bio iq final prep - (habitat loss to infectious disease)

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50 Terms

1
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what is habitat?

  • the range of environmental conditions (biotic and abiotic) that a species needs

  • unique to each species

  • not a geographic location

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inhospitable matrix

where the fragments live

  • area that is not suitable for a specific species

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habitat loss comes in many forms

  • clear cutting

  • agriculture

  • housing

  • roads

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fragmentation has

  • has genetic impacts (inbreeding and the ability to adapt)

  • ecological impacts (a reordering of the whole community)

  • can alter processes (how nutrients flow through the system)

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how does habitat loss and/or fragmentation lead to changes in genetic diversity and why does it matter?

  1. genetic diversity is good for individuals

  2. genetic diversity is required for adaptive evolution—-especially important in an era of rapid climate change

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traits of a population that maintains genetic diversity

  1. large population size

    • mutations occur

    • drift is minimized

  2. even sex ratios

  3. random mating

    • avoids inbreeding, inbreeding depression (ID)

  4. migration between populations

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three factors that drive population decline

  1. environmental stochasticity

  2. demographic stochasticity

  3. genetic stochasticity

stochasticity = variation that can’t be predicted

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extinction vortex

population numbers dip —> small, slow increase —> population numbers dip again and tend to stay that way for longer

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species-area relationship (SAR)

S = C x Az

S = number of species

C = constant, equal to the number of species in the smallest sampling unit (y-intercept)

A = area

Z = rate at which new species accumulate (slope)

log(S) = log(C) + zlog(A)

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why are some species much more sensitive to fragmentation than others

depends on their size, mobility, how skittish they are, their boldness and shyness

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oceanic islands

not nested because of randomness and competitiveness and vulnerability to extinction, colonization and survival

  • never attached to mainland

  • only species there are those that made their way across an ocean by themselves

  • species with great dispersal abilities

  • islands are species-poor: few mammals and few top predators (mesopredators become apex predators)

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land bridge island

  • once attached to mainland, become separated slowly

  • contain more species per unit area than oceanic island of same size

  • have species that could never have made it to the island on their own

  • nested

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habitat islands

  • created by habitat destruction

  • exist in a matrix of inhospitable habitat

  • non-nested because of random extinction

  • more similar to oceanic islands

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faunal relaxation

it takes a while for species to be lost once a land bridge or habitat fragmentation forms…what you see immediately is not good indication of the long-term outcome

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extinction debt

species ‘committed to extinction’ owing to habitat loss and reduced population size but not yet extinct

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richness

total number of species

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not all species are equally vulnerable to extinction following habitat loss

we lose a specific subset of species first

  1. species that require large areas

  2. those species also tend to have large, community-wide effects (apex predators and mega-herbivores)

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trophic cascade

indirect effect of one species on another that is at least one trophic level removed

  • example: predators are eating herbivores which minimizes the animals eating the plants—the plant’s predators

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SLOSS

a single large reserve or a several small reserves

  • which is better depends on species area curve

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several small advantages

are less nested

  • they are better protected from external factors (ex: wildfires and diseases)

  • higher density

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single large advantages

  • more species (large) to protect

  • may better protect species with large home ranges

  • less edge effect

  • more connectivity

  • larger population less prone to extinction/decline

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edge effect

the changes in population or community structure that occur at the boundary between two different habitats

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native species

a species that occurs where it evolved in situ

  • still a native species even if it once required colonizing a distant location—as long as they did it without the help of people

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exotic species

a species that has been moved by people—intentionally or unintentionally—to a region where it did not evolve

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invasive species

a subset of exotic species that have large ecological or economic impacts

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invasions

the human-mediated redistribution of species to areas where they do not naturally occur/did not evolve/they did not colonize without human assistance

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exotic species vs. invasive species

exotic species: have little/no ecological impact

invasive species:

  • spread on their own into wildlands

  • establish large, self-sustaining populations

  • directly displace native species (competition or predation) or indirectly by altering ecological interactions (disrupt mutualisms)

  • and/or alter ecosystem processes

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invaders can be ant taxa

  • plants

  • diseases

  • invertebrates

  • vertebrates: mammals, fish, reptiles

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biological invasions

  • intense competition with native places

  • alteration of the aquatic environment so that it is unsuitable for native species

  • impacts pollinators—parasitoids and herbivores

  • disrupts a highly coevolved mutualism between a plant and its pollinator/seed disperser

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what is the biggest way for invaders to cause ecological impacts

by altering disturbance regimes

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disturbance regime

any natural, external event that removes established plants very quickly

  • examples: fire and floods

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why are invasions different than naturally-occurring colonization events?

  1. rate of colonization, abundance upon arrival

  2. identity/trophic role of the colonist

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consequences of invasions

  • homogenizing flora and fauna globally

  • loss of endemic species

  • created exotic communities

  • disruption of native ecosystem processes

  • lowering diversity—less diverse communities are less stable

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three requirements for every invasion

  1. propagule supply: has to be a sort of invasive species introduced

  2. characteristics of the invader: needs to be well-suited to the local conditions

  3. community invasibility: susceptible to invasion

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diversity-invasibility relationship

more diverse communities should be less susceptible to invasions compared to less diverse communities

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how can diversity promote invasions

  • native species can also assist invasive species

  • the more diverse the community is, the more likely it is to contain a species that can act mutualistically with the invader

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biotic resistance

the ability of communities to resist exotic invasions

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disturbance

removal of established plant biomass

  • examples: fire, flood, hurricanes, drought, volcanic eruptions

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resilience

how quickly did they recover

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resistance to disturbance

plant community is altered very little by levels of disturbance

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resilience following disturbance

the community return to its pre-disturbance composition quickly following disturbance

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diseases

  • primary cause of large mammal die-offs

  • affect community structure much like apex predators and trophic cascade

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when do you expect strong effects of diseases

  • social, congregating animals

  • dense populations

    • examples: dominant plants, coral

    • allow infected individuals to come into contact with susceptible ones

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extirpations

the extinction of a population of a species

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novel disease

virus that hasn't been found in humans in the past

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novel diseases and more severe outbreaks of native diseases

  • greatly reduce the sizes of their host populations

  • have cascading effects on other species in the community even when the disease attacks a single host species

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major driver in infectious diseases in humans

habitat fragmentation/encroachment and bushmeat trade

  • examples: COVID-19 and HIV

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some clear patterns are emerging

  • increasing the number of pathogen generations per season

  • expanding the geographic range of the disease

  • increasing or decreasing transmission rates (depending on changes in host density)—direct effect of climate change

  • changing susceptibility of host

  • exposing some hosts to novel pathogens

    • example: COVID-19

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healthy carriers

have the disease without any of the symptoms

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what does cloud cover do to nighttime temps? daytime temps?

cloudy days = days get cooler

  • cloudy nights make nights warmer…the earth is radiating heat out and the clouds act as a blanket keeping it in