succession exam Qs Flashcards
how to analyse a graph on succession
succession occurs, large decrease as __ (whichever natural disaster) occurred, the pioneer species (lichens / moss) grows first then low growing plants next, increasing the number of plants, the seeds of pre existing species pants germinated
how could further changes of an area lead to the development of a climax community
there will be taller plants, as the soil has become deeper, the taller plants outcompete the lower growing plants, they are the co-dominant species in the climax community
succession
change in communities / species over a period of time
describe how a part of an island may have appeared 5 years before a natural disaster
5 years before there are more algae / lichens / mosses as these are similar organisms, less organisms present as recently colonised area
describe how a part of an island may have appeared 5 years after a natural disaster
more organisms present because they no longer had to become established, more shrubs present as there higher organisms
how do birds increase the number of species of plants
birds bought the seeds with them, bird droppings, adding more organic matter therefore supporting growth of different plants
comment on the changes in the abundance of three species over 200 years (on a graph)
succession has occurred, ___ were the first species to colonise, slowest abundance was ___, interspecific competition occurs between the three species which is an example of resources competed for
what happened to bare rock to allow growth of trees
the bare rock was colonised by pioneer species which break up the rock, dead plants add organic matter as they decompose
explain how lupin plants able to grow in the early stages of glacial retreat
the soil may lack nitrates at the early stages of glacial retreat, however lupine plants can use ammonium ions produced by the bacteria therefore they can synthesise amino acids
