نتایج جستجو برای: diadema setosum
تعداد نتایج: 386 فیلتر نتایج به سال:
A long-spined sea urchin Diadema-sp reported from Japanese waters was genetically distinct from all known Diadema species, but it remained undescribed. Extensive field surveys in Japan with molecular identification performed in the present study determined five phenotypes (I to V) in Diadema-sp according to the presence and/or shape of a white streak and blue iridophore lines in the naked space...
The Eastern Mediterranean basin is facing a high invasion rate of mainly Indo-Pacific species entering through the Suez Canal. The needlespined urchin, Diadema setosum, was first documented in the Mediterranean in 2006 off southern Turkey. The new record of D. setosum in September 2009 represents the first evidence of its presence in Lebanese coastal waters.
Four long-spined sea urchin species in the genus Diadema are known to occur around the Japanese Archipelago. Three species (D. savignyi, D. setosum, and D. paucispinum) are widely distributed in the Indo-Pacific Ocean. The fourth species was detected by DNA analysis among samples originally collected as D. savignyi or D. setosum in Japan and the Marshall Islands and tentatively designated as Di...
In 2021, three specimens of the Lessepsian yellowstripe barracuda Sphyraena chrysotaenia and eight Indo-Pacific needle-spined sea urchin Diadema setosum were recorded along coasts Zakynthos Island, some within Marine Protected Area.
Electrical activity in the radial nerve cord of the sea urchin Diadema setosum has recently been reported by Takahashi (1964), who recorded nerve impulses following direct photic stimulation of the isolated nerve cord. No other electrical activity has been recorded from sea-urchin nervous systems. The following is a report on electrical phenomena in the isolated radial nerve cord and ampullae o...
diadema setosum (leske, 1778), is one of the common echinoids widely distributed in the indo-west pacific ocean, where it occurs from the red sea, persian gulf and the east coast of africa to japan, australia and malaysia. to investigate the developmental basis of morphological changes in embryos and larvae, we documented the ontogeny of d. setosum in a controlled laboratory condition at the in...
As global warming and climate-change proceeds ever more rapidly, organisms depending on seasonal cues to synchronize reproduction face an unclear future. Reproduction in Diadema setosum in the Gulf of Aqaba (Red Sea) is seasonal, with mature individuals occurring from July to October. Gonad indexes (GI), in contrast, indicate that spawning occurs from August through December and suggests two ma...
Sea urchins were ecologically and economically important biota, but scientific information on sea is still very minimal there no ongoing monitoring. The purpose of this study was to determine the density, abundance, community structure, distribution patterns in intertidal zone Karanrang Island, Pangkep Regency. research June-July 2022 carried out at high low tide using three transects measuring...
species identification is always important. records of sea urchins and sand dollars species (echinodermata, echinoidea) is given from iranian waters. nine species of echinoderms were identified through the study. the species identification was made using morphological characteristics and review of checklist key. nine species were identified here, including echinometra mathaei, prionocidari...
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