TASMANIAN SEAGRASS COMMUNITIES

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1 TASMANIAN SEAGRASS COMMUNITIES by Christopher Grant Rees, B.Ed (}Ions.) Submitted in partial fulfilment of the requirement for the degree of Master of Environmental Studies (By Coursework) Centre for Environmental Studies University of Tasmania June 1993

2 STATEMENT This thesis contains no material which has been accepted for the a ward of any other degree or diploma in any university, and to the best of the author's knowledge and belief the thesis contains no copy or paraphrase of material previously published or written by other persons except when due reference is made in the text of the thesis.

3 Page i ABSTRACI Seagrasses are marine angiosperms that grow in sheltered coastal and estuarine water bodies. They play a significant role in coastal marine ecology, and are important breeding and feeding grounds for a number of fish species. However, seagrasses are vulnerable to the impacts of some human activities through their sensitivity to reduced light energy. This may be lowered by increased turbidity and sedimentation, or the excessive growth of algal epiphytes in response to raised nutrient levels. Five seagrass species occur in Tasmania, Amphibolis antarctica (Labill.) Sonder et Aschers., Halophila australis Doty & Stone, Heterozostera tasmanica (Marten ex Aschers.), Posidonia australis Hook. f. and Zostera muelleri Irmisch & Aschers., their presence or absence defining five zones around the Tasmanian coast. Most coastal areas were sampled., and seagrass beds located. When sampling these beds, the species, depth, density, substratum and presence of algal epiphytes were recorded. Using available aerial photography from three time periods (circa circa 1970 and the present)., seagrass beds in selected areas were digitally mapped into a GIS database using ARC/INFO. The sample site attributes were added to the database, and patterns of distribution and change analysed and mapped. The five seagrass species have distinct zonation patterns and distributions in relation to region. coastal formation, substratum and depth. An area of approximately 220 km2 was mapped, leading to speculation that from 400 to 500 km2 of sea grass rna y occur in Tasmania. However, the results of the analysis and mapping also indicate significant decline. Total loss has occurred in some areas. Decline is most pronounced in those parts of the State close to centres of human population and activity. There is a strong relationship between the seagrass decline in coastal areas and the presence and abundant of algal epiphytes. Ambient nutrient levels in some coastal water bodies are likely to be a major cause of seagrass decline. In this context, this thesis proposes some mechanisms for the management and protection of Tasmania's seagrass communities. and nominates representative coastal areas for possible reserve status.

4 . Page ii ACKNOWLEDGEMENTS This project has been made possible by the generous provision of a scholarship and considerable material support from the Tasmanian Department of Primary Industry and Fisheries, Division of Sea Fisheries, and a research grant provided through the National Estate Grants Program. Essential also to the success of the project have been the contributions made by a number of organisations and individuals. In particular I wish to thank: the Centre for Spatial Information Studies (CenSIS), University of Tasmania, who provided workspace, training and support in the use of ARC/INFO; the Tasmanian Department of Environment and Land Management, Land Information Bureau for access to their aerial photograph library; the Central Science Laboratory, University of Tasmania for training and assistance when exploring the possibility of using Landsat imagery; the Tasmanian Department of Primary Industry and Fisheries, Division of Sea Fisheries for water transport to many parts of the Tasmanian coast; the Tasmanian Department of Environment and Land Management, Parks and Wildlife Service for their interest in the project and access to the Port Davey and Bathurst Harbour area. People in all these organisations have shown nothing but kindness, patience, support and generosity. I also wish to thank my supervisors Professor Jamie Kirkpatrick, Department of Geography and Environmental Studies, University of Tasmania for the quality of his guidance, and Dr. Howel Williams, Tasmanian Department of Primary Industry and Fisheries, Division of Sea Fisheries whose interest in seagrasses initiated this study, and who organised th financial and other support provided by the Division. I also want to acknowledge the valuable supervision in the early stages of the project of Dr. Pierre Horwitz1 formerly of the Centre for Environmental Studies, University of Tasmania. My thanks are also extended to the oyster farmers and fishers who took me sampling, to all those who contacted me with information about seagrasses, to those researchers who gave me so much useful advice and information, and to the staff and students of the Department of Geography and Environmental Studies, University of Tasmania for their help. Finally, thanks go to all those at the Centre for Environmental Studies, University of Tasmania who have made it such a special place to study, and to my partner Karen for all her understanding and support....

5 Page iii CONTENTS Chapterl Introduction Context of study 1.2 Seagrass ecology The role of seagrasses in coastal marine ecosystems The structure of seagrass communities The role of seagrass communities in the ecology of fish 1.3 Seagrasses and coastal management Seagrasses as environmental indicators Seagrass habitat protection 1.4 Seagrass decline Case studies Causes of seagrass decline Natural variance in seagrass distribution 1.5 Tasmanian seagrasses The Tasmanian seagrass flora in a regional context Tasmanian seagrass species 1.6 This project Aims Hypotheses Scope and limitations Report structure Chapter2 The Tasmanian coast and seagrass habitat classification Tasmanian coastal climate Water Temperature Wind regimes Air temperatures Tides Contents

6 Page iv 2.2 Tasmanian coastal water quality Turbidity and pollution Salinity 2.3 Seagrass habitat description and classification Sea grass habitat Habitat classification Studies classifying Tasmanian coastal habitats A coastline classification adopted in this study Description of habitat types Chapter3 Seagrass mapping Seagrass mapping an overview Field survey techniques Remote sensing Geographic Information Systems (GIS) 3.2 Mapping seagrass community boundaries 3.3 Mapping definition & accuracy Chapter4 Methods Field data collection Sample areas and zoning Access Constraints 4.2 Field data recording Seagrass presence or absence Species identification, collection and recording Depth Density Algal epiphyte growth Above sediment shoot length Substratum type Contents

7 ...:... Page v 4.3 Remotely sensed data Aerial photograph selection Digitising & data entry Analysis Map production 4.4 Associated data Oral reports 4.5 Beach searching 4.6 Data accuracy and reliability Field sampling errors Mapping errors Chapter 5 Results- Present seagrass distribution in Tasmania Species distribution Amphibolis antarctica Halophila australis Heterozostera tasmanica Posidonia australis Zostera muelleri, & Z. muelleri sensu stricto 5.2 Sample area profiles Zone A- North coast and Bass S trait islands Zones B, C and part of D - East coast Zone D - South east Zone E - South coast, south west & west coast 5.3 Discussion of present seagrass extent and distribution The extent of seagrass in Tasmania The distribution of seagrass species in Tasmania Chapter6 Results - Impacts and changes Mapping the current and past seagrass coverage Changes in seagrass extent Contents

8 Page vi Overiew of seagrass changes in Tasmania Algal epiphytes Occurrence of algal epiphytes on seagrass beds Occurrence of algal epiphytes on different seagrass species Correlation of algal epiphyte occurrence and seagrass decline Other impacts on seagrass beds Damage by boating activities and infrastructure Cygnus atratus- the Black Swan 172 Chapter 7 Discussion 7.1 Management and protection Monitoring Protected areas 7.2 In conclusion References 179 Appendix I. Aerial photography details II. Modified double sided anchor dredge Contents

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