Density-dependent size regulation and negative growth in the sea urchin Diadema antillarum Philippi

Oecologia ◽  
1988 ◽  
Vol 76 (4) ◽  
pp. 627-629 ◽  
Author(s):  
Don R. Levitan
Keyword(s):  
Sea Urchin ◽  
Diadema Antillarum ◽  
Density Dependent ◽  
Size Regulation ◽  
Negative Growth

scholarly journals Biometric characteristics of the wild population of sea urchin Paracentrotus lividus (Lamarck, 1816) on the Tunisian coast

2021 ◽  
Author(s):  
F. Sellem ◽  
B. Bouhaouala-Zahar
Keyword(s):  
Sea Urchin ◽  
Wild Population ◽  
Multivariable Analysis ◽  
Paracentrotus Lividus ◽  
Biometric Data ◽  
Relative Growth ◽  
Tunisian Coast ◽  
Population Discrimination ◽  
Positive Growth ◽  
Negative Growth

AbstractThe present study was conducted to provide biometric data of the edible sea urchin Paracentrotus lividus along the Tunisian coastline where thirteen marine localities were selected randomly. A total of 653 individuals were collected and their metric and weight measurements were recorded. The size distribution of the different samples was determined and relative growth expressions were deduced. Data analysis showed that all localities’ samples of the wild population were dominated by one-size class, except Port Prince and Haouaria. Interestingly, only diameter-height relationships (D-H) were different between the geographical localities. Diameter-weight relationships (D-TW and D-TWTE) revealed a significant negative growth for all the localities, with the exception of Gammarth which showed positive growth for total weight (D-TW). Moreover, the multivariable analysis revealed divergences and/or similarities between metric and weight variables. Altogether, data highlights the inter-population discrimination with respect to geographic localization and clear segregation between the northern and the eastern localities demonstrated the plasticity of the species.

The effects of metals on embryo-larval and adult life stages of the sea urchin, Diadema antillarum

2005 ◽  
Vol 74 (3) ◽  
pp. 254-263 ◽  
Author(s):  
G.K. Bielmyer ◽  
K.V. Brix ◽  
T.R. Capo ◽  
M. Grosell
Keyword(s):  
Sea Urchin ◽  
Adult Life ◽  
Life Stages ◽  
Diadema Antillarum

scholarly journals Apparent stability of a low-density Diadema antillarum regime for Puerto Rican coral reefs

2018 ◽  
Vol 75 (6) ◽  
pp. 2193-2201 ◽  
Author(s):  
Ruber Rodríguez-Barreras ◽  
Alfredo Montañez-Acuña ◽  
Abimarie Otaño-Cruz ◽  
Scott D Ling
Keyword(s):  
Puerto Rico ◽  
Sea Urchin ◽  
Coral Cover ◽  
Live Coral ◽  
Low Density ◽  
Limited Evidence ◽  
Diadema Antillarum ◽  
Benthic Habitats ◽  
Stable Regime ◽  
Apparent Stability

Abstract Caribbean reefs have suffered decline in coral cover in recent decades due to recurrent anthropogenic and natural stressors. The regional collapse of the sea urchin Diadema antillarum, combined with overfishing, has contributed to a phase-shift of coral reef communities towards fleshy macroalgal dominance. Here, we examine the population dynamics of D. antillarum at five sites in Puerto Rico from 2011 to 2016 and determine trends between the sea urchin and local benthic habitats. The sea urchin population exhibited low but stable densities (with slight, but non-significant trend of increase), yet showed variability between sites. Large urchins (>60 mm test diam.) were the most abundant across sites and through time, followed by medium urchins (41–60 mm test diam.), whereas small individuals (<40 mm) were rare, indicating recruitment-limitation. Spatial and temporal differences in benthic habitats were not related to local D. antillarum abundances. Macroalgae cover declined at all sites over the 6 years, ranging 5–86%, whereas live coral cover also decreased across all sites (ranging 4–38%). Diadema antillarum populations in Puerto Rico appear stable with limited evidence for recovery trends back to pre-mass mortality densities. Full population recovery may take longer than expected; however, evidence indicates that the contemporary low-density D. antillarum population represents a novel stable regime.

Predation on a newly-stocked long-spined sea urchin (Diadema antillarum) by the batwing coral crab (Carpilius corallinus) on a coral reef restoration site

2021 ◽  
Author(s):  
William C Sharp ◽  
Brian A Reckenbeil
Keyword(s):  
Coral Reef ◽  
Sea Urchin ◽  
Reef Site ◽  
Diadema Antillarum ◽  
Ecological Processes ◽  
Reef Restoration ◽  
Restoration Site

This photograph documents a batwing coral crab (Carpilius corallinus) preying on the sea urchin (Diadema antillarum) on a coral reef site enhanced with artificial shelter and staghorn coral. This interaction illustrates an interaction that to be better understood to develop a restoration strategy that harnesses positive ecological processes.

Potential omnivory in the sea urchin Diadema antillarum?

2015 ◽  
Vol 2 ◽  
pp. 11-18 ◽  
Author(s):  
Ruber Rodríguez-Barreras ◽  
Elvira Cuevas ◽  
Nancy Cabanillas-Terán ◽  
Alberto M. Sabat
Keyword(s):  
Sea Urchin ◽  
Diadema Antillarum
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