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- relationship with environment may be modified bybiotic interactions (competition, predation)physiological optimumecological optimum Sp iPerformancePerformanceSp i Sp k Sp iEnvironmental factorEnvironmental factor- absence of competitors - competitor with similarrequirements- fundamental niche - describes the overallpotentialities of a species in terms of resourceutilisation- realised niche - describes the more limitedrange of resources for organism to maintain viablepopulationn even in the presence of competitor &predators (smaller than fundamental niche)
• co-existence- competing can co-exist as aresult of niche differentiation- differentiation of realisedniches - ‘partitioning’ ofresources- if no niche differentiation -one species may excludethe other (competitiveexclusion)ABA winsco-existenceB winsBAR 1R 2region of overlapuse ofresourcesspecies ispecies kresource gradientuse ofresourcesniche breadthresource gradient
Page 1 and 2: Corsi di Laurea in SFA ed in DISMIT
Page 3 and 4: Parametri di una popolazione:•Den
Page 5 and 6: La grandezza della popolazione può
Page 7 and 8: Rapporto tra i sessi costante♂=
Page 9 and 10: Density-dependent population growth
Page 11 and 12: Examples of Sigmoidal GrowthEsempi
Page 14 and 15: Red Queen DynamicsResults from a co
Page 16 and 17: Populations exist in heterogeneousl
Page 18 and 19: Interazioni interspecificheNessunai
Page 20 and 21: Bufaga africana(Buphagus africanus)
Page 23 and 24: Remora(Echeneisnaucrates)Predazione
Page 25 and 26: Antibiosi e allelopatiaInterazioni
Page 27 and 28: Nicchia ecologicaLa nicchia ecologi
Page 29: - 3 niche dimensions:Nicchia ecolog
Page 33 and 34: Esperimenti di Park (1962)Esperimen
Page 35 and 36: Feeding positions of fivesympatric
Page 37 and 38: K - strategists• Popolazione aliv
Page 39 and 40: Curve di sopravvivenzaType I -high
Page 42 and 43: Initially ecologists tried toexplai
Page 44: O.N. Bjørnstad, M. Peltonen, A.M.

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