powerpoint presentation - anju l
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SABARIGIRI COLLEGE OF EDUCATION(AFFILIATED TO THE UNIVERSITY OF KERALA&RECOG.BY NCTE)
ANCHAL,KOLLAM ,KERALA
B.Ed course 2013-2014
Presented By,Anju LNatural ScienceReg No:13379005
WELCOME
InteractionsinEcosystems
HabitatAll of the biotic and abiotic factors in the area where an organism lives
Lion habitat
Ecological Niche
All of the physical, chemical, and biological factors that a species needs to survive, stay healthy, and reproduce◦Food ◦Abiotic conditions ◦Behavior
Competitive Exclusion
When two species are competing for the same resources, one species will be better suited to the niche, and the other species will be pushed into another niche or become extinct
Invasive species may outcompete organisms that are native to a particular region
PredationThe process by which one species
captures and feeds upon another◦Heterotrophs can prey on autotrophs and
other heterotrophs
Predator – Prey Cycles
Prey outnumber predators
Increasing numbers of prey promote increases in predator populations
Symbiosis
A close ecological relationship between two or more organisms of different species that live in direct contact with one another◦Mutualism◦Commensalism◦Parasitism
MutualismAn interspecies interaction in which
both species benefit◦Flowers and pollinating insects◦Humans and intestinal E. coli◦Clown fish and anemones
CommensalismA relationship between two organisms
in which one receives an ecological benefit from another, while the other neither benefits or is harmed
Many ecologists believe that commensalism is rare, and that most such relationships are probably subtle mutualism or parasitism
ParasitismA relationship in which one species
benefits while the other is harmed.Many parasites have complex
lifecycles involving more than one host
Seen “Alien” ?
Tapeworm lifecycle
THANK YOU……