Transcript Notes #2
LaVigne Environmental Science Living Things in Ecosystems Chapter 2 Notes #2 How species interact with each other ►5 Major Interactions Among Biotic Factors in an Ecosystem Predation Competition Parasitism Mutualism Commensalism How species interact with each other Predation ► On organism kills& eats another organism ► Predator – the killer/eater ► Feed on the young & weak ► Limits the size of prey populations ► Prey – gets eaten/killed ► Prey declines the predators must find other prey ► How species interact with each other Predation Examples How species interact with each other ► Competition ►2 or more organisms of the same or different species attempt to use the same limited resources ► can occur evenly if there’s no contact (indirect) ► ex-2 insects, same plant, one feeds during the day, one at night How species interact with each other ► ► ► ► Parasitism parasite- organisms that live in or on another organism & feed on it w/o immediately killing it host- organism the parasite takes nourishment from organisms are negatively affected by parasites Mistletoe on an apple tree How species interact with each other Hungry Tick Full Tick Parasitism How species interact with each other ► Mutualism ►a cooperative partnership between two species in which both species benefit ► Example you & intestinal bacteria, bacteria aids you w/digestion you give bacteria warm home/food How species interact with each other Commensalism ► One species benefits, the other is neither harmed nor helped ► Remora & sharks attach to sharks & feed on scraps from their meals the sharks aren’t affected ► Commensalism is very rare How species interact with each other ► Commensalism or Mutualism?? The sea anemone and the clown fish…. Scientists tend to agree that it is commensalism, there is not sufficient documented proof that the anemone benefits in any way… Do the fish scare away other fish/predators??? Finding Nemo….do they keep the anemone clean??? Assignments ► Complete and Hand in the Transparency #2 worksheet with the Section 2.1 on the back (you received this on Friday) ► Complete the 2.2 Section review WS