1. Understanding the mechanisms underlying community stability has become an urgent need to protect ecosystems from global change and resulting biodiversity loss. While community stability can be influenced by species richness, synchrony in annual fluctuations of species, species stability and functional traits, the relative contributions of these drivers to stability are still unclear. In seminatural grasslands, land-use changes such as fertilization might affect stability by decreasing richness and influencing year-to-year fluctuations. In addition, they can promote long-term directional trends, shifting community composition and influencing grassland maintenance. Thus, it is important to consider how species and community stability vary year-to-year but also in the long term.2. Using a 14-year vegetation time series of a species-rich semi-natural Mediterranean grassland, we studied the relative importance of richness, synchrony, species stability and functional traits on community stability. To assess land-use change effects on stability, we applied a fertilization treatment. To distinguish stability patterns produced by year-to-year fluctuations from those caused by long-term trends, we compared the results obtained using a detrending approach from those without detrending.3. Independently of the treatment and approach applied, the most stable communities were those composed of asynchronous species with low specific leaf area.Fertilization decreased year-to-year and long-term community stability by increasing community-weighted mean of specific leaf area, decreasing species stability or also reducing richness in the case of year-to-year stability. Additionally, traits such as seed mass had an indirect effect on stability through synchrony.Long-term trends appeared in control and fertilized plots (due to fertilization), decreasing community and species stability and leading to differences in the relationships found between community stability and some of its drivers. This reflects the importance of accounting for the effect of temporal trends on community and species stability using both a long-term and a year-to-year approach.
The understory of temperate forests harbour most of the plant species diversity present in these ecosystems. The maintenance of this diversity is strongly dependent on canopy gap formation, a disturbance naturally happening in non-managed forests, which promotes spatiotemporal heterogeneity in understory conditions. This, in turn, favours regeneration dynamics, functioning and structural complexity by allowing changes in light, moisture and nutrient availability. Our aim is to study how gap dynamics influence the stability of understory plant communities over a decade, particularly in their structure and function. The study was carried out in 102 permanent plots (sampled in 2006 and revisited in 2016) distributed throughout a 132 ha basin located in a non-managed temperate beech-oak forest (Bertiz Natural Park, Spain). We related changes in the taxonomical and functional composition and diversity of the understory vegetation to changes in canopy coverage. We found that gap dynamics influenced the species composition and richness of the understory through changes in light availability and leaf litter cover. Species with different strategies related to shade tolerance and dispersion established in the understory following the temporal evolution of gaps. However, changes in understory species composition in response to canopy dynamics occur at a slow speed in old-growth temperate forests, needing more than a decade to really be significant. The presence of gaps persisting more than ten years is essential for maintaining the heterogeneity and stability of understory vegetation in old-growth temperate forests.
In business, the “long-tail economy” refers to a market strategy where the gravity center shifts from a few high-demand products to many, varied products focused on small niches. Commercialization of individually low-demand products can be profitable as long as their production cost is low and, all taken together, they aggregate into a big chunk of the market. Similarly, in the “business” of biodiversity data acquisition, we can find several mainstream products that produce zillions of bits of information every year and account for most of the budget allocated to increase our primary data-based knowledge about Earth’s biological diversity. These products play a crucial role in biodiversity research. However, along with these large global projects, there is a constellation of small-scale institutions that work locally, but whose contribution to our understanding of natural processes should not be dismissed. These information datasets can be collectively referred to as the “long-tail biodiversity data”. Here we present the case of the Museum of Sciences University of Navarra, which harbors the research activity of the Museum of Zoology (MZNA) and herbarium (PAMP) of the University of Navarra in Spain. For the last 40 years, its members have been involved in hundreds of research projects, from local to international level—but quantitatively, the vast majority of its biodiversity records come from Navarra, a smallish (10,000 sq. km) administrative region in the north of Spain. Despite its modest area, the available information about the region in the Museum database approaches one million records of thousands of species, including dozens of type series. Fifteen years ago, a series of national research grants enabled boosting digitization and public access to the database records through the Global Biodiversity Information Facility (GBIF). Although those grants were never renewed, the Museum continued its digitizing and standardizing program on vouchered collections, as well as sampling additional raw biodiversity data through long term ecological sites using the Museum’s resources, which annually provide thousands of new records at the local level. Currently, the Museum has already published through GBIF’s IPT (Integrated Publishing Toolkit) 30 datasets, containing more than half-million records of about 5700 taxa. Its records have contributed to more than 60 peer-reviewed publications over the last five years. Institutions that basically harvest biodiversity data at a local scale usually show a high degree of specialization, gathering researchers with strong (albeit often narrow) expertise in the taxonomy and ecology of nearby ecosystems. They are thus an extremely valuable tool when dealing with processes resulting in diversity changes that can be identified rather precisely, especially when their work can be traced back many decades. Making all this fine-scale information accessible and actionable requires, in most of the cases, a rather modest investment in staff training on data management (e.g., standards, database interoperability) or museum curation procedures, and on informatics infrastructure. As in the case of business, it is not a matter of choosing between producing blockbusters or independent cinema--but of leveraging available resources and maximizing output.
The authors wish to make the following corrections to their paper [...]
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