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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Scarabaeinae G Halffter Biogeographia 15 1, As for abundance, the two types of forest are the most variable, and the pasture is the most stable. As hslffter have indicated, these variations could be a reflection of the flow of Scarabaeinae between the habitats of this landscape that are shaded by trees. This expresses the degree of similarity between two samples in this case, between years based on an analysis of the total balffter and of shared species Magurran Copronecrophagous beetles of the Scarabaeinae subfamily Coleoptera: The changes that occurred between samplings affected the less abundant species in the cloud forest and in halfvter pasture.
We expect as the habitat is less transformed, the assemblage is more stable over time, which could be observed through fewer changes in species richness and composition over time.
An evaluation of the influence of environment and biogeography on the structure of dung beetle Scarabaeinae assemblage along three altitudinal gradients in the Neotropical Region. Composition was only stable in the pasture, where species richness was notably lower.
Response of dung beetle diversity to human-induced changes in a tropical landscape. The diversity and abundance of epiphytes were lower than those for the sites mentioned above.
It appears that a greater number of guilds change as the environment becomes more heterogeneous and complex, as is the case for the cloud forest. The second, lower canopy is m high and is comprised of cultivated species belonging to IngaCitrusMusaPerseaand Psidium.
None of the guilds were dominant in all habitats for both T1 and T2. Email alerts New issue alert. We recognize that the differences between T1 and T2 are not the same for all habitats varying between 4 and 11 yrwhich could introduce a source of potentially confounding effect. To evaluate the completeness of our inventories, we used the nonparametric richness estimators Jack 1 and MMMean, also hwlffter the EstimateS program, to evaluate the number of species.
Gonzalo Halffter Salas
It is therefore necessary to work with different indicator groups for a given landscape. Biology International Special Gpnzalo. We analyzed changes over time in species composition and functional guild structure temporal beta diversity for natural assemblages and those modified by humans in a fragmented, tropical mountain landscape.
Quintero and Roslin cite references detailing the recovery of other groups of animals in the Manaus experiment, haflfter a whole new perspective on what can happen to species richness a few years after the tropical landscape is altered by people, as long as the matrix is “friendly.
This recovery is not immediate the short-term effect of deforestation is devastating but does occur in a few years.
Species codes capital letters are given in Table 1; n i is the number of individuals of each species recorded in each habitat. The latter authors found that the notable differences that Klein found between the intact rain forest, the fragments, and the bare areas decreased markedly over time, and there was a substantial recovery of gonaalo richness and abundance.
For the second sampling period T2every 3 mo we set up a transect similar to that of Halffer, but with 16 pitfall traps baited in the same way. The “smoothed” species accumulation curves and their confidence intervals were produced using the method proposed by Colwell et al.
gonzxlo Apartado Postal 63, XalapaVeracruz, Mexico. One aspect that stands out over time on the landscape studied is the variation in the less abundant and rare species three or fewer individuals among the sites examined.
Universitat de Barcelona – Halffter, Gonzalo
All of the eight species of not collected habitats in this study are found at altitudes that are lower or higher than that of our landscape recall that we are working on a mountainsideand these species arrived at the altitude of our study sites marginally, taking advantage of the more heliophile conditions of the oak forests and the vegetation on lava.
Dominance-diversity graphs for copronecrophagous beetles on two occasions in five habitats: This species was the most abundant at T1 in the secondary forest, yet was absent from this habitat at T2.
Many of them, at certain times of the year, are rare in the forest or in coffee plantations, whereas the reverse is true at other times of the year.
Rapid recovery of dung beetle communities following habitat fragmentation in central Amazonia. Observed and estimated richness of copronecrophagous beetle species in five habitats on two different occasions a in a mountainous tropical landscape in Mexico.
Observed species richness varied notably in the cloud forest and in the commercial shaded coffee plantation for both sampling years, but not at the other study sites Fig. Get my own profile Cited by View all All Since Citations h-index 51 33 iindex Considering all the habitats we sampled, of the total of 18 species, 14 were recorded at T1 and 14 were also recorded at T2.
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 most common species in the canopy belong to the genera IngaGrevilleaCitrusand Perseaand there are also some Platanus mexicanaPinusand Cupressus.
Entrevista Gonzalo Halffter
Dung beetles of the Haldfter forest, Uganda: There is a great diversity of tree species in the cloud forest, notably Quercus, Liquidambar, Ulmus, Clethra, Carpinusand Oreopanaxand many epiphytes and lianas.
Sign In or Create an Account. We recognize that our results are based on the study of a single indicator group on one landscape, but even so, it is possible to make a recommendation regarding conservation policies.
Dung beetle communities and seed dispersal in primary forest and disturbed land in Amazonia. There is often a mosaic of different types of vegetation that have yet to suffer any significant loss of species. Biology International Special issue 36, ,