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Temperature preference of the crayfish Orconectes obscurus

L W Hall, D A Cincotta, J R Stauffer

    Archives of Environmental Contamination and Toxicology
    |January 1, 1978
    PubMed
    Summary

    The crayfish Orconectes obscurus adjusts its preferred temperature based on acclimation. This species favors warmer waters up to 26°C but seeks cooler water when acclimated to higher temperatures, with an optimal preference around 30°C.

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    Area of Science:

    • * Ecology and Environmental Science
    • * Aquatic Biology
    • * Animal Behavior

    Background:

    • * Understanding how environmental factors like temperature influence aquatic species is crucial for predicting ecological responses.
    • * Crayfish, as important components of freshwater ecosystems, exhibit behavioral thermoregulation to optimize physiological processes.
    • * The relationship between acclimation temperature and preferred temperature in crayfish species like Orconectes obscurus requires detailed investigation.

    Purpose of the Study:

    • * To investigate the influence of acclimation temperature on the acute thermal preference of the crayfish Orconectes obscurus.
    • * To determine the final temperature preferendum for Orconectes obscurus across a range of acclimation conditions.
    • * To elucidate the thermoregulatory behavior of Orconectes obscurus in response to varying thermal environments.

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    Main Methods:

    • * Crayfish (Orconectes obscurus) were acclimated to a series of constant temperatures (6°C to 33°C).
    • * Acute preferred temperatures were measured using a horizontal temperature gradient.
    • * Data analysis focused on comparing acclimation temperatures with subsequent preferred temperatures.

    Main Results:

    • * Orconectes obscurus exhibited a higher preferred temperature than its acclimation temperature for acclimation points ranging from 6°C to 26°C.
    • * When acclimated to higher temperatures (30°C and 33°C), the crayfish selected temperatures lower than their acclimation points.
    • * The final temperature preferendum for Orconectes obscurus was estimated to be approximately 30°C.

    Conclusions:

    • * Acclimation temperature significantly modulates the thermal preference of Orconectes obscurus.
    • * This species demonstrates a flexible thermoregulatory strategy, adjusting its preferred temperature to optimize its thermal environment.
    • * The findings provide critical insights into the thermal tolerance and habitat selection of crayfish, with implications for climate change adaptation studies.