Acorn Survey Summary: 2025-2026

Survey Tree Species Summary

Species 2025 2026 Total Trees % of Trees
Bur oak (Q. macrocarpa) 3 2 5 1.4%
Northern pin oak (Q. ellipsoidalis) 0 2 2 0.6%
Red oak (Q. rubus) 161 181 342 97.7%
White oak (Q. alba) 0 1 1 0.3%

Survey Locations Map

Survey Tree Diameters and Acorn Counts

Qualitative Acorn Abundance Index

Field Qualitative Rating Scale (0–4):

Local and Regional Acorn Abundance Indices

Survey Year N Trees Local Index MN Index WI Index WV Index NC Index
2025 164 1.24 ± 0.12 0.65 ± 0.11 1.13 ± 0.14 0.65 ± 0.11 2.39 ± 0.33
2026 186 2.72 ± 0.14 1.92 ± 0.12 2.79 ± 0.16 1.92 ± 0.12 6.34 ± 0.37
  • Local Index (2025-2026): (Count + 15.2)/30.04 | Scale 0–4
  • MN Index (Noyce and Garshelis 1997): (Count + 0.87)/35.08 | Scale 0–4
  • WI Index (Kluge et al. 2022): (Count + 8.28)/26.78 | Scale 0–3
  • WV Index (Ryan et al. 2004): (Count + 0.87)/35.08 | Scale 0–2
  • NC Index (Greenburg and Warburton 2007): (Count + 5.10)/11.28 | Scale 0–4

Local and Regional Models