Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/243326
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Title

Changes in the structure of seed dispersal networks when including interaction outcomes from both plant and animal perspectives

AuthorsGonzález-Castro, Aarón CSIC ORCID ; Morán-López, Teresa; Nogales, Manuel CSIC ORCID ; Traveset, Anna CSIC ORCID
KeywordsCanary Islands
Coextinction cascades
Fruit resource provisioning
Mutualistic networks
Seed dispersal effectiveness
Issue Date11-Jun-2021
PublisherWiley-VCH
Nordic Ecological Society Oikos
CitationOikos (2021)
AbstractInteraction frequency is the most common currency in quantitative ecological networks, although interaction quality can also affect benefits provided by mutualisms. Here, we evaluate if interaction quality can modify network topology, species' role and whether such changes affect community vulnerability to species loss. We use a well-examined study system (bird–lizard and fleshy-fruited plants in the ‘thermophilous' woodland of the Canary Islands) to compare network and species-level metrics from a network based on fruit consumption rates (interaction frequency, IF), against networks reflecting functional outcomes: a seed dispersal effectiveness network (SDE) quantifying recruitment, and a fruit resource provisioning network (FRP), accounting for the nutrient supply of fruits. Nestedness decreased in the FRP and the SDE networks, due to the lack of association between fruit consumption rates and 1) nutrient content and; 2) recruitment at the seed deposition sites, respectively. The FRP network showed lower niche overlap due to resource use complementarity among frugivores. Interaction evenness was lower in the SDE network, in response to a higher dominance of lizards in the recruitment of heliophilous species. Such changes, however, did not result in enhanced vulnerability against extinctions. At the plant species level, strength changed in the FRP network in frequently consumed or highly nutritious species. The number of effective partners decreased for species whose seeds were deposited in unsuitable places for recruitment. In frugivores, strength was consistent across networks (SDE vs IF), showing that consumption rates outweighed differences in dispersal quality. In the case of lizards, the increased importance of nutrient-rich species resulted in a higher number of effective partners. Our work shows that although frequency strongly impacts interaction effects, accounting for quality improves our inferences about interaction assembly and species role. Thus, future studies including interaction outcomes from both partners' perspectives will provide valuable insights about the net effects of mutualistic interactions.
Publisher version (URL)https://doi.org/10.1111/oik.08315
URIhttp://hdl.handle.net/10261/243326
DOI10.1111/oik.08315
ISSN0030-1299
E-ISSN1600-0706
Appears in Collections:(IMEDEA) Artículos
(IPNA) Artículos

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