General Ecology (1st ppt) Flashcards
Investigates the interactions among
organisms and between organisms and their environment.
Ecology
SEVEN PRINCIPLES OF ECOLOGY
- Nature knows best.
- All forms of life are equally important.
- Everything is connected to everything else.
- Everything changes.
- Everything must go somewhere.
- Ours is a finite Earth.
- Nature is beautiful and we are stewards of God’s creation.
“the comprehensive science of the relationship of the organism to the environment”
Ernst Haeckel 1866
Okologie comes from:
oikos - house
logia - study of
is the region around a
star where conditions allow life-bearing planets to exist.
Ecosphere
“scientific natural history”
Charles Elton 1927
“the study concerned with the distribution of
organisms”
Andrewarta, H.G. & Birch 1954
“the study of the structure & function of nature”
Eugene P. Odum 1963
“The scientific study of the interactions that determine the distribution and abundance of organisms”
Charles J. Krebs 1972
“an ecosystem is a sum total of living organisms, the environment and the process of interaction between the various components of the ecosystem.”
S. Mathavan
“The scientific study of the processes influencing the distribution and abundance of organisms, the interaction among organisms, and the interaction between organisms and flux of energy and matter.”
CARY INSTITUTE OF ECOSYSTEM STUDIES
“study of organisms and the
environment: the study of relationships between living organisms and their interactions with the natural or developed environment.”
ENCARTA 2009
defined as the number of entities and processes in the system under study.
complexity
DISCIPLINES OF ECOLOGY (8)
Zoology
Botany
Evolution
Genetics
Meteorology
Sociology
Geology
Microbiology
COMPONENTS OF ECOSYSTEM (5)
Issues (Depletion of fish fauna due to pollution)
Species (Channa sps, Angulla sps, riparian flora)
Activities (Dumping Industrial effluents, fishing, irrigation)
Habitat (Pools, Runs, Riffles, Cascades, Riparian zone, dams)
People (Fishermen, industies)
___ level studies focus on individuals.
Organism
___ level studies examine groups of conspecific
organisms living in a particular area.
Population
Includes all of the conditions
that affects survival and reproduction.
Environment
Factors in the environment (2)
Abiotic (nonliving)
Biotic (living)
___ level studies investigate interactions
between the populations of various species in an area.
Community
___ level studies examine how a community
interacts with the physical environment.
Ecosystem
Hierarchy of Ecology (4)
Organism Level
Population Level
Community Level
Ecosystem Level
Environmental factors that are directly utilized by an
animal are ___
Resources
Example of nonexpendable resource
Space