TY  - JOUR
A1  - Kehlmaier, Christian
A1  - Barlow, Axel
A1  - Hastings, Alexander K.
A1  - Vamberger, Melita
A1  - Paijmans, Johanna L. A.
A1  - Steadman, David W.
A1  - Albury, Nancy A.
A1  - Franz, Richard
A1  - Hofreiter, Michael
A1  - Fritz, Uwe
T1  - Tropical ancient DNA reveals relationships of the extinct bahamian giant tortoise Chelonoidis alburyorum
JF  - Proceedings of the Royal Society of London : Series B, Biological sciences
N2  - Ancient DNA of extinct species from the Pleistocene and Holocene has provided valuable evolutionary insights. However, these are largely restricted to mammals and high latitudes because DNA preservation in warm climates is typically poor. In the tropics and subtropics, non-avian reptiles constitute a significant part of the fauna and little is known about the genetics of the many extinct reptiles from tropical islands. We have reconstructed the near-complete mitochondrial genome of an extinct giant tortoise from the Bahamas (Chelonoidis alburyorum) using an approximately 1000-year-old humerus from a water-filled sinkhole (blue hole) on Great Abaco Island. Phylogenetic and molecular clock analyses place this extinct species as closely related to Galapagos (C. niger complex) and Chaco tortoises (C. chilensis), and provide evidence for repeated overseas dispersal in this tortoise group. The ancestors of extant Chelonoidis species arrived in South America from Africa only after the opening of the Atlantic Ocean and dispersed from there to the Caribbean and the Galapagos Islands. Our results also suggest that the anoxic, thermally buffered environment of blue holes may enhance DNA preservation, and thus are opening a window for better understanding evolution and population history of extinct tropical species, which would likely still exist without human impact.
KW  - Bahamas
KW  - biogeography
KW  - extinction
KW  - palaeontology
KW  - phylogeny
Y1  - 2017
U6  - https://doi.org/10.1098/rspb.2016.2235
SN  - 0962-8452
SN  - 1471-2954
VL  - 284
PB  - The Royal Society
CY  - London
ER  - 
TY  - JOUR
A1  - González-Fortes, Gloria M.
A1  - Kolbe, Ben
A1  - Fernandes, Daniel
A1  - Meleg, Ioana N.
A1  - Garcia-Vazquez, Ana
A1  - Pinto-Llona, Ana C.
A1  - Constantin, Silviu
A1  - de Torres, Trino J.
A1  - Ortiz, Jose E.
A1  - Frischauf, Christine
A1  - Rabeder, Gernot
A1  - Hofreiter, Michael
A1  - Barlow, Axel
T1  - Ancient DNA reveals differences in behaviour and sociality between brown bears and extinct cave bears
JF  - Molecular ecology
N2  - Ancient DNA studies have revolutionized the study of extinct species and populations, providing insights on phylogeny, phylogeography, admixture and demographic history. However, inferences on behaviour and sociality have been far less frequent. Here, we investigate the complete mitochondrial genomes of extinct Late Pleistocene cave bears and middle Holocene brown bears that each inhabited multiple geographically proximate caves in northern Spain. In cave bears, we find that, although most caves were occupied simultaneously, each cave almost exclusively contains a unique lineage of closely related haplotypes. This remarkable pattern suggests extreme fidelity to their birth site in cave bears, best described as homing behaviour, and that cave bears formed stable maternal social groups at least for hibernation. In contrast, brown bears do not show any strong association of mitochondrial lineage and cave, suggesting that these two closely related species differed in aspects of their behaviour and sociality. This difference is likely to have contributed to cave bear extinction, which occurred at a time in which competition for caves between bears and humans was likely intense and the ability to rapidly colonize new hibernation sites would have been crucial for the survival of a species so dependent on caves for hibernation as cave bears. Our study demonstrates the potential of ancient DNA to uncover patterns of behaviour and sociality in ancient species and populations, even those that went extinct many tens of thousands of years ago.
KW  - ancient DNA
KW  - extinction
KW  - homing
KW  - sociality
KW  - Ursus arctos
KW  - Ursus spelaeus
Y1  - 2016
U6  - https://doi.org/10.1111/mec.13800
SN  - 0962-1083
SN  - 1365-294X
VL  - 25
SP  - 4907
EP  - 4918
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -