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Oceanographic Factors on Coastal Aggregation of Reef Manta (Mobula alfredi) in The Manta Sandy, Raja Ampat, Indonesia

ILMU KELAUTAN: Indonesian Journal of Marine Sciences · Vol. 27 No. 4 (2022) · hlm. 330–340

DOI
10.14710/ik.ijms.27.4.330-340
ISSN
2406-7598, 0853-7291
Terbit
2022-12-01
Penerbit
Marine Science Department Diponegoro University
Bahasa
eng
Lisensi
creativecommons.org/licenses/by-sa/4.0

Abstrak

Reef Manta rays (Mobula alfredi) is an iconic species and under the IUCN Red List of Threatened Species it is classified as vulnerable. Although the decline of population has been reported due to their very high demand and economic value especially for their dried gill plates, they are present all year round at Manta Sandy, Dampier Strait, Raja Ampat, Indonesia. The appearance of M. alfredi may affected by environmental factors. Therefore, this study was aimed to determine the sighted frequency of M. alfredi and their related environmental factors during east and west monsoon. Underwater Visual Census (UVC) and camera trap (PhotoID) method were used to observe the appearance of M. alfredi. The remotely oceanographic data, such as sea surface temperature, chlorophyll-a, sea surface current and tidal data, in the same M. alfredi observation time were obtained from the web of www.oceancolor.gsfc.nasa.gov, www.Hycom.org, Geospatial Information Agency (GIA) and then analyzed using Seadas, Excel, and ArcMap (Geographic Information System). The results showed that during the west monsoon M. alfredi appeared more often (174 sighting) than in the east monsoon (5 sighting). Those appearances were connected with slightly warmer sea surface temperature and high value phytoplankton which is related to zooplankton. For planktivorous elasmobranch, lower sea surface current and high tidal value affect the distribution of zooplankton in those area, so give high feeding opportunity for M. alfredi. High sighted M. alfredi during west monsoon in Manta Sandy attract tourists, therefore regulation for their conservation need to be implemented.

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  • Diponegoro University
  • State University of Semarang
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  • Organisasi berbeda
  • Organisasi sama
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Rekan penulisOrganisasiArtikel bersama
Muhammad ZainuriDiponegoro University4
Retno HartatiDiponegoro University4
Widianingsih WidianingsihDiponegoro University4
Endang KusdiyantiniDiponegoro University4
Hermin Pancasakti KusumaningrumDiponegoro University3
Valentina R. IrianiDiponegoro University2
Muhammad ZaenuriAfiliasi tidak diketahui2
Ita RiniatsihDiponegoro University2
Sri RedjekiDiponegoro University2
Ambariyanto AmbariyantoAfiliasi tidak diketahui1
Candhika YusufAfiliasi tidak diketahui1
Agus IndarjoDiponegoro University1
Galung Dhiva MaharaniDiponegoro University1
S. SuryonoDiponegoro University1
Suryono SuryonoDiponegoro University1
Chrisna Adhi SuryonoDiponegoro University1
Rudhi PribadiDiponegoro University1
Ibnu PratiktoDiponegoro University1
Muhammad Ajie ZaenuriAfiliasi tidak diketahui1
Widianingsih WidianingsihAfiliasi tidak diketahui1
Hermin Pancasakti KusumaningrumDiponegoro University1
Ambariyanto AmbariyantoDiponegoro University1
Ria AzizahDiponegoro University1
Irwani IrwaniDiponegoro University1
Ervia YudiatiDiponegoro University1
Muhammad ZaenuriState University of Semarang1

Afiliasi berasal dari OpenAlex; metadata OAI-PMH jurnal tidak memuatnya. Penulis tanpa ID OpenAlex dicocokkan berdasarkan nama, sehingga dua orang bisa tergabung atau satu orang bisa terpisah.

Sumber metadata: OAI-PMH (metadata jurnal) http://ejournal.undip.ac.id/index.php/ijms/oai, pertama di-harvest 8 Nov 2026, terakhir terlihat 8 Nov 2026.
Metadata asli (oai_dc) 
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	<dc:title xml:lang="en-US">Oceanographic Factors on Coastal Aggregation of Reef Manta (Mobula alfredi) in The Manta Sandy, Raja Ampat, Indonesia</dc:title>
	<dc:creator>Ahsin, Awaludin</dc:creator>
	<dc:creator>Hartati, Retno</dc:creator>
	<dc:creator>Widianingsih, Widianingsih</dc:creator>
	<dc:creator>Sitorus, Erlangga D.</dc:creator>
	<dc:creator>Azizah, Hidayati</dc:creator>
	<dc:creator>Endrawati, Hadi</dc:creator>
	<dc:subject xml:lang="en-US">M. alfredi; Photo Identification; SST; Chlorophyll-a; Manta Sandy</dc:subject>
	<dc:description xml:lang="en-US">Reef Manta rays (Mobula alfredi) is an iconic species and under the IUCN Red List of Threatened Species it is classified as vulnerable. Although the decline of population has been reported due to their very high demand and economic value especially for their dried gill plates, they are present all year round at Manta Sandy, Dampier Strait, Raja Ampat, Indonesia. The appearance of M. alfredi may affected by environmental factors. Therefore, this study was aimed to determine the sighted frequency of M. alfredi and their related environmental factors during east and west monsoon. Underwater Visual Census (UVC) and camera trap (PhotoID) method were used to observe the appearance of M. alfredi. The remotely oceanographic data, such as sea surface temperature, chlorophyll-a, sea surface current and tidal data, in the same M. alfredi observation time were obtained from the web of www.oceancolor.gsfc.nasa.gov, www.Hycom.org, Geospatial Information Agency (GIA) and then analyzed using Seadas, Excel, and ArcMap (Geographic Information System). The results showed that during the west monsoon M. alfredi appeared more often (174 sighting) than in the east monsoon (5 sighting). Those appearances were connected with slightly warmer sea surface temperature and high value phytoplankton which is related to zooplankton. For planktivorous elasmobranch, lower sea surface current and high tidal value affect the distribution of zooplankton in those area, so give high feeding opportunity for M. alfredi. High sighted M. alfredi during west monsoon in Manta Sandy attract tourists, therefore regulation for their conservation need to be implemented. </dc:description>
	<dc:publisher xml:lang="en-US">Marine Science Department Diponegoro University</dc:publisher>
	<dc:date>2022-12-01</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
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	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://ejournal.undip.ac.id/index.php/ijms/article/view/46537</dc:identifier>
	<dc:identifier>10.14710/ik.ijms.27.4.330-340</dc:identifier>
	<dc:source xml:lang="en-US">ILMU KELAUTAN: Indonesian Journal of Marine Sciences; Vol 27, No 4 (2022): Ilmu Kelautan; 330-340</dc:source>
	<dc:source>2406-7598</dc:source>
	<dc:source>0853-7291</dc:source>
	<dc:language>eng</dc:language>
	<dc:relation>https://ejournal.undip.ac.id/index.php/ijms/article/view/46537/pdf</dc:relation>
	<dc:relation>https://ejournal.undip.ac.id/index.php/ijms/article/downloadSuppFile/46537/10807</dc:relation>
	<dc:rights xml:lang="en-US">Copyright (c) 2022 ILMU KELAUTAN: Indonesian Journal of Marine Sciences</dc:rights>
	<dc:rights xml:lang="en-US">https://creativecommons.org/licenses/by-sa/4.0</dc:rights>
</oai_dc:dc>