Retrospective overviews are essential in development
planning and/or environmental health monitoring based on geological perspective
through paleoecology. The studies are using various indicators, one of which is
using recent foraminifera. Within last decades, the semi-enclosed bays of
Lamong Bay in Surabaya and Benoa Bay in Bali have had enormous physical
development. To ensure the continuity of existing infrastructure, it is
necessary to discover the threats of natural and/or anthropogenic hazards through
retrospective studies. Therefore the aim of this study is to reveal the
ecological development of semi- enclosed bays using benthic foraminifera as a
proxy over time periods. The research was conducted in March 2017, included
analysis of absolute age and sedimentation rate using the Pb-210 isotope and
recent foraminifera indexing from short core samples. The Ammonia-Elphidium
index (A-E index) as a proxy of hypoxia and the planktonic/benthic ratio (P/B)
as a proxy of open ocean flow were used in the study. The foraminiferal indeces
revealed that both sites have experienced different ecological changes in the
last few decades. Over the past 87 years, the Lamong Bay has undergone
ecological changes, from the aquatic environment that was strongly influenced by
the open sea and supports the benthic life, to shallow oligotrophic waters that
cannot support benthic life. In contrast, Benoa Bay was shallow waters for 50
years and supports benthic life without any significant threat as the other
coastal waters especially for the semi-enclosed bay. The research results
showed that massive development in coastal areas will affect the ecological
development/change of the area. Natural factors
Author(s) Details:
R. Rositasari
Research
Center for Oceanography, National Research and Innovation Agency Jl, Pasir
Putih I, Ancol Timur, Jakarta Utara, 1440, Indonesia.
Please see the book here: https://doi.org/10.9734/bpi/eieges/v6/6874E
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