Successfulness The successfulness of planulae
metamorphosis to become juveniles commenced succession toward the formation of
a new coral community following a stress. The better the remnant, the more
similar the recovered community will be. Coral remnants may provide attachment
preference for benthic organisms including its planulae and indeed served as a
nursery ground, even a habitat for various species. This study aimed to
evaluate the recovery of the coastal coral community in Panjang Island, Jepara-Indonesia
based upon several variables of water quality, recruitment through the
succession stages, survivorship and the overall growth of the coral. During the
first week of June 2013 until the end of October 2013 after a west monsoon, six
slate collector devices were immersed between the slope and plain of the
continental shelf at the north, south and eastward of Panjang Island at ca.
1.5" " m depths. Data collected comprised of bacteria, macro- and
micro-periphyton including planulae, along with salinity, temperature, depth,
turbidity, dissolved oxygen, orthophosphate and nitrate of the water, as well
as inorganic and organic content of the sediment. Recorded genera in the
collectors were Porites, Acropora, Pocillopora and Platygira. Results suggested
that coastal coral in Panjang Island is inclined to extinct, in particular, due
to severe sedimentation load. Planulae recruit considered low with
metamorphosis ability to become juveniles only at 5 colonies. M2. Month-1 at
the southward and 1.3 colonies. m^(-2). Month-1 at the northward of the island.
Dissolved organic materials in the sediment prompt the increase of nitrate to
cause macroalgal bloom, which in turn may cover the whole coral surface and
induced the spread of pathogenic bacteria, i.e., Pseudomonas spp. and
Phormidium corallyticum amongst the recruited planulae. It can be concluded
that factors causing difficulties in recovering coral in Pulau Panjang, in
particular planulae recruit are: 1) physical damage due to coastal development
and tourism-related activities, 2) pollution and runoff from urban areas
nearby, 3) agricultural activities which that introduce pollutants such as
chemicals and sedimentation, and 4) coral diseases that may decreased
resilience to other stressors. Addressing these factors through conservation
efforts, sustainable management practices and law enforcement may help protect
and restore damaged coastal corals in Panjang Island.
Author (s) Details
Norma Afiati
Faculty of Fisheries and Marine Science, Diponegoro University, Tembalang,
Semarang, Indonesia.
Pujiono W. Purnomo
Faculty of Fisheries and Marine Science, Diponegoro University, Tembalang,
Semarang, Indonesia
Please see the link :- https://doi.org/10.9734/bpi/ibs/v7/7875E
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