Small scale habitat modeling for Commerson's dolphin ( Cephalorhynchus commersonii ) in northern Patagonia, Argentina

2021 ◽  
Author(s):  
Mariano Alberto Coscarella ◽  
Nicolás Sueyro ◽  
Enrique Alberto Crespo ◽  
Maria Grazia Pennino
Keyword(s):  
Habitat Modeling ◽  
Small Scale ◽  
Northern Patagonia ◽  
Commerson’S Dolphin ◽  
Cephalorhynchus Commersonii

Nothofagus regeneration in treefall gaps in northern Patagonia

1989 ◽  
Vol 19 (3) ◽  
pp. 365-371 ◽  
Author(s):  
Thomas T. Veblen
Keyword(s):  
Large Scale ◽  
Small Scale ◽  
Rain Forests ◽  
Mixed Stands ◽  
Northern Patagonia ◽  
Canopy Tree ◽  
The Andes ◽  
Treefall Gaps ◽  
Exogenous Disturbance ◽  
Gap Phase

In the rain shadow of the Andes in northern Patagonia, the evergreen beech Nothofagusdombeyi occurs in mixed stands with the xeric trees Austrocedruschilensis and (or) Nothofagusantarctica. In two old-growth stands (>150 years old), size and age structures, treefall patterns, and regeneration responses to treefalls were examined. In the stand codominated by N. dombeyi and Austrocedrus, recruitment of both species occurs in small treefall gaps. The relative proportions of treefalls and potential successors in gaps imply that gap-phase regeneration is maintaining this stand in compositional equilibrium. In the second stand, N. antarctica was formerly a common canopy tree, but currently is not regenerating in treefall gaps; gaps are occupied instead by N. dombeyi. The successful regeneration of N. dombeyi in small treefall gaps in Patagonian forests contrasts with the dependence of this species on large-scale exogenous disturbance for its regeneration in lowland and montane Chilean rain forests. Small-scale gap-phase regeneration of N. dombeyi in Patagonian forests is successful because of (i) the lack of competing shade-tolerant tree species and (ii) the inability of understory bamboos to form dence understories in these relatively xeric habitats.

Stranding of a Commerson's dolphin, Cephalorhynchus commersonii, in Buenos Aires Province, Argentina

2010 ◽  
Vol 3 ◽  
Author(s):  
Miguel Iñíguez ◽  
Marta Hevia ◽  
Frank Cipriano ◽  
Javier Sarradell ◽  
Ricardo Doumecq Milieu
Keyword(s):  
Buenos Aires ◽  
Buenos Aires Province ◽  
Commerson’S Dolphin ◽  
Cephalorhynchus Commersonii

Morphologie externe et pigmentation du dauphin de Commerson, Cephalorhynchus commersonii (Lacépède, 1804), en particulier celui des îles Kerguelen

1984 ◽  
Vol 62 (12) ◽  
pp. 2465-2475 ◽  
Author(s):  
Daniel Robineau
Keyword(s):  
Sexual Dimorphism ◽  
Color Pattern ◽  
External Morphology ◽  
South American ◽  
Accurate Data ◽  
Kerguelen Islands ◽  
Black And White ◽  
Total Length ◽  
Commerson’S Dolphin ◽  
Cephalorhynchus Commersonii

Accurate data on the external morphology and color pattern of Commerson's dolphin (Cephalorhynchus commersonii) off the Kerguelen Islands were obtained by studying 11 individuals. The total length of the animals is 142,6 to 174 cm and their weight ranges between 55 and 86 kg. Their coloration is black, grey, and white; a sexual dimorphism exists in the form of genital patches. As far as I know, these dolphins are much bigger and heavier than South American specimens. Their coloration also differs from the typically black and white pattern of the latter. These characteristics suggest that the Kerguelen Islands population is isolated from the main stock of the species.

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