Field Notes Journal

Seasonal Analysis and Species Classification

Greylag Goose

Model Family : Resident detectability

Greylag Goose (Anser anser), Farmoor Reservoir, UK
Greylag Goose (Anser anser), Farmoor Reservoir, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Greylag Goose (Anser anser), Farmoor Reservoir, UK
Greylag Goose (Anser anser), Farmoor Reservoir, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Greylag Goose (Anser anser), Farmoor Reservoir, UK
Greylag Goose (Anser anser), Farmoor Reservoir, UK David Walker, Field Notes Journal ( CC BY 4.0 )

Summary

Greylag Goose

Resident with summer detectability collapse

Greylag Goose is classified as resident with summer detectability collapse. The fitted resident detectability target peaks around April and reaches its lowest point around September. The model indicates moderate baseline presence, weak spring carry-over, moderate pre-summer retention, moderate summer suppression, and moderate summer decay acceleration.

Confidence
High
Fit score
0.184
Peak detectability
April
Lowest detectability
September

Seasonal wheel

Seasonal wheel for Greylag Goose Greylag Goose Peak: April

Calendar strip

Jan 0.3
Feb 0.32
Mar 0.5
Apr 0.85
May 0.68
Jun 0.35
Jul 0.3
Aug 0.25
Sep 0.15
Oct 0.16
Nov 0.25
Dec 0.43

Highlighted months indicate stronger modelled presence or detectability. A ring marks the fitted peak; a hollow mark indicates the trough where available.

Classification evidence

Target peak month
4
Target peak label
April
Target trough month
9
Target trough label
September
Target peak value
0.845
Target trough value
0.152
Target mean value
0.378
Target amplitude
0.694
Baseline to peak ratio
0.296
Autumn to winter weight ratio
0.051
Year end to winter weight ratio
0.341
Decay to growth ratio
1.496

Observed and Simulated Seasonal Patterns

Greylag Goose Observed Presence, Abingdon
Greylag Goose Observed Presence, Abingdon
Greylag Goose Observed Totals, Abingdon
Greylag Goose Observed Totals, Abingdon
Greylag Goose Simulated Presence, Abingdon
Greylag Goose Simulated Presence, Abingdon

Cite this dataset

You are welcome to reuse or reproduce this material under the terms of the Creative Commons CC BY 4.0 licence but please cite it using the reference below, include a link to the licence, and indicate if any changes were made.

Walker, David. Greylag Goose. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.26. https://fieldnotesjournal.uk/wildlife/seasonal/abingdon/greylag_goose.html

Dataset FN-WL-SEASONAL Author David Walker Publisher Field Notes Journal Version 2026.05.26

BibTeX
@dataset{fn_wl_seasonal,
  author = {Walker, David},
  title = {Greylag Goose},
  year = {2026},
  publisher = {Field Notes Journal},
  version = {2026.05.26},
  url = {https://fieldnotesjournal.uk/wildlife/seasonal/abingdon/greylag_goose.html}
}