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Related Experiment Video

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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

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Published on: March 13, 2014

Can forest fragmentation disrupt a conditional mutualism? A case from central Amazon.

Maria Luisa S P Jorge¹, Henry F Howe

¹Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL 60607, USA. malu.jorge@vanderbilt.edu

|July 28, 2009

Summary

Forest fragmentation disrupts seed-hoarding behavior in rodents like acouchies and agoutis. Smaller fragments lead to more seed predation and less seed dispersal, altering a crucial mutualism.

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Area of Science:

Ecology
Behavioral Ecology
Conservation Biology

Background:

Scatter-hoarding is a conditional mutualism vital for seed dispersal.
Forest fragmentation poses a significant threat to ecological interactions.
The impact of fragmentation on rodent seed-hoarding behavior remains understudied.

Purpose of the Study:

To investigate how forest fragmentation affects scatter-hoarding behavior of acouchies and agoutis.
To determine if forest patch size influences seed removal, hoarding, and dispersal distances.
To assess the consequences of fragmentation on the mutualistic relationship between rodents and Astrocaryum aculeatum.

Main Methods:

Observational study at the Biological Dynamics of Forest Fragments Project in the Amazon.
Examined scatter-hoarding behavior of acouchies (Myoprocta acouchy) and agoutis (Dasyprocta leporina).
Assessed removal, hoarding, and dispersal distances of Astrocaryum aculeatum seeds across different forest fragment sizes and seasons.

Main Results:

Seed removal was higher in smaller fragments, but hoarding percentage decreased significantly.
Seed predation increased in 1-hectare fragments compared to larger areas.
Seeds were transported shorter distances in fragments than in continuous forest.

Conclusions:

Forest fragmentation, particularly in small fragments, disrupts rodent scatter-hoarding behavior.
The mutualistic relationship shifts towards seed predation in fragmented landscapes.
Conservation strategies must consider the impact of fragmentation on seed dispersal mutualisms.