ecology conditions and recourses Flashcards
conditions
physicochemical features of the environment
recourses
environmental energy & materials
ultimate explanations (past) wat de verspreiding van soorten effect
- klimaat schommelingen
- zeespiegel schommelingen
- continental drifting
- refuge theory
proximate explanations (present) wat de verspreiding van soorten effect
- regen patronen
-> de catchment
area
-> rivier en bodem
soort - habitat type
refuge theory
isolated taxa in refuges during climatic fluctuations
Response curve
the performance of a species to the intensity of an environmental condition
3 types of response curve
- lethal both extremes
- lethal high extreme
- Required low con-centration
kenmerken planten met een geen tolerantie tegen zonlicht (pioneers)
- Small seed size
- Many seeds
- High juvenile mortality
- Rapid tree growth
- Pale, low density wood
- Short-lived, thin, light– - - - weight leaves
- High photo-synthetic rate
- Strongly associated with disturbance
kenmerken planten met een tolerantie tegen zonlicht
- Large seed size
- Few seeds
- Low juvenile mortality
- Slow tree growth
- Dark, high density wood
(hardwood) - Long-lived, thick heavy– — weight leaves
- Low photo-synthetic rate
- Associated with climax stability
populatie groeien niet voor altijd doordat =
1) unfavourable environmental conditions
2) competition for resources (density dependence)
hoe kan intraspecifieke competitie effect hebben op populaties?
- increased mortality
- decreased reproduction
- territories
Factors that favour tree cover expansion
- tree seedling growth rates
species intrinsic morphological & physiological traits - resource availability
- Environmental factors
factors that unfavour tree cover expension
- Herbivore abundance (Africa)
- Fire occurrence (Africa)
- Extreme droughts (Australia)
