Rising Sea Levels Rising Sea Levels Food Webs

Rising Sea Levels

Rising Sea Levels

Food Webs and Pyramids

What is a food web? Several food chains connected together Shows many different paths of how plants and animals are connected Each level of animal represents a different trophic level Which is an organisms position on the food web

Parts of a food web Primary Producer: produces own food by photosynthesis Usually green plants Primary Consumer: animals that consume only plant matter Aka herbivores-rabbits and cows Secondary Consumer: animals that eat primary consumers (herbivores) Aka carnivore- owls and foxes Tertiary Consumer: animals that eat secondary consumers Carnivores that eat other carnivores

Energy Pyramids Model of energy flowing in a community They are measured from the bottom trophic level to the top Primary Producers Primary Consumers Secondary Consumers Tertiary Consumers

Ten Percent Rule An average of only 10% of the energy in one trophic level is passed to the next trophic level 90% is used by previous trophic level

Why only 10%? Energy is used up for daily life activities Not all organisms that die are eaten by animals on the next trophic level Not all parts of organisms are eaten and digested for energy

Biomass Pyramids Amount of energy available in the form of organic matter of organisms There is a gradual decrease in biomass from producers to higher trophic levels 2 common types Terrestrial Aquatic

Biomass Pyramids

Aquatic Pyramid Why is it inverted (upside down)? Smaller weight of producers are supporting consumers of a large weight

Hunting Overfishing Deforestation Human Impact • Destroys the environment in which the organisms eat or make their food • Removes food source for other organism • Could lead to extinction of species