Envi scie (4) Flashcards
transformed into chemical energy by a process of photosynthesis
Solar
Energy
Models of Energy Flow in the ecosystem
Single Chanel Energy flow Model
organism eats another organism in the environment. is a linear sequence
food chain
Each food chain has three main tropic levels
Producer level, Consumer level, and decomposer level.
The interconnected, interlocking pattern of food chain
Food web
amount of energy at each trophic level decreases as it moves through an ecosystem
Energy Transfers
- ecosystems tend to change over a period of time.
- transforms itself until a stable community is formed
Ecological Succession
2 types of succession
Primary, secodary
- an area where life starts from scratch. It is a process by which a new environment begins to emerge without soil
- Examples are glacial retreats and formation of new island
PRIMARY SUCCESSION
- life starts at a place after the area has lost all the life forms existing there.
- Examples are forest thinning and wildfire.
SECONDARY SUCCESSION
Clement’s theory of succession/Mechanisms of Succession (NMECRS)
NUDATION, MIGRATION, ECESIS, COMPETITITON, REACTION, STABILIZATION
Succession begins with the development of a bare site
Nudation
It refers to arrival of propagules.
Migration
It involves establishment and initial growth of vegetation.
Ecesis
As vegetation became well established, grew, and spread, various species began to compete for space, light and nutrients. This phase is called competition.
Competition
