A trophic level on the food chain.    From Wordnet, Princeton University. 

Each segment of the food web within which organisms take in food in the same manner is called a trophic level.    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

Chemicals in the brain called trophic factors, released during activity, may be at the heart of this saving effect.    From Wordnik.com.  [WN.com - Articles related to Team Finds Promising New Drug Target For Alzheimer's] Reference

The target cells then release a flood of chemicals, called trophic factors, that strengthen the incipient connections.    From Wordnik.com.  [Your Child's Brain] Reference

The new limb was in excellent condition and there was neither oedema nor any kind of trophic trouble.    From Wordnik.com.  [Alexis Carrel - Nobel Lecture] Reference

What determines the strength of a trophic cascade?.    From Wordnik.com.  [Top-down control] Reference

Such multi-level effects are called "trophic cascades.".    From Wordnik.com.  [Top-down control] Reference

Stable isotopes and planktonic trophic structure in Arctic lakes.    From Wordnik.com.  [Arctic freshwater environments] Reference

Generally, the higher the trophic level, the smaller the production.    From Wordnik.com.  [General description of the Arctic biota] Reference

A large trophic sacral bed-sore steadily increased in depth and size.    From Wordnik.com.  [Surgical Experiences in South Africa, 1899-1900 Being Mainly a Clinical Study of the Nature and Effects of Injuries Produced by Bullets of Small Calibre] Reference

The ups and downs of trophic control in continental shelf ecosystems.    From Wordnik.com.  [Bottom-up control] Reference

In reality, the trophic level of some plankton is not straightforward.    From Wordnik.com.  [Plankton] Reference

Parallel longterm trends across four marine trophic levels and weather.    From Wordnik.com.  [Effects of climate change on the biodiversity of the Arctic] Reference

Redistribution of grazers will affect underlying trophic structure (-/?).    From Wordnik.com.  [Effects of climate change on general hydro-ecology in the Arctic] Reference

The lake trophic state in 51e is generally higher than in 51d to the south.    From Wordnik.com.  [Ecoregions of Wisconsin (EPA)] Reference

The removal of marine predators by fisheries and the impact of trophic structure.    From Wordnik.com.  [Effects of climate change on general hydro-ecology in the Arctic] Reference

Consequently, marine food chains are short, with a maximum of five trophic levels.    From Wordnik.com.  [General description of the Arctic biota] Reference

The loss of organic matter between one trophic level and the next is about 75 to 80%.    From Wordnik.com.  [General description of the Arctic biota] Reference

Bottom-up ecosystem trophic dynamics determine fish production in the Northeast Pacific.    From Wordnik.com.  [Bottom-up control] Reference

Shared predators and indirect trophic interactions: lemming cycles and arctic-nesting geese.    From Wordnik.com.  [General characteristics of arctic species and their adaptations in the context of changes in climate and ultraviolet-B radiation levels] Reference

Perhaps it will eventually explode into a devastating trophic cascade and ecological disaster.    From Wordnik.com.  [Bill Chameides: Gulf Oil Blowout and Gusher: Environmental Catastrophe or Much Ado About Nothing?] Reference

trophic interactions in Arctic ecosystems and the occurrence of a terrestrial trophic cascade.    From Wordnik.com.  [Arctic freshwater environments] Reference

COOPER: That trophic cascade because of the wolf's presence here doesn't stop with what it kills.    From Wordnik.com.  [CNN Transcript Oct 23, 2007] Reference

Similarly, in marine systems, bottom-up effects are sometimes only manifested one trophic level up.    From Wordnik.com.  [Bottom-up control] Reference

What is the proportion of food that is passed on from each food or “trophic” level to the next?.    From Wordnik.com.  [Ecology] Reference

Then at a somewhat higher level, self-differentiation, and the trophic reaction to functional stimuli.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

No wasting of the interossei, skin normal except for a large trophic blister on the dorsum of the hand.    From Wordnik.com.  [Surgical Experiences in South Africa, 1899-1900 Being Mainly a Clinical Study of the Nature and Effects of Injuries Produced by Bullets of Small Calibre] Reference

The variable climate and hydrography cause changes in reproduction conditions and trophic relationships.    From Wordnik.com.  [Sea of Okhotsk large marine ecosystem] Reference

That is, bottom-up controls arise from near the bottom of the food web, below the trophic level in question.    From Wordnik.com.  [Bottom-up control] Reference

There is a threshold, probably tied to increased primary production, when entirely new trophic levels appear.    From Wordnik.com.  [Broad-scale effects of climate change on freshwater systems in the Arctic] Reference

Significantly, the mean trophic level of the fish caught stays the same or increases in many parts of the ocean.    From Wordnik.com.  [Global Environment Outlook (GEO-4)~ Chapter 9] Reference

Zooplankton data confirmed strong bottom-up trophic linkages between phytoplankton, zooplankton, and resident fish.    From Wordnik.com.  [Bottom-up control] Reference

Early trophic sacral bed-sores developed and steadily increased in depth and extent, slighter ones developed on the heels.    From Wordnik.com.  [Surgical Experiences in South Africa, 1899-1900 Being Mainly a Clinical Study of the Nature and Effects of Injuries Produced by Bullets of Small Calibre] Reference

This makes them particularly suitable for trophic studies, as for example the research using isotopes of nitrogen and carbon.    From Wordnik.com.  [Arctic freshwater environments] Reference

Active neurons respond better to trophic factors than inactive ones, Barbara Barres of Stanford University reported in October.    From Wordnik.com.  [Your Child's Brain] Reference

The Chinese obtain very high production with several species of carp that feed at different trophic levels in freshwater ponds.    From Wordnik.com.  [4 Coastal Mariculture] Reference

There is a complex set of ecologic processes affecting trophic enrichment, food distribution, and advection of swimming organisms.    From Wordnik.com.  [Arabian Sea large marine ecosystem] Reference

Natural fluctuations in the recruitment of some species have led to reductions in body size and trophic level of catch in this LME.    From Wordnik.com.  [Yellow Sea large marine ecosystem] Reference

Moreover, in most ecosystems, species diversity is higher than the level required for efficient biogeochemical and trophic function.    From Wordnik.com.  [Species influences upon ecosystem function] Reference

They occupy the very apex of food chain, and the flows of energy and matter are significantly bigger at lower tiers of trophic pyramid.    From Wordnik.com.  [Giving evidence to the Chilcot inquiry, Tony Blair said: “I...] Reference