Specific ecological circumstances must align before weapon arms races begin

Evidence

Specific circumstances must fall into place before weapons launch into an arms race. Appreciating these “ingredients” reveals much about the function and diversity of nature’s most extravagant weapons, including why some species have them and most others do not. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 137

Categorization

• DEFINE: Introduces the book’s core causal framework: weapon extravagance requires specific preconditions.
• XREF: connects to: Arms races inevitably stall as weapon costs neutralize reproductive benefits — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 432; Identical circumstances trigger and collapse arms races in animals and humans. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 17; Three conditions must align to trigger an animal weapons arms race. (+6 more)

Related

• Three conditions must align to trigger an animal weapons arms race. (similarity 0.94)
• Specific conditions are required before weapons escalate into an arms race (similarity 0.94)
• Weapons evolve only when reproductive benefits exceed costs (similarity 0.91)
• Identical circumstances trigger and collapse arms races in animals and humans. (similarity 0.89)
• Weapon evolution needs both competition and economically defensible resources (similarity 0.89)
• Competition for reproduction drives evolution of nature’s biggest weapons (similarity 0.89)
• Dueling plus competition and defensibility is the general rule for extreme weapons (similarity 0.88)
• Losing the ecological context of competition can make extreme weapons vanish. (similarity 0.88)
• Human and animal arms races follow parallel evolutionary dynamics (similarity 0.87)
• Arms races inevitably stall as weapon costs neutralize reproductive benefits (similarity 0.87)
• The evolutionary drivers of animal weapons also explain human weapon elaboration. (similarity 0.87)
• Balancing selection normally curbs weapon size until some lineages escape into runaway arms races (similarity 0.86)
• Markets and battlefields select among rifle designs like natural selection acts on weapons (similarity 0.86)
• Intense competition without duel structure does not drive weapon evolution. (similarity 0.86)
• Social competition environments evolve in tandem with weapons, unlike fluctuating physical environments (similarity 0.85)

Broader Connections

• Weapon evolution needs both competition and economically defensible resources #expands (0.60) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 191
• Weapons evolve only when reproductive benefits exceed costs #expands (0.55) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 199