Consumption by herbivorous fishes of macroalgae exported from coral reef flat refuges to the reef slope

2013 ◽  
Vol 472 ◽  
pp. 87-99 ◽  
Author(s):  
J Stimson
PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1280 ◽  
Author(s):  
Atsushi Nanami

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.


2021 ◽  
Vol 13 (2) ◽  
pp. 269-281
Author(s):  
Nurhasima ◽  
Aditya Hikmat Nugraha ◽  
Dedy Kurniawan

The health of coral reef ecosystems can be seen through the emergence of coral recruitment. Aim of this research was to compared the scleractinia coral recruitment list based on genus, life form, and variations in size of the scleractinia coral recuit in the waters of Kampung Baru Lagoi and Teluk Bakau Village, Bintan Regency by geomorfology zone. The research was conducted using a Purposive sampling method in consideration of the presence of scleractinia coral in reef flat and reef slope areas using a 1x1 m square frame mounted along a 70 m transverse line parallel to the shoreline. Research has found 164 colonies of 24 genus dominated by Favia and Favites. Based on the most extensive life form of Coral encrusting and Coral massive variations in size 4.5-6 cm or medium category. The results of t test showed that the geomorphological differences in the research locations did not have a significant impact on the abundance of corals recruitment


2012 ◽  
Vol 117 (C3) ◽  
pp. n/a-n/a ◽  
Author(s):  
Emily C. Shaw ◽  
Ben I. McNeil ◽  
Bronte Tilbrook

2018 ◽  
Author(s):  
Nancy G. Prouty ◽  
Kimberly K. Yates ◽  
Nathan Smiley ◽  
Chris Gallagher ◽  
Olivia Cheriton ◽  
...  

Abstract. Constraining coral reef metabolism and carbon chemistry dynamics are fundamental for understanding and predicting reef vulnerability to rising coastal CO2 concentrations and decreasing seawater pH. However, few studies exist along reefs occupying densely inhabited shorelines with known input from land-based sources of pollution. The shallow coral reefs off Kahekili, West Maui, are exposed to nutrient-enriched, low-pH submarine groundwater discharge (SGD) and are particularly vulnerable to the compounding stressors from land-based sources of pollution and lower seawater pH. To constrain the carbonate chemistry system, nutrients and carbonate chemistry were measured along the Kahekili reef flat every 4 h over a 6-d sampling period in March 2016. Abiotic process – primarily SGD fluxes – controlled the carbonate chemistry adjacent to the primary SGD vent site, with nutrient-laden freshwater decreasing pH levels and favoring undersaturated aragonite saturation (Ωarag) conditions. In contrast, diurnal variability in the carbonate chemistry at other sites along the reef flat was driven by reef community metabolism. Superimposed on the diurnal signal was a transition during the second sampling period to a surplus of total alkalinity (TA) and dissolved inorganic carbon (DIC) compared to ocean end-member TA and DIC measurements. A shift from net community production and calcification to net respiration and carbonate dissolution was identified. This transition occurred during a period of increased SGD-driven nutrient loading, lower wave height, and reduced current speeds. This detailed study of carbon chemistry dynamics highlights the need to incorporate local effects of nearshore oceanographic processes into predictions of coral reef vulnerability and resilience.


Coral Reefs ◽  
2004 ◽  
Vol 23 (3) ◽  
pp. 386-396 ◽  
Author(s):  
Mark E. Baird ◽  
Moninya Roughan ◽  
Robert W. Brander ◽  
Jason H. Middleton ◽  
Greg J. Nippard

Coral Reefs ◽  
2014 ◽  
Vol 34 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Z. Loffler ◽  
D. R. Bellwood ◽  
A. S. Hoey

Author(s):  
KURT ROSENBERGER ◽  
CURT STORLAZZI ◽  
ANDREW POMEROY ◽  
OLIVIA CHERITON ◽  
RYAN LOWE ◽  
...  

Author(s):  
Guntur Guntur ◽  
Samsul Arifin ◽  
Oktiyas Muzaky Luthfi

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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