habitat vs. niche (14.1, pgs. 428 - 429) • habitat – where an organism lives, all the conditions (living, nonliving) Examples. • Niche –the job, role of an organism in the habitat (food, behavior, Abiotic factors) Examples. • school analogy • students, teacher, principals, food service are all niches in the same habitat
competition(14.1, pgs. 429 - 430) • competitive exclusion Two species competing for same resource, one better suited pushes other out/extinct. Examples. Eagle vs osprey • niche partitioning –two animals divide existing resources. Squirrels Red v Gray • evolutionary response – Two species adapt to the conditions. Example different teeth.
competition(14.1, pgs. 429 - 430) • competitive exclusion (example) – 2 species in same niche; 1 does it better EX: Michigan clams vs. zebra mussels (no predator) (predators like carp, sheephead)(no predator, rapid growth) • ecological equivalents – two different species that fill same niche in different regions Northern Flying Squirrel vs Southern Flying Squirrel
Relationships/interactions(14.2, pgs. 431 - 434) Competition is good for genetics. • Interspecific – 2 different species (wolf vs. wolverine over their food) 2. Intraspecific – same species ( 2 deer fighting for the best mate) Predation – kill and eat (snakes, cheetah)
Relationships/interactions(14.2, pgs. 431 - 434) symbiosis – 2 different species have a relationship over food • mutualism – both organisms benefit (ex: flower gets pollinated + bee gets food) • commensalism – one benefits, one unaffected (ex: bird makes nest + tree doesn’t care) • parasitism - one benefits, one is harmed (ex: tapeworm gets food, dog loses nutrients)
Human Our eyelashes are home to tiny mites that feast on oil secretions and dead skin. Without harming us, up to 20 mites may be living in one eyelash follicle. Ø Demodicids Eyelash mites find all they need to survive in the tiny follicles of eyelashes. Magnified here 225 times, these creatures measure 0.4 mm in length and can be seen only with a microscope. + Ø + Organism is not affected Organism benefits