Chloroplast haplotypes suggest preglacial differentiation and separate postglacial migration paths for the threatened North American forest tree Juglans cinerea L.

2015 ◽  
Vol 11 (2) ◽  
Author(s):  
Kristen M. Laricchia ◽  
Tim S. McCleary ◽  
Sean M. Hoban ◽  
Daniel Borkowski ◽  
Jeanne Romero-Severson
Keyword(s):  
North American ◽  
Forest Tree ◽  
Juglans Cinerea ◽  
Postglacial Migration ◽  
Chloroplast Haplotypes

A DESCRIPTIVE LIST OF NATURAL AND ARTIFICIAL INTERSPECIFIC HYBRIDS IN NORTH AMERICAN FOREST-TREE GENERA

1939 ◽  
Vol 17c (12) ◽  
pp. 411-444 ◽  
Author(s):  
L. P. V. Johnson
Keyword(s):  
North American ◽  
Interspecific Hybrids ◽  
Forest Tree ◽  
Forest Trees ◽  
Tabular Form

Over 400 hybrids involving 28 North American genera of forest trees are described in tabular form with the object, primarily, of providing useful information for the forest-tree breeder. The genera involved are: Abies, Acer, Aesculus, Alnus, Arbutus, Betula, Carya, Castanea, Catalpa, Cyprus, Crataegus, Cupressus, Gleditsia, Ilex, Juglans, Larix, Magnolia, Picea, Pinus, Platanus, Populus, Quercus, Robinia, Salix, Taxus, Tilia, Tsuga, and Ulmus.

Population structure of Heterobasidion annosum from North America and Europe

1993 ◽  
Vol 71 (8) ◽  
pp. 1064-1071 ◽  
Author(s):  
William J. Otrosina ◽  
Thomas E. Chase ◽  
Fields W. Cobb Jr. ◽  
Kari Korhonen
Keyword(s):  
Population Structure ◽  
North America ◽  
North American ◽  
Forest Tree ◽  
Heterobasidion Annosum ◽  
Evolutionary Relationships ◽  
The North ◽  
Isozyme Loci ◽  
Intersterility Groups ◽  
European Populations

Isolates of Heterobasidion annosum (Fr.) Bref. representing North American S and P and European S, P, and F intersterility groups were subjected to isozyme analysis. European S, P, and F groups had more variability than the North American S and P groups in expected hterozygosity, number of alleles per locus, and percent polymorphic loci. In contrast with the North American S and P groups, the European intersterility groups could not be distinguished from each other on the basis of individual isozyme loci, although significant differences in allele frequencies exist between European S and P groups. This suggests that evolution proceeded at different rates in the intersterility groups, or intersterility barriers appeared later in the European populations relative to the North American populations of H. annosum. Changes in climate and host species associations during the Tertiary may have been a major factor in evolution of H. annosum intersterility groups. Key words: allozymes, forest tree hosts, playnological events, evolutionary relationships, Hymenomycetes, root disease.

Range-wide distribution of genetic diversity in the North American tree Juglans cinerea: a product of range shifts, not ecological marginality or recent population decline

2010 ◽  
Vol 19 (22) ◽  
pp. 4876-4891 ◽  
Author(s):  
SEAN M. HOBAN ◽  
DANIEL S. BORKOWSKI ◽  
SUNSHINE L. BROSI ◽  
TIM S. McCLEARY ◽  
LAURA M. THOMPSON ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Population Decline ◽  
Wide Distribution ◽  
Range Shifts ◽  
Juglans Cinerea ◽  
The North

A review of the regeneration dynamics of North American boreal forest tree species

1999 ◽  
Vol 29 (6) ◽  
pp. 824-839 ◽  
Author(s):  
D F Greene ◽  
J C Zasada ◽  
L Sirois ◽  
D Kneeshaw ◽  
H Morin ◽  
...  
Keyword(s):  
North American ◽  
Tree Species ◽  
Shade Tolerance ◽  
Basal Area ◽  
Forest Tree ◽  
Organic Layer ◽  
Dormant Seed ◽  
Layer Depth ◽  
Short Term ◽  
Natural Fire

In this review, we focus on the biotic parameters that are crucial to an understanding of the recruitment dynamics of North American boreal tree species following natural (fire, budworm infestation, windthrow) or human-induced (clearcut, partial cut) disturbances. The parameters we emphasize are (i) the production of seeds and asexual stems (both of which, we argue, are a function of basal area density), (ii) the dispersal of seeds by wind (or the dispersion of asexual stems) as a function of distance from source, (iii) dormant seed bank capacity, (iv) organic layer depth as a determinant of germinant mortality and asexual bud response, and (v) shade tolerance as a partial arbiter of the density of advanced regeneration. Having identified the gaps in our knowledge, we conclude by suggesting a short-term research agenda whose completion would lead to the parameterized functions that would constitute the recruitment subroutine in a landscape-scale forest dynamics simulator.

Adaptation of the Connected Speech Test: Rerecording and Passage Equivalency

2020 ◽  
Vol 29 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Hasan K. Saleh ◽  
Paula Folkeard ◽  
Ewan Macpherson ◽  
Susan Scollie
Keyword(s):  
Speech Perception ◽  
North American ◽  
First Language ◽  
Intraclass Correlation ◽  
Normal Hearing ◽  
Connected Speech ◽  
Internal Reliability ◽  
Speech Test ◽  
The Mean ◽  
Unit Standard

Purpose The original Connected Speech Test (CST; Cox et al., 1987) is a well-regarded and often utilized speech perception test. The aim of this study was to develop a new version of the CST using a neutral North American accent and to assess the use of this updated CST on participants with normal hearing. Method A female English speaker was recruited to read the original CST passages, which were recorded as the new CST stimuli. A study was designed to assess the newly recorded CST passages' equivalence and conduct normalization. The study included 19 Western University students (11 females and eight males) with normal hearing and with English as a first language. Results Raw scores for the 48 tested passages were converted to rationalized arcsine units, and average passage scores more than 1 rationalized arcsine unit standard deviation from the mean were excluded. The internal reliability of the 32 remaining passages was assessed, and the two-way random effects intraclass correlation was .944. Conclusion The aim of our study was to create new CST stimuli with a more general North American accent in order to minimize accent effects on the speech perception scores. The study resulted in 32 passages of equivalent difficulty for listeners with normal hearing.

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