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Publication Type J
Authors Johnson, P; Johnstone, R
Author Full Name Johnson, P; Johnstone, R
Title Productivity and nutrient dynamics of tropical sea-grass communities in Puttalam Lagoon, Sri Lanka
Source AMBIO
Language English
Document Type Article
Keywords Plus SEAGRASS COMMUNITIES; BACTERIAL PRODUCTIVITY; ORGANIC-CARBON; ZOSTERA-MARINA; AUSTRALIA; GULF; DECOMPOSITION; CARPENTARIA; EPIPHYTES; PLANTS
Abstract Tropical sea-grass ecosystems are among the most productive submerged systems to be found. This productivity supports, through dependent species of epiphytes and associated fauna, large numbers of fish which are important protein sources for the inhabitants of tropical coastal areas. In Puttalam Lagoon, Sri Lanka, one such ecosystem, with an important fish harvest to support the coastal population, was studied in two consecutive years during the monsoon season, October 1993 and November 1994. The meadows consisted predominantly of two species of sea grasses, Cymodocea rotundata and Enhalus acoroides. Oxygen production and consumption measurements using benthic chambers placed over the sea-grass communities revealed gross production to be between 574 and 1518 g C m(-2) yr(-1). All measurements showed community P:R ratios to be > 1.0, suggesting net export and/or burial of carbon in the system. The two years showed different patterns, but the variation in production rates was best explained by light penetration and salinity. Nutrient measurements showed phosphate uptake (17-82 mg P m(-2) day(-1)) while nitrogen fluxes displayed both release and uptake (-110 to 207 mg N m(-2) day(-1)). Analyses of nutrient dynamics as related to production rates indicated a dependency of the communities on sediment nutrient sources and internal nutrient recycling, despite elevated levels of water column nutrients (42-168 mu g N L(-1), 57-184 mu g P L(-1)). Production levels were low compared to other similar ecosystems and this is thought to be due to factors including dense epiphytic growth and high water turbidity resulting from the high nutrient levels, and seasonality.
Reprint Address Johnson, P (reprint author), UNIV STOCKHOLM,DEPT ZOOL,S-10691 STOCKHOLM,SWEDEN.
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Cited Reference Count 41
Times Cited 15
Total Times Cited Count (WoS, BCI, and CSCD) 16
Publisher ROYAL SWEDISH ACAD SCIENCES
Publisher City STOCKHOLM
Publisher Address PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN
ISSN 0044-7447
29-Character Source Abbreviation AMBIO
ISO Source Abbreviation Ambio
Publication Date DEC
Year Published 1995
Volume 24
Issue 7-8
Beginning Page 411
Ending Page 417
Page Count 7
Web of Science Category Engineering, Environmental; Environmental Sciences
Subject Category Engineering; Environmental Sciences & Ecology
Document Delivery Number TP457
Unique Article Identifier WOS:A1995TP45700005
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