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Lagging Strand Synthesis01:59

Lagging Strand Synthesis

During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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Geographic range limits: achieving synthesis.

Kevin J Gaston1

  • 1Biodiversity and Macroecology Group, Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK. k.j.gaston@sheffield.ac.uk

Proceedings. Biological Sciences
|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Species geographic range limits are complex, with few universal determinants. Demographic changes at range edges vary, necessitating studies examining all parameters for a comprehensive understanding.

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Area of Science:

  • Ecology
  • Biogeography
  • Population Dynamics

Background:

  • Understanding species' geographic range limits is fragmented.
  • Empirical studies often lag behind theoretical advancements in this field.

Purpose of the Study:

  • To integrate diverse perspectives on range limit determinants.
  • To analyze how demographic parameters influence range boundaries using a population equation framework.

Main Methods:

  • Overview of theoretical and empirical evidence.
  • Analysis of demographic parameters (e.g., birth rates, death rates) in relation to range limits.
  • Examination of factors like environmental gradients and biotic interactions.

Main Results:

  • Demographic parameters show variable changes towards range limits.
  • No single parameter consistently predicts range limitation.
  • Range limits can form with or without hard boundaries, environmental gradients, or biotic interactions.

Conclusions:

  • Few categorical inferences can be made from studies focusing on single demographic parameters.
  • Comprehensive studies documenting variation across all demographic parameters are crucial.
  • General patterns in range limit determinants are scarce, with many exceptions.