Three conditions must align to trigger an animal weapons arms race.
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 (
#corroborates, via linked claim)
Together with competition and economic defensibility, duels tip the evolutionary balance in favor of extreme weapons. This simple insight has terrific explanatory power because it provides a general rule for why particular animal species have extreme weapons, and why their close relatives may not. Like uncovering the key to an ancient encrypted cipher, we can now make sense of so much animal diversity. Specifically, we can look to the histories of groups of species to see when behaviors changed in ways that caused the arms race ingredients to fall into place. This can help explain why isolated species stand out from the rest, and it can also explain why whole groups of related species appear to enter into arms races together. Sometimes, one or more of the arms race ingredients are part of the inherited physiology of a group of species, and this can predispose them all to arms races. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 266 (
#exemplifies, via linked claim)
Categorization
- XREF: connects to: Specific conditions are required before weapons escalate into an arms race; Specific ecological circumstances must align before weapon arms races begin — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 137; Symmetrical one-on-one fights are a neglected prerequisite for weapon arms races — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 226 (+2 more)
Related
- Specific conditions are required before weapons escalate into an arms race (similarity 0.97)
- Specific ecological circumstances must align before weapon arms races begin (similarity 0.94)
- Dueling plus competition and defensibility is the general rule for extreme weapons (similarity 0.91)
- Identical circumstances trigger and collapse arms races in animals and humans. (similarity 0.89)
- Intense competition without duel structure does not drive weapon evolution. (similarity 0.88)
- Human and animal arms races follow parallel evolutionary dynamics (similarity 0.87)
- Animal and human fights both hinge on whether duels or gang-ups occur (similarity 0.87)
- Symmetrical one-on-one fights are a neglected prerequisite for weapon arms races (similarity 0.87)
- The evolutionary drivers of animal weapons also explain human weapon elaboration. (similarity 0.86)
- State arms races mirror single male-male animal contests, not evolutionary turnover (similarity 0.86)
- One-on-one duels favor weapon evolution while chaotic scrambles do not. (similarity 0.86)
- Weapon evolution needs both competition and economically defensible resources (similarity 0.86)
- The same three ingredients trigger weapon evolution across wildly divergent animal clades (similarity 0.85)
- When balancing selection fails, bigger weapons win every round and escalate the race. (similarity 0.85)
- Competition for reproduction drives evolution of nature’s biggest weapons (similarity 0.85)
Broader Connections
- Specific conditions are required before weapons escalate into an arms race
#expands(0.85) - Specific ecological circumstances must align before weapon arms races begin
#corroborates(0.80) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 137 - Symmetrical one-on-one fights are a neglected prerequisite for weapon arms races
#expands(0.75) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 226 - Dueling plus competition and defensibility is the general rule for extreme weapons
#exemplifies(0.75) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 266 - Weapon evolution needs both competition and economically defensible resources
#expands(0.70) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 191