Investigating sea urchin densities critical to macroalgal control on degraded coral reefs

No. Panggil :	eja-21-0552
Nama Orang :	Dajka, Jan-Claas Beasley, Victoria Gendron, Gilberte Graham, Nicholas AJ






Penerbitan :	[Place of publication not identified] : Cambridge - Crime, 2021

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Abstrak	There is an assumption that tropical sea urchins are macroalgal grazers with the ability to con trol macroalgal expansion on degraded coral reefs. We surveyed abundances of Echinothrix calamaris, an urchin species common in the western Indian Ocean on 21 reefs of the inner Seychelles and predicted their density using habitat predictors in a modelling approach. Urchin densities were greatest on patch reef habitat types and declined with increasing macro algal cover. Next, we experimentally investigated the macroalgae-urchin relationship by pen ning two sea urchin densities on macroalgal fields. Over six weeks, the highest density treatment (4.44 urchins m-2 ) cleared 13% of macroalgal cover. This moderate impact leads us to conclude that controlling macroalgal expansion is not likely to be one of the main functions of E. calamaris in the inner Seychelles given the current densities we found in our surveys (mean: 0.02 urchins m-2 , maximum: 0.16 urchins m-2 ).
Entri Tambahan Nama Orang
001 Hak Akses (open/membership)	membership
Kata Kunci	Echinotrix calamaris; functional importance; habitat predictors; Sargassum; sea urchin grazing; Seychelles; penning
ISSN
Tahun Terbit	2021
No. Induk	eja-21-0552
Entri Sumber Data	Cambridge - Crime
Entri Utama Nama orang	Dajka, Jan-Claas; Beasley, Victoria; Gendron, Gilberte; Graham, Nicholas AJ
Volume, Nomor, Tahun dan Hlm.	vol. 48, no. 2, p. 136-141
Entri Utama Nama Badan
Barcode	eja-21-0552
Subjek Topik
Judul Utama	Investigating sea urchin densities critical to macroalgal control on degraded coral reefs
Kode Bahasa	eng
Sumber Koleksi	Perpustakaan Nasional