01758nas a2200205   4500008004100000245012500041210006900166300001000235490000700245520110300252653001501355653001601370653002801386653001501414100001701429700002001446700001601466700001701482856005301499       1999                        eng d00aThe effects of logging and grazing on the insect community associated with a semi-arid chaco forest in central Argentina0 aeffects of logging and grazing on the insect community associate  a29-420 v423 aThe ground-dwelling insect community associated with semi-arid chaco forest in the ChancanmH Natural Park and Forest Reserve (CoH rdoba, central Argentina) was studied from pitfall trap collections. The taxonomic composition and functional structure of the community present in the natural climax forest was compared with that of a degraded forest (shrubland) resulting from heavy logging and grazing. The studied communities differed significantly in taxonomic composition, sharing less than half of the insect families and less than a third of the Coleoptera species. The shift in dominant families within the Coleoptera reflected the habitat changes imposed by disturbance, mainly the scarcity of litter and presence of cattle dung in the shrubland. Such effects were also reflected in changes in the relative size of insect feeding guilds within the two habitats, scavengers being remarkably under-represented in the shrub- land. Given the key role of scavenging insects as decomposers in arid systems, this observation could have profound implications for the functioning of this habitat type.10aColeoptera10adisturbance10aground-dwelling insects10aguild size1 aMolina, S.I.1 aValladare, G.R.1 aGardner, S.1 aCabido, M.R.  uhttps://insectafgseag.myspecies.info/fr/node/39101734nas a2200217   4500008004100000245008900041210006900130260001300199300000900212490000700221520108400228653001401312653002001326653002101346653003601367653001401403653001401417100001601431700001601447856005301463       2002                        eng d00aPhenology and phylogeny of animal-dispersed plants in a Dry Chaco forest (Argentina)0 aPhenology and phylogeny of animaldispersed plants in a Dry Chaco  bElsevier  a1-160 v523 aPhenological patterns of dry tropical forests have been related to environ- mental factors, mainly rainfall and insolation, and to plant endogenous rhythms inherent to trees as large, perennial plants. Superimposed to these environ- mental (‘external hypothesis’) and intrinsic (‘endogenous hypothesis’) explana- tions, there may be phylogenetic constraints contributing to shape phenology. The phenology of tree and shrub species with fleshy fruits in a Dry Chaco forest in Argentina was studied addressing these hypotheses and following two approaches, with the species average values taken as independent data points, and removing phylogenetic effects. The hypotheses addressed are largely complementary to one another. Strong environmental restrictions conditioned general flowering patterns with species ´ endogenous characteristics acting secondarily. Phylogenetic patterns were also masked by climatic variables. When considering fruiting phenology, however, phylogeny, representing a set of species ´ shared traits, predominated over environmental restrictions.10aArgentina10adispersal guild10aDry Chaco forest10aflowering and fruiting patterns10aphenology10aphylogeny1 aMarco, D.E.1 aPáez, S.A.  uhttps://insectafgseag.myspecies.info/fr/node/38401873nas a2200145   4500008004100000245008700041210006900128300001000197490000700207520141200214100001701626700001501643700001601658856005301674       2007                        eng d00aSpatial and temporal foraging overlaps in a Chacoan ground-foraging ant assemblage0 aSpatial and temporal foraging overlaps in a Chacoan groundforagi  a29-440 v713 aIn arid habitats ant temporal foraging results from a set of trade-offs between species food discovery and food domination ability and between species thermal tolerance and behavioral dominance. We investigated how this set of trade-offs structures the spatial co-occurrence of ants during foraging, hence focusing on interspecific competition. The consequences of food type on the spatio-temporal foraging structure were also studied because food preferences were expected to optimize the restricted foraging time and space of thermophilic species. The food partitioning between 24 species attracted to protein or carbohydrate baits was studied in a dry forest of the Paraguayan Chaco. Baits were spaced at one meter intervals and inspected every 15 min over 90-min sessions conducted during mornings and afternoons. Null model analyses revealed a temporal food partitioning during afternoon sessions and a spatial partitioning, influenced by both thermal conditions and interspecific competition. Bait type did not influence the spatio-temporal foraging. Unexpectedly, evidence of interspecific competition was scarce and avoidance rather than overt conflicts appeared to be the rule of thumb. Overall, the spatio-temporal food exploitation at a small scale was affected by temperature and stochastic processes. This demonstrates that chance structures ant foraging even in constraining arid environments.1 aDelsinne, T.1 aRoisin, Y.1 aLeponce, M.  uhttps://insectafgseag.myspecies.info/fr/node/279