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Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
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As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
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Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
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Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
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GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...

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Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

Linking terrestrial and marine conservation planning and threats analysis.

Heather Tallis1, Zach Ferdaña, Elizabeth Gray

  • 1Biology Department, University of Washington, Box 351800, Seattle, WA 98195, USA. htallis@stanford.edu

Conservation Biology : the Journal of the Society for Conservation Biology
|February 8, 2008
PubMed
Summary
This summary is machine-generated.

Integrating terrestrial and marine conservation planning is crucial. A novel threats assessment revealed that cross-system threats significantly alter conservation priorities and site selection for the Pacific Northwest coast.

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Area of Science:

  • Ecology
  • Conservation Science
  • Environmental Management

Background:

  • Terrestrial inputs can damage marine ecosystems, as evidenced by the Gulf of Mexico dead zone.
  • Effective marine conservation requires explicit alignment with terrestrial conservation planning to address cross-system threats.
  • Existing conservation planning often treats terrestrial and marine systems separately, potentially overlooking critical interdependencies.

Purpose of the Study:

  • To integrate conservation planning for terrestrial and marine systems using a novel threats assessment.
  • To evaluate the impact of cross-system threats on conservation priorities in the Pacific Northwest coast ecoregion.
  • To identify areas suitable for preservation or restoration through integrated terrestrial-marine management.

Main Methods:

  • Developed and applied a novel threats assessment incorporating 5 cross-system threats.
  • Utilized site-prioritization exercises for the Pacific Northwest coast ecoregion.
  • Employed 2 proxies of freshwater influence to link land-based threats to marine sites, validated with models and field data.
  • Compared conservation priorities using MARXAN (Marine And Riverine eXpertise Network Analysis) under scenarios with no threats, single-system threats, and both single- and cross-system threats.

Main Results:

  • Including cross-system threats significantly altered the conservation threat landscape.
  • A plan considering only single-system threats identified 323 sites (161,500 ha) at risk from cross-system threats.
  • The location of priority conservation sites shifted when cross-system threats were incorporated into the analysis.

Conclusions:

  • Explicitly integrated decision-making and management actions are essential for terrestrial and marine ecosystems.
  • Findings provide quantitative support for the necessity of a unified approach to conservation planning.
  • Identified key areas for preservation and restoration through integrated management strategies.