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Biodiversity Part 2 Global Environmental Issues

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brygid
22 diapositives · 396 Views · Jul 11, 2014

Biodiversity measurement is fraught with uncertainty. Over 1.75 million species have been identified, yet estimates suggest around 30 million species exist, with approximately 40,000 becoming extinct annually. The concept of 'biodiversity' encompasses genetic diversity, species variations, and population distributions. Issues arise in assessing biodiversity units, funding for surveys, and the necessity of international cooperation. Understanding the complexities of coevolution, ecological relationships, and human impacts is vital for effective conservation strategies, particularly in biodiversity 'hot spots' facing severe threats from climate change and industrial activities.

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  1. Biodiversity part 2Global Environmental Issues

  2. How do we measure biodiversity? Uncertainty is a central problem Numbers of species 1.75 million species scientifically identified. estimated 30 million species on earth. estimated 40,000 species rendered extinct annually.

  3. what does ‘biodiverse’ mean in practice? example: different varieties of white oak versus different species of oaks versus different genera

  4. Issue 2: Distribution of populations and sampling problematic

  5. Issue 3: unit of analysis: population? gene pool? Clade? Genera? What is the appropriate unit for biodiversity analysis?

  6. Issue 4: Convention on Biodiversity: the US is supposed to measure biodiversity, but has limited funds for the US Biological Survey and HAS NOT signed the international Convention on Biological Diversity. This has been attributed to an administration unwillingness to fund a program which would almost certainly find new species that would then be subject to protection under the Endangered Species Act. It takes money to measure biodiversity: Our knowledge is dependent upon the resources we invest in assessing and cataloging biodiversity

  7. Where does Biodiversity come from? • coevolutionary relationships: mutualism, symbiosis, • allopathy • patchiness in landscape ecology

  8. Types of Biodiversity: • landscape biodiversity engenders biodiversity by increasing the complexity of niches across space • alpha biodiversity • rollover biodiversity • is there information in a landscape, and if so how structured?

  9. trails, movements of animals and plants, seed dispersals

  10. Niche complexity within a patch

  11. biodiversity hot spots: what is a biodiversity ‘hot spot’? how do types of biodiversity and processes of biodiversification create in hot spots?

  12. species loss rates • absolute loss

  13. rates of loss differ geographically across social and biological contexts MAP: Biodiversity loss: state and scenarios 2006 and 2050. greatest losses rank order: Markets First, Security First, Policy First Sustainability First. differences among the regions: broad-scale land-use changes, especially pastureland and biofuel production infrastructure development, pollution climate change, public policy and conflict http://www.unep.org/geo/geo4 / http://www.globio.info/region/world/

  14. Biodiversity Loss rates also differ by patch utilization: some areas are more amenable, systematically more amenable, to human exploitation

  15. Causes of Biodiversity Loss Proximate versus Background causes

  16. Background causes • consumption of energy and resources • increasing affluence • lack of sustainable planning or policies • population growth • Toxics, wastes, chemical utilization: • toxics, • CO2, • Erosion • Fertilizer use • Unmediated globalization • exotic species invasions • Industrial development in biodiversity hot spots

  17. How might we best graph the relation between proximate and background causes of biodiversity loss? Effect intensity?

  18. Relational view?

  19. A final concern for biodiversity: Collapse due to ecological dependency or species interrelations

  20. biodiversity hot spots: what is a biodiversity ‘hot spot’? how do types of biodiversity and processes of biodiversification create in hot spots?