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Authors Ball, D; Soto-Berelov, M; Young, P
Author Full Name Ball, David; Soto-Berelov, Mariela; Young, Peter
Title Historical seagrass mapping in Port Phillip Bay, Australia
Source JOURNAL OF COASTAL CONSERVATION
Language English
Document Type Article
Author Keywords Aerial photography; Coastal habitats; GIS; Marine habitat mapping; Remote mapping; Seagrass; Zostera
Keywords Plus EELGRASS ZOSTERA-MARINA; LONG-TERM CHANGES; WASTING DISEASE; ECOSYSTEM SERVICES; WESTERN-AUSTRALIA; IMPACTS; MEADOWS; GROWTH; COVER; GULF
Abstract Seagrass beds are highly productive ecosystems and a decline in this habitat has become a global concern in recent decades. This study mapped seagrass at three sites in Port Phillip Bay between 1939 and 2011 and reviewed possible influences on seagrass cover changes. Historical aerial photographs from multiple sources were digitally scanned and orthorectified. Automated image processing techniques incorporating an unsupervised classification combined with minor editing in a GIS were applied to map seagrass cover and analyse variations in the size and distribution of seagrass beds. Large declines in seagrass cover were observed at all three sites after 1998. In contrast to other world-wide observations, these recent declines were preceded by a period of sustained seagrass expansion between the 1960s and 1990s and lower levels of seagrass cover were observed in the 1930s/40s. The recent and earlier low levels of seagrass cover coincided with extended droughts characterised by large reductions in nutrient inputs to the Bay. However, recent declines were not consistent across the Bay with three other sites remaining relatively stable during this period. The sites with large declines are all subject to longshore drift and changes in nearshore sediment transport driven by variations in weather patterns coinciding with extended periods of drought may be important influences on seagrass cover at these locations.
Author Address [Soto-Berelov, Mariela] RMIT Univ, Sch Math & Geospatial Sci, Melbourne, Vic 3001, Australia; [Young, Peter] URS Australia Pty Ltd, Perth, WA 6000, Australia
Reprint Address Ball, D (corresponding author), POB 457, Frankston, Vic 3199, Australia.
E-mail Address davidnball@hotmail.com; mariela.soto-berelov@rmit.edu.au
ORCID Number Ball, David/0000-0003-3536-9863; Soto-Berelov, Mariela/0000-0003-1285-1622
Funding Agency and Grant Number Port of Melbourne Corporation
Funding Text The historical seagrass mapping was funded by the Port of Melbourne Corporation and undertaken by the authors while working with the now defunct Victorian Fisheries Research Branch Habitat Ecology Section. We thank Sean Blake, Simon Heislers and Guy Werner formerly of the DPI Fisheries Research Branch who assisted with the video ground-truthing. We also thank Rick Frisina and Michael Conroy at the Department of Sustainability and Environment's Coordinated Imagery Program who supplied the 2004 Metropolitan Melbourne aerial photographs and assisted with appointing a consultant for the digital scanning and orthorectification tasks. Thanks are also due to the anonymous reviewer who provided constructive comments and suggestions.
Times Cited 17
Total Times Cited Count (WoS, BCI, and CSCD) 17
Publisher SPRINGER
Publisher City NEW YORK
Publisher Address 233 SPRING ST, NEW YORK, NY 10013 USA
ISSN 1400-0350
29-Character Source Abbreviation J COAST CONSERV
ISO Source Abbreviation J. Coast. Conserv.
Publication Date JUN
Year Published 2014
Volume 18
Issue 3
Beginning Page 257
Ending Page 272
Digital Object Identifier (DOI) 10.1007/s11852-014-0314-3
Page Count 16
Web of Science Category Biodiversity Conservation; Environmental Sciences; Marine & Freshwater Biology; Water Resources
Subject Category Biodiversity & Conservation; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources
Document Delivery Number AI3DM
Unique Article Identifier WOS:000336739500010
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