But does everyone know that the beloved household dog is descended from wolves? Indeed, recent genetics research suggests that all domestic dogs originated from wolves in East Asia about 15, years ago. Leonard et al. Fish and Wildlife Service. Wolf advocates romanticize them as symbols of the wild. But if we prize our dogs in part because of how useful they are — for herding, guarding, retrieving, guiding, and so forth — then our view of wolves must change.
Trophic Cascade: The Case For Wolves
The Wolf, the Moose, and the Fir Tree: A Case Study of Trophic Interactions
The measurement results of these parameters are higher at the depth points and lower on the surface. The Chl-a parameter is evaluated mesotrophic with data at the depth, and oligotrophic with data. At the same time, this was verified by calculating the non-algal turbidity coefficient Kna. It is observed that there is a low correlation between Chl-a and Kna, however a low correlation with TN, and a high correlation with TP. Non-algal particles in the dam lake may occur due to surface runoff and soil erosion from the agricultural area and human settlements.
Building a More Intricate Web
Environmental Sciences Europe volume 32 , Article number: Cite this article. Metrics details. The European Water Framework Directive WFD requires the monitoring of biota—preferably fish—to check the compliance of tissue concentrations of priority substances PS against substance-specific environmental quality standards EQSs. In monitoring programs, different fish species are covered, which often are secondary consumers with a trophic level TL of about 3. For harmonization, a normalization of monitoring data to a common trophic level is proposed, i.
To browse Academia. Skip to main content. Log In Sign Up. Download Free PDF. Variability of higher trophic level stable isotope data in space and time - a case study in a marine ecosystem Rapid Communications in Mass Spectrometry,