ORCID Profile
0000-0003-1247-365X
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Publisher: Wiley
Date: 03-04-2020
DOI: 10.1111/JVS.12866
Publisher: Springer Science and Business Media LLC
Date: 18-08-2015
Publisher: Elsevier BV
Date: 10-2020
Publisher: Public Library of Science (PLoS)
Date: 29-08-2018
Publisher: Springer Science and Business Media LLC
Date: 05-09-2017
DOI: 10.1007/S00442-017-3943-Z
Abstract: The extent of specialization/generalization continuum in fruit-frugivore interactions at the in idual level remains poorly explored. Here, we investigated the interactions between the Neotropical treelet Miconia irwinii (Melastomataceae) and its avian seed dispersers in Brazilian c o rupestre. We built an in idual-based network to derive plant degree of interaction specialization regarding disperser species. Then, we explored how intraspecific variation in interaction niche breadth relates to fruit availability on in idual plants in varying densities of fruiting conspecific neighbors, and how these factors affect the quantity of viable seeds dispersed. We predicted broader interaction niche breadths for in iduals with larger fruit crops in denser fruiting neighborhoods. The downscaled network included nine bird species and 15 plants, which varied nearly five-fold in their degree of interaction specialization. We found positive effects of crop size on visitation and fruit removal rates, but not on degree of interaction specialization. Conversely, we found that an increase in the density of conspecific fruiting neighbors both increased visitation rate and reduced plant degree of interaction specialization. We suggest that tracking fruit-rich patches by avian frugivore species is the main driver of density-dependent intraspecific variation in plants' interaction niche breadth. Our study shed some light on the overlooked fitness consequences of intraspecific variation in interaction niches by showing that in iduals along the specialization/generalization continuum may have their seed dispersed with similar effectiveness. Our study exemplifies how in idual-based networks linking plants to frugivore species that differ in their seed dispersal effectiveness can advance our understanding of intraspecific variation in the outcomes of fruit-frugivore interactions.
Publisher: FapUNIFESP (SciELO)
Date: 09-2006
DOI: 10.1590/S0101-81752006000300011
Abstract: Territory size is an important ecological attribute of populations that has been considered a factor determines population density. Antbirds is a large group of mainly insectivorous Neotropical passerines, usually well represented in bird communities from forested landscapes in Neotropical region. Territory sizes for three Antbirds, Thamnophilus caerulescens (Vieillot, 1816) (Variable Antshrike), Dysithamnus mentalis (Temmink, 1823) (Plain Antvireo) e Pyriglena leucoptera (Vieillot, 1818) (White-shouldered Fire-eye), were mapped and their area estimated by the convex polygon method in a 50 ha forest fragment, in southeastern Brazil. The three species presented small territories of similar sizes ( 2 ha) both during the non-reproductive and the reproductive seasons of 2000-2001. Territories overlapped considerably among species but not intraspecifically. Territory sizes increased with body mass of the three species studied (P. leucoptera T. caerulescens D. mentalis). We failed to find any effect on territory size for the three species associated with forest edge or distance to the dirt road.
Location: Brazil
No related grants have been discovered for Tadeu Guerra.