Wondering what I am talking about? Welcome to the world of professional cleaners. They are nothing but the crabs that inhabit the broken bridge region. Working like soldiers day and night, they ensure that the place is clean, just because they love dirt. These organisms are known as Detrivores, meaning detritus feeders (dead organic matter).

One fine Sunday evening, I was clearing the plastics near the baby mangroves and to my surprise, I saw a “Red hermit crab” running across. When I closely examined the crab, I found that it was wearing a gastropod shell. Hermit crabs fight for gastropod shells which they consider as their home. Bingo! Next I saw the ever waving crabs, known as Fiddler crab. These fellows are very interesting and they are more commonly found in estuarine environments. They have their own burrows; they keep waving their claws every now and then. One might think they are retards because they keep inviting you to their burrows without even considering your size, it seems like that. There is also miniature Mud crab or Mangrove crab, which live in this ecosystem. No harm in playing with them when are small but once they grow, they become huge. If handled improperly, they can deliver a deadly bite with their claws. Mud crabs can grow up to the size of a tender coconut (Scylla serrata)

I was delighted to learn about the interactions. It is hard to believe that animals are surviving in these regions where pollution shows its real face. As a marine biology student I have been trained to assess a given ecosystem simply by looking at the flora and fauna and the interactions between them. This looks promising. If we keep cleaning the place to facilitate the growth of the mangroves, not only are the mangroves benefitted, but also these little creatures. We are not only reclaiming a lost ecosystem but also making it sustainable for the years to come.

Links

· Mud crab – http://en.wikipedia.org/wiki/Scylla_serrata

· Fiddler crab – http://www.fiddlercrab.info/

· Gastropods – http://en.wikipedia.org/wiki/Gastropod_shell

A hermit crab

Fiddler CrabFiddler crab

Mud CrabMud crab

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Rahul, ROB

Editor’s Note – Rahul is a student of Marine Studies at MCC, doing his masters. He’s also our local expert on all things aquatic.

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