Omnivory and food chain length in zooplankton food webs
After using simplified keys to identify the organisms they found, the group constructed food webs
and talked about which organisms would most likely appeal to the bass as food.
Many studies of stream and lake food webs
have been prompted by interest in monitoring pollution levels and determining the mode by which pesticides enter and affect ecosystems (Ricklefs, 1973).
This key question of current ecology will be studied using quantitative surveys of plant-herbivore-parasitoid food webs
within paired sets of tropical and temperate forests from six continents, in Papua New Guinea (PNG), Gabon, Panama, the Czech Republic, Japan, and USA, sampled using canopy cranes, truck-mounted elevated platforms and forest felling.
The researchers create their model food webs
following on from their experiences with real ecosystems; what eats what, the composition of the species' life cycles, and how they interact with others.
As we basically fish down global food webs
in all these different ecosystems, we will in essence be restructuring communities.
Stable isotopes are relatively consistently fractionated by biological and physical processes as they pass through food webs
becoming heavier by 3%0 to 4%0 for N and by 1%o to 2%0 for C with each trophic transfer (Peterson & Fry 1987, Cabana & Rasmussen 1994).
Seashore Food Chains (0778719499) surveys how plants to carnivores obtain food from sun, sand, and surf; Prairie Food Chains (0778719472) discusses how food is made and consumed in a prairie environment--something only touched upon in most competing 'food chains' books which focus on rainforests and shore primarily; and Tundra Food Chains (0778719466) discusses tundra animals, plants, and food webs
The book is divided into four sections, the first of which addresses the topic of structure and function within food webs
And it is the species high in the ocean's food webs
that we fish for.
The possibility of increased endotherm-based constraints on terrestrial food chains was considered by Ryszkowski and French (1982), and Yodzis (1984) attempted to directly explore predictions extending from this hypothesis, using a collection of published food webs
available at that time (N = 34, all of which were quite small and poorly resolved by today's standards).
Arctic Cod, a small, ice-affiliated forage fish, is the most abundant marine fish and is an important link in marine food webs