Distribution of larvae ofPinnixa rathbuni Sakai (Decapoda: pinnotheridae) in Ise Bay and its neighbouring coastal waters, central Japan part 3. Aggregation of the benthic adult population with reference to the spatial distribution of the planktonic larvae

1983 ◽  
Vol 39 (3) ◽  
pp. 119-128 ◽  
Author(s):  
Hideo Sekiguchi
Keyword(s):  
Spatial Distribution ◽  
Coastal Waters ◽  
Adult Population ◽  
Central Japan ◽  
Ise Bay ◽  
Planktonic Larvae

scholarly journals Spatial distribution and abundance of nonindigenous coral genus Tubastraea (Cnidaria, Scleractinia) around Ilha Grande, Brazil

2005 ◽  
Vol 65 (4) ◽  
pp. 661-673 ◽  
Author(s):  
A. F. Paula ◽  
J. C. Creed
Keyword(s):  
Spatial Distribution ◽  
Coastal Waters ◽  
Sampling Methods ◽  
Geographic Range ◽  
Shallow Waters ◽  
Rocky Shores ◽  
Visual Estimation ◽  
Hard Substratum ◽  
Coral Genus ◽  
Different Depths

The distribution and abundance of azooxanthellate coral Tubastraea Lesson, 1829 were examined at different depths and their slope preference was measured on rocky shores on Ilha Grande, Brazil. Tubastraea is an ahermatypic scleractinian nonindigenous to Brazil, which probably arrived on a ship's hull or oil platform in the late 1980's. The exotic coral was found along a great geographic range of the Canal Central of Ilha Grande, extending over a distance of 25 km. The abundance of Tubastraea was quantified by depth, using three different sampling methods: colony density, visual estimation and intercept points (100) for percentage of cover. Tubastraea showed ample tolerance to temperature and desiccation since it was found more abundantly in very shallow waters (0.1-0.5 m), despite the fact that hard substratum is available at greater depths at all the stations sampled. At most sites, 1 to 5 colonies per 0.25 m² were found most frequently, but occasionally more than 50 colonies were found per 0.25 m², indicating a somewhat gregarious spatial distribution for this coral. The coral Tubastraea was found to occupy slopes of every possible angle in the Canal Central of Ilha Grande, but more colonies were found occupying slopes of 80 to 100°. Therefore, its insensitivity to angles of recruitment and its tolerance for different depths makes it an organism with great ecological tolerance, with a potential to colonize new areas and increase its current range in Brazil's coastal waters.

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