Si la historia la escriben los que ganan, eso quiere decir que hay otra historia...

Ecología evolutivaFil: Cosacov, A. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Cosacov, A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Baranzelli, M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Baranzelli, M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Ferreiro, G. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Ferreiro, G. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Paiaro, V. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Paiaro, V. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Sérsic, A. N. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Sérsic, A. N. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.El estudio de la historia evolutiva de las plantas puede ser abordado desde múltiples perspectivas. La variación tanto genética como fenotípica en el rango geográfico de las especies es resultado de procesos evolutivos combinados y diversos producidos en el tiempo y el espacio.http://2015rabe.wix.com/rabe-2015Fil: Cosacov, A. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Cosacov, A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Baranzelli, M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Baranzelli, M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Ferreiro, G. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Ferreiro, G. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Paiaro, V. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Paiaro, V. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Sérsic, A. N. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal. Laboratorio de Ecología Evolutiva - Biología Floral; Argentina.Fil: Sérsic, A. N. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Biología (teórica, matemática, térmica, criobiología, ritmos biológicos), Biología Evolutiv

Physico-chemical and structural characterization of a series of nylons.

Nylons of the (n,3) series were characterized by differential scanning calorimetry, X-ray diffraction and IR spectroscopy. The results are compared with the behaviour of other nylons (n,m) (m 60 3). The mode of packing of the chains in the crystalline regions of the room temperature phases is also discussed

Variation of floral traits across a geographical framework of pollinator assemblages differing in functional, morphological and ethological features

The study of geographical variation of phenotypic floral traits provides a suitable background to understand the role of pollinator assemblages as drivers of floral diversity patterns. Here we present three plant-pollinator systems that differ in pollinator assemblages features. Monttea aphylla (Plantaginaceae), widespread in the Monte desert, offers simultaneously oils and nectar as reward to functionally distinct pollinators. Variation in floral rewards as a response to functionally diverse assemblages, as well as to other biotic and abiotic factors suggest that investment in the more expensive reward (oil) is promoted in communities where nectar foragers in addition to oil-collecting bees are present and stronger competition for the services of the more specialized pollinator should favor the evolution of narrower pollination niches. In communities where specialized foragers are the only available, competition for niches should be relaxed and investment in the more expensive reward would not be compensated with better services of pollinators. Calceolaria polyrhiza (Calceolariaceae) is widely distributed in the arid Patagonian steppe and in the temperate forests understory. Pollinators are either of two oil-collecting bees species which strongly differ in size. Through analyses of floral integration and covariation patterns we observed that plant-pollinator phenotypic matching across the geographical range is facilitated through variation in mechanical-fit related traits and their decoupling from variation on attraction-related traits, which are mainly affected by climatic and edaphic gradients. The decoupled geographical variation between floral modules across Patagonia is discussed as strategy that facilitates plant-pollinator phenotypic matching in this environmental heterogeneous and stressful area. Finally, phenotypic selection in the finch-pollinated Patagonian bush Anarthrophyllum desideratum (Fabaceae) showed that variation in floral traits was only partially explained by assemblage shifts; the finch species dominant in most populations seems to be locally idiosyncratic in the way it handles flowers to access nectar. As a consequence, pollen is carried on different parts of the head. Both, changes in pollinator assemblages and behavior across populations appear to complementarily account for the geographical variation in flower phenotype.Fil: Sérsic, AN. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Sérsic, AN. Consejo Nacional de Investigaciones Científicas y Técnicas. Laboratorio de biología evolutiva-Biología floral; Argentina.Fil: Sérsic, AN. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Baranzelli, M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Baranzelli, M. Consejo Nacional de Investigaciones Científicas y Técnicas. Laboratorio de biología evolutiva-Biología floral; Argentina.Fil: Baranzelli, M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Cosacov, A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Cosacov, A. Consejo Nacional de Investigaciones Científicas y Técnicas. Laboratorio de biología evolutiva-Biología floral; Argentina.Fil: Cosacov, A. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Ferreiro, G. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Ferreiro, G. Consejo Nacional de Investigaciones Científicas y Técnicas. Laboratorio de biología evolutiva-Biología floral; Argentina.Fil: Ferreiro, G. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Paiaro, V. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Paiaro, V. Consejo Nacional de Investigaciones Científicas y Técnicas. Laboratorio de biología evolutiva-Biología floral; Argentina.Fil: Paiaro, V. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Ecologí

Floral colour variation of Nicotiana glauca in native and non-native ranges: Testing the role of pollinators' perception and abiotic factors

Invasive plants displaying disparate pollination environments and abiotic conditions in native and non-native ranges provide ideal systems to test the role of different ecological factors driving flower colour variation. We quantified corolla reflectance of the ornithophilous South American Nicotiana glauca in native populations, where plants are pollinated by hummingbirds, and in populations from two invaded regions: South Africa, where plants are pollinated by sunbirds, and the Balearic island of Mallorca, where plants reproduce by selfing. Using visual modelling we examined how corolla reflectance could be perceived by floral visitors present in each region. Through Mantel tests we assessed a possible association between flower colour and different abiotic factors. Corolla reflectance variation (mainly along medium to long wavelengths, i.e. human green-yellow to red colours) was greater among studied regions than within them. Flower colour was more similar between South America and South Africa, which share birds as pollinators. Within invaded regions, corolla reflectance variation was lower in South Africa, where populations could not be distinguished from each other by sunbirds, than in Spain, where populations could be distinguished from each other by their occasional visitors. Differences in corolla colour among populations were partially associated with differences in temperature. Our findings suggest that shifts in flower colour of N. glauca across native and invaded ranges could be shaped by changes in both pollination environment and climatic factors. This is the first study on plant invasions considering visual perception of different pollinators and abiotic drivers of flower colour variation.This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica (FONCYT PICT 2015-3089, PICT 2011-0837, PICT 2012-2763, and PICT 2019-3633), the National Research Foundation of South Africa (438 75946) and the Spanish Ministry of Economy and Competitiveness (CGL2013-44386-P). We acknowledge the Universidad Nacional de Córdoba and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), both of which support the research facilities. MM, ANS, AAC and VP are staff researchers and AC, JVI and MED are fellowship holders from CONICET.Peer reviewe

Plant communities in harsh sites are less invaded: a summary of observations and proposed explanations

Plant communities in abiotically stressful, or ‘harsh’, habitats have been reported to be less invaded by non-native species than those in more moderate habitats. Here, we synthesize descriptive and experimental evidence for low levels of invasion in habitats characterized by a variety of environmental stressors: low nitrogen; low phosphorus; saline, sodic or alkaline soils; serpentine soils; low soil moisture; shallow/rocky soils; temporary inundation; high shade; high elevation; and high latitude. We then discuss major categories of hypotheses to explain this pattern: the propagule limitation mechanism suggests invasion of harsh sites is limited by relatively low arrival rates of propagules compared with more moderate habitats, while invasion resistance mechanisms suggest that harsh habitats are inherently less invasible due to stressful abiotic conditions and/or increased effects of biotic resistance from resident organisms. Both propagule limitation and invasion resistance may simultaneously contribute to low invadedness of harsh sites, but the management implications of these mechanisms differ. If propagule limitation is more important, managers should focus on reducing the likelihood of propagule introductions. If invasion resistance mechanisms are in play, managers should focus on restoring or maintaining harsh conditions at a site to reduce invasibility