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Related Concept Videos

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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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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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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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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African rainforests: past, present and future.

Yadvinder Malhi1, Stephen Adu-Bredu, Rebecca A Asare

  • 1Environmental Change Institute, School of Geography and the Environment, University of Oxford, UK. yadvinder.malhi@ouce.ox.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|July 24, 2013
PubMed
Summary
This summary is machine-generated.

African rainforests face complex challenges from climate change and human activities like logging and hunting. Maintaining these vital ecosystems requires understanding their unique ecological and historical context.

Keywords:
Africaclimate changedeforestationhuntingloggingtropical rainforest

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Area of Science:

  • Ecology
  • Environmental Science
  • Conservation Biology

Background:

  • African rainforests are ecologically significant biomes characterized by unique climate and human interactions.
  • These forests have a dynamic history of expansion and retreat influenced by climate variations.
  • They exhibit low plant diversity but high tree biomass, with historically high animal biomass now under severe hunting pressure.

Purpose of the Study:

  • To synthesize current knowledge on the past and present state of African rainforests.
  • To explore challenges and opportunities for the future viability of these biomes.
  • To analyze the impact of human activities and economic factors on rainforest dynamics.

Main Methods:

  • Review of existing literature and synthesis of new analyses from a dedicated Royal Society B issue.
  • Analysis of ecological, climatic, and human interaction factors.
  • Examination of direct human pressures such as selective logging, small-scale farming, and bushmeat hunting.

Main Results:

  • African rainforests are shaped by climate variability, historical forest dynamics, and long-term human interaction.
  • Key pressures include selective logging, small-scale farming, and bushmeat hunting, leading to declining animal biomass.
  • Central African rainforests show lower deforestation rates due to mineral and oil-driven economies.

Conclusions:

  • The future of African rainforests depends on understanding their unique combination of ecological, climatic, and human factors.
  • Addressing selective logging, bushmeat hunting, and considering economic influences is crucial for conservation.
  • Proactive strategies are needed to ensure the long-term viability of these critical ecosystems.