Environmental scientists led by Prof. Daniel Jacob found that 38 U.S. national parks are experiencing "accidental fertilization" (from ammonia emissions) at or above a critical threshold for ecological damage.
The initial consequences of wolf recovery support the premise that wolves may naturally achieve densities above their threshold for ecological effectiveness and contribute to significant changes in ecosystems, including the amelioration of ungulate-caused landscape simplification.
Currently, there is no widely accepted tool for predicting thresholds of ecological concern that would support a Tier 0 assessment.
We'll have to see, but it seems to me that as far as the gulf is concerned, we've reached the threshold for peak ecological oil.
30 Further applications of our approach in other populations and clinical contexts is required to elucidate factors modifying thresholds for association with ecological variables, and to adapt antibiotic stewardship or infection control policies to local scenarios.
Our DSS incorporated fuzzy arguments that compared current condition of selected indicators against associated ecological thresholds for each indicator.
These models demonstrate the effectiveness of using derived multi-date spectral indices as proxies for species occurrence on the landscape, the importance of selecting thresholds for invasive species cover to evaluate ecological risk in species distribution models, and the applicability of Landsat 8 OLI and the Software for Assisted Habitat Modeling for targeted invasive species management.
In recent years the existence of multiple stable states, bifurcations and thresholds in ecological systems has been a focus for ecologists, with examples in a variety of aquatic, marine and terrestrial systems (Scheffer et al., 2001).
As any other method, they rely upon expert judgments for selecting relevant metrics, combining metrics into a score and defining thresholds between ecological status classes in the scoring scale.
Sonderegger, D. L., Wang, H., Clements, W. H. & Noon, B. R. Using SiZer to detect thresholds in ecological data.
