Adaptations to a flooding land.

[Tales]

Ok I wonder what kind of adaptations would the animals need on an environment I plan to make in a fiction. But it's rather believable as far as I can see.

The island is rather small like the offshore islands of Singapore but the whole island is in fact a very big mangrove swamp. Every time the tide rises at least 90% of the island is submerged in water. The flowering plants here are mostly mangroves and small shrubs and saltwater grasses.

[pacmansays]

Lots of amphibians and tree climbing animals, perching or sea birds too

[Tales]

err but salt water? for amphibians?

But I am rather worried that seagrasses can't sprout between in the sparse islets in this story. [

[Tales]

OK here's what I have in mind.

here's a diagram of my habitat. Each islet is of random size and has mangrove growing on it. in between there are wide spaces which are exposed at low tide and I am asking if seagrasses can grow here.

Anyone can help?