scholarly journals Slow population turnover in the soft coral genera Sinularia and Sarcophyton on mid- and outer-shelf reefs of the Great Barrier Reef

1995 ◽  
Vol 126 ◽  
pp. 145-152 ◽  
Author(s):  
KE Fabricius
Keyword(s):  
Great Barrier Reef ◽  
Soft Coral ◽  
Outer Shelf ◽  
Barrier Reef ◽  
Population Turnover

scholarly journals Cross-Shelf Variation Among Juvenile and Adult Coral Assemblages on Australia’s Great Barrier Reef

Diversity ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 85 ◽  
Author(s):  
Michelle J. Jonker ◽  
Angus A. Thompson ◽  
Patricia Menéndez ◽  
Kate Osborne
Keyword(s):  
Great Barrier Reef ◽  
Coral Cover ◽  
Synergistic Effects ◽  
Outer Shelf ◽  
Lower Latitude ◽  
Barrier Reef ◽  
Hard Coral ◽  
Coral Abundance ◽  
The Status ◽  
Community Types

Coral reefs are under increasing pressure from a variety of stressors, highlighting the need for information about the status of coral reef communities including the distribution, abundance and composition of juvenile and adult coral assemblages. This information is currently limited for the Great Barrier Reef (GBR) and is necessary for understanding the impacts of disturbances and the system’s potential for recovery. This study reports juvenile and adult hard coral abundance and composition from 122 reefs on the GBR during a period of limited acute disturbance. The data represent baseline observations for juvenile hard coral assemblages spanning the longitudinal cross-shelf gradient of the GBR and 12 degrees of latitude and augment reported distribution of adult coral assemblages over the same scale with inclusion of additional reefs. Juvenile and adult coral assemblages reflected broad differences imposed by the gradient of environmental conditions across the GBR. The mean density of juvenile hard corals was lower in the inshore reefs (5.51 m2) than at either the mid-shelf (11.8 m2) or outer shelf reefs (11.2 m2). The composition of juvenile and adult coral assemblages covaried overall, although there were different relationships between these two life stages across the continental shelf and among community types. Dissimilarity between juvenile and adult coral assemblages was greater on inshore and outer shelf reefs than on reefs in the mid-shelf, although, there were differences in community types both within these shelf positions and those that spanned mid- and outer shelf reefs. Dissimilarity was greatest for Inshore branching Acropora and high for Southern Acropora communities, although very high coral cover and very low juvenile densities at these reefs precluded interpretation beyond the clear competitive dominance of Acropora on those reefs. Dissimilarity was also high between juvenile and adult coral assemblages of Turbid inshore communities suggesting water quality pressures, along with synergistic effects of other stressors, pose ongoing selective pressures beyond the juvenile stage. Conversely, relatively low dissimilarity between juvenile and adult coral assemblages on mid-shelf and lower latitude outer shelf reefs suggests pressures beyond those influencing settlement and early post-settlement survival were having less influence on the composition of adult coral assemblages.

Diversity, abundance, and distribution of reef sharks on outer-shelf reefs of the Great Barrier Reef, Australia

2014 ◽  
Vol 161 (12) ◽  
pp. 2847-2855 ◽  
Author(s):  
Justin R. Rizzari ◽  
Ashley J. Frisch ◽  
Katalin A. Magnenat
Keyword(s):  
Great Barrier Reef ◽  
Outer Shelf ◽  
Barrier Reef ◽  
Reef Sharks ◽  
Abundance And Distribution

Two new species of alcyonacean-associated shrimp genus Alcyonohippolyte Marin, Okuno & Chan, 2010 (Crustacea: Decapoda: Hippolytidae) from the Great Barrier Reef of Australia

Zootaxa ◽  
2011 ◽  
Vol 3123 (1) ◽  
pp. 49 ◽  
Author(s):  
IVAN MARIN
Keyword(s):  
New Species ◽  
Great Barrier Reef ◽  
Soft Coral ◽  
Barrier Reef ◽  
Lizard Island ◽  
Two New Species ◽  
Organ Pipe ◽  
Antennular Peduncle

Two new species of symbiotic hippolytid shrimps of the genus Alcyonohippolyte Marin, Okuno & Chan, 2010 are described from Lizard Island, the Great Barrier Reef of Australia. Alcyonohippolyte tenuicarpus sp. nov. is associated with xeniid soft coral of the genus Heteroxenia Kolliker, 1874 and differs from the congeners by a long rostrum greatly exceeding antennular peduncle and slender carpal segments of pereiopod II. Alcyonohippolyte tubiporae sp. nov. is associated with organ pipe coral of the genus Tubipora Linnaeus, 1758, possibly T. musica Linnaeus, 1758 (Alcyonacea: Tubiporidae), and differs from the congeners by equal distal and proximal carpal segments of pereiopod II. Both species can be clearly separated from the congeners ecologically and by coloration.

scholarly journals Cross-shelf distribution patterns of tropical juvenile cephalopods sampled with light-traps

1995 ◽  
Vol 46 (4) ◽  
pp. 707 ◽  
Author(s):  
NA Moltschaniwskyj ◽  
PJ Doherty
Keyword(s):  
Great Barrier Reef ◽  
Distribution Patterns ◽  
Present Knowledge ◽  
Outer Shelf ◽  
Barrier Reef ◽  
Light Traps ◽  
Coral Sea ◽  
Reef Environments ◽  
High Concentrations ◽  
Abundant Genus

