Overgrazing of a large seagrass bed by the sea urchin Lytechinus variegatus in Outer Florida Bay
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چکیده
منابع مشابه
Making a mouth: elucidating morphogenetic events of mouth development in the sea urchin Lytechinus variegatus
Deuterostomes are bilaterian animals in which the blastopore, the site of gastrulation, becomes the anus and the mouth develops secondarily. Deuterostome phyla include Chordata, such as vertebrates like ourselves, and Echinodermata, such as sea urchins. The extent of homology among deuterostome mouths is unknown. To address this question, this thesis compares three aspects of mouth morphogenesi...
متن کاملA fate map of the vegetal plate of the sea urchin (Lytechinus variegatus) mesenchyme blastula.
Previous lineage tracing experiments have shown that the vegetal blastomers of cleavage stage embryos give rise to all the mesoderm and endoderm of the sea urchin larva. In these studies, vegetal blastomers were labeled no later than the sixth cleavage division (60-64 cell stage). In an earlier study we showed that single cells in the vegetal plate of the blastula stage Lytechinus variegatus em...
متن کاملAcetylcholinesterase in the sea urchin Lytechinus variegatus: characterization and developmental expression in larvae.
Acetylcholinesterase (AChE) in the echinoid Lytechinus variegatus has been characterized. Kinetic parameters V(max), K(m), K(ss), and b were 2594+/-1048 nmol ATCh hydrolyzed/min/mg tissue wet weight, 185+/-11 microM, 308+/-100 mM, and 0.2, respectively for the substrate ATCh and 17.8+/-6.87 nmol BTCh hydrolyzed/min/mg tissue wet weight, 654+/-424 microM, 36+/-31 mM, and 0.6, respectively for BT...
متن کاملA Description of the Complete Metamorphosis of the Sea Urchin Lytechinus Variegatus Cultured in Synthetic Sea Water
The urchin Lytechinus variegatus was cultured through metamorphosis, from eggs and sperm collected from mature forms, in synthetic sea water, in the laboratory. A unicellular green alga was used as the nutritional source. A description and photographic record are presented of the complete development from fertilized egg to adult. The general pattern of the metamorphosis of sea urchins has been ...
متن کاملCytotoxic Activity of Six Samples of Brazilian Propolis on Sea Urchin (Lytechinus variegatus) Eggs
The cytotoxic activities of extracts of four samples of propolis from the state of Minas Gerais (Southeast Brazil) and two from the state of Paraná (South Brazil) were evaluated using sea urchin (Lytechinus variegatus) eggs. Cytotoxic activity was observed, characterized mainly by the inhibition of the first cleavage of newly fertilized eggs. Methanol extracts at 32 µg mL(-1) of all samples wer...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 1999
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps190211