Please use this identifier to cite or link to this item:
Title: Herbivory, growth rates, and habitat specialization in tropical tree lineages: Implications for Amazonian beta-diversity
Authors: Lamarre, Greg P.A.
Baraloto, Christopher
Fortunel, Claire
Dávila, Nállarett
Mesones, Italo
Rios, Julio Grandez
Ríos, Marcos
Valderrama, Elvis
Pilco, Magno Vásquez
Van Antwerp Fine, Paul
Keywords: Density Dependence
Floodplain Forest
Growth Rate
Habitat Type
Natural Enemy
Plant Defense
Relative Abundance
Resource Allocation
Resource Availability
Soil Fertility
Species Diversity
Tropical Forest
French Guiana
Micropholis (angiosperm)
Issue Date: 2012
metadata.dc.publisher.journal: Ecology
metadata.dc.relation.ispartof: Volume 93, Número 8 SPEC. ISSUE, Pags. S195-S210
Abstract: Tropical plant diversity is extraordinarily high at both local and regional scales. Many studies have demonstrated that natural enemies maintain local diversity via negative density dependence, but we know little about how natural enemies influence beta-diversity across habitats and/or regions. One way herbivores could influence plant beta-diversity is by driving allocation trade-offs that promote habitat specialization across resource gradients. We therefore predicted that increasing resource availability should be accompanied by increasing herbivory rates and decreasing plant allocation to defense. Second, relative abundances within plant lineages are predicted to reflect patterns of habitat specialization and allocation tradeoffs. A phylogenetic context is vital not only to compare homologous plant traits (including defense strategies) across habitat types, but also to connect evolutionary trade-offs to patterns of species diversification in each phylogenetic lineage. We tested these predictions for trees in white-sand, clay terra firme, and seasonally flooded forests in Peru and French Guiana that represent the range of soil fertility, forest structure, and floristic compositions found throughout the Amazon region. We established 74 0.5-ha plots in these habitats and sampled all trees. Within 12 representative plots we marked newly expanding leaves of 394 saplings representing 68 species, including the most abundant species in each plot in addition to species from five focal lineages: Swartzia and Inga (Fabaceae), Protieae (Burseracaeae), Bombacoideae (Malvaceae), and Micropholis (Sapotaceae). We measured total leaf production rates for each sapling and calculated relative herbivory impact as the ratio between herbivory rate and leaf production rate. Herbivory rates averaged 2.1% per month, did not correlate with leaf production rate, and were similar across habitats. Relative herbivore impacts exceeded leaf production rates for most species. Leaf production rate averaged 2.8%, was significantly higher in seasonally flooded forests than the other two habitats, and exhibited significant correlations with specific leaf area. Species with high herbivory rates exhibited significantly lower relative abundances in terra firme forests. Overall, focal species within lineages present contrasting patterns regarding their herbivory rates and leaf production rate within habitats. These results highlight why a lineage-based approach is necessary when attempting to connect hypotheses regarding evolutionary trade-offs to community assembly patterns. © 2012 by the Ecological Society of America.
Appears in Collections:Artigos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.