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Slide 2 Slide 3 Slide 4 Zalophus californianus Slide 5 Felis domesticus Slide 6 Slide 7 Dinofilariasis Slide 8 Slide 9 Slide 10 Slide 11 BIOTIC RELATIONSHIPS Slide 12 BIOTIC FACTORS Factors pertaining to or caused by living organisms EX: Amt. of methane gas produced by cow emissions Slide 13 COMMUNITIES DEF: Several different species living and interacting in the same habitat Note: Focus is only on the biotic relationships (NOT the abiotic factors) Slide 14 PREDATION Organism consumes another organism to satisfy caloric or nutritional needs. Slide 15 Slide 16 Slide 17 COMPETITION Organisms require similar biotic or abiotic factors for their survival, causing their populations to fluctuate in response to these shared demands. Slide 18 INTERSPECIFIC COMPETITION Competition for resources (i.e. food, space, water) that exists between populations of different species Slide 19 INTRASPECIFIC COMPETITION Competition between members of the same species Slide 20 INTRA- v. INTER- WHY IS INTRASPECIFIC COMPETITION GENERALLY MORE INTENSE THAN INTERSPECIFIC COMPETITION? Slide 21 COMPETETIVE EXCLUSION PRINCIPLE When two organisms or populations enter into competition (inter- or intraspecific), attempting to occupy the same niche, only one of the populations will survive and occupy that niche. Slide 22 Slide 23 Slide 24 SYMBIOSIS Literally translates to shared life Slide 25 PARASITISM Parasite benefits from relationship with host while host is negatively impacted Slide 26 Explain How does a parasitic relationship differ from a predatory relationship? In both, one organism is negatively impacted Slide 27 COMMENSALISM One organism benefits from the relationship while the second organism is not affected positively or negatively Slide 28 Slide 29 MUTUALISM Both organisms benefit from the relationship. Without each other, neither would survive. Slide 30 Pfisteria piscicides Slide 31 Slide 32 Slide 33 Which Biotic Relationship? Slide 34 Slide 35