of sampling for each location ________________________ 38 Table 8: Catch data and individual characteristics for A. australis, P. fuscus, S. ciliata and M. cephalus in Belongil and Tallows Creek _________________________________________________________ 39 Table 9: Dietary categories in the stomach contents of A. australis and P. fuscus in Belongil and Tallows Creeks __________________________________________________________________________ 40 Table 10: Dietary categories in the stomach contents of S. ciliata and M. cephalus in Belongil and Tallows Creeks __________________________________________________________________________ 41 LIST OF FIGURES Figure 1: Conceptual model of carbon sources and pathways in an ICOLL____________________________ 15 Figure 2: Maps of study ICOLLs in northern New South Wales ____________________________________ 16 Figure 3: Map of study ICOLLs in Byron Bay, New South Wales, Australia __________________________ 27 Figure 4: Mean (± SE) δ 15 N signatures of all food web components collected from both Tallows and Belongil Creeks in May 2003________________________________________________________________ 30
ECOLOGY, THREATS AND MANAGEMENT OPTIONS FOR SMALL ESTUARIES AND ICOLLS Figure 5: δ 15 N and δ 13 C signatures of all food web components collected from a) Belongil Creek and b) Tallows Creek in May 2003 ________________________________________________________________ 31 Figure 6: Comparison of gut contents and stable isotope analyses of percent contribution of prey types to the diet of A. australis individuals in Belongil Creek ____________________________________________ 42 Figure 7: Mixing model analyses of sources of carbon contributing to M. cephalus diets from individuals caught in Tallows (n=12) and Belongil (n=13) Creeks___________________________________________ 42 Figure 8: Comparison of gut contents and stable isotope analyses of percent contribution of prey types to the diet of S. ciliata individuals in Belongil Creek_______________________________________________ 43 Figure 9: Dietary breadth of P. fuscus, A. australis, S. ciliata and M. cephalus as determined by Shannon-Wiener (H`) and Evenness (J) indices ________________________________________________________ 43 v
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Research Programs The Sustainable T
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