Keanekaragaman Jenis Biota Perairan Hutan Mangrove Pasca Tumpahan Minyak Tanker Di Pantai Cilacap
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2001
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/21529/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=4394 |
Daftar Isi:
- One of he ecological limei ions of mangrove Rifest which can not he replaced by other kind of ecosystems is its function as a place for the aquatic organisms living there to nurse their offsprings, to lay the eggs, and to seek the fbods. This function is so essential that this ecosystem should be maintained. Rehabilitation of mangrove has been done, i.e. by replanting the disappeared species on the area. This effort, however, is often unsuccessful. One of the causes is the water pollution. Water pollution might he caused by oil spilling that created an upper layer on sea. The damage resulted by oil pollution is determined by the thickness of oil layer. The study aimed to evaluate the effect of oil spilling recently happened from tankership at Cilacap coastal area on the species diversity of aquatic organisms. The research was established by using sample location of I ha on which oil spilling happened. The sample area was then divided into 3 zones, namely are proximal, middle, and distal zones. At each zone the observations were done on the numbers and species of the vegetation, plankton, nekton and on the environmental factors which consisted of temperature, pl I, salinity and disolved oxygen. The obtained data were. analyzed by using Simpson Diversity Index formula, and to check the significance of the observation data obtained before and after the oil spilling the CR D Varians Test at 5% level of significancy was applied. The result showed that there was an average decline from 281.8 spec/litre to 91.5 species/litre on the phytoplankton density due to oil spilling, ID of zooplankton, necton and the aquatic physical-chemical factors has decreased. The diversity index olzooplankton changes from 0.68 to 0.50, and that of nekton changed from 0.79 to 0.45. These declines might be caused by the decreasing of aquatic quality , i.e. the average temperature is from 27.7°C to 28.5°C, from 7.5 to 6.7, from 3.16 to 2.76, from 1.32 to 0.86% Ibr the changes °Idle p1 I, salinity, organic material respectively. it was concluded that the spilled oil of the tanker at Cilacap Coastal Area has decreased its aquatic organisms species diversity. The measures to mitigate the decrease of the species diversity on the area should be implemented in order to prevent the degradation of the mangrove ecosystem which is more severe. Keywords : mangrove, spilled of I tanker, species diversity.