ADVERSE EFFECTS OF ECOLOGICALLY RELEVANT DIETARY MERCURY EXPOSURE IN SOUTHERN LEOPARD FROG (RANA SPHENOCEPHALA) LARVAE

2004 ◽  
Vol 23 (12) ◽  
pp. 2964 ◽  
Author(s):  
Jason M. Unrine ◽  
Charles H. Jagoe ◽  
William A. Hopkins ◽  
Heather A. Brant
Keyword(s):  
Adverse Effects ◽  
Mercury Exposure ◽  
Leopard Frog ◽  
Rana Sphenocephala

Development and characterization of 18 microsatellite loci for the Southern Leopard Frog, Rana sphenocephala

2010 ◽  
Vol 3 (2) ◽  
pp. 267-269 ◽  
Author(s):  
Anna M. McKee ◽  
Stacey L. Lance ◽  
Kenneth L. Jones ◽  
Cris Hagen ◽  
Travis C. Glenn
Keyword(s):  
Microsatellite Loci ◽  
Leopard Frog ◽  
Rana Sphenocephala

Behaviour and growth of southern leopard frog (Rana sphenocephala) tadpoles: effects of food and predation risk

2001 ◽  
Vol 79 (5) ◽  
pp. 809-814 ◽  
Author(s):  
K J Babbitt
Keyword(s):  
Food Resource ◽  
Leopard Frog ◽  
Rana Sphenocephala ◽  
Food Treatment ◽  
Leopard Frogs ◽  
Resource Level ◽  
Size At Metamorphosis ◽  
Interesting Possibility ◽  
Limited Food ◽  
Level I

I examined the effects of a nonlethal predator, larvae of the odonate Anax junius, and food-resource level on behaviour and growth of larval southern leopard frogs (Rana sphenocephala) to test whether the strength of effects of a nonlethal predator was influenced by background resource level. I crossed two levels of food resources, growth-limiting and non-growth-limiting, with the presence or absence of A. junius. Tadpoles responded to predators by altering spatial distribution and activity. When predators were present, tadpoles on both food treatments had similar low levels of activity, but tadpoles on the nonlimiting food treatment showed a much larger reduction in activity than tadpoles on the growth-limiting treatment. Tadpoles on both food treatments delayed metamorphosis when exposed to predators. Growth and size at metamorphosis were affected significantly by food treatment but not by predator treatment. However, the direction of response to predators differed. Tadpoles on the growth-limiting treatment were larger at metamorphosis and grew faster when exposed to predators; the opposite was true for tadpoles on the non-growth-limited food treatment. This raises the interesting possibility that for some species experiencing low resource availability, predators may induce a behaviourally mediated positive effect on growth.

scholarly journals Dietary Mercury Exposure Resulted in Behavioral Differences in Mice Contaminated with Fish-Associated Methylmercury Compared to Methylmercury Chloride Added to Diet

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Jean-Paul Bourdineaud ◽  
Masumi Marumoto ◽  
Akira Yasutake ◽  
Masatake Fujimura
Keyword(s):  
Fatty Acids ◽  
Adverse Effects ◽  
Polyunsaturated Fatty Acids ◽  
Open Field ◽  
Fish Consumption ◽  
Mercury Exposure ◽  
Behavioral Differences ◽  
Metabolic Turnover ◽  
Methylmercury Chloride ◽  
Toxicological Studies

Methylmercury (MeHg) is a potent neurotoxin, and humans are mainly exposed to this pollutant through fish consumption. However, in classical toxicological studies, pure methylmercury chloride (MeHgCl) is injected, given to drink or incorporated within feed assuming that its effects are identical to those of MeHg naturally associated to fish. In the present study, we wanted to address the question whether a diet containing MeHg associated to fish could result in observable adverse effects in mice as compared to a diet containing the same concentration of MeHg added pure to the diet and whether beneficial nutriments from fish were able to counterbalance the deleterious effects of fish-associated mercury, if any. After two months of feeding, the fish-containing diet resulted in significant observable effects as compared to the control and MeHg-containing diets, encompassing altered behavioral performances as monitored in a Y-shaped maze and an open field, and an increased dopamine metabolic turnover in hippocampus, despite the fact that the fish-containing diet was enriched in polyunsaturated fatty acids and selenium compared to the fish-devoid diets.

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