Mobile resources deny weapons a cost-effective performance advantage

Evidence

Ball rollers have no such leverage. Their fights occur out in the open and over a mobile resource. Although males fight briskly with tumbling and pushing and scrambling, they cannot brace themselves into position like the tunnelers can. As a result there appears to be no leverage or other performance advantage to having large weapons and, without the performance advantage, weapons are not cost-effective. A simple change in the way these beetles hid their food resource had profound implications for the evolution of their weapons. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 225

Categorization

• XREF: Direct parallel to human warfare: mobile/vagile raiders versus fixed fortifications changing how weapons are used. — connects to: Weapon size should track resource availability more than any mandatory body part — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 338; Cheap weapons can disable the most expensive military technologies — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 417; A single technological leap can render an entire opposing arsenal obsolete — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 562 (+7 more)
• SEED: This one-variable natural experiment is a strong essay hook comparing the economic defensibility logic across beetle tunnels and human fortified positions.

Related

• Weapons evolve only when reproductive benefits exceed costs (similarity 0.84)
• Weapon size should track resource availability more than any mandatory body part (similarity 0.84)
• Natural selection usually favors modest weapon size because cost offsets benefit (similarity 0.83)
• Resource value and defensibility are relative to each species’ perspective (similarity 0.83)
• Bigger weapons usually fail because their costs outweigh their benefits (similarity 0.83)
• Weapon size in animal species is under stabilizing selection, not open-ended directional selection (similarity 0.83)
• Weapon expense is what keeps signals of fighting ability honest (similarity 0.82)
• Weapon evolution needs both competition and economically defensible resources (similarity 0.82)
• Uniformly distributed resources make territorial weapons uneconomical (similarity 0.81)
• Weapon size is favored when males defend resources females need (similarity 0.81)
• Markets and battlefields select among rifle designs like natural selection acts on weapons (similarity 0.81)
• Competition for reproduction drives evolution of nature’s biggest weapons (similarity 0.81)
• Weapons grow late because development prioritizes mandatory survival expenses first (similarity 0.81)
• Weapon costliness keeps signals honest by excluding weaker males (similarity 0.81)
• Beetle horns can be impressively large yet nearly cost-free to produce and use (similarity 0.81)

Broader Connections

• Natural selection usually favors modest weapon size because cost offsets benefit #corroborates (0.80) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 21
• Extreme weapon size faces stabilizing, not open-ended, selection in real populations #corroborates (0.60)
• Drones lower political, economic, and ethical costs of war #contradicts (0.60)
• Weapon evolution needs both competition and economically defensible resources #corroborates (0.55) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 191
• Agility constraints suppress heavy weapons in airborne insect fighters #qualifies (0.50) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 729