[CT Birds] Red-tailed Hawks and Red-shouldered Hawks, Part II

Stephen Broker ls.broker at cox.net
Mon Jan 19 11:34:08 EST 2015


When I group count circle results for three recognized geographic regions of the state, western uplands, central valley lowlands, and eastern uplands, the hawk ratios are quite different.  The western uplands, also including the western coastal plain, have 9 count circles (LS, LH, BA, PA, WR, OX, GS, WE, SM) with a Red-tail/Red-shoulder ratio of 17.2 (11,973/697).  The central valley lowlands (HA, QV, NH) have a ratio of 21.1 (7,908/375).  The eastern uplands and eastern coastal plain (ST, EW, SR, OL, NL, NA) have a ratio of 4.2 (3,856/917).  CBC data indicate a strong statewide clinal increase in Red-shouldered Hawks from west to east.  Isolating the two northeasternmost CBCs, Storrs and Edwin Way Teale, Trail Wood, one gets a ratio of 5.9 (1,210/204), which still favors the view that Red-shouldered Hawk is far more prevalent here than elsewhere in the state.  Mark, I never doubt your powers of observation.

Taking each count circle individually, the CBCs with highest relative representation of Red-shouldered Hawks are:  Old Lyme-Saybrook (ratio of 3.1), Napatree (3.3), Salmon River (4.0), New London (4.4), Oxford (5.0), Storrs (5.2), and Trail Wood (7.1).  Oxford is the one CBC in western Connecticut where one can hope to see Red-shouldered Hawk in relative abundance (163 R-s H, highest total in western CT, 814 R-t H, one of the lowest totals in this region).  Hartford skews the central valley numbers by producing good numbers of Red-shouldered Hawks but very big numbers of Red-tailed Hawks.  To be continued.

Steve Broker

Cheshire

 





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