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Related to ark shells: Arcidae, scallop shells
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Malondialdehyde content in CFH was significantly higher (P < 0.01) 48 h after the ark shells were exposed to 32[degrees]C compared with that of the initial value, followed by a significant decrease (P < 0.01) after 1 h of recovery.
As shown in Figure 3B, MDA contents in HL of stressed ark shells decreased significantly, regardless of temperature (P < 0.01), compared with the initial values after 1 h (both stress and recovery periods), followed by complete recovery by the end of the experiment.
ABSTRACT The present study investigated whether an acute temperature change affected hemolymph antioxidant enzyme activities and lipid peroxidation in ark shell Scapharca subcrenala transferred from 22[degrees]C to 17[degrees]C, 27[degrees]C, and 32[degrees]C for 72 h and then transferred back quickly to 22[degrees]C for a 6-h recovery period.
The potential for genetic exchange has recently increased among northeast Asian ark shell populations due to commercial purposes and the uncontrolled bulk release of nonnative genetic variants.
The aim of the current study was to evaluate the genetic diversity and genetic structure among five wild populations of ark shell collected from three localities in Japan and one locality each from Korea and China.
Lee and Kim (2003) reported that the nucleotide sequences of unidentified ark shell imported from China were identical to 5.
Flowever, the estimated maximum age of ark shells from Sendai Bay in this study was 20 y, which is far older than the age estimated by substituting the largest size of collected specimens into the von Bertalanffy growth model obtained using shell outer growth ring data (i.e., 8 y old) (Fisheries Agency 1977).
The shell growth patterns of ark shells did not differ significantly between the northern and southern areas of Sendai Bay.
ABSTRACT The reproductive biology and glycogen content of a subcrenated ark shell Scapharca kagoshimensis (Tokunaga, 1906) in Ariake Bay were investigated from April 2004 to May 2005 in relation to environmental factors such as water temperature, salinity, and plankton settled volume.
KEY WORDS: subcrenated ark shell, Scapharca kagoshimensis, gametogenesis, reproductive cycle, glycogen content
ABSTRACT Over the period from June 2002 to June 2003, we examined the relationship of seasonal changes in the mass of the gonad and somatic tissues to environmental factors for four size groups of the zebra ark shell Arca zebra at Chacopata, in northeastern Venezuela.
In this study we examine changes in the mass of the gonads and somatic tissues of the tropical zebra ark shell Arca zebra (Swainson, 1833) throughout a year and relate the changes to environmental factors.