Date: 7/6/18 5:28 pm
From: <bertf...>
Subject: [texbirds] Re: Eurasian collared dove population crash?
I did an analysis of 8339 reports of Eurasian Collared-Dove from 1996 to 2017 seen in the central Oaks & Prairies (21 counties). It shows average count per sighting of 3. During those years it varies significantly from an average of 1.7 to 4.1 per sighting. However, if the reports are lumped in 5-year blocks, it shows increases until about 2011 and a slight drop-off thereafter.

Year Reports Count Average

1996 3 8 2.7

1997 2 7 3.5

1999 19 50 2.6

2000 11 29 2.6

2001 24 41 1.7 2.3

2002 47 127 2.7

2003 77 249 3.2

2004 59 171 2.9

2005 66 255 3.9

2006 119 316 2.7 3.0

2007 128 528 4.1

2008 241 868 3.6

2009 419 1552 3.7

2010 464 1671 3.6

2011 530 1603 3.0 3.5

2012 656 1876 2.9

2013 1029 2803 2.7

2014 1472 3903 2.7

2015 1124 3487 3.1

2016 947 2623 2.8 2.8

2017 902 2769 3.1

8339 24936 3.0



Bert Frenz

Oaks & Prairies of Texas

eBird reviewer, Central Brazos Valley

eBird reviewer, Belize

NAB subregional editor, north-east Texas

<mailto:<Bert2...> <Bert2...>

<http://www.bafrenz.com> www.bafrenz.com


 
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