Clearance of laboratory-cultured bacteria by freshwater bivalves: differences between lentic and lotic unionids

1997 ◽  
Vol 75 (11) ◽  
pp. 1857-1866 ◽  
Author(s):  
Harold Silverman ◽  
Julie S. Cherry ◽  
John W. Lynn ◽  
Thomas H. Dietz ◽  
S. J. Nichols ◽  
...  

Nine species of unionids cleared laboratory-raised Escherichia coli from artificial pond water. The six unionid species collected from rivers had higher clearance rates than the three species collected from ponds, when clearance was normalized to millilitres per gram of dry tissue mass per minute. Analysis of variance indicated that all lotic unionids examined form a group with similar clearance rates. When normalized on the basis of gill surface area, rates of clearance by all of the lotic unionids become remarkably similar to one another regardless of mass, but differ significantly from those of the lentic unionids. The cirri found on the laterofrontal cells of the gills of lotic unionids tend to be complex, containing > 25 cilia per cirral plate, while the cirri of the unionid species collected from ponds have smaller cirri (< 16 cilia per cirral plate). There was a strong correlation between cirral surface area (mm2) per milligram of dry tissue and clearance rate among the unionid species studied. As a comparison, Corbicula fluminea and Dreissena polymorpha were also examined and both tended to clear bacteria more rapidly than the lotic unionids.

1995 ◽  
Vol 189 (3) ◽  
pp. 308-319 ◽  
Author(s):  
H. Silverman ◽  
E. C. Achberger ◽  
J. W. Lynn ◽  
T. H. Dietz

BioMetals ◽  
2006 ◽  
Vol 19 (4) ◽  
pp. 399-407 ◽  
Author(s):  
Véronique Marie ◽  
Patrice Gonzalez ◽  
Magalie Baudrimont ◽  
Jean-Paul Bourdineaud ◽  
Alain Boudou

1987 ◽  
Vol 65 (5) ◽  
pp. 1275-1281 ◽  
Author(s):  
George W. Benz ◽  
Kevin S. Dupre

Five blue sharks (Prionace glauca) were examined for gill-infesting copepods. Three species of siphonostomatoid copepods were collected: Gangliopus pyriformis, Phyllothyreus cornutus, and Kroyeria carchariaeglauci. The spatial distribution of K. carchariaeglauci was analyzed. The number of K. carchariaeglauci per shark was positively related to gill surface area and host size. Copepods were unevenly distributed amongst hemibranchs; flanking hemibranchs could be arranged into three statistically homogeneous groups. Female K. carchariaeglauci typically attached themselves within the middle 40% of each hemibranch; males were more evenly dispersed. Eighty percent of all K. carchariaeglauci attached themselves to secondary lamellae, the remainder were in the underlying excurrent water channels. Most K. carchariaeglauci were located between 10 and 25 mm along the lengths of gill filaments. Overall, the spatial distribution of K. carchariaeglauci was quite specific in all study planes. Explanation of this distribution is set forth in terms of natural selection pressures; however, the equally plausible explanation that the distribution pattern exhibited by these copepods is phylogenetically determined and may have little to do with contemporary selective constraints should not be ignored.


Sign in / Sign up

Export Citation Format

Share Document