Species Diversity of Gastropods Along a Disturbance Gradient in Rambungan Mangrove
Gastropods are diverse in mangrove habitat and the major group in the phylum Mollusca that inhabit both aquatic and terrestrial habitats. However, Rambungan mangrove are currently converted to aquaculture activities and affected by anthropogenic activities such as artisanal fishing, construction...
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Format: | Final Year Project Report |
Language: | English |
Published: |
Universiti Malaysia Sarawak, (UNIMAS)
2022
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Subjects: | |
Online Access: | http://ir.unimas.my/id/eprint/40179/1/Nur%20Syazwani%20Binti%20Abdul%20Manan%20%28fulltext%29.pdf http://ir.unimas.my/id/eprint/40179/ |
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Summary: | Gastropods are diverse in mangrove habitat and the major group in the phylum Mollusca
that inhabit both aquatic and terrestrial habitats. However, Rambungan mangrove are
currently converted to aquaculture activities and affected by anthropogenic activities such
as artisanal fishing, construction of Rambungan bridge, agriculture and coastal road in the
area, which poses negative impacts on the environment and gastropod fauna. Hence, the
objective of this research is to determine species richness and abundance of gastropods along
a disturbance gradient in mangrove habitats and to assess the environmental variables. The
gastropods were sampled using the line transect with quadrat approach, with distances of 10
m, 25 m, and 30 m along the river. The species richness and abundance of the gastropods
along the disturbance gradient was determined using diversity indices (Shannon-Weiner,
Margalef, Pielou and Jaccard index) and statistical test (Mann-Whitney, Independent t-test,
factorial ANOVA, and linear correlation) was done in JASP software. Species of gastropods
that was collected were Pirenella sp., Bulla ampulla sp., Assiminea sp., Indothais sp.,
Cerithium sp., Littorina sp., and Littoraria sp. The results show that there were low species
in this area and H’ value range of 0.436 and 0.558 which indicates low diversity value in
this Rambungan mangrove. Soil pH is the most affected by aquaculture ponds among three
environmental variables measured (salinity, pH and light intensity) and the effect of
aquaculture ponds is random and even across the sampling area. The findings of this study
on the abundance and distribution of gastropods in a disturbance gradient can serve as
reference for future study in the area |
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