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Authors Nayar, S
Author Full Name Nayar, S.
Title Uptake of inorganic phosphorus by temperate seagrass beds of Posidonia and Amphibolis in Southern Australia
Source ENVIRONMENTAL MONITORING AND ASSESSMENT
Language English
Document Type Article
Author Keywords Seagrass; Posidonia; Amphibolis; Epiphytes; Phosphorus uptake; South Australia
Abstract Seagrasses occupy a narrow band of sandy seabed close to the coast and are therefore vulnerable to anthropogenic influences, particularly meadows near large population centres. Over 5000 ha of seagrasses have been lost from Adelaide coastal waters (South Australia) over the past 70 years and much of this loss has been attributed to nutrient inputs from wastewater, industrial and stormwater discharges. This led to the Adelaide Coastal Waters Study to understand processes along the Adelaide metropolitan coast that led to seagrass loss. This study, a subset of the larger ACWS study, used in situ nutrient spike approach to obtain ecologically relevant estimates of seasonal variability in phosphorus uptake in two species of temperate seagrass common to this coast (Amphibolis antarctica and Posidonia angustifolia). Total uptake of phosphorus by biological components in the seagrass beds, viz., seagrass, epiphytes and phytoplankton, was negligible, never exceeding 0.5 % of the total resource. Phosphorus uptake rate varied seasonally with higher rates in winter (1.49 mu mol P. g(-1) DW. h(-1)) and lower rates in spring (0.70 mu mol P. g(-1) DW. h(-1)) for Amphibolis and highest in winter (2.09 mu mol P. g(-1) DW. h(-1)) and least in spring (0.14 mu mol P. g(-1) DW. h(-1)) for Posidonia. Low biological uptake rates of inorganic phosphorus could be attributed to carbonate sediments and particulates in the water column binding inorganic phosphorus, limiting its availability for biological uptake. From an environmental perspective, seagrass beds in the Adelaide coastal waters account for the assimilation of only 5.4 % (19.53 t yr(-1)) of the total anthropogenic inputs of phosphorus.
Author Address [Nayar, S.] South Australian Res & Dev Inst Aquat Sci, Algal Prod Grp, West Beach, SA 5024, Australia; [Nayar, S.] SARDI Aquat Sci, Henley Beach, SA 5022, Australia
Reprint Address Nayar, S (corresponding author), SARDI Aquat Sci, POB 120, Henley Beach, SA 5022, Australia.
E-mail Address sasi.nayar@sa.gov.au
ResearcherID Number nayar, Sasi/Q-8101-2019
ORCID Number nayar, Sasi/0000-0002-3730-6682
Funding Agency and Grant Number Adelaide Coastal Waters Study
Funding Text The author wish to thank G.J. Collings, D.J. Miller, B.M. Smith, K. Rowling and M. Theil for assistance with field-work and G. Mount, P. Wilson, E. O'Loughlin and J. Lill with assistance in the laboratory. Thanks are also due to G.J. Collings, J. Tanner and M. Loo who provided critical but constructive criticism on the draft version of this manuscript. This research was funded as part of the Adelaide Coastal Waters Study.
Times Cited 2
Total Times Cited Count (WoS, BCI, and CSCD) 2
Publisher SPRINGER
Publisher City DORDRECHT
Publisher Address VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN 0167-6369
29-Character Source Abbreviation ENVIRON MONIT ASSESS
ISO Source Abbreviation Environ. Monit. Assess.
Publication Date AUG
Year Published 2015
Volume 187
Issue 8
Article Number 512
Digital Object Identifier (DOI) 10.1007/s10661-015-4729-6
Page Count 10
Web of Science Category Environmental Sciences
Subject Category Environmental Sciences & Ecology
Document Delivery Number CN9PW
Unique Article Identifier WOS:000358782300031
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