Influence of Island Area and Isolation on Population Characteristics of Peromyscus leucopus

1986 ◽  
Vol 67 (2) ◽  
pp. 406-409 ◽  
Author(s):  
G. H. Adler ◽  
M. L. Wilson ◽  
M. J. Derosa
Keyword(s):  
Peromyscus Leucopus ◽  
Population Characteristics ◽  
Island Area

The distribution and behavior of Peromyscus maniculatus gracilis and Peromyscus leucopus noveboracensis (Rodentia: Cricetidae) in a southeastern Ontario woodlot

1970 ◽  
Vol 48 (6) ◽  
pp. 1187-1199 ◽  
Author(s):  
Donald A. Smith ◽  
S. Wayne Speller
Keyword(s):  
Competitive Exclusion ◽  
Peromyscus Leucopus ◽  
Population Characteristics ◽  
Exclusion Principle ◽  
Dense Population ◽  
Competitive Exclusion Principle ◽  
Upland Forest ◽  
Live Trapping ◽  
Tree Holes ◽  
And Behavior

P. m. gracilis and P. l. noveboracensis are sympatric in southeastern Ontario and some adjacent areas. Similar in appearance, food and breeding habits, and frequently cohabiting certain forests, they may occupy identical niches, contrary to the competitive exclusion principle. A 12-week summer live-trapping study in a woodlot containing upland, mixed, and cedar forest associations showed that although most of their population characteristics were similar, their local distributions, densities, and certain behaviors differed. Noveboracensis inhabited upland forest but avoided mixed and cedar forest associations apparently because suitable refuges were lacking. The less dense population of gracilis was ubiquitous; gracilis and noveboracensis cohabited the upland forest. On release from traps noveboracensis sometimes 'froze' before darting in a zigzag manner to nearby cover, and ran up trees significantly more than gracilis, which usually ran instantly, rapidly, and directly to a more distant ground refuge. Low densities of both species reduced competition for available food and refuges. This may have facilitated cohabitation in the upland forest where differential use of ground- and tree-holes also contributed to reduction of competition and thus to compatibility. Coexistence may be transitory there; with denser populations, potential competition might be minimized by emigration of the more exploratory gracilis.

Retrospective Diagnosis of Pontocerebellar Hypoplasia Type 1B in a Family with Two Deceased Newborn Children

2020 ◽  
Author(s):  
Irena Bradinova ◽  
Silvia Andonova ◽  
Alexey Savov
Keyword(s):  
Clinical Signs ◽  
Final Diagnosis ◽  
Population Based ◽  
Neuromuscular Disorder ◽  
Population Characteristics ◽  
High Risk Population ◽  
Pontocerebellar Hypoplasia ◽  
Clinical Genetic ◽  
Retrospective Diagnosis ◽  
Newborn Children

AbstractPontocerebellar hypoplasia type 1B is a severe autosomal recessive neurologic disorder characterized by a combination of cerebellar and spinal motor neuron degeneration beginning at birth. Pontocerebellar hypoplasia type 1B is caused by mutations in EXOSC3 gene. High prevalence of the p.Gly31Ala mutation was found recently, especially in the Roma ethnic minority. We present a young Bulgarian Roma family with two deceased newborn children manifesting severe neuromuscular disorder including severe muscle weakness, respiratory distress, and multiple joint contractures. Based on the clinical signs and family's population characteristics, DNA testing for the previously described EXOSC3 in Bulgarian Roma mutation c.92G > C; p.Gly31Ala was performed on blood samples of both parents and they were found to be heterozygous carriers. This finding indirectly confirmed the diagnosis of pontocerebellar hypoplasia type B in the deceased offspring. Knowledge of population-specific molecular bases of genetic conditions was the key to final diagnosis in the presented family. Designing of population-based clinical-genetic panels may be a powerful diagnostic tool for patients with such origin. Preconception carrier screening in high-risk population groups is a feasible option to discuss.

Population Characteristics and Feeding of Roach Rutilus rutilus in Small Regulated River of the Kyiv Polissya

2020 ◽  
Vol 56 (1) ◽  
pp. 42-48
Author(s):  
Ye. A. Gupalo ◽  
I. I. Abramyuk ◽  
S. A. Afanasyev ◽  
O. V. Manturova ◽  
Ye. V. Savchenko
Keyword(s):  
Rutilus Rutilus ◽  
Population Characteristics ◽  
Regulated River ◽  
Roach Rutilus Rutilus

Population Characteristics of Mistletoe (Viscum coloratum) in Wandashan Mountain

2013 ◽  
Vol 31 (4) ◽  
pp. 345
Author(s):  
Chang-Bao WANG ◽  
Zeng-Qi XU ◽  
Ren-Jie YUE
Keyword(s):  
Population Characteristics
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