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GEM3 is an NSF EPSCoR research program seeking to understand how genetic diversity and phenotypic plasticity affect species response to environmental change, shaping both population response and adaptive capacity.

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Mapping foodscapes and sagebrush morphotypes with unmanned aerial systems for multiple herbivores

Context
The amount and composition of phytochemicals in forage plants influences habitat quality for wild herbivores. However, evaluating forage quality at fine resolutions across broad spatial extents (i.e., foodscapes) is challenging. Unmanned aerial systems (UAS) provide an avenue for bridging this gap in spatial scale.

Objectives
We evaluated the potential for UAS technology to accurately predict nutritional quality of sagebrush (Artemisia spp.) across landscapes. We mapped seasonal forage quality across two sites in Idaho, USA, with different mixtures of species but similar structural morphotypes of sagebrush.

Methods
We classified the sagebrush at both study sites using structural features of shrubs with object-based image analysis and machine learning and linked this classification to field measurements of phytochemicals to interpolate a foodscape for each phytochemical with regression kriging. We compared fine-scale landscape patterns of phytochemicals between sites and seasons.

Results
Classification accuracy for morphotypes was high at both study sites (81–87%). Forage quality was highly variable both within and among sagebrush morphotypes. Coumarins were the most accurately mapped (r2 = 0.57–0.81), whereas monoterpenes were the most variable and least explained. Patches with higher crude protein were larger and more connected in summer than in winter.

Conclusions
UAS allowed for a rapid collection of imagery for mapping foodscapes based on the phytochemical composition of sagebrush at fine scales but relatively broad extents. However, results suggest that a more advanced sensor (e.g., hyperspectral camera) is needed to map mixed species of sagebrush or to directly measure forage quality.

Data and Resources

FieldValue
Modified
2022-10-06
Release Date
2021-04-16
Publisher
Identifier
0431c568-6fee-4a5e-b6ca-94441082e29f
Spatial / Geographical Coverage Area
POINT (-114.290658 43.208757)
POINT (-113.286263 44.696841)
POLYGON ((-114.35388118029 43.180082578606, -114.35388118029 44.796898450731, -113.18685740232 44.796898450731, -113.18685740232 43.180082578606))
Spatial / Geographical Coverage Location
Southern Idaho
Temporal Coverage
Saturday, June 1, 2013 - 00:00 to Tuesday, June 30, 2015 - 00:00
Language
English (United States)
License
notspecified
Author
Peter J. Olsoy, Jennifer S. Forbey, Lisa A. Shipley, Janet L. Rachlow, Brecken C. Robb, Jordan D. Nobler & Daniel H. Thornton
Contact Name
Peter Olsoy
Contact Email
Public Access Level
Public