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Zoogeography of Fishes. Patterns and processes in the distribution of fishes (i.e., what causes certain fish species to be where they are?) Global Regional Local Successively smaller sieves that determine fish distribution Predictability of fish assemblages. Global. Plate tectonics

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zoogeography of fishes
Zoogeography of Fishes
  • Patterns and processes in the distribution of fishes (i.e., what causes certain fish species to be where they are?)
    • Global
    • Regional
    • Local
  • Successively smaller sieves that determine fish distribution
  • Predictability of fish assemblages
global
Global
  • Plate tectonics
  • Rearrangement of land masses
    • sunfishes restricted to N.A. (arose following split of land masses, temperate, freshwater)
regional historic
Regional - Historic
  • Drainage Divides
    • Broad drainages isolate aquatic communities (Mississippi vs Atlantic Slope)
regional historic4
Regional - Historic
  • Drainage Divides
    • Drainage rearrangement (stream capture)
    • Populations of Mississippi R. fishes on Atlantic slope
    • Etheostoma blennioides (Potomac captured Mississippi)
regional historic5
Regional—Historic
  • Glaciation
    • Mississippi Drainage oriented N – S
      • Fish disperse south
    • Atlantic Drainage oriented E – W
    • Teays R was the major N-W flowing river
      • Ice sheets dams caused it to flow S through the small Mississippi R.
      • Melt water cut through central highlands making Mississippi R the major river
    • Ancient Teays River Valley near present-day New and Kanawha Rivers
se fish richness
SE Fish Richness
  • Tennessee River most diverse
  • Atlantic slope least diverse
  • New / Kanawha River basin “relatively diverse”

Warren et al. 1997

regional local
Regional - Local
  • Geology (regional characteristic that influences local conditions)
    • Habitat
    • Water Flow
    • Chemistry
      • Alkalinity - Hardness
      • Productivity
regional local11
Regional - Local
  • Spatial Position
    • The position of a stream segment in a stream network influences species found there (distance from a species pool).
local
Local
  • Competition / Predation
  • Water Chemistry
  • Water Flow
  • Productivity
  • Habitat
  • Gradient
  • Stream Size

Species Richness = -5.16 + 4.6 x (Basin Area) + 0.39 x (Link Order Diff)

R2 = 0.79

df = 17

p < 0.0001