Modeling the impacts of two bark beetle species under a warming climate in the southwestern USA: Ecological and economic consequences.
Predicted climate warming is expected to have profound effects on bark beetle population dynamics in the southwestern United States. Temperature-mediated effects may include increases in developmental rates, generations per year, and changes in habitat suitability. As a result, the impacts of Dendroctonus frontalis and Dendroctonus mexicanus on forest resources are likely subject to amplification. To assess the implications of such change, we evaluated the generations per year of these species under three climate scenarios using a degree-day development model. We also assessed economic impacts of increased beetle outbreaks in terms of the costs of application of preventative silvicultural treatments and potential economic revenues forgone. Across the southwestern USA, the potential number of beetle generations per year ranged from 1-3+ under historical climate, an increase of 2-4+ under the minimal warming scenario and 3-5+ under the greatest warming scenario. Economic benefits of applying basal area reduction treatments to reduce forest susceptibility to beetle outbreaks ranged from $7.75/ha (NM) to $95.69/ha (AZ) under historical conditions, and $47.96/ha (NM) to $174.58/ha (AZ) under simulated severe drought conditions. Basal area reduction treatments that reduce forest susceptibility to beetle outbreak result in higher net present values than no action scenarios. Coupled with other deleterious consequences associated with beetle outbreaks, such as increased wildfires, the results suggest that forest thinning treatments play a useful role in a period of climate warming.
Waring
Kristen M
KM
Northern Arizona University, Flagstaff, 86011, USA. Kristen.waring@nau.edu
Reboletti
Danielle M
DM
Mork
Lauren A
LA
Huang
Ching-Hsun
CH
Hofstetter
Richard W
RW
Garcia
Amanda M
AM
Fulé
Peter Z
PZ
Davis
T Seth
TS
D000818:Animals; D001517:Coleoptera / Q000254:growth & development*; D016468:Forestry / Q000191:economics*; D017752:Greenhouse Effect; D007300:Insect Control; D008962:Models, Theoretical; D011157:Population Dynamics; D014481:United States
Tree Physiol. 1998 Jun;18(6):375-381
12651362
Ecol Appl. 2007 Dec;17(8):2145-51
18213958
Proc Natl Acad Sci U S A. 2005 Oct 18;102(42):15144-8
16217022
Proc Natl Acad Sci U S A. 2005 Nov 29;102(48):17384-7
16293686
Ecol Appl. 2007 Apr;17(3):882-99
17494404
Science. 2007 May 25;316(5828):1181-4
17412920
Environ Entomol. 2008 Feb;37(1):57-69
18348797
Annu Rev Entomol. 1997;42:179-206
15012312
Oecologia. 2006 Apr;147(4):679-91
16323015
Environ Entomol. 2008 Feb;37(1):94-109
18348801
Sci Total Environ. 2000 Nov 15;262(3):263-86
11087032
Insect Biochem Mol Biol. 2003 Aug;33(8):773-88
12878224
J Theor Biol. 2007 Mar 7;245(1):59-65
17087974
Environ Entomol. 2008 Jun;37(3):650-9
18559170
Conserv Biol. 2006 Apr;20(2):375-84
16903098
Nature. 2002 Mar 28;416(6879):389-95
11919621