Lecture 19 Flashcards
What are the 2 things environment can be?
- abiotic (physical)
- biotic (other organisms)
explain an abiotic environment
- physical and chemical features
ex. temp, moisture, light, wind, soil and water chemistry, pH
explain a biotic environment
- living organisms including competitors, parasites, predators/prey, mutualists
- individuals of the same and different species
what are the different types of ecologies?
organismal ecology - interactions with their (a)biotic environment
population ecology - factors that effect pop size and fluctuations and compositions (age classes, male:female ratios : variation in space
community ecology - interactions among diff species (predators and scavengers, food chains and food webs
ecosystem ecology - energy flow and nutrient cycling through an ecosystem (primary producers to consumers to decomposers and back to producers
how does dead salmon help the ecosystem?
- fertilize forest soil, trees, and water
how does climate change stuff in environment
- large bodies of water like oceans moderate the climate of adjacent land
- mountains affect rainfall patterns
What is the Wallace Line
- the boundary he identified that separates the Oriental from Australian animal realms
What is the def of population biology?
- a group of individuals of one species living in a defined area
- individuals in a pop use common resources, cope with similar environmental facots and interact with each other
What are the 6 pop characteristics
range: geographic area where species occurs
dispersion: pattern of spacing between individuals
Size: number of individuals
density: number of individuals - per unit area
age structure: number of individuals of different ages
sex ratio: ratio of males to females
What is the mark-recapture sampling?
- can be used to estimate the pop of mobile animals
ex. deer mice on burnaby mountain
What does fecundity mean?
- number of offspring produced per female *older has more
