We took a car ferry to Dauphin Island which sits at the mouth of Mobile Bay, and then drove west to Pelican Point beach for a (hot) walk in the late morning sun. The beaches along the gulf coast of this part of Alabama are composed of finely ground, minuscule particles of quartz that originated in the Appalachian mountains, were ground down by erosion and river action before being transported to the gulf, where minerals were further reduced in size by wave action over tens of thousands of years. The result is an eye-blinding, fine, white sand that actually squeaks as you walk over it.
It’s hard to decide which is whiter — the sand or the puffy cumulus clouds. Little islands of sea oats grasses and herbaceous perennials help stabilize the dunes. But this is harsh habitat for these plants that have few mineral nutrients and precious little fresh water resources and must deal with a lot of salt water spray.
Farther away from the ocean, more perennial grasses can establish mats of vegetation.
In salt water pools behind the beach, one might find a few shorebirds foraging for food. We were surprised to find a tiny Least Sandpiper poking around in the vegetation at the water’s edge.
Even farther away from the ocean, the vegetation is much thicker and more diverse with all kinds of perennial grasses and forbs growing on the sandy matrix. I surprised a Great Blue Heron and Black-bellied Plover as I came around the corner of this small pond.
A flock of Red-winged Blackbirds (all females and immature males) were feasting on the sea oats.
The Dauphin Island fishing pier ends far short of the ocean now, due to sand buildup between Pelican Point (which used to be an island) and Dauphin Island.
Looking toward the interior of Dauphin Island, you can see the successive ridges of white sand dunes deposited over time, and colonization first by grasses, then various species of shrubs, and finally dense stands of pines and oaks, the species best adapted to growing in dry, sandy conditions.
In the interior of the island, you can find huge, old live oak trees, covered with mosses and epiphytes, and surrounded by saw palmetto and a variety of flowering plants. These are impressive giants, both in their size and in their survival in a climate of intense heat, periodic drought, and occasional hurricane landfall.
Alabama’s gulf shores are an ecological wonder!
Posted in beach, Behavior, Birds, Landscape, Ocean shore, Plants, Wetlands, Wildlife Photography |
Tagged Dauphin Island, least sandpiper, live oak, sea oats |