Share This Author
Harvestmen: the biology of Opiliones
This monograph discusses the phylogeny and biogeography of harvestmen, a small group of animals that lived in what is now Europe more than 3,000 years ago and the role they played in the evolution of humankind.
Using δ13C stable isotopes to quantify individual-level diet variation
- M. S. Araújo, D. Bolnick, G. Machado, A. Giaretta, S. F. Reis
- Environmental ScienceOecologia
- 14 March 2007
A method to convert population isotope variances into a standardized index of individual specialization (WIC/TNW) that can be compared among populations, or to gut-content variation, is developed and provides a new tool for quantifying individual-level diet variation in natural populations that combines both gut- content and isotope data.
Chemical Defense in Harvestmen (Arachnida, Opiliones): Do Benzoquinone Secretions Deter Invertebrate and Vertebrate Predators?
- G. Machado, Patricia C. Carrera, A. Pomini, A. Marsaioli
- BiologyJournal of Chemical Ecology
- 25 October 2005
The results indicate that secretions containing the 1,4-benzoquinones released by G. longipes can be an effective defense against predation, and that the effectiveness of the secretion is dependent on the predator type.
Selecting terrestrial arthropods as indicators of small-scale disturbance: A first approach in the Brazilian Atlantic Forest
The ecological tale of Gonyleptidae (Arachnida, Opiliones) evolution: phylogeny of a Neotropical lineage of armoured harvestmen using ecological, behavioural and chemical characters
This work used the information available in the literature and an intensive search for ecological, behavioural and chemical data to infer the phylogeny of the Gonyleptidae, and obtained five most parsimonious trees and the strict consensus resulted in six collapsed nodes.
Lines of defense in the harvestman Hoplobunus mexicanus (Arachnida: Opiliones): Aposematism, stridulation, thanatosis, and irritant chemicals
Sexual Selection and Static Allometry: The Importance of Function
This work proposes explanations for why sexually selected structures with different functions (courtship, threat signals, and weapons) should differ in allometry and tests predictions empirically by comparing the allometries of male structures with relatively “pure” functions, which were confirmed and helping to explain differences in previous empirical surveys.
Effects of maternal care on the lifetime reproductive success of females in a neotropical harvestman.
- B. Buzatto, Gustavo S Requena, E. G. Martins, G. Machado
- BiologyThe Journal of animal ecology
- 1 September 2007
It is suggested that maternal egg-guarding also constrains fecundity through physiological costs of egg production and increases female fitness due to the crucial importance of female presence aimed to prevent egg predation.
Intrapopulation Diet Variation in Four Frogs (Leptodactylidae) of the Brazilian Savannah
- M. S. Araújo, S. F. dos Reis, A. Giaretta, G. Machado, D. Bolnick
- Environmental ScienceCopeia
- 28 December 2007
This is the first documented case of individual-level diet variation in a diverse tropical community, indicating that this phenomenon is not restricted to competitive release-driven niche expansion in temperate, depauperate communities.
Diversity and abundance of litter frogs at altitudinal sites at Serra do Japi, southeastern Brazil
The studied sites represent harsh and early successional environments and both these factors may be acting together to produce the low observed diversity.