Rolling Harbour dug up this fact sheet on land crabs in The Bahamas. Not sure
about all of the specific details, but a good place to start regarding their basic
ecology. To me, the biggest gaps in our knowledge of their life history is the
transition from their pelagic larval stage (just like many marine fishes) to
their terrestrial life.
To my knowledge, very little is known about this transition phase. When, where, and how do they move back onto land? It is very likely this life stage serves as a critical bottleneck on population sizes (a bottleneck similar to many marine fishes). Looking at adult land crab abundance across the islands, one can infer the importance of mangrove creeks for their life history, very likely at this small juvenile stage. Islands with the greatest number/size of creeks support the largest land crab populations (Andros in particular). Within islands, land crabs are most abundant in areas of the most extensive mangrove systems (Cherokee and Little Harbour on Abaco for instance). It is not a big leap to surmise these areas support the largest adult populations because the juveniles first access the coppice via the creeks systems. Yet another reason why mangrove creek systems are an essential component of the Bahamian Islands. I would love to see more study on the role of creeks in supporting land crab populations.