Herbivory, current velocity and algal regrowth: How does periphyton grow when the grazers have gone?

T. Wellnitz, LeRoy POFF

    Research output: Contribution to journalArticle

    31 Citations (Scopus)

    Abstract

    1. An experiment conducted in streamside channels was used to document the regrowth of grazed periphyton. Our objective was to determine the relative importance of current velocity, grazing duration, and grazer type in shaping the trajectory of algal and periphytic regrowth.

    2. The grazing mayflies Baetis bicaudatus and Epeorus longimanus were used alone and in combination to create three grazing treatments at slow, medium and fast current (2–5, 15–20 and 30–40 cm s−1, respectively). Duration treatments consisted of 2, 4, 6, 8, 10 days of grazing. Chlorophyll a and ash-free dry mass (AFDM) accumulation on grazed tiles was measured (as periphytic AFDM and chlorophyll a, respectively) at 2, 4, 6, 8 and 10 days following the removal of grazers.

    3. Chlorophyll a and AFDM was best predicted by interactions between current velocity, grazing duration and regrowth time.

    4. The two grazer species did not differ in their effect on Chlorophyll a and AFDM during the period of periphytic regrowth that followed grazing.

    5. Longer grazing duration reduced periphytic biomass, but also accelerated algal regrowth, and this growth enhancement was more pronounced at slower current velocities.

    6. Data from this study suggest that herbivory can have important historical effects on periphytic accrual.
    Original languageUndefined
    Pages (from-to)2114-2123
    Number of pages10
    JournalFreshwater Biology
    Volume51
    Issue number11
    DOIs
    Publication statusPublished - 2006

    Cite this

    @article{fd8f1830df7248489e6daa43b5120d8c,
    title = "Herbivory, current velocity and algal regrowth: How does periphyton grow when the grazers have gone?",
    abstract = "1. An experiment conducted in streamside channels was used to document the regrowth of grazed periphyton. Our objective was to determine the relative importance of current velocity, grazing duration, and grazer type in shaping the trajectory of algal and periphytic regrowth.2. The grazing mayflies Baetis bicaudatus and Epeorus longimanus were used alone and in combination to create three grazing treatments at slow, medium and fast current (2–5, 15–20 and 30–40 cm s−1, respectively). Duration treatments consisted of 2, 4, 6, 8, 10 days of grazing. Chlorophyll a and ash-free dry mass (AFDM) accumulation on grazed tiles was measured (as periphytic AFDM and chlorophyll a, respectively) at 2, 4, 6, 8 and 10 days following the removal of grazers.3. Chlorophyll a and AFDM was best predicted by interactions between current velocity, grazing duration and regrowth time.4. The two grazer species did not differ in their effect on Chlorophyll a and AFDM during the period of periphytic regrowth that followed grazing.5. Longer grazing duration reduced periphytic biomass, but also accelerated algal regrowth, and this growth enhancement was more pronounced at slower current velocities.6. Data from this study suggest that herbivory can have important historical effects on periphytic accrual.",
    author = "T. Wellnitz and LeRoy POFF",
    note = "cited By 23",
    year = "2006",
    doi = "10.1111/j.1365-2427.2006.01644.x",
    language = "Undefined",
    volume = "51",
    pages = "2114--2123",
    journal = "Freshwater Biology",
    issn = "0046-5070",
    publisher = "Wiley-Blackwell",
    number = "11",

    }

    Herbivory, current velocity and algal regrowth: How does periphyton grow when the grazers have gone? / Wellnitz, T.; POFF, LeRoy.

    In: Freshwater Biology, Vol. 51, No. 11, 2006, p. 2114-2123.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Herbivory, current velocity and algal regrowth: How does periphyton grow when the grazers have gone?

    AU - Wellnitz, T.

    AU - POFF, LeRoy

    N1 - cited By 23

    PY - 2006

    Y1 - 2006

    N2 - 1. An experiment conducted in streamside channels was used to document the regrowth of grazed periphyton. Our objective was to determine the relative importance of current velocity, grazing duration, and grazer type in shaping the trajectory of algal and periphytic regrowth.2. The grazing mayflies Baetis bicaudatus and Epeorus longimanus were used alone and in combination to create three grazing treatments at slow, medium and fast current (2–5, 15–20 and 30–40 cm s−1, respectively). Duration treatments consisted of 2, 4, 6, 8, 10 days of grazing. Chlorophyll a and ash-free dry mass (AFDM) accumulation on grazed tiles was measured (as periphytic AFDM and chlorophyll a, respectively) at 2, 4, 6, 8 and 10 days following the removal of grazers.3. Chlorophyll a and AFDM was best predicted by interactions between current velocity, grazing duration and regrowth time.4. The two grazer species did not differ in their effect on Chlorophyll a and AFDM during the period of periphytic regrowth that followed grazing.5. Longer grazing duration reduced periphytic biomass, but also accelerated algal regrowth, and this growth enhancement was more pronounced at slower current velocities.6. Data from this study suggest that herbivory can have important historical effects on periphytic accrual.

    AB - 1. An experiment conducted in streamside channels was used to document the regrowth of grazed periphyton. Our objective was to determine the relative importance of current velocity, grazing duration, and grazer type in shaping the trajectory of algal and periphytic regrowth.2. The grazing mayflies Baetis bicaudatus and Epeorus longimanus were used alone and in combination to create three grazing treatments at slow, medium and fast current (2–5, 15–20 and 30–40 cm s−1, respectively). Duration treatments consisted of 2, 4, 6, 8, 10 days of grazing. Chlorophyll a and ash-free dry mass (AFDM) accumulation on grazed tiles was measured (as periphytic AFDM and chlorophyll a, respectively) at 2, 4, 6, 8 and 10 days following the removal of grazers.3. Chlorophyll a and AFDM was best predicted by interactions between current velocity, grazing duration and regrowth time.4. The two grazer species did not differ in their effect on Chlorophyll a and AFDM during the period of periphytic regrowth that followed grazing.5. Longer grazing duration reduced periphytic biomass, but also accelerated algal regrowth, and this growth enhancement was more pronounced at slower current velocities.6. Data from this study suggest that herbivory can have important historical effects on periphytic accrual.

    U2 - 10.1111/j.1365-2427.2006.01644.x

    DO - 10.1111/j.1365-2427.2006.01644.x

    M3 - Article

    VL - 51

    SP - 2114

    EP - 2123

    JO - Freshwater Biology

    JF - Freshwater Biology

    SN - 0046-5070

    IS - 11

    ER -