02294nas a2200265   4500008004100000245011100041210006900152260001200221300001200233490000700245520153200252653002601784653001901810653001101829653001401840653001701854653001201871653001401883653002401897653001701921653001701938100001701955700002101972856003501993       1999                        eng d00aBetween-group differences in the Iberian dung beetle species-area relationship (Coleoptera : Scarabaeidae)0 aBetweengroup differences in the Iberian dung beetle speciesarea   cNov-Dec  a587-5970 v203 aBetween-group alpha- and beta-diversity differences were derived from species-area relationships fitted to field data. The accuracy of spatial richness variation predictions based on area size was also checked. The log-log model (log S = c + z log A) was found to be the best-fit linear model, with slopes (z) ranging from 0.089 to 0.142. Between-group comparisons of z (slope) and q (intercept) parameters, using the S = q + cA(Z) curvilinear regression model, corroborated early results, indicating a lower beta-diversity (slope) for Scarabaeinae than for Geotrupinae and Aphodiinae. The latter group, probably more sensitive to environmental heterogeneity, should contribute more to species richness in large areas. alpha-Diversity is greater for Aphodiinae, more relevant to local diversity (1 km(2)), than for Scarabaeinae and considerably greater for these two groups than for Geotrupinae. As earlier results show that the richness of a single dung pat is rather more a function of the Scarabaeinae species pool, richness on dung pat scales is probably due more to the between-dropping mobile Scarabaeinae, while Aphodiinae contribute mainly to local and regional pool richness. Nearly 88 % of the total richness variance is explained by area size. This percentage decreases to 37 % when the spatial structure of area size and species number are extracted. The corresponding figures for Scarabaeinae, Aphodiinae and Geotrupinae are 44, 22 and 31 %, respectively. (C) 1999 Editions scientifiques et medicales Elsevier SAS.10aAPHODIUS SCARABAEIDAE10abeta-diversity10aCURVES10adiversity10aDung beetles10aIberian10aPeninsula10arichness comparison10aScarabaeidae10aspecies-area1 aLobo, J., M.1 aMartin-Piera, F.  u<Go to ISI>://000084618100002 02308nas a2200265   4500008004100000245004800041210004800089260000800137300001200145490000700157520157300164653002601737653001401763653001701777653003101794653002801825653002001853653002901873653001401902653001501916653003701931653002501968100001501993856003402008       2000                        eng d00aDung beetle movements at two spatial scales0 aDung beetle movements at two spatial scales  cNov  a323-3350 v913 aTo understand the dynamics of spatially structured populations, we need to know the level of movements at different spatial scales. This paper reports on Aphodius dung beetle movements at two scales: movements between dung pats within pastures, and movements between pastures. First, I test an assumption common to many recent models of spatially structured populations - that the probability of an individual moving between habitat patches decreases exponentially with distance. For dung beetles, I find sufficient evidence to reject this assumption. The distribution of dispersal distances was clearly leptokurtic, with more individuals moving short and long distances than expected on the basis of an exponential function. In contrast, the data were well described by a power function. I conclude that dung beetle movements include an element of non-randomness not captured by the simplistic exponential model. The power function offers a promising alternative, but the actual mechanisms behind the pattern need to be clarified. Second, I compare several species of Aphodius to each other. Although these species occur in the same network of habitat patches, their movement patterns are different enough to result in a mixture of different spatial population structures. Movements between pastures were more frequent the larger the species, the more specific its occurrence in relation to pat age, and the more specialized it is on cow dung and open pasture habitats. Within pastures, all species form "patchy" populations, with much movement among individual pats.10aAPHODIUS SCARABAEIDAE10abutterfly10acolonization10aeuphydryas-editha-bayensis10along-distance dispersal10amelitaea-cinxia10ametapopulation structure10amigration10apatch size10aproclossiana-eunomia lepidoptera10aresource utilization1 aRoslin, T.  u<Go to ISI>://00016601780001302220nas a2200337   4500008004100000245007200041210006900113260000800182300001000190490000800200520133000208653001301538653002601551653001501577653001501592653001401607653001401621653001301635653001901648653001701667653001901684653001101703653001501714653002501729653001501754653003301769653001401802100001501816700001701831856003401848       2001                        eng d00aDistribution and abundance of dung beetles in fragmented landscapes0 aDistribution and abundance of dung beetles in fragmented landsca  cMar  a69-770 v1273 aRelated species utilising similar resources are often assumed to show similar spatial population structures and dynamics. This paper reports substantial ecological variation within a set of Aphodius dung beetles occurring in the same patchily distributed resource, livestock dung in pastures. We show how variation in habitat and resource selectivity, in the rate of movements between pastures, and in the distribution of local population sizes all contribute to interspecific differences in spatial population structures. Local dung beetle assemblages are compared between two landscapes with different densities of pastures. In one of the landscapes, we contrast the abundances and regional distributions of Aphodius before and after 15 years of rapid habitat loss. Different species show very dissimilar responses to changes in the structure of the landscape. Our results suggest that generalist Aphodius species, and specialist species with high dispersal powers, occur as large "patchy" populations in the landscape. In contrast? a strict pasture specialist species with limited dispersal powers (A. pusillus) forms classical metapopulations. At the community level, interspecific differences in spatial population structures make the local community composition a function of the structure of the surrounding landscape.10aaphodius10aAPHODIUS SCARABAEIDAE10aassemblage10aCOLEOPTERA10acommunity10adiversity10adynamics10aeurope mammals10ahabitat loss10ametapopulation10apatchy10apopulation10aresource utilization10aserpentine10aspatial population structure10astability1 aRoslin, T.1 aKoivunen, A.  u<Go to ISI>://000167629200008