1 / 18

Chapter 5 Biodiversity, Species Interactions, and Population Control

Chapter 5 Biodiversity, Species Interactions, and Population Control. Species Interact in Five Major Ways. Interspecific Competition Predation Parasitism Mutualism Commensalism. Parisitism + - (host). tick. tapeworm. Cordyceps (fungus) … “bite & die”.

ion
Download Presentation

Chapter 5 Biodiversity, Species Interactions, and Population Control

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 5 Biodiversity, Species Interactions, and Population Control

  2. Species Interact in Five Major Ways • Interspecific Competition • Predation • Parasitism • Mutualism • Commensalism

  3. Parisitism + - (host)

  4. tick tapeworm Cordyceps (fungus) … “bite & die”

  5. Mutualism: + + Clownfish with Sea Anemone Livestock with tickbird

  6. Mutualism (cont’d)+ + Egyptian Plover Cleaning crocodile’s teeth

  7. Mutualism (cont’d) Remora fish and shark

  8. Commensalism: + doesn’t care

  9. Science Focus: Threats to Kelp Forests • Kelp forests: biologically diverse marine habitat • Major threats to kelp forests • Sea urchins • Pollution from water run-off • Global warming

  10. Purple Sea Urchin Fig. 5-A, p. 108

  11. Populations Can Grow, Shrink, or Remain Stable (1) • Population size governed by • Births • Deaths • Immigration • Emigration • Population change = (births + immigration) – (deaths + emigration)

  12. No Population Can Grow Indefinitely: J-Curves and S-Curves (1) • Size of populations controlled by limiting factors: • Light • Water • Space • Nutrients • Exposure to too many competitors, predators or infectious diseases

  13. No Population Can Grow Indefinitely: J-Curves and S-Curves (2) • Environmental resistance • All factors that act to limit the growth of a population • Carrying capacity (K) • Maximum population a given habitat can sustain

  14. Some Ecosystems Start from Scratch: Primary Succession • No soil in a terrestrial system • No bottom sediment in an aquatic system • Takes hundreds to thousands of years • Need to build up soils/sediments to provide necessary nutrients

  15. Primary Ecological Succession Fig. 5-19, p. 119

  16. Some Ecosystems Do Not Have to Start from Scratch: Secondary Succession (1) • Some soil remains in a terrestrial system • Some bottom sediment remains in an aquatic system • Ecosystem has been • Disturbed • Removed • Destroyed

  17. Natural Ecological Restoration of Disturbed Land Fig. 5-20, p. 120

  18. Some Ecosystems Do Not Have to Start from Scratch: Secondary Succession (2) • Primary and secondary succession • Tend to increase biodiversity • Increase species richness and interactions among species • Primary and secondary succession can be interrupted by • Fires • Hurricanes • Clear-cutting of forests • Plowing of grasslands • Invasion by nonnative species

More Related