Synthesizing population and community synchrony to understand drivers of ecological stability across LTER sites

Gammarid amphipod.

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 »

Scaling-Up Productivity Responses to Changes in Biodiversity

experimental plots with a variety of old field species

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 »

Advancing soil organic matter research: Synthesizing multi-scale observations, manipulations & models

deep soil profile, rich in organic matter, with grain growing on top

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 »

Global Patterns in Stream Energy and Nutrient Cycling

stream running through wetland

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 »

A synthesis to identify how metacommunity dynamics mediate community responses to disturbance across the ecosystems represented in the LTER network

Aerial of Cedar Creek

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 »

Integrating plant community and ecosystem responses to chronic global change drivers

Three individuals collecting samples in desert brush.

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 »

Coastal Wetland Ecology and Geomorphology

Goals. I propose a working group on coastal wetland ecology and geomorphology that will meet four times before April 2013 to develop and submit a Macrosystems Biology proposal to NSF. This working group proposal grew out of a working group (Modeling Wetland Processes) organized by S. Pennings and A. Burd at the 2012 LTER ASM, and contributes to the LTER Network Synthesis Theme of Coastal Zone Climate Change: Understanding and Adaptation.

Veg-DB Phase 2: Developing a cross-site system to improve development and access to synthetic vegetation databases

This working group will support the next stage of development for a LTER network-based system called Veg-DB that would provide improved access to vegetation data. LTER sites have become significant reservoirs of long-term data on changes in vegetation populations, structure, composition, and productivity. This information is essential to detect long-term trends, test hypotheses, and to evaluate simulation models; yet is extremely difficult to process on a site by site basis.

Exploring the Seasonal Synchrony of Catchment Nitrogen Dynamics: The Search for a Unifying Theoretical Framework

Contrary to the predictions stemming from the nitrogen saturation hypothesis (Stoddard, 1994), some forested long-term research sites in Eastern North America exhibit peak streamwater nitrate exports during the growing season. Some initial hypotheses about climatic controls (Mullholland and Hill, 1997) have recently been questioned (Goodale et al., 2009). This is a proposal to fund a working group to advance a synthesis on the seasonal patterns of inputs, processing, and output of Nitrogen to watersheds across Eastern North America.

Synthesis of stream ecosystem responses to nutrient enrichment at multiple trophic levels

The goals of this proposed LTER Synthesis Working Group are (1) to initiate and coordinate the integration of data from multiple sites on stream ecosystem responses to nutrient amendment, (2) to synthesize these data with a quantitative evaluation of functional responses at the microbial, primary producer, consumer and whole-stream levels, (3) to produce an NSF Research Coordination Network proposal that will expand data integration and synthesis efforts to members of the broader national and international stream ecology communities and (4) to promote interaction between LTER and the NEON expe