Aizpurua O., Cantú-Salazar L., Martin G.S., Sardà-Palomera F., Gargallo G., Herrando S., Brotons L., Titeux N. (2017) Evaluating the reliability of species distribution models with an indirect measure of bird reproductive performance. Journal of Avian Biology. : 0-0.EnllaçDoi: 10.1111/jav.01218
Measures of fitness such as reproductive performance are considered reliable indicators of habitat quality for a species. Such measures are, however, only available in a restricted number of sites, which prevents them from being used to quantify habitat quality across landscapes or regions. Alternatively, species presence records can be used along with environmental variables to build models that predict the distribution of species across larger spatial extents. Model predictions are often used for management purposes as they are assumed to describe the quality of the habitats to support a species. Yet, given that species are often present both in optimal and suboptimal areas, the use of data collected during the breeding season to build these models may potentially result in misleading predictions of habitat quality for the reproduction of the species, with potentially significant conservation consequences. In this study we analysed the relationship between fitness parameters informing on habitat quality for reproduction and predictions of species distribution models at multiple spatial scales using two independent sets of data. For 19 passerine bird species, we compared an indirect measure of reproductive performance (ratio of juveniles-to-adults) - obtained from Constant Effort Sites (CES) mist-netting data in Catalonia - with the predictions of models based on bird presence records collected during the Catalan Breeding Bird Atlas (CBBA). A positive relationship between the predictions derived from species distribution models and the reproductive performance of the species was found for almost half of the species at one or more spatial scales. This result suggests that species distribution models may help to predict habitat quality for some species over some extents. However, caution is needed as this is not consistent for all species at all scales. Further work based on species- and scale-specific approaches is now required to understand in which situations species distribution models provide predictions that are in line with reproductive performance. © 2017 Nordic Society Oikos.
Aquilué, N., De Cáceres, M., Fortin, M.-J., Fall, A., Brotons, L. (2017) A spatial allocation procedure to model land-use/land-cover changes: Accounting for occurrence and spread processes. Ecological Modelling. 344: 73-86.EnllaçDoi: 10.1016/j.ecolmodel.2016.11.005
Batllori E., Dećaceres M., Brotons L., Ackerly D.D., Moritz M.A., Lloret F. (2017) Cumulative effects of fire and drought in Mediterranean ecosystems. Ecosphere. 8: 0-0.EnllaçDoi: 10.1002/ecs2.1906
The occurrence of multiple disturbances can jointly affect the recovery capacity of ecosystems, potentially leading to changes in vegetation dynamics or loss of resilience. The effects of interacting disturbances on ecosystems are, however, not well understood. We use a model system based on Mediterraneantype ecosystems (MTEs) to examine how the interplay between vegetation regeneration traits and compound, stochastic disturbances modulate ecosystem dynamics. We developed a state-and-transition simulation model including two tree species with contrasting regeneration strategies (seeder vs. resprouter) and a shrubland formation. We aim to assess potential compositional switches under contrasted scenarios of compound fire-drought regimes, and to characterize the cumulative effects of fire-drought (synergism vs. antagonism) relative to the effects of individual disturbance regimes. Our simulation results indicate that interaction between moderate fire and sporadic drought recurrence-as opposed to chronic dryness-can act as a strong mechanism generating highly heterogeneous landscapes in which different regeneration types coexist, as observed in MTEs. Resprouters dominated under individual, moderate disturbance regimes of fire or drought, whereas the interaction of the two disturbances promoted the longterm coexistence of both tree regeneration strategies. However, shrubland expansion and persistence at the expanse of forests was favored by increases in drought recurrence and associated fire-drought interactions, highlighting the potential for important vegetation changes in MTEs under climate change. Overall, the cumulative effects of fire and drought can lead to distinct landscape configurations under moderate disturbance regimes that are otherwise only attained under high frequency of individual disturbances. At the ecosystem level, however, we suggest that disturbance-induced vegetation dynamics can modify vegetation sensitivity and resilience to further disturbances precluding the prevalence of synergistic effects of the two disturbances. © 2017 Batllori et al.
