Field Notes Journal

Seasonal Analysis and Species Classification

Herring Gull

Model Family : Resident detectability

Herring Gull (Larus argentatus), Marazion, UK
Herring Gull (Larus argentatus), Marazion, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Herring Gull (Larus argentatus), Pembrokeshire, UK
Herring Gull (Larus argentatus), Pembrokeshire, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Herring Gull (Larus argentatus), Pembrokeshire, UK
Herring Gull (Larus argentatus), Pembrokeshire, UK David Walker, Field Notes Journal ( CC BY 4.0 )

Summary

Herring Gull

Resident with summer detectability collapse

Herring Gull 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 weak baseline presence, weak spring carry-over, strong pre-summer retention, moderate summer suppression, and moderate summer decay acceleration.

Confidence
Medium
Fit score
0.217
Peak detectability
April
Lowest detectability
September

Seasonal wheel

Seasonal wheel for Herring Gull Herring Gull Peak: April

Calendar strip

Jan 0.09
Feb 0.11
Mar 0.32
Apr 0.52
May 0.26
Jun 0.11
Jul 0.09
Aug 0.03
Sep 0.0
Oct 0.0
Nov 0.06
Dec 0.17

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
0.517
Target trough value
0.0
Target mean value
0.146
Target amplitude
0.517
Baseline to peak ratio
0.091
Autumn to winter weight ratio
0.063
Year end to winter weight ratio
0.327
Decay to growth ratio
1.333

Observed and Simulated Seasonal Patterns

Herring Gull Observed Presence, Thrupp Lake
Herring Gull Observed Presence, Thrupp Lake
Herring Gull Observed Totals, Thrupp Lake
Herring Gull Observed Totals, Thrupp Lake
Herring Gull Simulated Presence, Thrupp Lake
Herring Gull 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. Herring Gull. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.26. https://fieldnotesjournal.uk/wildlife/seasonal/thrupp_lake/herring_gull.html

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

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