Quiz 2 Flashcards
selection can lead to
adaptations
selection pressures can come from the … (… factors) or … (… factors)
environment; abiotic; interactions with other organisms; biotic
…: a characteristic that enhances the survival or reproduction of organisms that bear it
adaptation
…: the lifetime pattern of growth, maturation and reproduction that is characteristic of a population or species
life history
mayflies live a maximum of a … a day
few hours
elephants have a gestation period of
2 yrs
differences in life history are due to … organisms have limited resources, and they allocate their resources based on … (abiotic, biotic)
tradeoffs; selection pressures
…: explains phenotypes (behavior and physical attributes) through the lens of life history changing through selection
life history theory
life history theory: Darwinian demon
hypothetical organism that has … with respect to life history: would reproduce directly after …, produce … offspring, and live …
maximum fitness; birth; infinite; indefinitely
bears are a … type strategist
k
K-selection often ... body size (...) ... life expectancy ... offspring, ... in life substantial ...
large; investment
longer
fewer; later
parental care
r-selection: typically ... body size ... life expectancy high ..., ... little to no ... high ...
smaller short fecundity; early parental care dispersal
key components of life history: ... .. ... ...
maintenance
growth
storage
reproduction
growth =
body size
reproduction =
… of offspring
… of reproduction
…
number; age; parental care
for plants, … (how much energy is being invested in creating seeds) is part of parental care
seed construction
higher risk of mortality = … reproduction, … offspring
lower risk of mortality = … reproduction, … offspring
faster; more
slower; fewer
maintenance =
life span
storage = …/..
usually tied to how … resources are in the environment
fat; starch; reliable
a predator is a … for life history
selection pressure
organisms evolve in response to the … in which they live
ecosystem
ecosystem: … (environment) + … (community)
abiotic; biotic
community: all populations of .. that interact within the same area
different species
population:
all individuals of a species living in the
same area
there are millions of species on the planet, but only a … of these species are found in any one location
subset
ecological filtering: ... ... local ... conditions local .. conditions ...
climate landscape abiotic biotic dispersal
..: movement of individuals to new locations
dispersal
the … determines which species are present in a location
ecosystem
interactions determine the … (… component) of an ecosystem
community; biotic
an ecological interaction is the effect that a pair of organisms living together in a community …
types of interactions are defined based on the .. of the interaction for both species
have on each other; outcome
mutualism: …/…
competition: …/…
predation: ../…
parasitism: …/..
herbivory: …/…
commensalism: …/…
\+/+ -/- \+/- \+/- \+/- \+/0
competition, predation, parasitism, herbivory are … interactions where at least one participant loses
antagonistic
competition- limited …
…: within the same species
…: between different species
resources
intraspecific
interspecific
competition can be …
asymmetric
two major types of competition:
… competition: use up the resource first
… competition: prevent others from accessing the resource
exploitation
interference
..: multidimensional habitat that allows a species to practice its way of life
niche
..: a species entire potential niche
fundamental niche
…: the portion of the fundamental niche that a species actually occupies
realized niche
niche is determined by … and … factors
biotic; abiotic
…: when one species prevents another from occupying a particular habitat
competitive exclusion
… via …: when competing species each utilize different parts of the niche
coexistence; niche differentiation
… (aka …): when competing species divide up the available niche space
niche differentiation; niche partitioning
…: one species benefits while the other species is unaffected
commensalism
..: both species benefit
mutualism
types of mutualistic benefits:
…/…- provide energy and/or nutrition to another organism
… - provides a home for or protection/defense of another organism, can include pest control
… - provides transport of the organism or its gametes (e.g. dispersal or pollination)
energetic; nutritional
protective
transport
…: change of a biological species triggered by the change of another species
two (or more) species … affect each other’s evolution –> can occur at the species or the population level
coevolution; reciprocally
coevolution can occur as a result of an … but not all of these are coevolutionary
interaction between species
coevolution requires … –> both species must impact each other
reciprocity
…: required mutualism
…: nice but not necessary
obligate; facultative
… - … as many microbe cells as human cells
10x-1x
some of the microbes for humans are … (meaning no harm to host), or …, many …
commensal; parasitic; mutualistic
hundreds of genera of microbes, about … or more species in the gut alone
1000
decreases in the diversity of our … might be responsible for some health problems in humans
microfauna
coevolution: predatory and prey
…
arms race
how predator/prey and parasite/host interactions differ:
parasites don’t always …
parasites live .. or …
kill their hosts
in or on hosts
…: the complete range of species, genetic variation within species and ecosystems
biodiversity
biological species concept:
Mayr (1940): species are groups of actually or potentially … natural populations that are … from other such groups
interbreeding; reproductively isolated
biological species concept: great for using in a ... framework can be hard to apply to: ... organisms ... organisms ...
theoretical;
asexual
extinct
hybrids
… species concept:
individuals that look alike are the same species
useful when in the field, or you have limited other info
morphological species
… = same species, different phenotypes
polymorphism
… dimorphism
sexual
morphological species concept: can be hard to apply to .. ... ... species ...
polymorphisms
life stages
cryptic
mimics
… species concept: definition of species based on morphological differences known only from the fossil record
paleontological
… species concept:
same niche, same species
ecological
… species concept (evSC)
common ancestry and common fate
evolutionary
… species concept:
the smallest diagnosable monophyletic group of populations within which there is a parental pattern of ancestry and descent
phylogenetic
are species real?
no one definition has satisfied all …; yet they all know vaguely what they mean when they speak of a species
naturalists
steps of allopatric speciation in order: single group of ... individuals ... separation = decrease in ... genetic ... reproductive ... = formation of ..
interbreeding
geographic; gene flow
divergence
isolation; 2 new species
reproduction isolation is considered equivalent to formation o 2 species based on the
biological species concept
allopatric: different place
population splits either by … or …
population diverges genetically over time
vicariance; dispersal
…: gene flow reduces variation between two species
homogenization
speciation:
a single interbreeding population is split into 2 populations
the two populations diverge … bc different mutations occur and become fixed in each population over time. intermittently, we take individuals from each population and test them to see whether they can still …
… may be different in each population
speciation occurs when the two populations are no longer able to produce .., … offspring
.. acts differentially on each population
genetically; interbreed
selection pressures
viable; fertile
genetic drift
(speciation) reproductive isolation:
…: preventing fertilization
…: preventing viable (capable of reproducing) offspring
prezygotic; postzygotic
reproductive isolation is not geographic separation
reproductive isolation: unable to … (produce fertile, viable offspring) even if in the same location
geographic separation: physical separation (a barrier, a great distance)
successfully breed
reproductive isolation: pre-zygotic barriers … (e.g. mating behaviors) .. (e.g. parts don't fit together) … (e.g. egg and sperm don't fuse) … (e.g. time of day, time of yr) … (e.g. niches)
behavior mechanical gametic temporal ecological
reproductive isolation
post-zygotic barriers:
… (e.g. ploidy- different number of chromosomes, infertility of offspring)
offspring not … (offspring don’t survive or survive a much lower rate)
genetic incompatibility
viable
reproductive barriers can allow for further …
genetic divergence
geographic separation = decrease in …
gene flow
geographic separation prevents gene flow through:
…
…
physical barrier
distance
genetic divergence:
…
…
…
mutation
selection
genetic drift