trophic level


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trophic level

[′träf·ik ‚lev·əl]
(ecology)
Any of the feeding levels through which the passage of energy through an ecosystem proceeds; examples are photosynthetic plants, herbivorous animals, and microorganisms of decay.
References in periodicals archive ?
The FiB is estimated for the time series of landings using the first year as a reference; it takes into account both catch and mean trophic level (Piet & Panovi, 2005).
Our results suggested that both tuna species employed an opportunistic predation strategy, but significant dietary differences showed that they occupy different trophic levels, and that there is no food competition between yellowfin and skipjack tunas in the eastern tropical Pacific Ocean.
postica was the only prey (or the major food source), Se was biomagnified across the 3 trophic levels and was bioaccumulated at levels 4 times higher than when P.
Among the South African katydid assemblage, species with varying trophic levels were evenly spread across the threat status categories (Fig.
For example the apex predators in one food web might occupy the fourth trophic level, while those of another food web might occupy the sixth.
We considered an isotopic fractionation across trophic levels of 3.
The differences in signatures of gastropods suggest that they belong to different trophic levels, as was found in the coast of the Bay of Brest (Grail et al.
where Yi is the yield for the species i; TLi mean trophic level of species i and S the total number of species (41).
15]N) indicates the trophic position of an organism (Vander Zanden & Rasmussen 1996), the simultaneous analysis of C and N isotope ratios can reveal how the carbon is transferred from primary energy sources to upper trophic levels (Smyntek et al.
j] is die trophic level of prey i in the diet of predatory.
Likely, Spiny Dogfish occupy a similar ecological role as an upper trophic level predator as do other shark species in other intact Eelgrass beds of the Pacific coast of North America.
Low trophic level fisheries, or forage fisheries, are fisheries that target the small things in the sea, like krill, or sardine or anchovy.