ll98lects/05f98-succession.html ll98lects/05f98-succession.html

Succession Normal, gradual changes that occur in types of species that live in an area Occurs differently in different places around world

Primary Succession Lava from volcano = forms new land composed of rock Begins in a place previously without plants Starts with arrival of living things – lichens Lichens able to survive drought, extreme heat, cold, and harsh conditions to start soil building

Primary Succession Lichens = pioneer species Pioneer species = first to inhabit the area Soil forms = lichens, force of weather, erosion When lichens die, organic matter helps soil. Mosses and ferns start to grow

Lichens

Secondary Succession Fire disturbs forest Building tore down in city Succession begins in a place that already has soil and once home to wildlife Occurs rapidly Differrent pioneer species than primary succession Pg. 66 – Observing Secondary Succession

QUESTIONS What characteristics would make a seed likely to survive a fire? As succession proceeds, what changes will occur in the population of plants found on the forest floor?

Climax Communities A community of plants that is relatively stable and undisturbed New trees grow when the old trees die Species remain the same; but individual trees change

TIME Primary Succession = hundreds or thousands of years to develop into climax community Secondary Succession = century or more

Questions Compare Primary and Secondary Succession. Infer the kind of succession that will take place on an abandoned, unpaved country road.

CREATE SUCCESSION POSTER Show the stages of Succession Explain Primary Succession. Explain Secondary Succession. Explain what a climax community would be. Illustrate the stages.