Current velocity and habitat patchiness shape stream herbivore movement

A.L. Hoffman, J.D. Olden, J.B. Monroe, LeRoy POFF, T. Wellnitz, J.A. Wiens

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    Animal movements are influenced by the structure and arrangement of patches in a landscape. Most movement studies occur in terrestrial landscapes, though aquatic landscapes are equally heterogeneous and feature patches that differ in resistance to animal movements. Furthermore, the variable and highly directional flow of water over streambed landscapes is a unique environmental element, yet its constraint on animal movement is poorly understood. This study examines how habitat availability in a streambed landscape interacts with current velocity to affect movement patterns of two benthic grazers: glossosomatid caddisfly larvae (Agapetus boulderensis) and pulmonate snails (Physa sp.). Using experimental streambed landscapes, we found that Agapetus traveled farther as availability of smooth habitat (composed of low diatom turfs) increased compared to tall, structured filamentous stands, but only did so in slow current velocities. Swifter flows caused restricted movement of Agapetus and more upstream-oriented paths, but only in smooth landscapes where the potential for flow refugia from filamentous stands was minimal. Similarly, increasing proportions of smooth habitat facilitated greater net displacement of Physa using more upstream-oriented paths. Higher current velocities caused Physa to move faster, a pattern demonstrated only in smooth landscapes.

    Our results illustrate a strong interaction between benthic habitat structure and current velocity in shaping patterns of grazer movements in a streambed landscape. Our study also suggests that the flow of water be considered not only a strong environmental gradient in streams, but also an interactive landscape feature that can combine with streambed structure to determine the permeability of patches to the movement of benthic organisms. Landscape ecology has mainly focused on terrestrial environments, and this study offers insight into some of the unique processes that may shape animal movement in aquatic environments.
    Original languageUndefined
    Pages (from-to)358-368
    Number of pages11
    JournalOIKOS
    Volume115
    Issue number2
    DOIs
    Publication statusPublished - 2006

    Cite this

    Hoffman, A. L., Olden, J. D., Monroe, J. B., POFF, L., Wellnitz, T., & Wiens, J. A. (2006). Current velocity and habitat patchiness shape stream herbivore movement. OIKOS, 115(2), 358-368. https://doi.org/10.1111/j.2006.0030-1299.14675.x
    Hoffman, A.L. ; Olden, J.D. ; Monroe, J.B. ; POFF, LeRoy ; Wellnitz, T. ; Wiens, J.A. / Current velocity and habitat patchiness shape stream herbivore movement. In: OIKOS. 2006 ; Vol. 115, No. 2. pp. 358-368.
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    Hoffman, AL, Olden, JD, Monroe, JB, POFF, L, Wellnitz, T & Wiens, JA 2006, 'Current velocity and habitat patchiness shape stream herbivore movement', OIKOS, vol. 115, no. 2, pp. 358-368. https://doi.org/10.1111/j.2006.0030-1299.14675.x

    Current velocity and habitat patchiness shape stream herbivore movement. / Hoffman, A.L.; Olden, J.D.; Monroe, J.B.; POFF, LeRoy; Wellnitz, T.; Wiens, J.A.

    In: OIKOS, Vol. 115, No. 2, 2006, p. 358-368.

    Research output: Contribution to journalArticle

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    Hoffman AL, Olden JD, Monroe JB, POFF L, Wellnitz T, Wiens JA. Current velocity and habitat patchiness shape stream herbivore movement. OIKOS. 2006;115(2):358-368. https://doi.org/10.1111/j.2006.0030-1299.14675.x