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Sapto P Putro
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SPATIAL AND TEMPORAL PATTERNS OF THE MACROBENTHIC ASSEMBLAGES IN RELATION TO ENVIRONMENTAL VARIABLES Sapto P Putro
JOURNAL OF COASTAL DEVELOPMENT Vol 10, No 3 (2007): Volume 10, Number 3, Year 2007
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

This study focuses on the effect of fallowing of southern blue-fin tuna farms in southern Spencer Gulf, South Australia, on macrobenthic assemblage comparing spatial and temporal patterns of distribution and abundance at eight control sites and eight fallowed pontoon sites, during the period October 2002 to October 2003. Two stations at each site were sampled five times throughout the year with four replicates. Polychaetes were the most abundant organisms both at control sites (76.4%) and fallowed pontoon sites (80.5%). Five dominant taxa (Capitellidae, Cirratullidae, Lumbrineridae, Nephtyidae, and Spionidae), relatively tolerant to organic enrichment, were generally recorded in higher numbers at the fallowed sites than at control sites.Assessed using univariate and multivariate analyses, a significant difference in abundance between the control and fallowed pontoon sites was found, which also showed a significant effect of time. A slight decreased in diversity, number of taxa, and evenness at fallowed pontoon sites compared to those at control sites was observed. Seasonal fluctuations caused by natural variability, especially hydrodynamic conditions and sediment characteristics, are likely to be responsible for the observed changes of the assemblages.
RESPONSE OF TROPHIC GROUPS OF MACROBENTHIC FAUNA TO ENVIRONMENTAL DISTURBANCE CAUSED BY FISH FARMING Sapto P Putro
JOURNAL OF COASTAL DEVELOPMENT Vol 12, No 3 (2009): Volume 12, Number 3, Year 2009
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

Sediment dynamics and the hydrodynamics of the environment cause the complexity and variability inanimal-sediment relationship, both in spatial and temporal. This study is focused on the response ofmacrobenthic fauna to environmental disturbance caused by fish farming using their trophic structure.Their changes in trophic structure can be used as an indicator of disturbance. Eight control sites and eightfarm pontoon sites were samped in a full year period. Two stations at each site were sampled five timesthroughout the year with four replicates. Macrobenthic abundance was categorised based on six majortrophic groups: carnivores (CAR), herbivores (HER), omnivores (OMN), suspension feeders (SF), surfacedeposit feeders (SDF), and subsurface deposit feeders (SSDF). The Infaunal Trophic Index (ITI) andShanon-Wiener diversity index (H’) were used to assess the degree of environmental disturbance caused byfish farming based on trophic structure. The relationship between ITI and H’ was assessed usingSpearman’s rank order correlation (rho). The result showed that the abundance of deposit feeders wassignificantly higher at the farm sites than at the control sites, suggesting that food availability is morevaried and abundant at farm sites than those at control sites. The results of the ITI indicate that the entiresampling sites have been moderately disturbed over the sampling period, with the exception for site BC8.Variability of Shanon-Wiener diversity index (H’) spatially and temporally seems co-vary with ITI, owing tothe influence of taxa richness and evenness.
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