Species life-history strategies affect population responses to temperature and land-cover changes.

Human-induced environmental changes have a direct impact on species populations, with some species experiencing declines while others display population growth. Understanding why and how species populations respond differently to environmental changes is fundamental to mitigate and predict future biodiversity changes. Theoretically, species life-history strategies are key determinants shaping the response of populations to environmental impacts. Despite this, the association between species life histories and the response of populations to environmental changes has not been tested. In this study, we analysed the effects of recent land-cover and temperature changes on rates of population change of 1,072 populations recorded in the Living Planet Database. We selected populations with at least 5 yearly consecutive records (after imputation of missing population estimates) between 1992 and 2016, and for which we achieved high population imputation accuracy (in the cases where missing values had to be imputed). These populations were distributed across 553 different locations and included 461 terrestrial amniote vertebrate species (273 birds, 137 mammals, and 51 reptiles) with different life-history strategies. We showed that populations of fast-lived species inhabiting areas that have experienced recent expansion of cropland or bare soil present positive populations trends on average, whereas slow-lived species display negative population trends. Although these findings support previous hypotheses that fast-lived species are better adapted to recover their populations after an environmental perturbation, the sensitivity analysis revealed that model outcomes are strongly influenced by the addition or exclusion of populations with extreme rates of change. Therefore, the results should be interpreted with caution. With climate and land-use changes likely to increase in the future, establishing clear links between species characteristics and responses to these threats is fundamental for designing and conducting conservation actions. The results of this study can aid in evaluating population sensitivity, assessing the likely conservation status of species with poor data coverage, and predicting future scenarios of biodiversity change.

Frutas frescas y productos derivados comercializados en el Área Metropolitana de Buenos Aires, Argentina / Fresh fruits and derived products commercialized in the Metropolitan Area of Buenos Aires, Argentina

This contribution includes the registration of 70 fresh fruit species and their derivative products marketed in the Metropolitan Area of Buenos Aires, Argentina. Data on fruits and derived products were obtained from ethnobotanical fieldwork, where usual qualitative ethnobotanical methodologies were used: participant observation, free listings, open and semi-structured interviews. A bibliographic review was made on the biological activity and effects studied in order to evaluate their correspondence with the assigned local uses. The situation of invisibility/visibility of the treated species was analyzed, according to their circulation in the restricted commercial circuits (Chinese and Bolivian immigrants) and the general commercial circuit. Of the total of 70 recorded species, 62 are visible (89%) and 8 invisible (11%). These last, only found in the Barrio Chino. The registration of marketed fruits, together with their associated knowledge, represents a contribution to the study of local biocultural diversity.

Esta contribución incluye el registro de 70 especies de frutas frescas y sus productos derivados comercializadasen el Área Metropolitana de Buenos Aires, Argentina. Los datos sobre las frutas y productos derivados se obtuvieron del trabajo de campo etnobotánico, en donde se emplearon metodologías etnobotánicas cualitativas habituales: observación participante, listados libres, entrevistas abiertas y semiestructuradas. Se realizó una revisión bibliográfica sobre la actividad biológica y efectos estudiados a fin de evaluar su correspondencia con los usos locales asignados. Se analizó la situación de invisibilidad/visibilidad de las especies tratadas, según su circulación en los circuitos comerciales restringidos (inmigrantes chinos y bolivianos) y el circuito comercial general. Del total de 70 especies registradas, 62 son visibles (89%) y 8 invisibles (11%). Estas últimas se encuentran solamente en el Barrio Chino. El registro de las frutas comercializadas, junto a sus saberes asociados representa un aporte al estudio de la diversidad biocultural local.

Climate and land-use change homogenise terrestrial biodiversity, with consequences for ecosystem functioning and human well-being.

Biodiversity continues to decline under the effect of multiple human pressures. We give a brief overview of the main pressures on biodiversity, before focusing on the two that have a predominant effect: land-use and climate change. We discuss how interactions between land-use and climate change in terrestrial systems are likely to have greater impacts than expected when only considering these pressures in isolation. Understanding biodiversity changes is complicated by the fact that such changes are likely to be uneven among different geographic regions and species. We review the evidence for variation in terrestrial biodiversity changes, relating differences among species to key ecological characteristics, and explaining how disproportionate impacts on certain species are leading to a spatial homogenisation of ecological communities. Finally, we explain how the overall losses and homogenisation of biodiversity, and the larger impacts upon certain types of species, are likely to lead to strong negative consequences for the functioning of ecosystems, and consequently for human well-being.