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MOOR GREEN LAKES GROUP

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Bird Migration Statistics

Birds are capable of travelling considerable distances. Many of the birds seen at Moor Green Lakes spend either just the winter, or summer with us. Others pass through in the spring and autumn as they migrate between their summer breeding locations in the north, and wintering locations south of us. The sight of arrivals and departures marks the passage of the seasons and adds to the fascination of a visit to the Reserve.

 

The following information summarise the annual arrival and departure dates recorded in the MGLG Annual Reports produced since 1993. This information is supplemented with informal data (in italics) from the Monthly Bird Summaries where Annual Reports are not yet available.  Information on the locations where birds spend the rest of their time is abstracted from "The Migration Atlas" produced by the British Trust for Ornithology. This collates the results 100 years of information on birds which have been ringed and subsequently recovered. To provide meaningful statistical information, only birds that are relatively common at Moor Green are considered here.

Green Sandpiper

 

Green Sandpipers breed in the boreal forest zone of north Scandinavia and Russia; nesting in old song-bird nests and squirrel dreys. They Winter in southern Britain, SW Europe and north Africa.

 

Females often leave before the young are fledged, followed later by the juveniles and males.

 

Small numbers spend the winter at Moor Green Lakes and larger numbers pass through; August sightings are the most numerous. Unlike many waders, they do not form flocks and individuals may be found scattered around the lake margins and scrapes.

Max Leave Return Max
1993 1 09-May 17-Jul 6
1994 2 06-May 16-Jul 2
1995 2 May Jul 3
1996 1 21-Apr 18-Jun 3
1997 1 24-Apr 17-Jun 6
1998 1 26-Apr 18-Jul 8
1999 2 17-Apr 10-Jul 4
2000 3 27-Apr 13-Jul 4
2001 3 26-Apr 28-Jun 8
2002 5 26-Apr 26-Jun 3
2003 3 26-Apr 17-Jun 5
2004 2 19-Apr 20-Jun 6
2005 2 13-Apr 11-Jun 4
2006 2 21-Apr 09-Jun 15
2007 1 04-May 16-Jun 8
2008 3 24-Apr 17-Jun 13
2009 4 29-Apr 16-Jun 9
 
Earliest/Min 1 13-Apr 09-Jun 2
Average 2.2 25-Apr 26-Jun 6.3
Latest/Max 5 09-May 18-Jul 15
Juvinile Green Sandpiper,

 Juvenile Green Sandpiper, 4th August 2008 - ©  Les Thorn

Little Ringed Plover

 

This smart little plover first started to breed in Britain in 1938, and has yet to colonise Ireland. They spend the winter south of the Sahara.

 

A few pairs have been breeding at Moor Green Lakes since 1990, preferring the exposed gravel which results from the extraction process.

Arrive Max Leave
1993 20-Mar 9 29-Jul
1994 28-Mar 11 29-Aug
1995 26-Mar 7 27-Aug
1996 16-Mar 12 11-Aug
1997 08-Mar 12 02-Sep
1998 28-Mar 7 10-Sep
1999 13-Mar 8 16-Aug
2000 23-Mar 5 28-Aug
2001 - 5 30-Jul
2002 16-Mar 11 08-Jul
2003 03-Mar 9 01-Aug
2004 23-Mar 11 18-Aug
2005 24-Mar 10 16-Aug
2006 16-Mar 13 15-Aug
2007 16-Mar 11 05-Aug
2008 17-Mar 11 09-Aug
2009 13-Mar    
       
Earliest/Min 03-Mar 5 08-Jul
Average 18-Mar 9.5 13-Aug
Latest/Max 28-Mar 13 10-Sep
Adult Little Ringed Plover on Colebrook scrape

 Little Ringed Plover, 4th May 2009 - © Gary Randall

Common Sandpiper

 

This small wader passes through Moor Green Lakes on its northerly migration from sub-Saharan west Africa and southern Europe where it spends the winter. It breeds in northern Britain and Scandinavia.

 

Occasionally Common Sandpipers spend the winter in Berkshire and have also bred in the county.

 

Arrive Max Leave Return Max Leave
1993 10-Apr 5 19-May 02-Jul 4 14-Sep
1994 19-Apr 5 22-May 29-Jun 6 08-Oct
1995 02-Apr 4 18-May 01-Jul 5 30-Sep
1996 11-Apr 3 22-May 25-Jun 4 05-Oct
1997 14-Apr 6 02-Jun 16-Jul 4 17-Sep
1998 01-Apr 4 29-May 11-Jul 4 20-Sep
1999 11-Apr 2 19-May 04-Jul 3 28-Sep
2000 18-Apr 2 25-May 15-Jul 6 17-Oct
2001 16-Apr 3 28-May 30-Jun 6 08-Oct
2002 02-Apr 4 18-May 29-Jul 2 08-Sep
2003 19-Apr 9 21-May 05-Jul ? 19-Sep
2004 16-Apr 3 25-May 19-Jul 3 29-Sep
2005 13-Apr 2 22-May 15-Jul 2 08-Oct
2006 09-Apr 2 24-May 08-Jul 2 15-Oct
2007 17-Apr 3 21-May 04-Jul 5 08-Sep
2008 12-Apr 3 26-May 21-Jun 7 23-Sep
2009 11-Apr 5 15-May 18-Jun    
           
Earliest/Min 01-Apr 2 04-May 18-Jun 2 08-Sep
Average 11-Apr 3.8 21-May 06-Jul 4.2 27-Sep
Latest/Max 19-Apr 9 02-Jun 29-Jul 7 17-Oct
Common Sandpiper on Colebrook scrape

  Common Sandpiper, 23 April 2009 - © David Lowther

Common Tern

 

Common Terns have been breeding at Moor Green Lakes since 1991, not always successfully.

