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Marine Ecology - MarineBiology - Lecture SlidesBiologyCentral University of Kerala57 pag.Document shared on Downloaded by: redax68071 ([email protected])
Marine EcologyDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
Ecology = the study of theinteraction of organisms withtheir environments.Docsity.comDocument shared on Downloaded by: redax68071 ([email protected])
It involves understandingbioticandabioticfactors influencingthe distribution and abundanceof living things.Docsity.comDocument shared on Downloaded by: redax68071 ([email protected])
Biotic Factors• Competitors• Disease• Predators• Food availability• Habitat availability• Symbiotic relationshipsAbiotic FactorspHTemperatureWeather conditionsWater availabilityChemical composition ofenvironmentnitrates, phosphates,ammonia, O2, pollutionDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
The word "ecology" coinedfromGreekword"oikos",which means "house" or "placeto live”.Docsity.comDocument shared on Downloaded by: redax68071 ([email protected])
population growthcompetition between speciessymbiotic relationshipstrophic (=feeding) relationshipsorigin of biological diversityinteraction with the physical environmentDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
Energy Flow & Nutrient CycleDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
Food ChainsArtificial devices toillustrate energy flowfrom one trophic levelto anotherTrophic Levels:groups of organismsthat obtain theirenergy in a similarmannerDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
Total number of levels in a food chaindepends upon locality and number ofspeciesHighest trophic levels occupied by adultanimals with no predators of their ownSecondary Production: total amount ofbiomass produced in all higher trophiclevelsFood ChainsDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
NutrientsInorganic nutrients incorporatedinto cells during photosynthesis- e.g. N, P, C, SCyclic flow in food chainsDecomposers release inorganicforms that become available toautotrophs againDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
EnergyNon-cyclic, unidirectional flowLosses at each transfer from onetrophic level to another- Losses as heat from respiration- Inefficiencies in processingTotal energy declines from one transferto another- Limits number of trophic levelsDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
Energy FlowDocsity.comDocument shared on Downloaded by: redax68071 ([email protected])
PrimaryProducerPrimaryConsumerSecondaryConsumerTertiaryConsumerFood ChainDecomposerzooplanktonlarval fishfishfungi

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Term
Winter
Professor
;jm/;ljm. ;/l
Tags
Ecology, trophic level

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