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2014 ; 68
(10
): 2804-20
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The changing pace of insular life: 5000 years of microevolution in the Orkney
vole (Microtus arvalis orcadensis)
#MMPMID24957579
Cucchi T
; Barnett R
; Martínková N
; Renaud S
; Renvoisé E
; Evin A
; Sheridan A
; Mainland I
; Wickham-Jones C
; Tougard C
; Quéré JP
; Pascal M
; Pascal M
; Heckel G
; O'Higgins P
; Searle JB
; Dobney KM
Evolution
2014[Oct]; 68
(10
): 2804-20
PMID24957579
show ga
Island evolution may be expected to involve fast initial morphological divergence
followed by stasis. We tested this model using the dental phenotype of modern and
ancient common voles (Microtus arvalis), introduced onto the Orkney archipelago
(Scotland) from continental Europe some 5000 years ago. First, we investigated
phenotypic divergence of Orkney and continental European populations and assessed
climatic influences. Second, phenotypic differentiation among Orkney populations
was tested against geography, time, and neutral genetic patterns. Finally, we
examined evolutionary change along a time series for the Orkney Mainland. Molar
gigantism and anterior-lobe hypertrophy evolved rapidly in Orkney voles following
introduction, without any transitional forms detected. Founder events and
adaptation appear to explain this initial rapid evolution. Idiosyncrasy in dental
features among different island populations of Orkney voles is also likely the
result of local founder events following Neolithic translocation around the
archipelago. However, against our initial expectations, a second marked
phenotypic shift occurred between the 4th and 12th centuries AD, associated with
increased pastoral farming and introduction of competitors (mice and rats) and
terrestrial predators (foxes and cats). These results indicate that human agency
can generate a more complex pattern of morphological evolution than might be
expected in island rodents.