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……