Ecology Flashcards
What is a habitat?
The place where an organism lives
What is a population
All the organisms of one species living in a habitat
What is a community?
The populations of different species living in a habitat
What are abiotic factors?
Non-living factors of the environment
What are biotic factors?
Living factors of the environment
What is an ecosystem?
The interaction of a community of living organisms with the non-living parts of their environment
What do plants compete for?
Light, space, water and mineral ions
What do animals compete for?
Space (territory), food, water and mates
What is interdependence?
Where in a community, each species depend on each other for things like food, shelter, pollination and seed dispersal
What is a stable community?
Where in a community, all the species and environmental factors are in balance so that the population sizes are roughly constant
List examples of abiotic factors
Moisture level, light intensity, temperature, carbon dioxide level, wind intensity or direction, oxygen level, soil pH and mineral content
How changes to the environment affect a community?
These can affect the sizes of a population in a community, meaning they can affect the population sizes of other organisms that depend on them; this has knock-on effects because of interdependence
List examples of biotic factors
New predators, competition (one species may outcompete another so that numbers are too low to breed), new pathogens and availability of food
What are the three types of adaptations?
Structural, behavioural and functional
What is a structural adaptation (give an example)?
Features of an organisms’ body structure like shape and colour e.g. arctic foxes have white fur which allows them to be camouflaged in the snow
What is a behavioural adaptation?
The way that an organism behaves - many species migrate to warmer climates during the winter to avoid the problems of living in a cold condition
What is a functional adaptation (give an example)?
Things that go on inside an organism’s body that can be related to processes like reproduction and metabolism e.g. when brown bears hibernate over winter, they lower their metabolism to conserve energy
What is an extremophile?
Microorganisms that are adapted to live in very extreme conditions, such as high temperatures, high salt concentrations and high pressures
What is a producer?
Always at the start of a food chain, make their own energy with photosynthesis, normally green plants or algae
What is biomass?
The mass of living materials with biological molecules
Give an example of a food chain
Producer –> primary consumer –> secondary consumer
e.g. 5000 dandelions –> 100 rabbits –> 1 fox
How do populations of predators and prey go in cycles?
If the number of prey increase, so will the number of predators but as the number of predators increase, the number of prey will decrease
How can you study the distribution of an organism?
You can measure how common an organism is in two sample areas by using quadrats and them compare them or you can study how the distribution changes across an area by placing quadrats along a transect
How do you estimate the percentage cover of a quadrat?
Especially for a smaller organism, it can be hard to count them individually, so instead count the number of little squares covered by the organism in order to get an estimate
How can a change in the availability of water affect distribution of organisms?
The distribution of some animal and plant species in the tropics changes between the wet and the dry seasons, such as the times of year when there is more or less rainfall
How can a change in temperature affect the distribution of organisms?
E.g. distribution of bird species in Germany is changing because of a rise in average temperature
How can a change in atmospheric gases affect the distribution of organisms?
The distribution of some species change in areas where there is more air pollution e.g. some species of lichen can’t grow in areas where sulfur dioxide is given out by industrial processes