scholarly journals The sea urchin Lytechinus variegatus lives close to the upper thermal limit for early development in a tropical lagoon

2016 ◽  
Vol 6 (16) ◽  
pp. 5623-5634 ◽  
Author(s):  
Rachel Collin ◽  
Kit Yu Karen Chan
Keyword(s):  
Early Development ◽  
Sea Urchin ◽  
Lytechinus Variegatus ◽  
Thermal Limit ◽  
Tropical Lagoon ◽  
Upper Thermal Limit

scholarly journals Effects of the secondary metabolites from Canistrocarpus cervicornis (Dictyotales, Phaeophyceae) on fertilization and early development of the sea urchin Lytechinus variegatus

2017 ◽  
Vol 41 (2) ◽  
pp. 296-304
Author(s):  
Fredy A. Ortiz-Ramírez ◽  
Magui Aparecida Vallim ◽  
Diana Negrão Cavalcanti ◽  
Valéria Laneuville Teixeira
Keyword(s):  
Natural Products ◽  
Secondary Metabolites ◽  
Early Development ◽  
Sea Urchin ◽  
Brown Alga ◽  
Marine Organisms ◽  
Lytechinus Variegatus ◽  
Male And Female ◽  
Canistrocarpus Cervicornis ◽  
Marine Brown Alga

Marine organisms are rich sources of natural products that, among other activities, help to maintain the species equilibrium. Samples of the marine brown alga Canistrocarpus cervicornis (Kützing) De Paula & De Clerck were collected in Búzios, Rio de Janeiro, Brazil, in June 2006. The extract was obtained in CH2Cl2 and subjected to fractionation by chromatographic methods in order to isolate and purify the compound (4R, 7R, 14S)-4α, 7α-diacethoxy-14-hydroxydolastane-1(15), 8-dien. Then, the effects of the extract and the dolastane diterpene on zygotes and gametes of the sea urchin Lytechinus variegatus were evaluated. The exposure of male and female gametes to the C. cervicornis extract promoted, respectively, a reduction of 10-30% in fertilization and a 20 to 70% decrease in the number of eggs. Furthermore, the exposure of zygotes to the extract inhibited their development up to 86.7 ± 1.6% (at a concentration of 250 µg mL-1), as well as generating abnormalities in 39-50% of zygotes. The results of the dolastane diterpene showed no evidence of inhibition in the zygotes’ development, thought it was proved to induce anomalies. At higher concentrations (25 and 50 µg mL-1), it was possible to observe cell lyses.

The effect of dietary protein on consumption, survival, growth and production of the sea urchin Lytechinus variegatus

Aquaculture ◽  
2006 ◽  
Vol 254 (1-4) ◽  
pp. 483-495 ◽  
Author(s):  
Hugh Hammer ◽  
Stephen Watts ◽  
Addison Lawrence ◽  
John Lawrence ◽  
Renee Desmond
Keyword(s):  
Sea Urchin ◽  
Dietary Protein ◽  
Lytechinus Variegatus

scholarly journals Select microRNAs are essential for early development in the sea urchin

2012 ◽  
Vol 362 (1) ◽  
pp. 104-113 ◽  
Author(s):  
Jia L. Song ◽  
Marlon Stoeckius ◽  
Jonas Maaskola ◽  
Marc Friedländer ◽  
Nadezda Stepicheva ◽  
...  
Keyword(s):  
Early Development ◽  
Sea Urchin

The impact of CO 2 -driven ocean acidification on early development and calcification in the sea urchin Strongylocentrotus intermedius

2016 ◽  
Vol 112 (1-2) ◽  
pp. 291-302 ◽  
Author(s):  
Yaoyao Zhan ◽  
Wanbin Hu ◽  
Weijie Zhang ◽  
Minbo Liu ◽  
Lizhu Duan ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Early Development ◽  
Sea Urchin ◽  
Strongylocentrotus Intermedius ◽  
The Impact

Synthesis of nuclear and cytoplasmic proteins in the early development of fishes and echinoderms

Development ◽  
1971 ◽  
Vol 26 (3) ◽  
pp. 611-622
Author(s):  
Maya R. Krigsgaber ◽  
Alla A. Kostomarova ◽  
Tamara A. Terekhova ◽  
Tatiana A. Burakova
Keyword(s):  
Amino Acids ◽  
Early Development ◽  
Sea Urchin ◽  
Nuclear Volume ◽  
Sea Urchin Embryos ◽  
Cytoplasmic Proteins ◽  
Specific Activities ◽  
Strongylocentrotus Nudus ◽  
Silver Grains ◽  
Misgurnus Fossilis

Synthesis of nuclear and cytoplasmic proteins was studied biochemically and autoradiographically in early loach (Misgurnus fossilis) and sea-urchin (Strongylocentrotus nudus) embryos. After incubation with [14C]amino acids for 5–120 min the ratio of the specific activities of nuclear, mitochondrial and 12000 g supernatant proteins was shown to be equal approximately to 6:1:2 in loach embryos and to 8:4:3 in sea-urchin embryos independently of the duration of labelling. After incubation with [3H]amino acids the number of silver grains per unit section was on the average 2·4 times higher for nuclei than it was for cytoplasm at mid-blastula and mid-gastrula stages. At the mid-gastrula the vegeto-animal gradient of protein synthesis was found. A higher level of the synthesis of nuclear proteins as compared with that of cytoplasmic proteins appears to be related to an increase in the nuclear volume and the nucleo-cytoplasmic ratio during the early development of the loach and sea-urchin embryos.

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