This paper describes the cephalopod genera caught with light-traps at different locations and depths in the waters of the central Great Barrier Reef (GBR). Multiple stations were sampled in four locations: (I) the coastal GBR Lagoon, (2) inter-reef passages (Magnetic and Palm), (3) near-reef environments (Keeper, Helix, Faraday and Myrmidon) ranging from mid- to outer-shelf locations, and (4) the Coral Sea. A total of 13 cephalopod genera was caught from monthly cruises conducted from October to January of 1990-91 and 1991-92. Octopus, the most abundant juvenile cephalopod, was present in relatively high numbers at all shelf locations; few were caught in the Coral Sea. Photololigo, the most abundant squid, was rarely caught outside the GBR Lagoon. In contrast, Sthenoteuthis, the second most abundant squid, was caught at all locations. Deep samples from most locations were dominated by Octopus. Abralia was found only near the bottom of the GBR Lagoon; in contrast, Euprymna, the fourth most abundant genus, was collected only at the surface. Cephalopod communities from the GBR Lagoon had higher abundances of Octopus, Photololigo and Abralia compared with communities from the three other areas. Reef passages and reef locations shared similar communities, with the squid component dominated by Sthenoteuthis. Very low numbers of cephalopods were caught in the Coral Sea by light attraction. High concentrations of cephalopods detected in the middle of the GBR Lagoon are consistent with present knowledge about oceanographic processes over this shelf.

Predation on soft corals (Octocorallia: Alcyonacea) on the Great Barrier Reef, Australia

1994 ◽  
Vol 45 (7) ◽  
pp. 1281 ◽  
Author(s):  
JK Griffith
Keyword(s):  
Great Barrier Reef ◽  
Soft Coral ◽  
Barrier Reef ◽  
Soft Corals ◽  
Quantitative Evidence ◽  
Bite Marks ◽  
First Time ◽  
Predation Rates

Quantitative evidence on predation rates on soft corals is presented for the first time. These measured predation rates were low. Less than 1% of the soft coral colonies present in mapped areas at Heron Island and Beaver Reefs had bite marks. Evidence suggests that over 51% of these bite marks were more than two months old. Predators included the mollusc Ovula ovum and two species of chaetodontid fishes that have not been recorded before as feeding on soft corals.

scholarly journals Flushing time of solutes and pollutants in the central Great Barrier Reef lagoon, Australia

2007 ◽  
Vol 58 (8) ◽  
pp. 778 ◽  
Author(s):  
Yonghong Wang ◽  
Peter V. Ridd ◽  
Mal L. Heron ◽  
Thomas C. Stieglitz ◽  
Alan R. Orpin
Keyword(s):  
Diffusion Coefficient ◽  
Great Barrier Reef ◽  
Diffusion Model ◽  
Outer Shelf ◽  
Barrier Reef ◽  
Flushing Time ◽  
Reef Lagoon ◽  
Exchange Processes ◽  
Offshore Reef ◽  
Outer Half

The flushing time of the central Great Barrier Reef lagoon was determined by using salinity as a tracer and developing both an exchange model and a diffusion model of the shelf exchange processes. Modelling suggests that the cross-shelf diffusion coefficient is approximately constant for the outer half of the lagoon but decays rapidly closer to the coast. The typical outer-shelf diffusion coefficient is ~1400 m2 s–1, dropping to less than 100 m2 s–1 close to the coast. Flushing times are around 40 days for water close to the coast and 14 days for water in the offshore reef matrix.

scholarly journals Latitudinal and Cross-Shelf Patterns of Size, Age, Growth, and Mortality of a Tropical Damselfish Acanthochromis polyacanthus on the Great Barrier Reef

Diversity ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 67 ◽  
Author(s):  
Michael Kingsford ◽  
David Welch ◽  
Mark O’Callaghan
Keyword(s):  
Great Barrier Reef ◽  
Spatial Models ◽  
Outer Shelf ◽  
Age And Growth ◽  
Color Morph ◽  
Barrier Reef ◽  
Geographical Patterns ◽  
Continental Shelves ◽  
Demographic Patterns ◽  
Negative Linear Relationship

Patterns of age and growth of a sedentary damsel fish Acanthochromis polyacanthus were tested over a latitudinal range of approximately 10 degrees (1200 km) on the Great Barrier Reef (GBR), Australia. Within latitudes, these patterns were also compared on reefs in distance strata (inner, mid, and outer) across a continental shelf that ranged in width from 52 to 128 km. Although variation in length-max (SLMAX), growth, age-max (AMAX), and the von Bertalanffy metrics of Linf and K were found within and among latitudes, the greatest variation in some demographic characteristics was found among distance strata across the shelf regardless of latitude. Fish were always relatively smaller at inner shelf reefs and grew more slowly when compared to mid and outer shelf reefs; this was true regardless of the color morph of fish. The oldest fish collected was 11 years old, and there was no consistent variation in age-max among distances from shore. On outer reefs, there was a negative linear relationship with age-max and latitude. This “tropical gradient” of age only explained 34% of the variation; furthermore, this was not found when only the oldest group of fish was considered (top 10%). Fish only reached an age-max of six years on the southernmost reefs. There was a trend for a smaller Linf with latitude but it was not significant and Linf did not vary predictably with water temperature. The sampling of marine protected areas (MPAs) and fished zones did not confound the resultant patterns in that fish were not consistently larger or older in MPAs or fished zones. Instantaneous mortality rates were 0.245–0.685; they were highest at inner reefs and also showed no consistent MPA-related patterns. Our study suggested that the mid and outer shelf waters of the GBR appeared best suited for growth of A. polyacanthus. In conclusion, the position on continental shelves dominated other geographical patterns and needs to be considered in spatial models of growth. We suggest that local environmental conditions such as turbidity and the quality and quantity of plankton likely have a strong influence on distance across the shelf-based demographic patterns of planktivores.

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