Tunas and Lamnid Sharks

Tunas and Lamnid Sharks
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  • 2/c Colwell and 2/c Turner
  • Convergence: Shared Characteristics under similar environmental conditions
  • Tunas and Lamnid Sharks Convergence
  • Elevated levels of Ca2+-ATPase
  • 20°C warmer than water
  • Both have body densities greater than water
  • Both move faster than 15m/s for short bursts
  • Both among most active apex predators
  • Muscles 10°C warmer than water
  • Dorsal fin retracts for streamlining
  • 1. What prey supports these apex predators? 2. How are these fast speeds affected by different water temperatures
  • Understanding: Different muscle structures aid different swimming forms
  • Understanding: Ram ventilation must occur for these predators to support aerobic activity and metabolic rate
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