Paradigms in Conserva/on Flashcards

1
Q

Graeme Caughley defined what two

paradigms in conservation?

A

Declining population paradigm
&
Small population paradigm

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2
Q

Declining population paradigm

A

identify causes of decline.
–  prescribe solution species by species.
–  “essentially humdrum”

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3
Q

Small population paradigm

A
–  treats population “smallness”
 as cause 
of extinction. 
     *Inbreeding, alee effect,            genetic drift, 
etc. 
–  answers “trivial question” of how long 
a population will last if nothing 
happens…
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4
Q

Strengths of basic

sciences

A
– Theory oriented. 
– Perceptions on evolutionary time scale. 
– Concepts of temporal and 
spatial scales. 
– Focus on game and 
nongame species.
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5
Q

Weaknesses of basic sciences

A

–  Lacked contact with on-the-ground managers
–  Accused of being too theoretical
•  Simplified computer simulations were initial focus of much work.
•  Information transference from theory to application was often ignored.
–  Somehow ignored existence of Biological Conservation…
•  1985 Jared Diamond and Peter
Brussard suggested the need for a new Society and journal to do what
was being done with Biological
Conservation

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6
Q

Strengths – Applied Sciences

A
Perceived wisdom 
•  TWS 50 years older than SCB. 
•  TWS on-the-ground 
management experience. 
– Rooted in population biology. 
•  Historic game management focus. 
•  Historic furbearer focus. 
– Contact with wildlife managers.
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7
Q

Weaknesses - applied sciences

A

–  Long-term focus on game species issues.
•  With, K. A. 1997. The theory of Conservation Biology. Conservation
Biology:1436-1440.
–  Analysis of publications of TWS over time. Found long tradition of studying game species in North America.
•  Exceptions
–  Noted ecologists published from wildlife platforms. e.g. John Wiens as a scientist at Oregon State University

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8
Q

Conservation Biology

A
Founded and driven by academicians transferring “pure science” to “applied science.”
– Focus on biodiversity. 
– Focus on keeping 
evolutionary processes 
functioning. 
– Implied discontent with 
traditional approaches.
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9
Q

Small population

paradigm.

A

“risk of extinction inherent in low numbers”

  • Rareness alone is the cause of
    extinction.
  • Island species.
  • Zoo species.
  •  Extinction vortex…
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10
Q

Declining population

paradigm.

A

Focused on detecting,
diagnosing and halting
population decline.

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11
Q

After a population was small forces different from those acting on -?- become important.

A

large

populations

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12
Q

The development of techniques to study the

small population forces was done primarily by ?

A
basic science departments 
in North America, and in 
captive breeding 
institutions (Smithsonian 
CRC).
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13
Q

INTERNAL CAUSE =

A

Small Population Paradigm

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14
Q

If enough factors accumulate,

then a species can enter the

A

Extinction Vortex

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15
Q

If enough factors accumulate,

then a species can enter the?

A

Extinction Vortex

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16
Q

Factors of the Extinction Vortex

A

-Human impacts
– Inbreeding effects
–  Demographic fluctuation

17
Q

What happens in an Extinction Vortex?

A

Factors snowball and drive a

species to extinction quickly.

18
Q

“Minimum Viable Population”

A

Population below which extinction vortex will occur

occurs was defined as the

19
Q

Small Population Paradigm is Largely defined by what methods?

A
--Stochasticity 
–  Genetics 
–  Metapopulations 
–  MVP 
–  Effective population size Ne 
–  PVA 
– Captive breeding 
–  Decision analysis 
– Reserve design
20
Q

Small population Paradigm– Stochastic Factors

A
  • Demographic stochasticity.

* Environmental stochasticity

21
Q

Demographic stochasticity.

A

Difference in deterministic
and stochastic models?
•  Deterministic.
•  Stochastic

22
Q

Environmental

stochasticity

A

Many, many, many
publications based on
simulations….

23
Q

Small population Paradigm Heterozygosity / Genetic diversity

A
– Heterozygosity and 
fitness… 
– Genetic drift (think 
captive) 
•  Population bottlenecks 
•  Founder effects 
– Inbreeding 
•  Inbreeding depression 
•  Outbreeding depression
24
Q

What is a metapopulation?

25
metapopulation implications for conservation:
– Reserve design (SLOSS) – Landscape configuration (corridors) – Captive populations
26
Minimum Viable Population
Minimum Viable Population
27
Under the MVP threshold,
multiple factors interact to cause reduce the viability of the population.
28
Ne
Effective Population Size
29
Viability of a Population
- Probability of extinction -  Time frame -  Population size