Analisis pencemaran antropogenik dan struktur komunitas diatom planktonik sebagai indikator pencemaran perairan di Selat Air Hitam

Abstract

The present study aimed at identify population characters pollution source which affect water fertily nitrate, phospate, abundance as well as community structure of planctonic diatomae were measured. Nine sampling station of three location were established a long the Selat Air Hitam water. Appearently domestic activity, marine traffic, sago processing plant and community economic had affected on water fertility due to effluent water that entered the water. Nitrate analysis showed a range of 187,5 to 262,5 µg/L mean while phospate consentration appear 28,8- 241,2 µg/L, silicate consentration appear 30,4-32,9 µg/L. Plactonic diatomae abundance came up 2400 to 3800 cell/L of nine genera. Biodiversity index of range (1≤H’≤3), while smiliarity index (0,5≤E≤1) and dominancy index (0,5≤E≤1). Those index indicate nthe Selat Air Hitam waters in a medium pressure, however ecosystem condition is stable. Nitrate, phospate and silicate positively and significantly correlated with diatomae abundance ( p0,05). TSS level appeared 18,33 – 45,00 mg/l and BOD berkisar 3,73 – 5,07 mg/l. Regression analysis showed that nitrate and phospate had a mayor affect to diatomae abundance.

Analisis Struktur Komunitas Fitoplankton pada Perairan Tambak Udang Vannamei (Litopenaeus vannamei) di Kecamatan Manyar, Kabupaten Gresik.

“…Pada stasiun 2 tidak ada aktivitas pembuangan limbah yang menyebabkan penumpukan bahan organik sehingga memperkecil populasi fitoplankton dalam perairan tambak stasiun 2. Hal tersebut sesuai dengan pernyataan Tampubolon [16] perbedaan kelimpahan pada setiap stasiun dapat dipengaruhi oleh kegiatan disekitar perairan dan juga kondisi di setiap stasiunnya, dimana setiap stasiun mempunyai pengaruh antropogenik yang berbeda dan adanya ketersediaan unsur hara yang juga mempengaruhi pertumbuhan fitoplankton khususnya diatom.…”