scholarly journals Hybrids of Two Closely Related Tropical Sea Urchins (Genus Echinometra): Evidence Against Postzygotic Isolating Mechanisms

2001 ◽  
Vol 200 (2) ◽  
pp. 97-106 ◽  
Author(s):  
M. Aminur Rahman ◽  
Tsuyoshi Uehara ◽  
John S. Pearse
Keyword(s):  
Sea Urchins ◽  
Isolating Mechanisms ◽  
Tropical Sea

scholarly journals Absence of postzygotic isolating mechanisms: evidence from experimental hybridization between two species of tropical sea urchins

2012 ◽  
Vol 13 (10) ◽  
pp. 797-810 ◽  
Author(s):  
M. Aminur Rahman ◽  
Tsuyoshi Uehara ◽  
Aziz Arshad ◽  
Fatimah Md. Yusoff ◽  
Mariana Nor Shamsudin
Keyword(s):  
Sea Urchins ◽  
Experimental Hybridization ◽  
Isolating Mechanisms ◽  
Tropical Sea

Survival of seaweeds ingested by three species of tropical sea urchins from Brazil

Hydrobiologia ◽  
1991 ◽  
Vol 222 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Mariana Cabral de Oliveira
Keyword(s):  
Sea Urchins ◽  
Tropical Sea

scholarly journals Embryonic, Larval, and Early Juvenile Development of the Tropical Sea Urchin,Salmacis sphaeroides(Echinodermata: Echinoidea)

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
M. Aminur Rahman ◽  
Fatimah Md. Yusoff ◽  
A. Arshad ◽  
Mariana Nor Shamsudin ◽  
S. M. N. Amin
Keyword(s):  
Sea Urchins ◽  
Morphological Changes ◽  
Sperm Concentration ◽  
Fertilization Rate ◽  
Life History Strategies ◽  
Early Juvenile ◽  
Culture Techniques ◽  
Unicellular Algae ◽  
Tropical Sea ◽  
Juvenile Development

Salmacis sphaeroides(Linnaeus, 1758) is one of the regular echinoids, occuring in the warm Indo-West Pacific, including Johor Straits, between Malaysia and Singapore. In order to investigate the developmental basis of morphological changes in embryos and larvae, we documented the ontogeny ofS. sphaeroidesin laboratory condition. Gametes were obtained from adult individuals by 0.5 M KCl injection into the coelomic cavity. Fertilization rate at limited sperm concentration (10−5dilution) was96.6±1.4% and the resulting embryos were reared at 24°C. First cleavage (2-cell), 4-cell, 8-cell, 16-cell, 32-cell, and multicell (Morulla) stages were achieved 01.12, 02.03, 02.28, 02.51, 03.12, and 03.32 h postfertilization. Ciliated blastulae with a mean length of174.72±4.43 μm hatched 08.45 h after sperm entry. The gastrulae formed 16.15 h postfertilization and the archenteron elongated constantly while ectodermal red-pigmented cells migrated synchronously to the apical plate. Pluteus larva started to feed unicellular algae in 2 d, grew continuously, and finally attained metamorphic competence in 35 d after fertilization. Metamorphosis took approximately 1 h 30 min from attachment to the complete resorption of larval tissues and the development of complete juvenile structure with adult spines, extended tubefeet and well-developed pedicellaria, the whole event of which usually took place within 1 d postsettlement. This study represents the first successful investigation on embryonic, larval, and early juvenile development ofS. sphaeroides. The findings would greatly be helpful towards the understanding of ontogeny and life-history strategies, which will facilitate us to develop the breeding, seed production, and culture techniques of sea urchins in captive condition.

scholarly journals The Roles of Spinochromes in Four Shallow Water Tropical Sea Urchins and Their Potential as Bioactive Pharmacological Agents

Marine Drugs ◽  
2017 ◽  
Vol 15 (6) ◽  
pp. 179 ◽  
Author(s):  
Lola Brasseur ◽  
Elise Hennebert ◽  
Laurence Fievez ◽  
Guillaume Caulier ◽  
Fabrice Bureau ◽  
...  
Keyword(s):  
Shallow Water ◽  
Sea Urchins ◽  
Pharmacological Agents ◽  
Tropical Sea

Ocean acidification affects parameters of immune response and extracellular pH in tropical sea urchins Lytechinus variegatus and Echinometra luccunter

2016 ◽  
Vol 180 ◽  
pp. 84-94 ◽  
Author(s):  
Débora Alvares Leite Figueiredo ◽  
Paola Cristina Branco ◽  
Douglas Amaral dos Santos ◽  
Andrews Krupinski Emerenciano ◽  
Renata Stecca Iunes ◽  
...  
Keyword(s):  
Immune Response ◽  
Ocean Acidification ◽  
Sea Urchins ◽  
Extracellular Ph ◽  
Lytechinus Variegatus ◽  
Tropical Sea

scholarly journals Genetic Analysis of Two Sympatric Sea Urchins from Genus Diadema (Echinodermata: Echinoidea: Diadematidae) from Malaysian Borneo

1970 ◽  
Vol 5 (1) ◽  
pp. 16-25
Author(s):  
Nursyuhaida Md Shahid ◽  
Raymie Nurhassan ◽  
Siti Akmar Khadijah Ab Rahim ◽  
Ruhana Hassan
Keyword(s):  
Posterior Probability ◽  
Sea Urchins ◽  
Strong Support ◽  
Sympatric Species ◽  
Bayesian Posterior Probability ◽  
Rrna Gene ◽  
16S Rrna Gene Analysis ◽  
Morphological Variations ◽  
Tropical Sea ◽  
Malaysian Borneo

Genus Diadema (Echinoidea: Diadematidae) has been reported to be the most widespread and ecologically important shallow water tropical sea urchins. Morphological variations and species distributions are complicated to elucidate due to complexity in making reliable identifications. Genus Diadema had involved in many debates, particularly on the mode of speciation and the specific status of Diadema setosum and Diadema savignyi. Therefore, relationships among Diadema species found in Malaysian Borneo have been examined using 16S rRNA gene analysis. Monophyletic clade of genus Diadema with respect to the outgroup was obtained with high bootstrap values of 100% (MP), 100% (NJ), 100% (ML) and Bayesian Posterior Probability is equal to 1.00. Two monophyletic clades were apparent separating D. setosum (Clade I) and D. savignyi (Clade II), with strong support of 100% (MP), 100% (NJ), 80% (ML) and Bayesian Posterior Probability is equal to 1.00. In addition, high genetic variation among species had been recorded (9.85%), suggesting that D. setosum and D. savignyi are two distinct entities. Furthermore, D. setosum and D. savignyi are sympatric species based on their distribution and overlapping ranges in Malaysian Borneo.

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