##  [Satellite-detected Decreases in Caribou Lichen Cover, Cladonia (Cladina) spp., Over Eastern Canada During the Last Three Decades](/resource/satellite-detected-decreases-caribou-lichen-cover-cladonia-cladina-spp-over-eastern-canada) 

Organization

[Natural Resources Canada (NRCan)](/organization/natural-resources-canada-nrcan)

[Government of Newfoundland and Labrador](/organization/government-newfoundland-and-labrador)

[Government of Quebec](/organization/government-quebec)

 

 

Resource Type

[Peer reviewed article](/taxonomy/term/37)

 

 

Author(s)

Liming He

Wenjun Chen

Robert Fraser

Isabella Schmelzer

André Arsenault

Sylvain Leblanc

Julie Lovitt

Peter White

Sabrina Plante

Alexis Brodeur

 

 

Original Authors

Liming He

Wenjun Chen

Robert Fraser

Isabella Schmelzer

Andre Arsenault

Sylvain Leblanc

Julie Lovitt

Peter White

Sabrina Plante

Alexis Brodeur

 

 

Contacts

[Liming He](/contact/liming-he)

 

 

Resource Date:

2024

 

 

*This resource is available on an external database and may require a paid subscription to access it. It is included on the CCLM to support our goal of capturing and sharing the breadth of all available knowledge pertaining to Boreal Caribou, Wetlands, and Land Management.*

Caribou lichens, Cladonia (*Cladina*) spp., are a slow-growing, vital winter forage for caribou that are likely to be influenced by global warming. However, the large-scale response of caribou lichens to changing global climate remains unclear. Here, we derived caribou lichen cover maps for two time periods ∼30 years apart (i.e., the late 1980 s, and 2020 s) using Landsat satellite imagery for a region (0.59 million km2) in Eastern Canada that includes all or portions of several boreal caribou population ranges. We restricted our assessment to regions with at least 10% lichen cover and evaluated differences between the two time periods. Results show that since the 1980 s satellite-derived lichen cover declined in 62% of the region evaluated, remained constant in 27%, and increased in 11%. Twenty-three percent of the lichen cover decrease occurred in areas that burned after 1980, while 77% of the decrease remains unexplained, with warming-induced shrub encroachment, and caribou presence and grazing both possible causes. Caribou lichen regeneration occurs within regions burned before the 1980 s. Given that shrubification and wildfire frequency are projected to continue increasing, further monitoring of the scale and scope of ongoing changes will help to clarify future patterns. However, our results strongly suggest that the amount of caribou lichens has declined overall.