GONZALO HALFFTER PDF

Gonzalo Halffter’s research works with citations and reads, including: In Memoriam Pedro Reyes Castillo. Gonzalo Halffter has expertise in. Gonzalo Halffter, Mexican entomologist. Red de Ecoetología; Instituto de Ecología A.C. – Carretera Antigua a Coatepec – XALAPA. Gonzalo Halffter . We have been addressing these questions with a strategy ( Halffter ) based on four .. , Arellano and Halffter , Arellano et al.

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As for abundance, the two types of forest are the most variable, and the pasture is the most stable. Observed and estimated richness of copronecrophagous beetle species in five habitats on two different occasions a in a mountainous tropical landscape in Mexico.

Even those cases such as biosphere reserves where nucleus areas are designated to meet the criterion of minimal disturbance, they are surrounded by a buffer zone that are to protect the nucleus. In SF, the slopes for both years were visually different, and this indicates changes in the evenness of the assemblage.

Carmen Huerta Instituto de Ecologia A. He has been the editor of three Mexican journals focusing on topics related to zoology and entomology: It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide.

Articles Cited by Co-authors. This suggests opportunistic strategies on the beetles’ part, and these, with the exception of the aforementioned forest specialists, could be moving freely through the habitats depending on food availability and habitat suitability.

Global Ecology and Biogeography — Journal of Macroecology. Vaz de Mello, F. The idea of assemblage instability is supported by the changes in the distribution of abundances and in the proportion of individuals found in the different guilds Figs.

Universitat de Barcelona – Halffter, Gonzalo

hlffter In the Los Tuxtlas region, Veracruz, Mexico, a notably fragmented tropical rain forest, many Scarabaeinae species from the forest are adapted to other habitats mainly plantations with tree shade coffee, cacao; Estrada et al. With respect to species exchange over time, the Bray-Curtis index values Fig. The pasture, comprised mainly of species belong to genera Paspalum and Panicumhad very few trees belonging to the genera Liquidambar and Quercuswhich were spared to provide shade for the cattle.

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This same guild remains practically constant in the two types of coffee plantation because of the constant contribution of excrement from both humans and their animals.

As such, those conditions are distinct to those of the landscape surveyed in this study.

The most common species in the canopy belong to the genera IngaGrevilleaCitrusand Perseaand there are also some Platanus mexicanaPinusand Cupressus. Dr Halffter has had a long and prolific scientific career, above all in the field of zoology research specifically in the field of entomology, about which he is considered a preeminent authority. Values for the Bray-Curtis index range gnozalo 0 when there were no species in common between samples and 1 when the species and their abundances are identical.

Rapid turnover and edge effects in dung beetle assemblages Scarabaeidae at a Bolivian neotropical forest-savana ecotone. Pasado, Presente y Futuro. The diversity and abundance of epiphytes were lower than those for the sites mentioned above. New citations to this author.

Co-authors View all Claudia E. Although all assemblages are dynamic, and this is associated with spatial and temporal variation in the habitat and with dispersal capacity and interactions Bengtsson et al. Copronecrophagous beetles, subfamily Scarabaeinae Insecta: Altitudinal variation of dung beetle Scarabaeidae: To what degree do Scarabaeinae composition and abundance vary over time in an intact tropical forest that has not been subjected to any anthropogenic modification?

However, the results indicating the high degree of representation of the necrophages in the disturbed habitats supports the idea that they are a useful tool for evaluating the “health status” of sites. Avaliacaodoimpactodafragmentacaoda floresta sobre Scarabaeinae Coleoptera: There is a great diversity of tree species in the cloud forest, notably Quercus, Liquidambar, Ulmus, Clethra, Carpinusand Oreopanaxand many epiphytes and lianas.

Finally, we used the G test for 2 by 6 contingency tables having applied the Yates correction for the traditional shaded coffee plantations, 2 by 5 contingency tables for TMCF, secondary forest, and the commercial shaded coffee plantation given that one guild was not detected in each habitatand 2 by 3 contingency tables for the pasture three guilds were not recorded in this habitat.

A study with exactly the same time lapses between samplings in all habitats considering a set of habitats as a gradient of anthropogenic transformation or considering habitat type as a factor, including replications would be a better approach to avoid possible confusion.

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For each site and both Fonzalo and T2, we identified the specimens that were caught to the species level and counted all specimens captured. In Mexico, as in other places in Mesoamerica, tropical montane cloud forests TMCFs is found in bands at intermediate altitudes commonly between and 1, m asl in mountainous regions. In all cases, they were species low in abundance three or fewer individuals.

Effects of clearing in a tropical rain forest on the composition of the coproph-agous scarab beetle fauna Coleoptera.

Gonzalo Halffter Salas

Of these species, two, Onthophagus schaefferi and Dichotomius amplicollishave also been collected but not in our halfrter in commercial shaded coffee plantations. In TMCFs, we recorded a greater abundance of beetles for T2 than for T1, but we also recorded lower richness, and rare species one individual were absent.

Spatial distribution of three groups of Coleoptera along and al-titudinal transect in the Mexican Transition Zone and its biogeographical implications. To detect those guilds gozalo which frequency of appearance differed by sampling year, we subdivided the contingency tables and reanalyzed the data with the same test Zar The frequency distribution in the two coffee plantations indicates slightly greater stability.

Villa de Leyva, Colombia.

Gonzalo Halffter

Four species were only recorded in one of the sampling years Table 1. Habitat associations and community analysis of south Texas dung beetles Coleoptera: The landscape is uneven, and the geology and soils are mainly volcanic. For these situations, Halffter has proposed “archipelago reserves” that within a regional scheme include existing protected areas but also include the habitats that are rich in diversity and are found between the protected areas matrix habitats with intermediate transformationplaying the role of corridors or, as we have seen in this study, a role that is complementary to the fragments of original vegetation.

For commercial re-use, please contact journals. The transformation of the cloud forest into agricultural fields was greatest from the end of the 19th century to the midth century with the peak in coffee production Challenger The predictions are catastrophic.