BIOL 230 Lecture Notes - Lecture 3: Ecological Niche, Chthamalus, Lythrum Salicaria
Document Summary
Depends on type of community and dispersal abilities of taxa considered. Unfortunately, on how researchers construct local-regional richness plots. Easy to get artifactual relationships by using too large an area for local richness or not accurately measuring region richness. Dispersal limitation can also be assessed through species invasions. Introduce exotic species -> leads to net increase in local diversity (ex. Can lead to replacement of native species by exotic species. Therefore, no net change in species number (ex. Sometimes, leads to dramatic declines in species richness/ native species (purple loosestrife, gorse) **ma(cid:374)uall(cid:455) put a seed that did(cid:374)"t origi(cid:374)all(cid:455) o(cid:272)(cid:272)ur, if it flourishes the(cid:374) it just (cid:272)ould(cid:374)"t origi(cid:374)all(cid:455) gro(cid:449) (cid:271)e(cid:272)ause it (cid:272)ould(cid:374)"t get there. **if you plant it and it still does(cid:374)"t gro(cid:449), the(cid:374) (cid:455)ou k(cid:374)o(cid:449) there are competition/species interactions interfering with growth/dispersal. Meta-analysis = combines results of multiple scientific studies. Effect size = species richness when seeds added species richness when no seeds added (scaled by variance)
