Iyanden supplies a specific fictional example of a fleet whose strength rests on the population of its home habitat. It is described as a populous Craftworld with a large fleet that remained substantial even after Prince Yriel took part of it away. A Tyranid attack then leaves the Craftworld close to a ghost society, dependent on wraith constructs and unable to replace its population readily. Surviving ships cannot restore the people who built and crewed the force. The comparison with planet-bound societies emphasizes their larger resource base for recovery.
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Iyanden and the population behind a fictional fleet
Warhammer 40,000's Iyanden illustrates how a fleet can lose its supporting population even when substantial naval assets survive.