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.

trophic level

any of the feeding levels that energy passes through as it proceeds through the ecosystem. For example, primary producers (see PRIMARY PRODUCTION) form the first level in most ecosystems, followed by PRIMARY CONSUMERS (herbivores) up to the top predator level. See PYRAMID OF NUMBERS, BIOMASS.
References in periodicals archive ?
where d is the exponent of the relationship between the trophic level and the body mass of each functional group, and rsd is a stochastic variable that is randomly sampled from a normal distribution (mean = 1, SD = 2).
Our calculations indicated that the prey of skipjack and yellowfin tunas have trophic level values between 3.
Furthermore, they provide new insight to previous findings and form the basis for proposing the quality of the food stream is an important consideration when investigating the biotransfer of trace elements across trophic levels.
The CFR katydids did not differ significantly from all South African katydids in terms of the number of species assigned to each threat status, endemism level, mobility class or trophic level ([[chi square].
However, none of our analyses sought to assess directly the average trophic position of individual species (taxa) but rather the relative proportion of endotherms at each trophic level across all FCPs in a system.
ventricosus may hint at a similar trophic level for both species (omnivorous) which is widely accepted for T.
4 [per thousand] has been common between trophic levels (Minagawa & Wada 1984), although some variations in the fractionation value have been observed, depending on the tissue (McCutchan et al.
When the trophic level for given species was unavailable, it was estimated using the value from Fishbase for the same genus or species.
The central role of the zooplankton in the carbon flow to upper trophic levels in lakes is well established, but the origin of the carbon (energy) that supports zooplankton is less well understood.
To evaluate die effects of trawling on die trophic structure of die ecosystem in question, the historical changes of die mean trophic level (T[L.
In this region, North Pacific Spiny Dogfish (Squalus suckleyi Girard 1854; Ebert and others 2010), hereafter Spiny Dogfish, are currently considered an abundant upper trophic level predator (Harvey and others 2010).
Through your work, you have initiated some large-scale conservation programs to help the African penguin and other seabirds at risk of low trophic level fisheries impacts, what has that entailed?