When partitioning is not an option: Resource availability predicts intraguild interactions in two isolated Amazonian primate assemblages

Article


Cavalcante, T., Mourthé, Í., Barnett, A. and Bicca-Marques, J. 2023. When partitioning is not an option: Resource availability predicts intraguild interactions in two isolated Amazonian primate assemblages. Biotropica. 55 (4), pp. 839-848. https://doi.org/10.1111/btp.13233
TypeArticle
TitleWhen partitioning is not an option: Resource availability predicts intraguild interactions in two isolated Amazonian primate assemblages
AuthorsCavalcante, T., Mourthé, Í., Barnett, A. and Bicca-Marques, J.
Abstract

Assemblage structure and acquisition of high‐value resources will usually be affected by changes in resource availability and differential competitive abilities of assemblage members. In fragmented habitats where carrying capacity limits are exceeded due to high population densities and biomass, interspecific interactions can be expected to occur at a high frequency, potentially turning into an important cost for coexistence. We studied assemblage‐ and guild‐level patterns of interspecific interactions in two highly diverse isolated primate assemblages in southern Amazonia. Specifically, we assessed the effects of temporal variation in fruit availability on the rates of interspecific interactions between gray woolly monkeys (Lagothrix lagotricha cana), one of the largest tree‐dwelling mammals of the Amazon forests, and nine syntopic primate species. We found that fruit availability positively predicted rate of intraguild interactions in contrast to overall assemblage interaction rate. We did not find statistical evidence for the effect of fruit availability on the assemblage rates of type‐dependent (i.e., agonistic or non‐agonistic) and context‐dependent (i.e., feeding or non‐feeding) interactions. However, there was a clear trend toward increased feeding‐related and agonistic‐related interactions as fruit availability increased, with agonistic interactions mostly occurring at guild‐level. These results provide support for a significant role of fruit availability in structuring spatial–temporal intraguild interactions at our study sites. Costly interspecific interactions and spatial habitat overlap can be expected to occur at a high frequency in highly diverse assemblages living in human‐modified landscapes, which in turn, can have potentially negative impacts to the species involved.

Keywordsagonistic interactions; assemblage structure; Atelidae; habitat partitioning; interspecific interactions; resource competition
Sustainable Development Goals15 Life on land
Middlesex University ThemeSustainability
Research GroupBehavioural Biology group
LanguageEnglish
PublisherWiley
JournalBiotropica
ISSN0006-3606
Electronic1744-7429
Publication dates
Online19 May 2023
Print07 Jul 2023
Publication process dates
Submitted29 Aug 2022
Accepted01 May 2023
Deposited13 Feb 2024
Output statusPublished
Digital Object Identifier (DOI)https://doi.org/10.1111/btp.13233
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