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3 results for “generalist herbivory”
Data on specialist and generalist herbivory, environmental variation, and phytochemical similarity from the Atlantic Rainforest of Brazil: 2013-2014
What: These are data on specialist and generalist herbivory from naturally occurring Piper plants as well as environmental data collected in 10 m diameter plots across sites in the Atlantic Rainforest of Brazil. Data also include chemical similarity calculated as the Morisita similarity index for species in a given plot and chemical modules that demonstrate classes of compounds that group together and influence herbivory. Why: Data were collected to understand factors that influence herbivory and tropical forest richness with a particular focus on secondary chemistry metabolomics. Where: Field sites include São Bento de Sapucaí (-22.8758, -45.8581), Parque Nacional de Itatiaia (-22.3698, -44.6285), Parque Estadual de Intervales (-24.3088, -48.2736), and Parque Estadual de Serra do Mar - Núcleo Pincinguaba (-23.6200, -46.7222). When: Data were collected in the field from Dec 2013 – May 2014. How: Field data were collected in 10 m diameter plots centered on randomly located Piper plants. Chemical data come from 1H-NMR metabolomics.
Strategies in herbivory by mammals revisited: The role of liver metabolism in a juniper specialist ( Neotoma stephensi ) and a generalist ( Neotoma albigula )
Although herbivory is widespread among mammals, few species have adopted a strategy of dietary specialization. Feeding on a single plant species often exposes herbivores to high doses of similar plant secondary metabolites (PSMs), which may exceed the animal's detoxification capacities. Therefore, theory predicts that specialists will have unique detoxification mechanisms to process high levels of dietary toxins. To evaluate this hypothesis, we compared liver metabolism of a juniper specialist, Neotoma stephensi (diet >85% juniper), to that of a sympatric generalist, N. albigula (diet ≤30% juniper). Specifically, we quantified the content of a key detoxification enzyme, cytochrome P450 2B (CYP2B) in liver microsomes, as well as the microsomal turnover of α-pinene, the most abundant terpene in the juniper species consumed by the specialist woodrat. In both Neotoma species, a 30% juniper diet increased CYP2B content (2-3x) and α-pinene turnover rates (4-fold). In N. stephensi, higher levels of dietary juniper (60% and 100%) further induced CYP2B content and increased turnover rates of α-pinene. Although no species-specific differences in α-pinene turnover rates were observed at 30% dietary juniper, CYP2B content was 1.7x higher in N. stephensi than in N. albigula (p<0.01). In N. stephensi, the rates of α-pinene turnover increased with dietary juniper and were positively correlated with CYP2B content. The ability of N. stephensi to elevate CYP2B content and rate of α-pinene turnover with increasing levels of juniper in the diet (from 30-100%) may facilitate juniper specialization in this species.
Strategies in herbivory by mammals revisited: The role of liver metabolism in a juniper specialist ( Neotoma stephensi ) and a generalist ( Neotoma albigula )
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