trophic level


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trophic level

n.
The position of a species or a group of species within a food chain or food web.

troph′ic lev`el


n.
Ecol. each of the levels of feeding that together form a food chain.
[1940–45]
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The average body masses (M) of each functional group was calculated depending on their trophic level (TL) according to (Gomez-Canchong et al, 2013):
The various forms of Se are known to be transferred between trophic levels from plants to insect herbivores and on to insect predators, although the bioavailability of each form at each trophic level is not fully understood.
trituberculatus belongs to the first class carnivorous animal, and the trophic level is about 3.
Based on similar criteria to that of the DBI, katydids were assessed based on three sub-indices: 1) Red List Status, 2) geographical distribution, and 3) life history traits (in which the mobility and the trophic level at which the species feed are scored on the basis of objective criteria, these two values are then summed, and scored accordingly).
In ecological systems this is best expressed by Lindeman's concept of ecological efficiency, which is represented as the "ratio of the energy flux into [a] trophic level to the energy flux into the level below" (Colinvaux and Barnett, 1979).
Tawi-Tawi has a vibrant marine ecosystem and high trophic level fishes, whose populations are reportedly rapidly declining in most parts of the country due to overexploitation and illegal fishing.
Stable isotope analyses on dietary reconstructions rely on tissue signatures that provide valuable information on trophic level and potential food source choice in the diet of a given organism (Hobson & Sease, 1998; McCutchan et al.
In the dual isotope plot, three trophic levels were evident between the gastropods and the seaweed (trophic level one considered for primary producers as the base of the food chain; Fig.
When the trophic level for one species was unavailable, it was estimated using the value from Fishbase for the same genus of species concerning its diet (11).
1998) documented the results of such extractive activities as "fishing down marine food webs": a gradual change in landings from long-lived, upper trophic level species to short-lived, lower trophic species.