Project Summary: Understanding factors that influence ecological stability is a key question in ecology. Population ecology has highlighted that synchrony within a species over space is an important indicator of species stability. Community ecology, in contrast, has highlighted that asynchrony between species within space may enhance the stability of aggregate properties (such as total productivity)…. Read more »
Project summary: Although hundreds of short-term local experiments indicate that random changes in biodiversity can cause substantial changes in primary productivity, considerable debate remains regarding whether these influences of biodiversity are weaker or stronger at larger spatial and temporal scales in natural ecosystems. Given this knowledge gap, current models often implicitly assume no influence of biodiversity… Read more »
Soil organic matter is a massive storehouse for carbon, as well as a key regulator of nutrient cycling and soil quality in terrestrial ecosystems, yet ecology lacks a full understanding of the controls on stabilization and breakdown of soil organic matter. Two sets of competing theories underlie models that adequately predict site-specific dynamics, but result… Read more »
Project summary: Dissolved organic matter (DOM) provides a significant source of energy and nutrients to ecosystems and its biogeochemical cycling is inextricably linked to dissolved inorganic nitrogen (DIN). In stream ecosystems in particular, there is considerable spatial and temporal variation in the relationships between the different fractions of DOM (dissolved organic carbon and nitrogen) and DIN…. Read more »
Metacommunity ecology considers both the local- and regional-scale factors that influence community assembly. Previous work has identified dispersal, niche differentiation, and habitat heterogeneity as crucial parameters that determine metacommunity dynamics and stability in response to disturbance. However, it remains unclear whether the parameter combinations that are predicted to confer stability do so over long time… Read more »
Project Summary: Many global change drivers (GCDs) lead to chronic alterations in resource availability. As communities change through time in response to these GCDs, the magnitude and direction of ecosystem responses is also predicted to change in a non-linear fashion. We propose to examine whether plant community dynamics are predictive of shifts in ecosystem function… Read more »
Mention “diversity” to most ecologists, and they start talking about species richness. Indeed, LTER leads the way investigating how biodiversity enhances ecosystem productivity, efficiency, and stability. The LTER Network has an opportunity to likewise take a prominent leadership role fostering a diverse scientific community and supporting the full inclusion and participation of all its members.
We request funds for a working group to synthesize existing data within the LTER network on nitrogen mineralization and nitrification, soil respiration and soil moisture and to develop protocols for a new tightly coordinated, network-wide effort to develop a long-term data stream on these variables. The primary activity would be a workshop to be held at the Cary Institute of Ecosystem Studies.
Background: The range of sites within the LTER network provides an excellent
opportunity to understand aquatic and soil OM (organic matter) dynamics in diverse
ecosystems in order to develop overarching hypotheses about OM dynamics on a larger
scale in the context of the global carbon cycle. Dissolved organic material (DOM) is a major pool of organic carbon in all aquatic ecosystems, has high concentrations in soil interstitial water, and can be transported from soils into aquatic ecosystems.
Background: The potential for abrupt transitions in ecosystem processes may increase as climate change continues to accelerate1,2. While this trend is of great concern, our understanding of how to identify when and why abrupt transitions occur has been informed almost exclusively by theory. In order to enhance the prediction and management of these changes for different ecosystems, Bestelmeyer et al.3 developed a systematic approach for identifying the occurrence of transitions, the leading indicators, and the underlying mechanisms.