Fishing down the reef slope: Characteristics of the nearshore deepwater fisheries of MesoAmerica

2021 ◽  
Vol 211 ◽  
pp. 105773
Author(s):  
Ivy E. Baremore ◽  
Rachel T. Graham ◽  
Matthew J. Witt
Keyword(s):  
Reef Slope

scholarly journals Pair formation, home range, and spatial variation in density, size and social status in blotched foxfaceSiganus unimaculatuson an Okinawan coral reef

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1280 ◽  
Author(s):  
Atsushi Nanami
Keyword(s):  
Coral Reef ◽  
Home Range ◽  
Spatial Variation ◽  
Reef Flat ◽  
Pair Formation ◽  
Size Class ◽  
Reef Slope ◽  
Rocky Reef ◽  
Seagrass Bed ◽  
Agonistic Display

The present study examined pair formation, spatial pattern of home range and spatial variation in density, size and social status of blotched foxfaceSiganus unimaculatus(family Siganidae) on an Okinawan coral reef. Of 32 pairs sampled for sexing, 31 (96.9%) were heterosexual and showed size-assortative pairing. Developed ovaries were found in April and July, whereas oocytes were immature in August, September and February. Heterosexual pairing was found in both reproductive and non-reproductive periods. Home range size tended to be positively related to fork length (FL). The degree of home range overlap for same size class pairs was smaller than that for different size class pairs. The intraspecific behavior when two pairs approached each other was categorized as ‘attack,’ ‘agonistic display’ and ‘no interactions,’ and the frequency of agonistic behaviors (“attack” or “agonistic display”) was significantly greater than “no interactions.” Underwater observations at a seagrass bed, a rocky reef flat and a sheltered reef slope revealed that the mean FL was significantly smaller at the sheltered reef slope (4–13 cm) than at the rocky reef flat (>13 cm). No individuals were found in the seagrass bed. Most individuals less than 6 cm FL were solitary, whereas most individuals over 7 cm FL were paired. Density was significantly greater on the sheltered reef slope than on the rocky reef flat.

Spatial distribution of chaetodontid fish in coral reefs of the Ryukyu Islands, southern Japan

1999 ◽  
Vol 79 (4) ◽  
pp. 725-735 ◽  
Author(s):  
L. Cadoret ◽  
M. Adjeroud ◽  
M. Tsuchiya
Keyword(s):  
Species Richness ◽  
Coral Reefs ◽  
Reef Slope ◽  
Data Matrix ◽  
Ryukyu Islands ◽  
Southern Japan ◽  
The Ryukyu Islands ◽  
The World ◽  
Species Richness And Abundance ◽  
Reef Edge

The spatial patterns of butterflyfish assemblages (Chaetodontidae) were examined within and between five islands of the Ryukyu Archipelago, southern Japan. Despite being the northernmost reef communities in the world and despite the severe natural and human-induced disturbances that have affected them since the 1970s, the coral reefs of the Ryukyu Islands have one of the most diversified assemblages of chaetodontids in the world. A total of 30 species were identified, and species richness per island ranged from 20 to 25 species. On each of the 45 stations prospected, between four and 17 species were recorded, and between 0.75 and 21.75 ind 250 m−2 were counted. Variation in species composition, species richness and abundance between islands was less pronounced than the variation within islands, where assemblages of the major reef environments (i.e. the reef flat, the reef edge, and the reef slope) were distinguished. The highest species richness and abundance were found on the reef slope and the reef edge. Canonical correspondence analysis revealed that depth, substrate complexity, and live coral cover influenced the distribution of chaetodontid fishes. These factors accounted for 20% of the variation in the species data matrix.

scholarly journals KOMPOSISI PENYUSUN TERUMBU KARANG TEPI (FRINGING REEF) DI PULAU MANDANGIN KABUPATEN SAMPANG, MADURA The Composition of Fringing Reef Formation in Pulau Mandangin, Sampang Province, Madura

2016 ◽  
Vol 11 (2) ◽  
pp. 94
Author(s):  
Guntur Guntur ◽  
Samsul Arifin ◽  
Oktiyas Muzaky Luthfi
Keyword(s):  
Coral Reef ◽  
Reef Slope ◽  
Small Island ◽  
Dead Coral ◽  
Fringing Reef ◽  
Transect Line ◽  
Base Substrate ◽  
Line Intercept ◽  
Substrate Types ◽  
Reef Formation

ABSTRAK   Terumbu karang tepi di Pulau Mandangin tersusun substrat biotik dan abiotik dengan kedalaman tidak lebih dari 40 m. Pulau Mandangin adalah pulau kecil yang memiliki komposisi substrat dasar seperti terumbu karang dan perairannya yaitu zona leeward dan zona windward. Zona leeward adalah sisi yang membelakangi arah datangnya angin, sedangkan zona windward adalah sisi yang menghadap arah datangnya angin. Tujuan dari penelitian ini adalah untuk mengetahui komposisi penyusun terumbu karang tepi (fringing reef) dan mengetahui perbedaan komposisi penyusun terumbu karang tepi (fringing reef) antara zona leeward dan zona windward di Pulau Mandangin. Metode yang digunakan adalah Line Intercept Transect (LIT) secara vertikal, LIT dimulai dari surut terendah sampai daerah reef slope dan dilakukan pencatatan semua jenis substrat yang dibawah garis transek. Hasil penelitian menunjukkan zona fringing reef yang mengelilingi Pulau Mandangin tersusun atas substrat rubble, sand, alga, rock, dead coral, dead coral with algae, sponge, coral massive dan coral submassive. Zona leeward lebih bervariasi dari zona windward dalam susunan fringing reef. Hal ini karena angin yang terjadi di zona windward lebih besar dari zona leeward, sehingga substrat di zona windward hanya rubble dan sand.   Kata kunci: Fringing reef, zona windward, zona leeward, substrat, Pulau Mandangin     ABSTRACT  Fringing reef in Mandangin Island comprises of biotic and abiotic substrates in depth not more than 40 m. Mandangin Island is a small island with base substrate composition mostly involving coral reef. The waters include leeward and windward zones. Leeward zone is paralleling with wind incoming direction, whereas windward zone is facing on wind incoming direction. The objective of research is to understand the composition that constitutes fringing reef and to recognize different constitutive composition of fringing reef at leeward zone and windward zone in Mandangin Island. Method of research is Line Intercept Transect (LIT) that is applied vertically. LIT starts from the lowest ebb toward the reef slope zone, and it involves registering all substrate types below transect line. Result of research indicates that fringing zone surrounding Mandangin Island consists of various substrates such as rubble, sand, alga, rock, dead coral, dead coral with algae, sponge, coral massive and coral sub-massive. Leeward zone is more diversified in fringing reef composition than windward zone. It is evident because wind occurrence at windward zone is higher than at leeward zone, and thus, substrates at windward zone include only rubble and sand. Keywords: Fringing reef, windward zone, leeward zone, substrates, Mandangin Island

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