 

British breeding Common Terns winter on the west coast of Africa. Occasionally, birds from further north pass through on migration; these are separately noted where possible. 

Arrive Young Leave Passage
1993 12-Apr 10 23-Jul  
1994 22-Apr 13 21-Sep 22-Oct
1995 13-Apr 2 15-Aug  
1996 13-Apr 4 28-Aug  
1997 13-Apr 0 18-Aug  
1998 20-Apr 1 09-Aug 10-Sep
1999 19-Apr 2 09-Sep  
2000 19-Apr 14 15-Aug 20-Sep
2001 14-Apr 18 12-Aug 18-Sep
2002 14-Apr 16 27-Jul  
2003 26-Mar 30 11-Aug  
2004 02-Apr 23 21-Aug  
2005 24-Mar 25 19-Aug  
2006 30-Mar 0 08-Aug  
2007 11-Apr 0 20-Aug  
2008 14-Apr 3 29-Aug  
2009 10-Apr 0    
       
Earliest/Min 24-Mar 0 23-Jul  
Average 10-Apr 9.5 17-Aug  
Latest/Max 22-Apr 30 21-Sep  

Common Tern

Common Tern, 26 April 2009 - © Gary Randall

Redshank

 

Small numbers of Redshank arrive at Moor Green Lakes to breed, but they are never very successful. They nest on the ground, usually in a tuft of Soft Rush (Juncus sp.). The eggs or young are readily predated by Crows and Foxes. The birds breeding at Moor Green Lakes probably winter on the Channel coasts, and possibly as far as Spain.

 

Redshank on passage can drop in on Moor Green Lakes and have been recorded in all months except November. These are most likely to be Redshanks of the Icelandic breeding race which winter around the British coasts in substantial numbers. 

 

 

Arrive Max Leave
1993 07-Mar 8 26-Jun
1994 23-Feb 8 23-Jul
1995 26-Feb 6 23-Jul
1996 28-Feb 6 10-Jul
1997 08-Mar 6 09-Aug
1998 07-Mar 6 24-Jul
1999 17-Mar 4 26-Jun
2000 11-Mar 4 19-May
2001 24-Mar 4 23-Apr
2002 12-Mar 4 07-Jul
2003 12-Mar 4 07-Jul
2004 13-Mar 6 26-Jul
2005 20-Mar 7 27-Jun
2006 21-Mar 6 08-Jul
2007 12-Mar 8 18-Jul
2008 07-Mar 8 25-Jul
2009 06-Mar 8 20-Jun
     
Earliest/Min 23-Feb 4 23-Apr
Average 10-Mar 6.1 04-Jul
Latest/Max 24-Mar 8 09-Aug
Redshank mating on the scrape in front of Colebrook Hide

Redshank mating, 16 April 2009 - © Jerry O'Brien

Goosander

 

Ever since the late 1980's, Grove Lake has been a Goosander winter roosting site of regional importance. They feed mainly on fish, which are abundant in the local lakes and rivers, and gather to socialise before roosting.

 

Goosanders in the UK are at the west of their range which extends throughout Scandinavia and northern Russia to the Bering Sea. "Our" birds breed in northern England, Scotland and  Scandinavia. The males spend much of June to October in the fjords of northern Norway where they undergo their moult. The females remain on the breeding grounds with the young until they move south to the wintering sites such as Moor Green Lakes and are reunited with the males.

 

*Exceptionally, in 1996 2 females remained until 18th May and one until 20 June.

Winter Arrive Max Leave
1993/94 20-Nov 79 -
1994/95 - 49 -
1995/96 - 124 15-Apr*
1996/97 15-Nov 184 12-Apr
1997/98 17-Nov 87 28-Mar
1998/99 17-Nov 79 27-Mar
1999/00 16-Nov 72 07-Apr
2000/01 16-Nov 47 15-Apr
2001/02 17-Nov 55 24-Mar
2002/03 07-Nov 29 30-Mar
2003/04 12-Nov 31 29-Mar
2004/05 13-Nov 48 19-Mar
2005/06 19-Nov 37 09-Apr
2006/07 07-Nov 30 17-Apr
2007/08 29-Oct 46 04-Apr
2008/09 01-Nov 67 11-Apr
2009/10      
     
Earliest/Min 29-Oct 29 19-Mar
Average 12-Nov 66.5 04-Apr
Latest/Max 20-Nov 184 17-Apr
Goosanders socialising before roosting

 

 

 

 

 

 

 

 

 

 

Goosanders at roost, 29 January 2009 - © David Cary

     


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