GHY-1012 Lecture Notes - Lecture 2: El Malpais National Monument, Climax Community, Pioneer Species
16 Aug 2016
School
Department
Course
Professor
Tuesday, March 22, 2016
Exam 2 Lecture 2
the day I missed
-Species and humans
•recent molecular evidence shows that dogs are descended from… grey wolves
•domesticated about 130,000 years ago
•key terms: oxytocin and aggression
-Communities in transition
•ecological succession
•primary succession - a community begins to develop on a site previously
unoccupied by living organisms - ex lava flow creates new land that is colonized.
the first colonists are called pioneer species (lichens, grasses)
•secondary succession- an existing community is disrupted and a new one develops
subsequently at the site
•climax community - community that develops last and remains the longest
•el malpais national monument in NM - rocky mountain jupiter
-Disturbances
•a disturbance is any force that disrupts established patterns of species diversity
and abundance (storms, fires, logging)
•disturbances tend to disrupt superior competitors the most and allows less
competitive species to persist
•most landscapes never reach a climax community
•periodic disturbances (wildfires)
•mad up of disturbance adapted species
-Biodiversity and biosphere reserves
•humans have a great impact on animals and plants and biodiversity
•species extinctions caused by pollution, loss of habitat, excessive grazing,
poaching, and collecting
!1
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Exam 2 lecture 2 the day i missed. Species and humans: recent molecular evidence shows that dogs are descended from grey wolves, domesticated about 130,000 years ago, key terms: oxytocin and aggression. Biodiversity and biosphere reserves: humans have a great impact on animals and plants and biodiversity, species extinctions caused by pollution, loss of habitat, excessive grazing, poaching, and collecting. !1: 60% of extinctions caused by learning and loss of rainforests alone (slash and burn. Tuesday, march 22, 2016 agriculture: loss of genetic diversity. Wildlife crime: most urgent threat to three of world"s most popular species - elephants, rhinos, and tigers, global value of illegal wildlife trade between . 8 and billion annually. !2: kruger national park - where most of them live and is very subject to poaching - not. Threats to biodiversity: extinction - elimination of a species, natural causes - undisturbed ecosystems - rate = 1 species per decade. humans multiply that by 1000.
