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Posts Tagged ‘food habits’

Molly Meserve is a graduate student at the University of New England.

Hello, my name is Molly Meserve and I am a graduate student at the University of New England in Biddeford, ME. Along with all of you I will be closely observing the fascinating behavior of Maine’s Great Blue Herons this summer. As a Maine native I am particularly interested in this work because the Great Blue Heron has been a constant in my life here in Maine. My master’s thesis focuses on the following question: Do prey delivery rates and total foraging times of Great Blue Herons in coastal and inland colonies differ and how may these factors affect chick survival? With the help of Danielle D’Auria and some wonderful HERON volunteers I have been able to visit a few of the Great Blue Heron colonies in the State. Two of those colonies have been chosen as the main focus of my study; the inland colony is located in Hollis, ME and the coastal colony is in Brunswick, ME. I will be out in the field from April 1st until about mid-August observing from ground blinds that I have set up in each of the sites mentioned above. While in the field I will be focusing on gathering accurate numbers of adults, chicks (their approximate ages), and nestlings along with prey delivery rates and time spent foraging for each nest observed.

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Remains found beneath heron nests. Clockwise from top left: egg shells and membranes, crayfish claw and fish backbone, fused rear vertebrae and pelvis (from 3 different aged herons), heron feathers, heron skull and mandible, leg and wing bones.

Did you know that you can learn a lot by what is on the ground at the base of a heron’s nest tree?  A heron nest is only so big, so there’s no room for food remains and other forms of heron “trash”.  Herons simply just pitch it all over the edge.  Out of sight, out of mind, I guess.  Light blue eggshells with some membranes in tact indicate a successful hatch; but you may also find remains of young herons that met their premature demise by falling to the ground.  Adult feathers that were molted are often found.  You might find out that crayfish is a favorite food of the family above.  This disposal area for the herons nesting above can really be a treasure trove to a researcher trying to find out how dam removal affects the birds that use a river.

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