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Large mammals generate both top-down effects and extended trophic cascades on floral-visitor assemblages

Published online by Cambridge University Press:  11 June 2019

Allison Louthan ,
Emily Valencia ,
Dino J. Martins ,
Travis Guy ,
Jacob Goheen ,
Todd Palmer  and
Daniel Doak
Allison Louthan*
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya Department of Biology, Duke University, Durham, NC 27708, USA Environmental Studies Program, University of Colorado, Boulder, CO 80309, USA
Emily Valencia
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya Environmental Studies Program, University of Colorado, Boulder, CO 80309, USA
Dino J. Martins
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya
Travis Guy
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya Department of Biology, University of Florida, Gainesville, FL 32611, USA
Jacob Goheen
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya Department of Zoology & Physiology, University of Wyoming, Laramie, WY 82071, USA
Todd Palmer
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya Department of Biology, University of Florida, Gainesville, FL 32611, USA
Daniel Doak
Affiliation:
Mpala Research Centre, P.O. Box 555, Nanyuki, Kenya Environmental Studies Program, University of Colorado, Boulder, CO 80309, USA
*
*Email: allisonmlouthan@gmail.com
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Abstract

Cascading effects of high trophic levels onto lower trophic levels have been documented in many ecosystems. Some studies also show evidence of extended trophic cascades, in which guilds dependent on lower trophic levels, but uninvolved in the trophic cascade themselves, are affected by the trophic cascade due to their dependence on lower trophic levels. Top-down effects of large mammals on plants could lead to a variety of extended trophic cascades on the many guilds dependent on plants, such as pollinators. In this study, floral-visitor and floral abundances and assemblages were quantified within a series of 1-ha manipulations of large-mammalian herbivore density in an African savanna. Top-down effects of large mammals on the composition of flowers available for floral visitors are first shown, using regressions of herbivore activity on metrics of floral and floral-visitor assemblages. An extended trophic cascade is also shown: the floral assemblage further altered the assemblage of floral visitors, according to a variety of approaches, including a structural equation modelling approach (model with an extended trophic cascade was supported over a model without, AICc weight = 0.984). Our study provides support for extended trophic cascades affecting floral visitors, suggesting that trophic cascades can have impacts throughout entire communities.

Keywords

Extended trophic cascadefloral visitorflowerslarge mammalspollinatorstrophic cascadetop-down effectstrophic ricochet
Type
Research Article
Information
Journal of Tropical Ecology , Volume 35 , Issue 4 , July 2019 , pp. 185 - 198
Copyright
© Cambridge University Press 2019 

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References

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