منابع مشابه
Photoreceptor Spike Responses in the Hardshell Clam, Mercenaria mercenaria
Spikes were recorded from single axons in the siphonal nerve of the hardshell clam Mercenaria mercenaria which respond to dimming of light. No axons were found to respond to the onset, or increase, of illumination. In a dark-adapted state there is little or no ongoing spike activity. The responsive area of a single axon is a circle of approximately 85 microm diameter on the inner siphon wall. T...
متن کاملOxidative burst in hard clam (Mercenaria mercenaria) haemocytes.
Haemocytes of bivalve molluscs are known to be responsible for many immunological functions, including recognition, phagocytosis, and killing or elimination of invading microorganisms, such as potentially infective bacteria and parasites. In many bivalves, killing of microorganisms engulfed by haemocytes is accomplished by a sudden release of reactive oxygen species (ROS) within the haemocytes;...
متن کاملComparative Growth and Survival of Juvenile Hard Clams, Mercenaria mercenaria, Fed Commercially Available Diets
Hobbyist and researchers often use commercially available phytoplankton concentrates to maintain filter feeding organisms held in their ornamental or experimental tanks. This study investigated the nutritional value of 10 products available commercially for juvenile hard clams, Mercenaria mercenaria. Growth and mortality rates in clams fed these products were compared with those found in clams ...
متن کاملSeasonal control of particle clearance by isolated gills from the clam Mercenaria mercenaria.
Pieces of gill isolated from the clam Mercenaria mercenaria clear colloidal graphite from seawater, and the clearance rates are measurable. 5-Hydroxytryptamine (5-HT) had a biphasic effect on clearance rates: concentrations from 10(-6) to 10(-5) mol l(-1) 5-HT increased clearance, but higher concentrations reduced it. During the summer, the gills were less responsive to 5-HT: the threshold incr...
متن کاملEnvironmental salinity modulates the effects of elevated CO2 levels on juvenile hard-shell clams, Mercenaria mercenaria.
Ocean acidification due to increasing atmospheric CO2 concentrations results in a decrease in seawater pH and shifts in the carbonate chemistry that can negatively affect marine organisms. Marine bivalves such as the hard-shell clam, Mercenaria mercenaria, serve as ecosystem engineers in estuaries and coastal zones of the western Atlantic and, as for many marine calcifiers, are sensitive to the...
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ژورنال
عنوان ژورنال: Limnology and Oceanography
سال: 1967
ISSN: 0024-3590
DOI: 10.4319/lo.1967.12.1.0172