BERBEDA TAPI SAMA: PLASTISITAS MORFOLOGI SPONGE XESTOSPONGIA TESTUDINARIA DARI PERAIRAN KABUPATEN SITARO DAN SANGIHE?

DIFFERENT BUT SIMILAR: MORPHOLOGICAL PLASTICITY OF THE SPONGE XESTOSPONGIA TESTUDINARIA FROM SITARO AND SANGIHE ISLANDS?

  • Walter Balansa Politeknik Negeri Nusa Utara
  • Frets Rieuwpassa Politeknik Negeri Nusa Utara
Keywords: Xestospongia testudinaria, distribusi, plastisitas morfologi, morfotipe

Abstract

Plastisitas morfologi sponge telah lama menjadi tantangan berat dalam identifikasi jenis sponge dan mempunyai implikasi penting di bidang konservasi spesies, penemuan bahan bioaktif maupun biomaterial berpotensi medis dari invertebrata laut ini. Peran ekologis, kandungan senyawa bioaktif maupun variasi genetik dari X. testudinaria, sponge ikonik di terumbu karang Sulawesi Utara dan Indo-Pasifik ini, telah seringkali dilaporkan. Tetapi penelitian tentang plastisitas X. testudinaria masih sangat terbatas. Untuk menentukan plastisitias X. testudinaria dari Kabupaten Sitaro dan Sangihe, kami membandingkan karakteristik morfologi (contoh, warna, bentuk pertumbuhan, permukaan tubuh, ukuran dan bentuk spikula). Sejauh ini, tiga morfotipe sponge jenis Xestospongia testudinaria telah ditemukan di Kepulauan Sitaro dan Sangihe; (1) morfotipe digitate di Pulau Mahumu, (2) morfotipe lamellate di perairan Enepahembang dan Bebalang dan (3) morfotipe licin di Ulu Siau. Berbeda dengan studi plastisitas X. testudinaria sebelumnya, penelitian kami tidak menunjukkan adanya dominasi dari salah satu morfotipe ini di wilayah di sekitar pelabuhan laut dan daerah dengan masukan sedimentasi tinggi. Kami juga membahas implikasi dari penelitian ini untuk mendapatkan gambaran lebih baik mengenai distribusi berbagai morfotipe X. testudinaria di perairan Nusa Utara.

Morphological plasticity in sponge has become a serious challenge in sponge identification and has an important implication in species conservation. Ecological roles, bioactive compounds, and genetic variation of X. testudinaria, the iconic sponge from the coral reef in North Sulawesi and even Indo-Pacific, have been frequently reported. However, research on the plasticity of X. testudinaria remains limited. To determine the plasticity of this species from Sitaro and Sangihe Islands, we compared the morphological characteristics (e.g. color, growth form, surface, size and the style of spicule). So far, three morphotypes of X. testudinaria have been found in Sitaro and Sangihe Island regencies; digitate, lamellate and smooth surfaces. Different from earlier study on plasticity in X. testudinaria, our research did not show domination of any morphotype in areas near seaport and  high sedimentation. We also discussed the implication of this research to get a better understanding of the distribution of X. testudinaria with different morphotypes in Nusa Utara waters.

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Published
2022-12-21