Geographic Variation in the South American Cricetine Rodent Bolomys lasiurus

1987 ◽  
Vol 68 (3) ◽  
pp. 578-594 ◽  
Author(s):  
R. H. Macedo ◽  
M. A. Mares
Keyword(s):  
Geographic Variation ◽  
South American ◽  
The South

scholarly journals On clutch size and hatching success of the South American turtles Podocnemis expansa (Schweigger, 1812) and P. unifilis Troschel, 1848 (Testudines, Podocnemididae)

2003 ◽  
Vol 75 (4) ◽  
pp. 415-430 ◽  
Author(s):  
Paulo Emilio Vanzolini
Keyword(s):  
Regression Analysis ◽  
Geographic Variation ◽  
Clutch Size ◽  
Egg Size ◽  
Hatching Success ◽  
South American ◽  
Geographic Differentiation ◽  
Egg Volume ◽  
The South ◽  
Podocnemis Expansa

Data on clutch size and hatching success of P. expansa were gathered for seven beaches traditionally used by the species and re-analyzed statistically by means of regression analysis, of the number of eggs on the number of females (or nests) and of the number of young on the number of eggs. All regressions were linear, passed through the origin and had excellent fits. Average clutch size varied from 75 to 123, and presented geographic differentiation: (i) Rio Orinoco, (ii) Rio Trombetas + Rio Branco and (iii) Rio Juruá + Rio Purus. Average hatching success was ca. 83%. In P. unifilis there was also geographic variation in clutch size, the Iquitos area showing the highest values. Hatching success of P. unifilis was uniformly high: only one sample, from Iquitos, had less than 90% success. The outstanding fit of the clutch size regressions leads one to consider egg volume variability, which was found to be high in both species, in contradiction with current optimal egg size theory.

Cnidochloa: A New Genus of Grasses from Brazil (Poaceae: Panicoideae: Paniceae)

2020 ◽  
Vol 105 (2) ◽  
pp. 183-194
Author(s):  
Fernando O. Zuloaga ◽  
Sandra S. Aliscioni ◽  
M. Amalia Scataglini
Keyword(s):  
New Genus ◽  
Phylogenetic Position ◽  
South American ◽  
The South ◽  
South American Species ◽  
Molecular Characters

Generic boundaries of the South American species Panicum longipedicellatum Swallen are explored and compared with allied genera of the tribe Paniceae. On the basis of morphological, anatomical, and molecular characters a new genus, Cnidochloa Zuloaga, is proposed. The phylogenetic position of the new genus within the Paniceae is evaluated.

scholarly journals Microplastics pollution in the South American Pantanal

2021 ◽  
Vol 3 ◽  
pp. 100088
Author(s):  
Érika de Faria ◽  
Pierre Girard ◽  
Carolina Silva Nardes ◽  
Andressa Moreschi ◽  
Susete Wambier Christo ◽  
...  
Keyword(s):  
South American ◽  
The South

Onset and demise dates of the rainy season in the South American Monsoon region: a cluster analysis result

2021 ◽  
Author(s):  
Maria A. M. Rodrigues ◽  
Sâmia R. Garcia ◽  
Mary T. Kayano ◽  
Alan J. P. Calheiros ◽  
Rita V. Andreoli
Keyword(s):  
Cluster Analysis ◽  
Rainy Season ◽  
South American ◽  
Monsoon Region ◽  
The South ◽  
South American Monsoon
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