Define Trophic levels. Trophic levels synonyms, Trophic levels pronunciation, Trophic levels translation, English dictionary definition of Trophic levels. n. The position of a species or a group of species within a food chain or food web. American Herita
To circumvent this problem, this study adopted the complementary use of bioindicators representing different trophic levels and providing different type of information, in an innovative approach to integrate knowledge and to estimate the overall health state of ecosystems. The approach is illustrated using...
We propose a network model of food webs in which the degree of the effects of the trophic level on speciation can be adjusted continuously by a single parameter. The restriction limits the number of species at each level and the establishment of prey-predator relationships between distant levels...
Higher trophic levels are considered to be negligible in the overall carbon balance of the Oosterschelde and were therefore not included in the SMOES model. Nevertheless fish, birds and seals are quite conspicuous members of the ecosystem, both before and after completion of the Delta plan. ...
Effects of ocean acidification, ocean warming, and their interaction on marine trophic levels Overall, OA, OW, and their combination affected marine species differently (QM = 15.39,p = 0.002; Supplementary Table3). Our data revealed that both OA (LnRR = \(-\)0.110, 95% CI ...
(1 mg mL−1) was added to each tube as an internal standard. One part of the rhizosphere soil was homogenized in 0.5 mL methanol solution (Vmethanol: VH2O = 3:1) using a ball mill at 45 Hz for 4 min and then ultrasonically treated 5 times for a period of 5...
(2) Within all three grassland systems there was, on average, a short period of one to four months during the dry season when available food was lower than the requirements of the herbivore trophic level. Such a shortage would be sufficient to limit the herbivore populations. (3) The ...
This study focuses on two issues, the external phosphorus loading and dreissenids' invasion, and investigates the interactions of the responses of the lower trophic levels to these two stressors. I construct an ecological model, EcoLE, based on a USEPA two-dimensional hydrodynamic and water ...
Trophic levels (TLs) for individual groups ranged from 1.0 to 4.22. Ecotrophic efficiency for most of the small pelagic fishes was found to be greater than 0.7. For hilsa it was 0.853, indicating high exploitation of this fish within the system. The nBoB was estimated to be a low ...
3,4,5,6. The phytoplankton blooms regulate the food availability for higher trophic levels, making primary production central to both the aquatic food web and the Indian Ocean rim population that is dependent on marine fisheries for their livelihood...