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3 novembre 2016

Lizards paid a greater opportunity cost to thermoregulate in a less heterogeneous environment [Functional Ecology]

Keywords : cost-benefit model, climate change, ectotherm, microclimate, energy budget, survival, performance, null model

1.The theory of thermoregulation has developed slowly, hampering efforts to predict how individuals can buffer climate change through behaviour. Mixed results of field and laboratory experiments underscore the need to test hypotheses about thermoregulation explicitly, while measuring costs and benefits in different thermal landscapes.
2.We simulated body temperature and energy expenditure of a virtual lizard that either thermoregulates optimally or thermoconforms in a landscape of either low or high quality (one or four basking sites, respectively). We then compare the predicted values in each landscape with the observed values for real lizards in experimental arenas.(...)

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2 novembre 2016

Global meta-analysis of native and nonindigenous trophic traits in aquatic ecosystems [Global Change Biology]

Keywords : biological invasions, comparative studies, effect size, freshwater, invasive species, marine, range expansion, range shift

Ecologists have recently devoted their attention to the study of species traits and their role in the establishment and spread of nonindigenous species (NIS). However, research efforts have mostly focused on studies of terrestrial taxa, with lesser attention being dedicated to aquatic species. Aquatic habitats comprise of interconnected waterways, as well as exclusive introduction vectors that allow unparalleled artificial transport of species and their propagules. Consequently, species traits that commonly facilitate biological invasions in terrestrial systems may not be as represented in aquatic environments. We provide a global meta-analysis of studies conducted in both marine and freshwater habitats.(...)

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2 novembre 2016

Demographic drivers of decline and recovery in an Afro-Palaearctic migratory bird population [Royal Society Open Science]

Keywords : population dynamics, integrated population models, carry-over effects, migration, demography

Across Europe, rapid population declines are ongoing in many Afro-Palaearctic migratory bird species, but the development of appropriate conservation actions across such large migratory ranges is severely constrained by lack of understanding of the demographic drivers of these declines. By constructing regional integrated population models (IPMs) for one of the suite of migratory species that is declining in the southeast of Britain but increasing in the northwest, we show that, while annual population growth rates in both regions vary with adult survival, the divergent regional trajectories are primarily a consequence of differences in productivity. (...)

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1er novembre 2016

Unearthing the roots of ectomycorrhizal symbioses [Nature Reviews Microbiology / Review]

Subject terms : forest ecology, fungal evolution, fungal genomics, fungal host response, symbiosis

During the diversification of Fungi and the rise of conifer-dominated and angiosperm- dominated forests, mutualistic symbioses developed between certain trees and ectomycorrhizal fungi that enabled these trees to colonize boreal and temperate regions. The evolutionary success of these symbioses is evident from phylogenomic analyses that suggest that ectomycorrhizal fungi have arisen in approximately 60 independent saprotrophic lineages, which has led to the wide range of ectomycorrhizal associations that exist today. In this Review, we discuss recent genomic studies that have revealed the adaptations that seem to be fundamental to the convergent evolution of ectomycorrhizal fungi, including the loss of some metabolic functions and the acquisition of effectors that facilitate mutualistic interactions with host plants. Finally, we consider how these insights can be integrated into a model of the development of ectomycorrhizal symbioses.

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1er novembre 2016

Amplified plant turnover in response to climate change forecast by Late Quaternary records [Nature Climate Change / Letter]

Subject terms : biogeography, climate-change ecology

Conservation decisions are informed by twenty-first-century climate impact projections that typically predict high extinction risk. Conversely, the palaeorecord shows strong sensitivity of species abundances and distributions to past climate changes, but few clear instances of extinctions attributable to rising temperatures. However, few studies have incorporated palaeoecological data into projections of future distributions. Here we project changes in abundance and conservation status under a climate warming scenario for 187 European and North American plant taxa using niche-based models calibrated against taxa–climate relationships for the past 21,000 years. (...)

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