STRUKTUR KOMUNITAS LARVA IKAN PADA EKOSISTEM MANGROVE DENGAN UMUR VEGETASI YANG BERBEDA DI DESA TIMBULSLOKO, DEMAK

Novrizal Soni Riswandha, Anhar Solichin, Norma Afiati

Abstract


Mangrove di kawasan Desa Timbulsloko, Demak yang semula rusak dengan perlahan mulai direhabilitasi melalui kegiatan Mangrove Replant (MR). Hasil dari kegiatan tersebut membentuk suatu zonasi mangrove berdasarkan umur vegetasi mangrove yang diperkirakan mempunyai pengaruh terhadap struktur komunitas larva ikan yang berada di dalamnya. Penelitian ini dilaksanakan pada bulan Desember 2014 – Januari 2015. Metode yang digunakan dalam penelitian ini adalah metode deskriptif, sedangkan pengambilan sampel dilakukan menggunakan scoope net di tiga lokasi sampling yang memiliki umur vegetasi berbeda. Penelitian dilakukan selama 4 kali dalam 1 bulan dengan interval 1 minggu. Hasil penelitian didapatkan larva ikan di Stasiun I (8 bulan) sebanyak 109 indvidu, di Stasiun II (2 tahun) diperoleh larva ikan sebanyak 173 individu dan di Stasiun III (5 tahun) diperoleh sebanyak 429 individu. Keseluruhan larva ikan yang tertangkap terdiri dari 5 famili. Indeks keanekaragaman termasuk dalam kategori rendah dengan nilai berkisar antara 0,89-1,05, dengan nlai tertinggi di Stasiun III yaitu mangrove umur 5 tahun. Indeks keseragaman berkisar antara 0,56-0,65, nilai tertinggi juga pada Stasiun III dengan umur mangrove 5 tahun. Nilai indeks Dominasi berkisar antara 0,47-0,54, dengan nilai tertinggi pada Stasiun II. Dengan demikian dapat dilihat bahwa semakin tua umur mangrove semakin baik fungsinya sebagai penyedia habitat dan lindungan bagi ikan. Dapat dilihat juga bahwa komposisi larva ikan di ketiga stasiun penelitian relatif sama, namun kelimpahan yang paling banyak ditemukan di Stasiun III yang memiliki umur vegetasi lebih tua dibandingkan Stasiun I dan Stasiun II.

 

Mangrove in Timbulsloko Village area, Demak, which was originally broken is slowly rehabilitated through Mangrove Replant program (MR). These activities was influential in the formation of zoning by mangrove vegetation. Age of mangrove plant is expected to have an influence on the community structure of fish larvae that are in it. This study was conducted in December 2014 - January 2015. This study applying descriptive method, sampling was conducted using a scoope net in three sampling sites which have  different age vegetation. Sampling was conducted  4 times in one month at weekly interval. The results of the study obtained 109 individual fish larvae at the Station I (8 months old trees) 109, at the Station II (2 years old mangrove trees) obtained fish larvae as many as 173 individuals and at the Station III ( 5 years old mangrove trees) obtained as many as 429 individual. As a whole, fish larvae caught consist of 5 families. Diversity index considered low with score range between 0,89-1,05, for which the highest value owned by Station III ( 5 years old mangrove). Uniformity index ranged from 0,56-0,65, with the highest value in Station III (5 years old mangrove).  Domination index ranged from 0,47-0,54 , with the highest in Station II. Thus it can be seen that the older the mangrove age,  the better service they provide for the community . Beside that, even thought composition of fish larvae in three stations research are the same, the abundant most was in Station III, having the oldest vegetation compared to Station I and Station II .


Keywords


Struktur Komunitas Larva Ikan; Mangrove; Timbulsloko

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