PPT-Trophic networks

Typical terrestrial food with six trophic levels and 15 functional groups Each functional group guild may contain many species Plant producers Herbivores Small predators Large predators. Elisa, Chelsea, Ellie. Trophic Cascades. Herbivores can limit plant populations, but…. In most places, plants are abundant and herbivores don’t limit plant growth. So…why is the world green?. HSS hypothesis. How do populations interact?. Populations compete amongst themselves & . between . other populations. …amongst themselves. Populations compete amongst themselves & between other populations. . Community Ecology. Community. = group of populations of different species living close enough to interact. Interspecific interactions. Can be positive (+), negative (-) or neutral (0). Includes:. TROPHIC LEVELS. An organisms trophic (feeding) level is determined by the organism’s source of energy. There are 3 main trophic levels in a food web.. Autotrophs. Heterotrophs. Saprotrophs. 1. AUTOTROPHS:. Autotroph:. Heterotroph:. Food Chain:. Food Web:. Trophic Level:. Energy is transferred in ecosystems. Producers give E to . Consumers. Food chains show flow of energy (arrows  show where energy is going). Relative importance of . allochthonous. versus autochthonous sources of. nutrients. sediments. o. rganic matter (dissolved and particulate). Productivity within a Watershed. Wetland very productive. In no particular order:. Steve Nelson, BYU Dept. of Geological Sciences. Sam . Rushforth. , . Rushforth. Phycology. The question:. What was the trophic state of Utah Lake prior to European settlement and how has it changed as development proceeded?. using various models including . food chains. , food webs, and ecological pyramids. Lesson frame. :. We will analyze the flow of energy and matter through a food chain.. I will complete the Looney Labels Food Chain activity. LEVELS. ECOLOGICAL. PYRAMIDS. The . ____. is the . ______________. for food chains.. . is a sequence of feeding relationships describing . ______. ___________________. .. source. Konstantinos G. Papadopoulos, . Efthymios. S. . Lytras. , Stylianos A. . Samios. , Marina N. . Despotidou. , . Georgios E. . Katsouras. , Alexandros D. . Dosis. , Nikos D. . Tsalas. 2. Definition of Trophic State. Mrs. Milam. Adapted from Ms. Davies. 5.1.1 Define . species, habitat, population, community, ecosystem . and . ecology.. Ecology. : . . Environment has 2 components: . . . Left: Image from Wikimedia Commons of one of the earliest known depictions of a food web, by Victor . Summerhayes & Charles Elton (1923) for Bear Island, Norway. Right: Provenance of “A simplified food web for Northwest Atlantic” unknown . WHAT IS ZOOPLANKTON?. Zooplankton are . a type of heterotrophic . plankton.. R. ange . from microscopic organisms to large . species, . such as jellyfish. .. . Zooplankton are found within large bodies of . PRESS SLIDE SHOW. Objectives. Realise . in every food chain there is a producer and consumers (4b). Draw food chains from list of animals given(4b. ). Describe the feeding relationships shown by food chain (.