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Transporting Biodiversity Using Transmission Power Lines as Stepping-Stones

The most common ecological response to climate change is the shifts in species distribution ranges. Nevertheless, landscape fragmentation compromises the ability of limited dispersal species to move following these climate changes. Building connected environments that enable species to track climate changes is an ultimate goal for biodiversity conservation. An experiment was conducted to determine if electric power transmission lines could be transformed in a continental network of biodiversity reserves for small animals. The study analysed if the management of the habitat located inside the base of the transmission electric towers (providing refuge and planting seedlings of native shrub) allowed to increase local richness of target species (i.e., small mammals and some invertebrates' groups). The results confirmed that by modifying the base of the electric transmission towers density and diversity of several species of invertebrates and small mammals increased as well as number of birds and bird species, increasing local biodiversity. The study suggests that modifying the base of the electric towers would potentially facilitate the connection of fragmented populations. This idea would be easily applicable in any transmission line network anywhere around the world, making it possible for the first time to build up continental scale networks of connectivity. informacion[at] Ferrer et al (2020) Transporting Biodiversity Using Transmission Power Lines as Stepping-Stones? Diversity 12(11): 439;

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Stochastic and deterministic effects on interactions between canopy and recruiting species in forest communities

Stochastic and deterministic effects on interactions between canopy and recruiting species in forest communities

Interactions between established (canopy) and recruiting individuals (recruits) are pervasive in plant communities. Studies on recruitment in forests have mainly focused on negative density-dependent conspecific interactions, while the outcomes of heterospecific canopy–recruit interactions have received much less attention and are generally assumed to be driven by stochastic processes. Herein, the relative influence of stochastic (abundance) and deterministic (species identity and phylogenetic distance) effects on the frequency of canopy–recruit interactions are explored, and the interactions in terms of their spatial consistency and effect on recruitment (depressing, neutral or enhancing) are characterized. In 12 plots (50 × 50 m) of mixed pine–oak forests in southern Spain, all saplings recruiting beneath 56 shrub and tree species, and in open areas not covered by woody plants were identified. Generalized linear mixed models were used to investigate the influence of stochastic and deterministic processes on the frequency of canopy– recruit interactions, on their spatial consistency and their effects on recruitment, and applied neutral null models to evaluate the spatial consistency in the occurrence of interactions across plots. Deterministic and stochastic interactions were equally common, emphasizing the prevalence of non-neutral effects. Among the realized interactions, 36.8% enhanced recruitment, 49.05% were neutral, and 14.1% depressed recruitment. Many potential interactions (42.08%) were not observed in any study sites, presumably due to the scarcity of the interacting species. Moreover, the probability that two species formed a canopy–recruit interaction, the frequency of their interaction and the probability that the interaction had an enhancing effect on recruitment, all increased with the phylogenetic distance between the interacting species. However, the prevalence of these effects depended on the recruitment environment (heterospecific, conspecific or open). Recruitment-enhancing interactions between heterospecifics were more consistently realized in different sites than neutral or depressing interactions. The establishment of canopy–recruit interactions (which species recruits beneath which others, and how often) is not simply determined by stochastic events. Indeed, due to their prevalence, deterministic canopy–recruit interactions may be important drivers of plant community dynamics. informacion[at] Alcántara et al 2018. Stochastic and deterministic effects on interactions between canopy and recruiting species in forest communities. Functional Ecology 32: 2264–2274.