Studied by 0 people
Looks like no one added any tags here yet for you.
Biosphere
An ecological system composed of living organisms, ecosystems, and populations
Species
A group of organisms that can interbreed and produce fertile offspring
How are organisms classified in name form
First name is the Genus, second name is the Species
Population
A group of organisms of the same species living in the same place at the same time, and are capable of producing living offspring
DNA full form
deoxyribbonuelic acid
What are Dichotomous keys used for
Dichotomous keys are tools used to identify organisms by answering a series of questions about observable traits that lead to the correct classification.
Abiotic factors
Non-Living factors
Examples of Abiotic factors
Temperature, pH, Light intensity, salinity, dissolved oxygen, and soil texture
Biotic factors
Living factors, i.e animals and plants
Niche
A particular role a living organism plays in an ecosystem, that includes its habitat, resource use, and interactions with other organisms.
Carrying capacity
The maximum size of of a population determined by competition for limited resoruces - i.e food or fertile soil
What is population size regulated by
Density dependent factors and negative feedback loops.
Density dependent factors
Disease, competition, and predation
Population abundance measuring methods
Randon sampling, Systematic sampling, and Transect sampling
Random sampling
Sampling method where each memeber of a population has an equal chance of being selected. Used when the area sampled is very large or there is limited time available
Systematic sampling
Where samples are taken at fixed intervals
Stratified sampling
Where strata are sampled separately from the main part of the habitat and used to take into account different areas identified
How is temperature measured
Thermometer
How is Light measured
Light meter
How is pH measured
Electronic pH meter or UI
Turbidity
Cloudiness or haziness of a fluid caused by large scattered particles that are invisible to the naked eye
What processes are dependent on temperature
Enzyme activity, and solubility of oxygen in water (inverse relationship)
What processes are dependent on light
Photosynthesis and availability of energy throughout an ecosystem
pH
Acidity interferes with ion regulation and effeciency of haemoglobin. Plants also prefer different soil pH’s
Formula for estimating population size using Lincoln index
M X N/R, where M is the number of marked organisms caught initially, N is the total number of organisms recaptured, and R is the number marked individuals recaptured
Community
Collection of interacting populations within an ecosystem,
Habitat
Location in where a community, species, or organism lives
Ecosystem
Open systems in which both energy and matter can enter and exit
Tipping points
The minimum amount of change in an ecosystem that will destabilise it, causing it to reach a new equilibrium
What do Keystone species do
Keystone species regulate the regulate an ecosystem
Planetary boundaries model
A model which presents a set of 9 plannetary boundaries within which humanity can maintain sustainable ecosystems
Biosphere integrity
The health and stability of Earth’s biological system
What is Ecological resilience
Ability of an ecosystem to return after disturbances
