COMMUNITIES Key Properties of Communities Diversity Species richness
- Slides: 43
COMMUNITIES
Key Properties of Communities • Diversity – Species richness: total # of species – Species diversity: high if no one species predominates • Prevalent form of vegetation (terrestrial communities) • Stability-ability to resist change after disturbance • Trophic structure-feeding relationships
Helpful? Harmful? Or no effect? COMMUNITY INTERACTIONS
Interspecific Interactions in Communities Interspecific interaction #1 Competition
Competitive exclusion • When cultured separately, both species go to carrying capacity • When cultured together, COMPETITION! • Slight reproductive advantage leads to elimination of inferior species
Restating Competitive Exclusion in Nature • Niche: how a species fits into an ecosystem • Restate competitive exclusion principle: similar species CANNOT coexist if they have the exact same niche
Competitive Exclusion
Resource Partitioning • Competition between these lizards in Dominican Republic is minimized because lizards’ perches vary
Resource Partitioning in Coastal Community Black skimmer seizes small fish at water surface Flamingo feeds on minute organisms in mud Brown pelican dives for fish, which it locates from the air Scaup and other diving ducks feed on mollusks, crustaceans, and aquatic vegetation Avocet sweeps bill through mud and surface water in search of small crustaceans, insects, and seeds Louisiana heron wades into water to seize small fish Dowitcher probes deeply into mud in search of snails, marine worms, and small crustaceans Oystercatcher feeds on clams, mussels, and other shellfish into which it pries its narrow beak Herring gull is a tireless scarialavenger Ruddy turnstone searches under shells and pebbles for small invertebrates Knot (a sandpiper) picks up worms and small crustaceans left by receding tide Piping plover feeds on insects and tiny crustaceans on sandy beaches
Resource partitioning with warbler species
Three-way community interaction • 1) caterpillar injures plant • 2) caterpillar saliva stimulates plant to release a waspattracting vapor • 3) wasp stings caterpillar and then lays eggs in caterpillar
Interspecific Interactions in Communities Interspecific interaction #2 Predation
Predator-Prey Relations How do plants avoid being eaten by herbivores? Physical Defense: Thorns Chemical Defense: Poison
Adaptations Related to Predation • Organisms have evolved certain adaptations – Predator adaptations (claws, poison, jaws…) – Plant defenses (thorns, spines, chemicals…) – Prey defenses (peppered moth)
Cryptic Coloration= Camouflage Evolution of camouflage- example (video clip)
Bright Coloration-warning symbol
Mimicry is another form of coloration defense. Mimicry – a phenomenon in which one species benefits by a superficial resemblance to an unrelated species
Deceptive Coloration
Two forms of Mimicry: 1) Batesian mimicry – a palatable or harmless species mimics an unpalatable or harmful species. What would be the advantage of this? 2) Müllerian mimicry – two or more unpalatable or brightly colored species resemble each other What would be the advantage of this?
Batesian Mimicry
Can you tell the difference?
Unpalatable Palatable
Blue Jay eats Monarch
Vomits Monarch
Learns to avoid Monarchs!
Cuckoo bee Yellow jacket Müllerian mimicry Both have stingers that release toxins
What is a KEYSTONE? Keystone Species Keystone Predators
Keystone Species http: //www. grinningplanet. com/2004/06 -22/keystone-speciesarticle. htm
Keystone Predators •
Watch video clips… • Camouflage, Combat, and Sharkboy (plus a good blood review!) • Trials of life Video
Interspecific interaction #3: Symbiotic Relationships
Symbiotic Relationships • An interspecific interaction in which one species, the symbiont, lives in or on another species, the host
Parasitism = (+/-) interactions • A symbiotic relationship in which one organism benefits while the other is harmed • The parasite – Obtains its nutrients by living in or on its host organism
Commensalism = (+/0) interactions Symbiotic relationship where one species benefits and the other is not affected positively or negatively Possible examples – 1. Clown fish and anemone 2. Remora (sucker fish) and sharks
Mutualism = (+/+) interactions • Interactions where both species benefit Examples: • flowers and pollinators • Protozoa and termites • Nitrogen fixing bacteria in roots of plants
Yucca and Yucca Moth
Summary Find examples of these from the video Living Together, in the Trials of Life series.
Species richness vs. diversity • Community 1 vs. Community 2: how do they compare in richness and how do they compare in diversity
Prevalent Vegetation • Looks not only at type of vegetation, but also how arranged…. this determines the type of animals that live in a community
Community Stability • How does a community respond after a disturbance? • Ex: cedar and hemlock trees withstands lightning fires • Versus Grassland devastated by a fire
Trophic Structure
- Species evenness definition
- How to calculate species richness
- What is ecosystem biodiversity
- Genetic diversity vs species diversity
- Steps in primary succession
- Channel richness
- Formal small group networks
- Why communicate
- Channel richness
- Leadership is
- Channel richness
- Channel richness
- Reach richness
- Media richness
- Media richness
- Interactional model of communication
- Keystone plant
- The main reason that there are relatively few invertebrates
- Species diversity:
- Species diversity
- What are key activities in a business model
- Business model canvas tripadvisor
- Parasitism
- Ecosystems and communities chapter 4 answer key
- 6.1 niches and community interactions answers
- Facts about elephants
- Semi permiable
- Section 15-1 the puzzle of life's diversity answers
- Nomenclature in a sentence
- Finding order in diversity
- Section 15-1 the puzzle of life's diversity answer key
- Biology chapter 22 plant diversity answer key
- Chapter 20 section 2 diversity of fungi
- Section 15-1 the puzzle of life's diversity answer key
- Chapter 22 plant diversity answer key
- Chapter 17 organizing life's diversity answer key
- Key concepts of diversity
- Intensive and extensive properties
- Physical property and chemical property
- Kesler science sound waves answer key
- Lesson outline lesson 2 - physical properties answer key
- Chapter 9 properties of transformations answer key
- Elements and their properties section 1 metals answer key
- Matter-properties and changes answer key