Field Notes Journal

Seasonal Analysis and Species Classification

Mallard

Model Family : Resident detectability

Mallard (Anas platyrhynchos), Abingdon, UK
Mallard (Anas platyrhynchos), Abingdon, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Mallard (Anas platyrhynchos), Abingdon, UK
Mallard (Anas platyrhynchos), Abingdon, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Mallard (Anas platyrhynchos), Abingdon, UK
Mallard (Anas platyrhynchos), Abingdon, UK David Walker, Field Notes Journal ( CC BY 4.0 )

Summary

Mallard

Resident with summer detectability collapse

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

Confidence
Medium
Fit score
0.24
Peak detectability
April
Lowest detectability
October

Seasonal wheel

Seasonal wheel for Mallard Mallard Peak: April

Calendar strip

Jan 0.12
Feb 0.18
Mar 0.42
Apr 0.54
May 0.31
Jun 0.14
Jul 0.11
Aug 0.05
Sep 0.0
Oct 0.0
Nov 0.03
Dec 0.18

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
10
Target trough label
October
Target peak value
0.537
Target trough value
0.0
Target mean value
0.173
Target amplitude
0.537
Baseline to peak ratio
0.101
Autumn to winter weight ratio
0.055
Year end to winter weight ratio
0.355
Decay to growth ratio
1.51

Observed and Simulated Seasonal Patterns

Mallard Observed Presence, Thrupp Lake
Mallard Observed Presence, Thrupp Lake
Mallard Observed Totals, Thrupp Lake
Mallard Observed Totals, Thrupp Lake
Mallard Simulated Presence, Thrupp Lake
Mallard Simulated Presence, Thrupp Lake

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. Mallard. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.26. https://fieldnotesjournal.uk/wildlife/seasonal/thrupp_lake/mallard.html

Dataset FN-WL-SEASONAL Author David Walker Publisher Field Notes Journal Version 2026.05.26
Reference: Walker, David. Mallard. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.26.

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