icolls - Sustainable Tourism CRC

More documents

Recommendations

Info

ECOLOGY, THREATS AND MANAGEMENT OPTIONS FOR SMALL ESTUARIES AND ICOLLS Technical Reports The technical report series present data and its analysis, meta-studies and conceptual studies, and are considered to be of value to industry, government and researchers. Unlike the Sustainable Tourism Cooperative Research Centre’s Monograph series, these reports have not been subjected to an external peer review process. As such, the scientific accuracy and merit of the research reported here is the responsibility of the authors, who should be contacted for clarification of any content. Author contact details are at the back of this report. Editors Prof Chris Cooper University of Queensland Editor-in-Chief Prof Terry De Lacy Sustainable Tourism CRC Chief Executive Prof Leo Jago Sustainable Tourism CRC Director of Research National Library of Australia Cataloguing-in-Publication Hadwen, Wade L. Ecology, threats and management options for small estuaries and ICOLLS. Bibliography. ISBN 1 920704 85 X. 1. Estuarine ecology - New South Wales. 2. Lagoon ecology - New South Wales. 3. Estuaries - Recreational use – New South Wales. 4. Lagoons - Recreational use - New South Wales. 5. Fish communities - New South Wales. I. Arthington, A.H. (Angela H.). II. Cooperative Research Centre for Sustainable Tourism. III. Title. 577.7809944 Copyright © CRC for Sustainable Tourism Pty Ltd 2006 All rights reserved. Apart from fair dealing for the purposes of study, research, criticism or review as permitted under the Copyright Act, no part of this book may be reproduced by any process without written permission from the publisher. Any enquiries should be directed to Director of Communications & Industry Extension [brad@crctourism.com.au] or Publishing Manager [trish@crctourism.com.au]. ii
ECOLOGY, THREATS AND MANAGEMENT OPTIONS FOR SMALL ESTUARIES AND ICOLLS CONTENTS ABSTRACT____________________________________________________________________________ VI ACKNOWLEDGEMENTS _______________________________________________________________ VI SUMMARY ___________________________________________________________________________ VII CHAPTER 1 THREATS TO THE ECOLOGICAL HEALTH OF ICOLLS: A REVIEW WITH EMPHASIS ON SMALL ICOLLS IN AUSTRALIA ___________________________________________ 1 ABSTRACT ____________________________________________________________________________ 1 INTRODUCTION ________________________________________________________________________ 1 PROCESSES THREATENING THE ECOLOGICAL HEALTH OF ICOLLS _________________________________ 4 Threatening Process 1: Eutrophication and Contamination_____________________________________ 4 Threatening Process 2: Fisheries _________________________________________________________ 6 Threatening Process 3: Artificial Berm Breaching and Modification of Flow Regimes _______________ 8 Threatening Process 4: Tourism and Recreational Use of ICOLLs______________________________ 11 Threatening Process 5: Coastal Development and Habitat Loss – Implications for Conservation ______ 12 KNOWLEDGE GAPS, RESEARCH PRIORITIES AND ECOLOGICALLY SUSTAINABLE MANAGEMENT PRACTICES FOR ICOLLS _________________________________________________________________________ 13 CHAPTER 2 MARINE SUBSIDIES SUPPORT ICOLL FOOD WEBS: THE DEVELOPMENT OF A MARINE PULSE CONCEPT _____________________________________________________________ 14 IMPLICATIONS OF CATCHMENT MODIFICATIONS ON ICOLL FOOD WEB STRUCTURE AND FUNCTION______ 14 CONCEPTUAL APPROACH TO CARBON FLOW IN ICOLL FOOD WEBS ______________________________ 14 MATERIALS AND METHODS ______________________________________________________________ 16 Site Selection_______________________________________________________________________ 16 Sampling Methods___________________________________________________________________ 17 Laboratory Sample Processing _________________________________________________________ 17 Analytical Methods __________________________________________________________________ 18 RESULTS ____________________________________________________________________________ 18 Isotopic Analyses ___________________________________________________________________ 19 DISCUSSION __________________________________________________________________________ 24 Biological Diversity and Conservation Value of ICOLLs_____________________________________ 24 Stable Isotope Signatures of Biota in ICOLLs _____________________________________________ 24 Opening Regimes and Carbon Flow in ICOLLs ____________________________________________ 24 Conclusions and Implications __________________________________________________________ 24 CHAPTER 3 SEWAGE EFFLUENT SIGNIFICANTLY INCREASES THE ∆ 15 N SIGNATURES OF RESIDENT BIOTA IN AN INTERMITTENTLY OPEN ESTUARY ____________________________ 26 INTRODUCTION _______________________________________________________________________ 26 MATERIALS AND METHODS ______________________________________________________________ 27 Sampling Sites______________________________________________________________________ 27 Sampling Methods___________________________________________________________________ 27 Laboratory Sample Processing _________________________________________________________ 28 Analytical Methods __________________________________________________________________ 28 RESULTS ____________________________________________________________________________ 28 Community Composition _____________________________________________________________ 28 Stable Isotopes______________________________________________________________________ 29 Intraspecific Variation in δ 15 n Signatures in Tallows Creek ___________________________________ 30 DISCUSSION __________________________________________________________________________ 33 Sewage Effluent and δ 15 n Signatures of Biota in Tallows Creek _______________________________ 33 Food Web Structure and Function in Tallows and Belongil Creeks _____________________________ 33 Patterns of Fish Movement Inferred from Nitrogen Isotope Signatures __________________________ 34 iii
Page 1: ECOLOGY, THREATS AND MANAGEMENT OPT
Page 5 and 6: ECOLOGY, THREATS AND MANAGEMENT OPT
Page 9 and 10: Chapter 1 ECOLOGY, THREATS AND MANA
Page 31 and 32: Hypseleotris spp. Pseudomugil signi
Page 39 and 40: δ15 δ N (‰) 15N (‰) δ15 δ N
Page 53 and 54:
ECOLOGY, THREATS AND MANAGEMENT OPT
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Research Programs The Sustainable T
show all

icolls - Sustainable Tourism CRC

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?