Canelles, Q., Saura-Mas, S., Brotons, L., García, M.B., Lloret, F., Villellas, J., Morris, W.F. (2017) Environmental stress effects on reproduction and sexual dimorphism in the gynodioecious species Silene acaulis. Environmental and Experimental Botany. : 0-0.EnllaçDoi: 10.1016/j.envexpbot.2017.06.010
Cardil, A., Vepakomma, U., Brotons, L. (2017) Assessing pine processionary moth defoliation using unmanned aerial systems. Forests. 8: 0-0.EnllaçDoi: 10.3390/f8100402
Clavero, M., Ninyerola, M., Hermoso, V., Filipe, A.F., Pla, M., Villero, D., Brotons, L., Delibes, M. (2017) Historical citizen science to understand and predict climate-driven trout decline. Proceedings of the Royal Society B: Biological Sciences. 284: 0-0.EnllaçDoi: 10.1098/rspb.2016.1979
Doblas-Miranda, E., Alonso, R., Arnan, X., Bermejo, V., Brotons, L., de las Heras, J., Estiarte, M., Hódar, J.A., Llorens, P., Lloret, F., López-Serrano, F.R., Martínez-Vilalta, J., Moya, D., Peñuelas, J., Pino, J., Rodrigo, A., Roura-Pascual, N., Valladares, F., Vilà, M., Zamora, R., Retana, J. (2017) A review of the combination among global change factors in forests, shrublands and pastures of the Mediterranean Region: Beyond drought effects. Global and Planetary Change. 148: 42-54.EnllaçDoi: 10.1016/j.gloplacha.2016.11.012
Herrando, S., Brotons, L., Anton, M., Franch, M., Quesada, J., Ferrer, X. (2017) Indicators of the effects of the urban greening on birds: The case of Barcelona. Ecology and Conservation of Birds in Urban Environments. : 449-463.EnllaçDoi: 10.1007/978-3-319-43314-1_22
Kelly, L.T., Brotons, L. (2017) Using fire to promote biodiversity. Science. 355: 1264-1265.EnllaçDoi: 10.1126/science.aam7672
Kopsová-Storchová L., Storch D., Brotons L., Hořák D. (2017) Geographical variation in reproductive investment across avian assemblages in Europe: Effects of environmental drivers differ between altricial and precocial species. Journal of Avian Biology. : 0-0.EnllaçDoi: 10.1111/jav.01131
Reproductive traits provide information about the ways by which available resources are allocated during breeding. We tested for environmental drivers of large scale geographical patterns in assemblage mean clutch size, number of broods and overall reproductive investment per breeding season in European birds. We combined data about geographical distribution with published information about reproductive traits, and calculated mean trait values for avian assemblages occurring in 50 × 50 km grid cells. In total, we employed data from 499 species and 2059 assemblages. As the time available for breeding and the amount of food limit the reproductive effort, we related the geographical variation in reproductive traits to the length of breeding season, normalized difference vegetation index (NDVI) as a surrogate of resource availability, and its seasonality. Geographical patterns in traits may differ between reproductive modes, thus we performed the analyses separately for altricial Passerines (n = 203) and precocial non-passerine species (n = 164) and controlled for the effect of taxonomy. Large clutches dominated in areas with high NDVI and, in precocial birds, also in areas with high annual seasonality and a long breeding season. High number of broods and high overall reproductive investment dominated in areas with a long breeding season, and high number of broods was found also in areas with low annual seasonality, but only in precocial species. High overall reproductive investment dominated in highly productive areas and also in areas with low annual seasonality in both groups. The increase in reproductive investment is caused mostly by an increase in the number of broods related to the length of season and partly by increase in clutch size related to NDVI. We found a negative correlation between clutch size and the number of broods in Passerines, which might suggest a trade-off between these traits. Processes behind trait patterns differ between altricial and precocial species. © 2017 Nordic Society Oikos.
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