unit B Caleigh,Victoria, anna Flashcards
What’s an ecotone?
Transition areas; contains species from bordering ecosystems
What biotic factors would you find in a muskeg?
Few soil bacteria/fungi, lichens, moss, shrubs, black flies, mosquitoes.
What is the littoral zone?
Area from a shore of a lake to where no more plants grow.
What is found in the limnetic zone?
Plankton, fish, tadpoles, birds, sunlight.
What is the profundal zone?
Region of a lake below the limnetic zone, insufficient light for photosynthesis.
What are the layers of soil?
Litter, topsoil, subsoil, bedrock.
What are the factors of biotic potential?
Birth potential, capacity for survival, breeding frequency, length of productive life.
What are limits of tolerance?
Law of minimum, law of tolerance, density independence factors, density dependent factors.
What is an oligotrophic lake?
Low nutrient levels, deep, cold, clear waters, holds dissolved gasses.
What is a eutrophic lake ?
Lakes get shallower and warmer, good supply of nutrients, very productive, marshy, oxygen depletion.
3 indicators of water quality are:
Bacteria, dissolved oxygen, biological oxygen demand
What is biological oxygen demand?
The amount of dissolved oxygen needed by decomposers to break down organic matter in water at 20 degrees over five days
What is phylogeny?
The history or evolution of a species or group of organisms (phylogenic trees used to demonstrate this)
what are the six kingdoms?
eubacteria, archaebacteria, protista, fungi, plantae, animilia.
what are the different ways of classifying organisms from general to most specific?
kingdom, phyla, class, order, family, genus, species.
what did darwin study?, where did he study?, and what did he discover?
studied finches in the galapagos islands, discovered natural selection and that some species are better adapted to survive then others.
what is radiometric dating?
a technique used to determine the age of a fossil or rock, using half lives.
what are some problems caused by cottagers?
sewage goes into the water table and runs into the lakes, becomes foamy by the shorelines because of an increase in nitrogen and phosphorus from lawns.
what is the term refering to the science of classifying organisms?
taxonomy
what does the term endemic mean?
a term used to describe a species that is found in one area.
what is a vestigial feature?
a feature that may have served as a useful function in an ancient ancestor.
who had the same theory as darwin?
Alfred Wallace
what is divergent evolution?
when a species evolves rapidly into many different species.
what are the 3 steps of allopatric speciation?
1: seperation by a physical barrier.
2: populations evolves independantly.
3: physical/behavioral differences between two groups so they can no longer breed.
