Saturday, 31 December 2022

2022 - A patch review

 So 2022 draws to a close marking the 19th year that I have collected weekly data on my patch. One more year and I can do a deep dive analysis on the data and develop a 20-year report. Even with 20 years of data some of the patterns that are beginning to emerge are so scant that maybe another 20 years of data will be needed!

I can sum up the year thus:

44 - the number of recording visits

42.7 - the total number of recording observation hours

57 - bird species

13 - butterfly species

11 - dragonfly species

4 - mammal species

1 - reptile species

August -  the hottest month

December - the coldest month

February - the windiest month

Winners and Losers

This year populations of Chiffchaff, Jay, Skylark, and Nuthatch all increased. The Marsh Tits returned this year after last being seen in 2012. Sedge Warblers bred once again this year for the second year in a row and winter flocks of teal have increased. 

The following graphs show abundance over the past 19 years indexed to 2004 at 100.


Those species declining are notably the three common tit species and the Little Grebe has not been recorded since 2020.



Of the 61 species recorded this year and last 5 were not recorded this year with only 4 new species recorded. 

Between 2021 and 2022 40% of species increased by more than 10%, 42% declined by more than 10% and 18% remained stable.

This is a very brief and cursory examination of the data, more is sure to follow although that may take some time. Tomorrow I will collect the memory cards from my trail cams and complete another year of that data collection, an annual update will follow once they have been analsyed.


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