Colonization from divergent ancestors: glaciation signatures on contemporary patterns of genomic variation in Collared Pikas (Ochotona collaris)

Identifying the genetic structure of a species and the factors that drive it is an important first step in modern population management, in part because populations evolving from separate ancestral sources may possess potentially different characteristics. This is especially true for climate‐sensitive species such as pikas, where the delimitation of distinct genetic units and the characterization of population responses to contemporary and historical environmental pressures are of particular interest. We combined a restriction site‐associated DNA sequencing (RADSeq) data set containing 4156 single nucleotide polymorphisms with ecological niche models (ENMs) of present and past habitat suitability to characterize population composition and evaluate the effects of historical range shifts, contemporary climates and landscape factors on gene flow in Collared Pikas, which are found in Alaska and adjacent regions of northwestern Canada and are the lesser‐studied of North America's two pika species. The results suggest that contemporary environmental factors contribute little to current population connectivity. Instead, genetic diversity is strongly shaped by the presence of three ancestral lineages isolated during the Pleistocene (~148 and 52 kya). Based on ENMs and genetic data, populations originating from a northern refugium experienced longer‐term stability, whereas both southern lineages underwent population expansion – contradicting the southern stability and northern expansion patterns seen in many other taxa. Current populations are comparable with respect to generally low diversity within populations and little‐to‐no recent admixture. The predominance of divergent histories structuring populations implies that if we are to understand and manage pika populations, we must specifically assess and accurately account for the forces underlying genetic similarity.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/112236/1/mec13270.pd

Robust Inference of Monocot Deep Phylogeny Using an Expanded Multigene Plastid Data Set

We use multiple photosynthetic, chlororespiratory, and plastid translation apparatus loci and their associated noncoding regions (ca. 16 kb per taxon, prior to alignment) to make strongly supported inferences of the deep internal branches of monocot phylogeny. Most monocot relationships are robust (an average of ca. 91 % bootstrap support per branch examined), including those poorly supported or unresolved in other studies. Our data strongly support a sister-group relationship between Asparagales and the commelinid monocots, the inclusion of the orchids in Asparagales, and the status of Petrosaviaceae as the sister group of all monocots except Acorus and Alismatales. The latter finding supports recognition of the order Petrosaviales. Also strongly supported is a placement of Petermannia disjunct from Colchicaceae (Liliales) and a sister-group relationship between Commelinales and Zingiberales. We highlight the remaining weak areas of monocot phylogeny, including the positions of Dioscoreales, Liliales, and Pandanales. Despite substantial variation in the overall rate of molecular evolution among lineages, inferred amounts of change among codon-position data partitions are correlated with each other across the monocot tree, consistent with low incongruence between these partitions. Ceratophyllum and Chloranthaceae appear to have a destabilizing effect on the position of the monocots among other angiosperms; the issue of monocot placement in broader angiosperm phylogeny remains problematic

Characterization of temperature‐sensitive mutants reveals a role for receptor‐like kinase SCRAMBLED/STRUBBELIG in coordinating cell proliferation and differentiation during Arabidopsis leaf development

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94480/1/tpj5109.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/94480/2/tpj5109_sm_FigS1-S8-TableS1.pd

Phylogenomic inference <i>in extremis</i>:A case study with mycoheterotroph plastomes

publishersversionPeer reviewe

streptanthifolia

Packera streptanthifolia (Greene) W.A. Weber & Á. LöveRocky Mountain groundselPackera streptanthifolia2 O'Clock Creek CampgroundSoft, mossy soil, shady areaPackera cana, Fragaria virginiana, Taraxacum officinale, Pinus contorta, Juniperus sp.very abundantMost plants flowerin

plattensis

Packera plattensis (Nuttall) W.A. Weber & Á. Löveprairie groundsel;Platte River groundsel;prairie ragwort;plains butterweed;Platte groundsel;Platte ragwortséneçon de la rivière PlattePackera plattensis2.4 km on county road 81East facing hillsideYucca glauca, Allium sp., Sisyrinchium sp.Not much to be found. Only about 10 plants observed

cana

Packera cana (Hooker) W.A. Weber & Á. Lövewoolly groundsel;silvery groundsel;silvery ragwortséneçon blanchâtrePackera canaHavre, Fresno Reservoir, east side of road from boat launch near damnortheast-facing hillside, dry eroded grasslandJuniperus horizontalis, Hymenoxis acaulis, Townsendia hookeriiuncommo

cana

Packera cana (Hooker) W.A. Weber & Á. Lövewoolly groundsel;silvery groundsel;silvery ragwortséneçon blanchâtrePackera canaUpper Souris Wildlife Refuge.Very dry steep slope.Viola nuttelii, Euphorbia esula, Oxytropis sp., Allium spp.Somewhat abundant

cana

Packera cana (Hooker) W.A. Weber & Á. Lövewoolly groundsel;silvery groundsel;silvery ragwortséneçon blanchâtrePackera canaHwy. 200S, 23 km south of Circle between the 294/293 highway markersVery dry, sunny open ditch. Plants were collected on south and north facing slopes.Artemisia spp., Juniperus sp.Very abundantNo plants were flowering

pseudaurea

Packera pseudaurea (Rydberg) W.A. Weber & Á. Lövestreambank groundsel;false-gold groundsel;western golden groundsel;thin-leaved groundsel;golden groundsel;streambank butterweedPackera pseudaureaCypress Hills Provincial Park, Spruce Coulee campgroundunderstory of spruce/aspen forest, gravely soil in and around parking lotSpruce, Aspenabundant but patch