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2017 ; 284
(1859
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Global decline of bumblebees is phylogenetically structured and inversely related
to species range size and pathogen incidence
#MMPMID28724728
Arbetman MP
; Gleiser G
; Morales CL
; Williams P
; Aizen MA
Proc Biol Sci
2017[Jul]; 284
(1859
): ä PMID28724728
show ga
Conservation biology can profit greatly from incorporating a phylogenetic
perspective into analyses of patterns and drivers of species extinction risk. We
applied such an approach to analyse patterns of bumblebee (Bombus) decline. We
assembled a database representing approximately 43% of the circa 260 globally
known species, which included species extinction risk assessments following the
International Union fo Conservation of Nature Red List categories and criteria,
and information on species traits presumably associated with bumblebee decline.
We quantified the strength of phylogenetic signal in decline, range size, tongue
length and parasite presence. Overall, about one-third of the assessed bumblebees
are declining and declining species are not randomly distributed across the
Bombus phylogeny. Susceptible species were over-represented in the subgenus
Thoracobombus (approx. 64%) and under-represented in the subgenus Pyrobombus
(approx. 6%). Phylogenetic logistic regressions revealed that species with small
geographical ranges and those in which none of three internal parasites were
reported (i.e. Crithidia bombi, Nosema spp. or Locustacarus buchneri) were
particularly vulnerable. Bumblebee evolutionary history will be deeply eroded if
most species from threatened clades, particularly those stemming from basal
nodes, become finally extinct. The habitat of species with restricted
distribution should be protected and the importance of pathogen
tolerance/resistance as mechanisms to deal with pathogens needs urgent research.