Seed production in Polylepis australis (Rosaceae) as influenced by tree size, livestock and interannual climate variations in the mountains of central Argentina

New Forests ◽  
2012 ◽  
Vol 44 (2) ◽  
pp. 233-247 ◽  
Author(s):  
Julieta Pollice ◽  
Paula Marcora ◽  
Daniel Renison
Keyword(s):  
Seed Production ◽  
Tree Size ◽  
Climate Variations ◽  
Central Argentina ◽  
Polylepis Australis

Geastrum minutisporum sp. nov. from Polylepis australis woodlands in central Argentina

Mycoscience ◽  
2016 ◽  
Vol 57 (3) ◽  
pp. 157-163 ◽  
Author(s):  
María L. Hernández Caffot ◽  
Leonardo D. Amarilla ◽  
Esteban M. Crespo ◽  
Laura S. Domínguez
Keyword(s):  
Central Argentina ◽  
Polylepis Australis

scholarly journals Genetic structure and diversity of Polylepis australis (Rosaceae) tree populations from central Argentina: Implications for forest conservation

2011 ◽  
Vol 60 (1-6) ◽  
pp. 55-61 ◽  
Author(s):  
N. B. Julio ◽  
J. C. Rondan Dueñas ◽  
D. Renison ◽  
I. Hensen
Keyword(s):  
Genetic Variability ◽  
Forest Restoration ◽  
Diversity Index ◽  
Isolation By Distance ◽  
River Basins ◽  
Issr Markers ◽  
Restricted Gene Flow ◽  
Genetic Constitution ◽  
Central Argentina ◽  
Polylepis Australis

Abstract Worldwide, large areas of forest are being transformed to other land cover types and the resulting fragmented populations may suffer from restricted gene flow leading to genetic pauperization and increased inbreeding. To assess the genetic constitution of fragmented Polylepis australis mountain forests of central Argentina, analyses of the structure and diversity of ISSR markers were carried out for 90 trees distributed throughout five river basins with differing degrees of fragmentation. Overall, average polymorphism (P) ranged between 87.2 and 94.9% (95% criterion) while marker diversity index (M) varied between 0.35 and 0.39; values which are comparable with other wind-pollinated tree species. Analysis of molecular variance (AMOVA) revealed that most genetic variation occurred within river basins (97.8%), with only a little occurring between river basins (2.2%; ΦST = 0.02). In addition, Mantel’s test indicated that P. australis does not follow the usual pattern of isolation by distance; instead the UPGMA method showed that trees from the two most degraded river basins formed a group while trees from the three better preserved basins formed another. As such, either effective pollen flow has maintained high levels of genetic diversity, or present day genetic variability is a remnant of a recently fragmented ancestral panmictic population. We conclude that, at present, genetic degradation in P. australis populations of central Argentina is not as important as ecological degradation – such as soil loss, intensive browsing by livestock or increased frequencies of wildfires, and that genetic variability is still fully available for forest restoration.

scholarly journals Consistency of Cone Production in Individual Red Pine

1988 ◽  
Vol 64 (6) ◽  
pp. 480-484 ◽  
Author(s):  
W. M. Stiell
Keyword(s):  
Seed Production ◽  
Tree Growth ◽  
Basal Area ◽  
Pinus Resinosa ◽  
Red Pine ◽  
Tree Size ◽  
Total Production ◽  
Crop Size ◽  
Cone Production ◽  
Production Area

A plantation of red pine (Pinus resinosa Ait.) produced heavy cone crops in 1970 and 1984. Established at 6.5 × 6.5 m, the stand was 18-years old in 1970 and still open-grown; crowns were closed before 1984. Cone production at the two dates was compared for 28 trees. While total production was similar for 1970 and 1984, distribution within the sample differed. Although 18% of the trees maintained their rank in 1984, some large changes in production ranking took place from one crop to the next. Despite a tendency at both dates for crop size to increase with current dbh, exceptions were evident and the largest trees did not necessarily bear the most cones. Crop size in 1970 was the variable most closely associate with 1984 crop size and was significantly correlated with it independently 1984 dbh. High cone production did not seem to depress tree growth, based on a comparison of 1970-72 basal area increment of more versus less prolific cone bearers. Before a stand has borne its first good cone crop, expectations for highest yields would have to be based on tree size. For subsequent crops, previous production by individuals would be the best guide. The two top cone bearers far surpassed all others in both crop years and would be the first individuals selected for seed trees in a seed production area.

New Species Causing Decay on Living Polylepis Australis in Cordoba, Central Argentina

Mycologia ◽  
2003 ◽  
Vol 95 (2) ◽  
pp. 347 ◽  
Author(s):  
Gerardo Robledo ◽  
Carlos Urcelay ◽  
Mario Rajchenberg
Keyword(s):  
New Species ◽  
Central Argentina ◽  
Polylepis Australis

Tulostoma domingueziae sp. nov. from Polylepis australis woodlands in Córdoba Mountains, central Argentina

Mycologia ◽  
2011 ◽  
Vol 103 (5) ◽  
pp. 1047-1054 ◽  
Author(s):  
María L. Hernández Caffot ◽  
Laura S. Domínguez ◽  
Kentaro Hosaka ◽  
Esteban M. Crespo
Keyword(s):  
Central Argentina ◽  
Polylepis Australis

RAPD and ISSR markers indicate diminished gene flow due to recent fragmentation of Polylepis australis woodlands in central Argentina

2008 ◽  
Vol 36 (5-6) ◽  
pp. 329-335 ◽  
Author(s):  
Norma Julio ◽  
Ana Sobral ◽  
Juan Rondan Dueñas ◽  
Julio Di Rienzo ◽  
Daniel Renison ◽  
...  
Keyword(s):  
Gene Flow ◽  
Issr Markers ◽  
Central Argentina ◽  
Rapd And Issr ◽  
Polylepis Australis

scholarly journals High lichen species richness in Polylepis australis forest: new records from South America and Argentina

2020 ◽  
pp. 386-402
Author(s):  
Juan Manuel Rodriguez ◽  
Raúl Diaz Dominguez ◽  
Helmut Mayrhofer ◽  
Alfredo Passo ◽  
Daniel Renison
Keyword(s):  
Species Richness ◽  
New Species ◽  
South America ◽  
Small Area ◽  
New Records ◽  
Lichen Species ◽  
Central Argentina ◽  
Polylepis Australis

The Polylepis australis forests in Central Argentina support a great biodiversity in a relative small area. As a result of this study focusing on the diversity and ecology of the lichen communities of these forests, we present five new species for South America: Rinodina ficta, R. malcolmii, R. obscura, Usnea glabrata, Tetramelas triphragmioides and eight taxa new for Argentina: Calicium abietinum, Erioderma leylandii subsp. leylandii, Leptogium microstictum, Phaeophyscia endococcinodes, Rinodina dolichospora, R. intermedia, Usnea cirrosa and U. flavocardia. Unidentified Usnea species, similar to U. silesiaca, were also characterized and discussed.

Sign in / Sign up

Export Citation Format

Share Document