Also known as intertidal flats, mudflats are the stinky result of fine sediments combining with organic matter, water saturation and bacterial influence. They’re affected by the rise and fall of the tide, creating various microhabitats as they’re submerged and exposed.
Though much of this ecosystem’s activity is hidden from view, you’ve probably seen evidence of its inhabitants if you’ve ever stepped foot onto its soft and slimy surface.
The tiny holes commonly found in mudflats are likely the work of an invertebrate like the fiddler crab. This animal digs burrows along the higher intertidal zones, emerging at low tide to snack on detritus and microalgae. When the tide rises once again, it creeps back into its burrow and plugs it, sealing itself inside, safe from predators.
Great Blue Heron
Where you find fish, you’ll find birds. If you’re lucky, you’ll spot one of these majestic birds wading in the water. Their presence is a sign of life in the shallows—they’re waiting patiently to grab their next meal. Fish, insects, frogs, crabs and even mice contribute to the great blue heron’s diet.
Visitors to the Bay have a good chance of stumbling upon a discarded crab shell while combing the shoreline. There’s a reason they end up there. Blue crabs wait for the tide to rise, and then move into the mudflat’s safe, shallow waters before shedding.
To learn more about the many animals who call mudflats home, listen to this week’s A Blue View: