نتایج جستجو برای: sea animals
تعداد نتایج: 340414 فیلتر نتایج به سال:
In previous work on antennal gland function in Crustacea the study of reabsorption of organic materials from the urine has been confined entirely to a consideration of carbohydrates, particularly glucose. For reviews of this earlier work, see Martin (1957) and Parry (i960). In Carcinus, as in other decapods, glucose is removed by active transport from urine passing through the antennal gland, t...
Sea turtles are a keystone species for the ocean’s ecosystem, with all currently being listed as endangered. Such threat is mainly due to human factors such fishing net entanglement. This entanglement often comes at expense of losing pectoral flipper. The reduction in sea turtle’s survival odds upon flipper significant concern. issue extends beyond individual animals, potential extinction could...
Marine litter is any persistent, manufactured or processed solid material discarded, disposed of or abandoned in the marine and coastal environment. Ingestion of marine litter can have lethal and sub-lethal effects on wildlife that accidentally ingests it, and sea turtles are particularly susceptible to this threat. The European Commission drafted the 2008/56/EC Marine Strategy Framework Direct...
The nucleotide sequences of 5S rRNA from three echinoderms, a sea-cucumber Stichopus oshimae, a starfish Asterina pectinifera and a sea-urchin Hemicentrotus pulcherrimus have been determined. These 5S rRNAs are all 120 nucleotides long. The echinoderm sequences are more related to the sequences of proterostomes animals such as mollusc, annelids and some others (87% identity on average) than to ...
Different sea urchin species show a vast variety of responses to variations in light intensity; however, despite this behavioral evidence for photosensitivity, light sensing in these animals has remained an enigma. Genome information of the recently sequenced purple sea urchin (Strongylocentrotus purpuratus) allowed us to address this question from a previously unexplored molecular perspective ...
A leading hypothesis to explain the dramatic decline of Steller sea lions (Eumetopias jubatus) in western Alaska during the latter part of the 20th century is a change in prey availability due to commercial fisheries. We tested this hypothesis by exploring the relationships between sea lion population trends, fishery catches, and the prey biomass accessible to sea lions around 33 rookeries betw...
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