ADAPTASI MORFOLOGI (THALLUS DAN HOLDFAST) RUMPUT LAUT DENGAN VARIASI SUBSTRAT DI PERAIRAN TELUK AWUR KABUPATEN JEPARA

Dewi, R. 1), D. Sanjayasari 1) dan Wijayanto 2)

1. Staf Pengajar Jurusan Perikanan dan Kelautan, Fakultas Sains dan Teknik UNSOED, Purwokerto. Email : raysa_ose@yahoo.com
2. Mahasiswa Jurusan Perikanan dan Kelautan, UNSOED, Purwokerto.

Diterima 22 Februari 2012; disetujui 6 Maret 2012

ABSTRACT

Indonesia is one of potentially country especially as seaweeds resources. The holdfast and thalus adaptation achieve 555 variations. The most affect in the form of those adaptations is substrate. The seaweed substrate classify in to three forms mud, dead coral, sand and sometimes it could attach in ephyphitic plants. The research was established at Teluk Awur Jepara. It was used stratified random sampling with line transect in intertidal area 100m length. It was consist of three stations with 50 m space between station and three replications vertically and horizontally. The data were analyzed descriptively, with variation index and domination of seaweed correlated to types of substrate as the parameter. The result showed that there were 7 seaweeds species identified; Padina australis; Sargassum cinereum; Sargassum polycystum; Sargassum crassifolium; Dicyota bartayresiana; Gracilaria salicornia dan Halimeda opuntia. There were three types of substrate (a) sand/ dead coral, (b) stone, and (c) mud. The highest variation index was 1,419 on sands/ dead coral substrates. The highest domination index was 0,534 on mud substrate. The physics and chemicals parameters were in seaweed growth standard.

Keywords : holdfast, thalus, adaptation, substrate

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