scholarly journals Genetic differentiation, reproductive mode, and gene flow in the brooding coral Pocillopora damicornis along the Great Barrier Reef, Australia

1997 ◽  
Vol 159 ◽  
pp. 175-187 ◽  
Author(s):  
DJ Ayre ◽  
TP Hughes ◽  
RJ Standish
Keyword(s):  
Gene Flow ◽  
Genetic Differentiation ◽  
Great Barrier Reef ◽  
Reproductive Mode ◽  
Barrier Reef ◽  
Pocillopora Damicornis ◽  
Brooding Coral

Gene Flow and Larval Duration in Seven Species of Fish from the Great Barrier Reef

Ecology ◽  
1995 ◽  
Vol 76 (8) ◽  
pp. 2373-2391 ◽  
Author(s):  
Peter J. Doherty ◽  
Serge Planes ◽  
Peter Mather
Keyword(s):  
Gene Flow ◽  
Great Barrier Reef ◽  
Larval Duration ◽  
Barrier Reef

Carbonate Dehydratase in Marine Organisms of the Great Barrier Reef

1976 ◽  
Vol 3 (1) ◽  
pp. 113 ◽  
Author(s):  
D Graham ◽  
RM Smillie
Keyword(s):  
Calcium Carbonate ◽  
Great Barrier Reef ◽  
Sea Water ◽  
Carbonic Anhydrase Activity ◽  
Enzymic Activity ◽  
Barrier Reef ◽  
Pocillopora Damicornis ◽  
Blue Green Algae ◽  
Calcium Carbonate Deposition ◽  
Dehydratase Activity

Carbonate dehydratase (EC 4.2.1.1, other name 'carbonic anhydrase') activity was found in 28 of 29 species of marine algae and angiosperms and in a mixed culture of phytoplankton collected in the vicinity of Lizard Island on the Great Barrier Reef of Australia. The species included 13 member- of the Chlorophyta, 4 of the Phaeophyta, 7 of the Rhodophyta, 2 of the Cyanophyta and 3 subs merged marine angiosperms. One of the two blue-green algae showed no detectable enzymic activity. The levels of activity ranged from 100 to 4800 units per milligram chlorophyll and were generally comparable with those of terrestrial angiosperms based on chlorophyll content, but were only a small fraction when compared on the basis of fresh weight. Culture of the green alga Chlorodesmis fastigiata in 'CO2-free' sea water (1.4 mg CO2 per litre) for 4 h did not lead to an induction of carbonate dehydratase activity. Some of the species of algae producing calcium carbonate contained the highest activities recorded but others had low activities. A correlation between high carbonate dehydratase activity and calcium carbonate deposition could not be adduced. Symbiotic zooxanthellae (Gymnodinium microadriaticum) of the hard coral Pocillopora damicornis and the clam Tridacna maxima also contained carbonate dehydratase (940 and 340 units per milligram chlorophyll, respectively). The host tissues contained about five times the activity of their respective zooxanthellae.

scholarly journals Asymmetric dispersal is a critical element of concordance between biophysical dispersal models and spatial genetic structure in Great Barrier Reef corals

2018 ◽  
Author(s):  
C Riginos ◽  
K Hock ◽  
AM Matias ◽  
PJ Mumby ◽  
MJH van Oppen ◽  
...  
Keyword(s):  
Gene Flow ◽  
Great Barrier Reef ◽  
Larval Dispersal ◽  
Coral Species ◽  
Spatial Genetic Structure ◽  
Critical Element ◽  
Barrier Reef ◽  
Long Distance ◽  
Biophysical Models ◽  
Asymmetric Dispersal

AbstractAimWidespread coral bleaching, crown-of-thorns seastar outbreaks, and tropical storms all threaten foundational coral species of the Great Barrier Reef, with impacts differing over time and space. Yet, dispersal via larval propagules could aid reef recovery by supplying new settlers and enabling the spread of adaptive variation among regions. Documenting and predicting spatial connections arising from planktonic larval dispersal in marine species, however, remains a formidable challenge.LocationThe Great Barrier Reef, AustraliaMethodsContemporary biophysical larval dispersal models were used to predict longdistance multigenerational connections for two common and foundational coral species (Acropora tenuisandAcropora millepora). Spatially extensive genetic surveys allowed us to infer signatures of asymmetric dispersal for these species and evaluate concordance against expectations from biophysical models using coalescent genetic simulations, directions of inferred gene flow, and spatial eigenvector modelling.ResultsAt long distances, biophysical models predicted a preponderance of north to south connections and genetic results matched these expectations: coalescent genetic simulations rejected an alternative scenario of historical isolation; the strongest signals of inferred gene flow were from north to south; and asymmetric eigenvectors derived from north to south connections in the biophysical models were significantly better predictors of spatial genetic patterns than eigenvectors derived from symmetric null spatial models.Main conclusionsResults are consistent with biophysical dispersal models yielding approximate summaries of past multigenerational gene flow conditioned upon directionality of connections. ForA. tenuisandA. millepora, northern and central reefs have been important sources to downstream southern reefs over the recent evolutionary past and should continue to provide southward gene flow. Endemic genetic diversity of southern reefs suggests substantial local recruitment and lack of long distance gene flow from south to north.

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