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As of 1 September 2013 these pages will remain on this server as an archive, but they will not be updated.

Please visit my new site at www.ospreytrax.com

 

CONTENTS of the Osprey Pages

Intro-Overview of my Osprey research
History of Martha's Vineyard Ospreys
Satellite Tracking of Migration
   
The Technology of Tracking

Link to 2008 Migration 
Link to 2009 Migration

Link to 2010 Migration
Link to 2011 Migration
Link to 2012 Migration
Link to 2013 Migration


Other Osprey Links:
David Gessner's OspreyWorld

Blackwater National Wildlife Refuge
     Lots of great links here, nestcams included
Woods Hole, MA, Osprey cam

Mom, Dad and four fledglings crowd into the Lobsterville nest, the most productive Osprey nest on Martha's Vineyard over the past 11 years. (Photo by Cheryl Batzer.)

Introduction

    In 1969, when I began studying the birds of prey on Martha's Vineyard, there were two pairs of Ospreys on the Island. By 1992, thanks to the efforts of Gus Ben David, then director of Mass Audubon's Felix Neck Wildlife Sanctuary, and a large number of Osprey devotees working under his guidance, the population had increased to over 70 pairs. In the early to mid-90s, the Ospreys suffered a significant decline in their nesting success, but have since shown strong signs of recovery. Gus monitored the population through the '94 season. I picked up the census again in 1998 and, with the help of some graduate students and a number of Island residents, have monitored the number of breeding pairs and the number of young fledged each year. (Details)

    In 2000 I began collaborating with Mark Martell on his studies of Osprey migration. A small (and rather expensive) transmitter attached to an Osprey's back enables us to track a bird daily as it migrates. We tagged two Ospreys in 2000-2001, and since then have deployed transmitters on 31 more, mostly on Martha's Vineyard. Beginning in 2004, we have been concentrating on following young birds on their first migrations. This year (2009) will mark the end of our studies of juvenile Osprey migration and the beginning of a study of adult males' hunting behavior. (Details

   
In 2004 one of my graduate students, Jennifer Rettew, began studying the Vineyard Ospreys for her M.Sc. thesis. She is watching a series of nests to quantify and identify the fish that are being brought in by the parents. She will be looking for differences in diet and reproductive success between pairs from different parts of the Island. 
     Working with the BBC on their upcoming documentary series, "Incredible Journeys," we tagged five new birds--two adults and three young of the year. (Details)

     In 2005 Jennifer spent her second and final season watching 16 Osprey nests, focusing on the relationship between feeding rates, sibling aggression, and nesting success. She successfully defended her M.Sc. thesis in the spring of 2006.
     Spurred on by our success with tagging young birds in '04, I decided to focus all my attention on satellite tagging young birds. That year we tagged two young--one on the Vineyard and one in Rhode Island.

     In 2006 we tagged three birds in Delaware in or around Cape Henlopen State Park, one in Rhode Island, and a single bird on the Vineyard. One or the young birds tagged for the BBC, Jaws, returned to the Vineyard for the first time.

     In 2007 we tagged five birds again--two in Delaware and three on Martha's Vineyard. Jaws, from the class of '04 returned for his second trip home, and Homer, tagged near Little Homers Pond on the Vineyard, returned for the first time. This was the first year we used GPS enabled transmitters, which opened up a whole new world of research possibilities. The previous transmitters were accurate enough to follow migration, but not to follow the daily hunting movements of individual Ospreys.

     In 2008 we tagged seven young Ospreys--one in South Carolina, one in Delaware, two on Cape Cod, and three on Martha's Vineyard

     In 2009 we initiated our studies of adult hunting behavior by tagging 4 adult males--3 on the Westport River, just west of New Bedford, MA, and one on Nantucket Island. If all goes well, we will outfit 8 young with transmitters in July and August. 

     In 2010 we tagged two adults on the Westport River, one on Long Island, one in Nantucket, and one in Rhode Island. Later in the summer we tagged two young on Martha's Vineyard. 

     In 2011 we tagged an adult on Long Island and an adult on MVY. We tagged two juveniles in New Hampshire and two more on Martha's Vineyard.

     In 2012 we tagged our first cell-tower birds (two adult males on the Westport River), and adult male in NH, and one on Long Island. We tagged another two young in New Hampshire. For the first time in years, we didn't tag any birds on MVY.   

     In 2013 we had a very big year, tagging 8 juveniles (3 NH, 2 Mass North Shore, 2 MVY, and one on Long Island) and 11 adults, 7 of which with cell-tower transmitters (4 Chesapeake Bay, 2 MVY, 1 Fishers Island). We put satellite tags on 4 adult males (2 DC, 2 NH).   

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