Assessing sampling sufficiency of network metrics using bootstrap

Casas, Grasiela; Bastazini, Vinicius A. G.; Debastiani, Vanderlei J.; Pillar, Valério D.

doi:10.1101/080655

Cited by 1 publication

(1 citation statement)

References 32 publications

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“…No-records were filled with zeroes (Bascompte et al, 2003;Falcão, Dáttilo, & Rico-Gray, 2016). Because we are faced with a simplified ecosystem, assessing the completeness of our network sampling became a critical first step required to precede analyses with a robust method to handle a small universe of interacting species (Casas, Bastazini, Debastiani, & Pillar, 2016;Chacoff et al, 2012;Hyde, Stewart, & Miller, 2014).…”

Section: Interaction Recordsmentioning

confidence: 99%

The frugivory network properties of a simplified ecosystem: Birds and plants in a Neotropical periurban park

Salazar-Rivera

Dáttilo

Castillo‐Campos

et al. 2020

Ecology and Evolution

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Frugivory networks exhibit a set of properties characterized by a number of network theory‐derived metrics. Their structures often form deterministic patterns that can be explained by the functional roles of interacting species. Although we know lots about how these networks are organized when ecosystems are in a complete, functional condition, we know much less about how incomplete and simplified networks (such as those found in urban and periurban parks) are organized, which features are maintained, which ones are not, and why. In this paper, we examine the properties of a network between frugivorous birds and plants in a small Neotropical periurban park. We found a frugivory network composed of 29 species of birds and 23 of plants. The main roles in this network are played by four species of generalist birds (three resident, one migratory: Myiozetetes similis, Turdus grayi, Chlorospingus flavopectus, and Dumetella carolinensis) and three species of plants (one exotic, two early successional: Phoenix canariensis, Phoradendron sp., and Witheringia stramoniifolia). When compared to reference data from other locations in the Neotropics, species richness is low, one important network‐level metric is maintained (modularity) whereas another one is not (nestedness). Nestedness, a metric associated with network specialists, is a feature this network lacks. Species‐level metrics such as degree, species strength, and module roles, are not maintained. Our work supports modularity as the most pervasive network‐level metric of altered habitats. From a successional point of view, our results suggest that properties revealed by species‐level indices may be developed at a later time, lagging the acquisition of structural elements.

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