what to conserve? conservation units (lecture 2) Flashcards Preview

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Flashcards in what to conserve? conservation units (lecture 2) Deck (28)
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1
Q

Why select conservation units?

A
  • essential for effective and efficient planning given limited resources
  • the aim is to protect biodiversity
  • biodiversity = variability among living organisms: within species/between species/ecosystems
  • have to select from these units
2
Q

What is yearly required versus actual spend on conservation?

  • James et al., 2001
  • McCarthy et al., 2012
A
  • James et al: required $27.5B, actual $6B (20%)

- McCarthy et al: required $78B, currently at 10% of this

3
Q

What units of conservation do taxonomic and ecosystems approaches encompass?

A

Taxonomic:

  • genetic diversity
  • populations
  • sub-species
  • species

Ecosystems:

  • habitats
  • ecosystem services
4
Q

Why use genetic diversity as a conservation unit?

A
  • important for population resilience (small population paradigm)
  • in plants may be useful for improving yields in closely related crop species
  • varies spatially
5
Q

What are problems with genetic diversity as a conservation unit?

A
  • focus on genetic diversity or genetic uniqueness?
  • is it practical?
  • are there more practical surrogates for genetic diversity?
6
Q

Why use populations as a conservation unit?

A

Multiple populations = higher probability of:

  • maximising genetic diversity
  • protecting local adaptations
  • insurance against local disasters
7
Q

What are problems with populations as a conservation unit?

A
  • while some distributions are obvious others are less clear
  • is each isolated distribution a distinct population?
  • populations can be difficult to define
  • based on rarely tested assumptions of genetic divergence between populations
  • often there are multiple populations, rarely pragmatic to save them all
  • focus on local concerns instead of global priorities
  • can lead to narrow outlooks and inefficient conservation
8
Q

Example of the problems with populations as a conservation unit:

  • great cranes project
A
  • common cranes extinct in UK circa 1600
  • cranes recolonised ~ 1980
  • 2009 great cranes project started
  • £400,000 per year on trying to increase UK common crane population
    BUT
  • common crane populations in Europe have seen large increases since the 1990s
  • common cranes are “least concern”
  • 11 other crane species globally threatened with extinction
  • e,g, siberian crane is critically endangered, black-necked crane is vulnerable, neither is getting enough spent on them
9
Q

Why use subspecies as a conservation unit?

A
  • surrogate for genetic diversity

- idea that conserving a species genetic diversity is more likely if you conserve all its subspecies

10
Q

What are problems with subspecies as a conservation unit?

A
  • subspecies doesn’t mean genetic distinctiveness
  • Zink (2004) 97% continentally distributed avian species lack genetic distinctiveness
  • subspecies based conservation problematic bc
    a) incorrectly assumes subspecies always represent genetic variation
    b) promotes parochial conservation
11
Q

Example of the problems with subspecies as a conservation unit:

  • dusky seaside sparrow
A
  • subspecies restricted to florida
  • $2.5 million investment
  • declared extinct 1990
  • another non-threatened subspecies was genetically identical
12
Q

Why use species as a conservation unit?

A
  • traditional conservation unit
  • species are irreplaceable
  • pragmatic:
    • public understand it
    • unit at which biological data is most frequently
      gathered
    • relatively easy to recognise & define (legally
      important)
13
Q

What are problems with species as a conservation unit?

  • unstable taxonomy: shearwaters, inflation
A

Shearwaters:

  • 2 species were split in the early 1990s
  • manx shearwater = least concern
  • balearic shearwater = critically endangered, declining 7.4% a year, will be extinct in 40 years

Taxonomic inflation/progress?:

  • albatross: now 21 species, used to be 13
  • lemurs: 33sp in 1994, 70 in 2006, now about a hundred
  • Philippines may have more than 100 more avian endemics than currently defined
14
Q

What are problems with species as a conservation unit?

A
  • unstable taxonomy
  • most species not described
  • especially true for non-charismatic species
15
Q

Why use habitats as a conservation unit?

A
  • response to accusations that species based conservation ignores many species
  • pragmatic:
    • reasonably good data on habitat loss
    • protecting habitats gives a good chance of
      protecting species that live there
    • habitat loss is a major driver of extinction risk
    • 80% of terrestrial vertebrates threatened with
      habitat loss
  • protect ecosystem services e.g. watershed management relying on intact forest (utilitarian approach)
16
Q

What are problems with habitats as a conservation unit?

A
  • broad-scale habitat definitions (e.g. forest type) and loss are pretty easy to define but it is more difficult at finer scales
  • some species have such small ranges that broad habitat conservation won’t do it
17
Q

What are ecosystem services?

A
  • benefits of ecosystems to human wellbeing

- humans are buffered by technology/culture but ultimately rely on ecosystem services

18
Q

What are supporting ecosystem services?

A
  • necessary for production of other ecosystem services
  • e.g. primary production, nutrient cycling, soil formation
  • often excluded from economic evaluations to prevent double counting
19
Q

What are provisioning ecosystem services?

A
  • resources obtained from ecosystems

- e.g. wood, fibre, food, freshwater

20
Q

What are regulating ecosystem services?

A
  • benefits obtained from the regulation of ecosystem processes
  • e.g. climate regulation, flood regulation, disease regulation, water purification
21
Q

What are cultural ecosystem services?

A
  • non-material benefits to human wellbeing

- e.g. aesthetic, mental well-being, recreational activities like fishing and ecotourism

22
Q

Provisioning ecosystem services:

  • pollination
  • productivity
A

Pollination:

  • $27B dollars a year globally
  • (Klein et al., 2007)

Productivity:

  • debate as to whether it increases with plant species richness or if only a few really contribute
  • when various conditions accounted for however most species enhance service provision in one or more scearios
23
Q

Regulating ecosystem services:

  • flood defence
A
  • super-cyclone, India Orissa 1999

- mangrove forests significantly reduced death in villages less than 10km from the coast (Das and Vincent, 2009)

24
Q

Cultural ecosystem services:

  • well-being
A
  • children in high-rise flats have better concentration levels when views of green spaces are availability (Taylor et al., 2002)
  • people in parks with more plant species have higher mental wellbeing scores (Fuller et al., 2007)
25
Q

Why use an ecosystem services approach to conservation?

A
  • provides financial incentive for conservation

BUT

26
Q

What are problems with ecosystem services as a conservation approach?

  • ecosystem disservices
A
  • ecosystem disservices: e.g. mosquitos carrying malaria in africa cost $12B USD in healthcare, lost work days, tourism, investment
27
Q

What are problems with ecosystem services as a conservation approach?

  • lack of data
A
  • lack of data: only 4 services have been mapped (Naidoo, 2008) using inadequate proxies
  • where there is data shows lack of congruence between biodiversity and ecosystem service provision except in few win-win areas
28
Q

What are problems with ecosystem services as a conservation approach?

  • biodiversity ignored
A
  • biodiversity ignored:
  • limited info on relationship b/w biodiversity and ecosystem services
  • some may be be more reliant on biomass than biodiversity
  • cultural services may be more reliant on perceived than actual biodiversity
  • service provision can be largely dependent on number of people