Skip to main content

Home/ Science with Spence/ Group items tagged Succession

Rss Feed Group items tagged

Filter: All | Bookmarks | Topics Simple Middle
Katie S

Primary Vs. Secondary Succession | eHow.com - 0 views

www.ehow.com/-vs_-secondary-succession.html

Primary Succession Secondary

shared by Katie S on 07 Nov 12 - No Cached
  • Ecological succession refers to the process by which ecosystems change over time. Primary succession and secondary succession are the two different types of ecological succession
    • Katie S
      Katie S on 07 Nov 12
       
      Primary and Secondary Succession are both slow processes that describe change in an ecosystem. One community of organisms are gradually replaced by other organisms as conditions change. Primary Succession starts with rock while Secondary Succession starts in a place that already had an ecosystem that was destroyed. Soil already exists in Secondary Succession.
  • Print this article DartUtils.loadGoogle160 = function() { dmjs.runInlineAd = true; $('.AdUnit160').hide(); $('.AdWrapper').addClass('no160'); }; dartAds.renderiFrameAd([{ sz: '160x600' }], 160); Meaning Primary succession is the process by which an area first changes from bare rock into a functioning ecosystem. Secondary succession is the process by which an ecosystem that has been destroyed gradually regains its former appearance and function.
  • Secondary succession can occur in the same area any number of times. Because it is defined as the first time ecological succession occurs, primary succession can only happen once to any given area.
  • ...1 more annotation...
  • Primary succession has more stages--called "seral stages"--than secondary succession. Primary succession includes seral stages where lichens and moss break rock down into soil; in areas undergoing secondary succession, soil already exists.
Lilana Bosler

Succession - 5 views

www.marietta.edu/...succession.htm

shared by Lilana Bosler on 05 Nov 12 - No Cached
  • orderly succession of communities to a climax community (biome
  • climax community
  • pioneer community
  • ...11 more annotations...
  • 1. Primary succession begins with bare rock exposed by geologic activity example sere: rock -> lichen -> moss -> grass -> shrub -> trees -> oak hickory forest
  • stages are highly productive but require large inputs of nutrients and also tend to lose nutrients
  • Biomass increases, but there is low productivity and fluctuations in biomass are common
  • Early
  • 2. Secondary succession begins on soil from which previous community has been removed (by fire, agriculture, etc.) old field succession example sere: grass -> shrub -> trees -> oak hickory forest
  • reproduce quickly, but often die young
  • their energy goes into reproduction. There are relatively few species in early seral stages
  • Climax
  • favorable environment for many species. Biomass does not fluctuate, and decomposition rates are roughly equivalent to new production. Nutrients are cycled efficiently, and rarely leave the ecosystem. Individual organisms are longer-lived, since they invest more resources in themselves and less in producing offspring.
  • stages are much more complex, with many species
  • Fire and Succession:
  • Lilana Bosler on 07 Nov 12
     
    A website that thoroughly explains the process of succession and gives examples
Katie S

Ecological Succession - YouTube - 3 views

www.youtube.com/watch

Ecological succession you tube

shared by Katie S on 05 Nov 12 - No Cached
  • Ecological Succession
    • Katie S
      Katie S on 07 Nov 12
       
      This teacher does a great job of Explaining Primary and Secondary Succession!
Abbey B

New stem cell approach for blindness successful in mice - 0 views

www.sciencedaily.com/...130107160413.htm

Current Event

shared by Abbey B on 08 Jan 13 - No Cached
  • retinitis pigmentosa, a condition in which the light-sensing cells in the retina gradually die leading to progressive blindness.
  • The study was led by Professor Robert MacLaren
  • The researchers say the approach has relevance for treating patients with
  • ...4 more annotations...
  • in the Nuffield Department of Clinical Neurosciences at the University of Oxford
  • Jan. 7, 2013
  • 'The ability to reconstruct the entire light sensitive layer of the retina using cell transplantation is the ultimate goal of the stem cell treatments for blindness we are all working towards
  • cells transplanted into the eye had re-formed a full light-detecting layer on the retina and the mice could see.
mrs. b.

A fresh look at Mount St. Helens | Earth | Science News - 0 views

www.sciencenews.org/...fresh_look_at_Mount_St._Helens

Mount Saint Helen's- succession

shared by mrs. b. on 08 Nov 12 - No Cached
  • Life returns Some researchers feared the area north of the volcano would remain a sterile moonscape for decades. But scientists studying the blast-seared zone north of the peak found vegetation on the landslide within a few years,
  • Nine years after the eruption, plants had returned to just over 10 percent of the hummocky terrain. Twenty years on, vegetation had expanded to cover about two-thirds of the deposit. Today, Frenzen says, about 80 percent of the once sterile area sports vegetation.
  • Some of the first plants to return were lupines, most of which are  perennial plants that add nitrogen to the soil.
  • ...1 more annotation...
  • Many factors have influenced the rate at which plants repopulated the landslide deposits. For example, plants with seeds carried by wind or by highly mobile creatures like birds moved into the blast zone faster.
  • mrs. b. on 08 Nov 12
     
    "Life returns Some researchers feared the area north of the volcano would remain a sterile moonscape for decades. But scientists studying the blast-seared zone north of the peak found vegetation on the landslide within a few years, "
1 - 10 of 10
Showing 20▼ items per page