The Effects of Dissolved Oxygen Concentrations of Crayfish Foraging Behavior

The Effects of Dissolved Oxygen Concentrations of Crayfish Foraging Behavior

Project Abstract: 

Humans have changed the demographics of the earth through increased CO2 which has lead to an overall increase in temperature of the earth. The increase in atmospheric temperature is expected to lead to an increase in aquatic temperature. Warmer water temperatures are predicted to pose a threat to aquatic poikilotherms. The solubility of water decreases with an increase temperature, which leads to a decrease in availability of dissolved gases. As a result of increased environmental temperatures, crayfish metabolism should increase. This increase in metabolism should increase the need for the consumption of food. The purpose of the experiment is to investigate whether reduced amounts of dissolved oxygen will alter the foraging behavior of crayfish. Crayfish are a keystone species, which means they control the demographics of their environment. The foraging behavior of two species of crayfish will be compared to determine if an increase in temperature will lead provide the invasive species Orconectes rusticus with an advantage over the native crayfish Orconectes virilis.


Crayfish foraging behavior responses to varying temperatures and dissolved oxygen concentrations in artifical streams The duration of crayfish (Orconectes rusticus and O. virilis) foraging forays were observed in artificial streams with manipulated temperature and dissolved oxygen levels. For each treatment there are 10 replications for each of the two species. For each trial the temperature, DO concentration, and trial length were recorded. Experiments were conducted at the University of Michigan Biological Station's Stream Research Facility.
Funding Agency: 
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Research Sites:

UMBS Stream Research Facility The UMBS Stream Research Facility was built and first operated in 1993 with NSF funds.