Die Determination bilateraler Organkomplexe des vorderen Kopfes durch strukturlose k�nstliche Induktoren bei Amphibien (Triturus alpestris)

1967 ◽  
Vol 159 (1) ◽  
pp. 127-140 ◽  
Author(s):  
Carl Woellwarth
Keyword(s):  
Triturus Alpestris

REGULAR ARTICLES / ARTICLES RÉGULIERSSize-related predation reduces intramorph competition in paedomorphic Alpine newts

2001 ◽  
Vol 79 (6) ◽  
pp. 943-948 ◽  
Author(s):  
Mathieu Denoël ◽  
Pierre Joly
Keyword(s):  
Resource Partitioning ◽  
Prey Size ◽  
Food Competition ◽  
Aquatic Habitats ◽  
Age At Maturity ◽  
Selective Predation ◽  
Facultative Paedomorphosis ◽  
Triturus Alpestris ◽  
Younger Age ◽  
Capture Range

Evolutionary theory assumes that facultative paedomorphosis in newts and salamanders is adaptive in allowing either a younger age at maturity or resource partitioning between the heterochronic morphs. In newt populations that only take the metamorphic ontogenetic pathway, juveniles are terrestrial and avoid food competition with larvae and breeding adults. In contrast, in populations where paedomorphosis occurs, branchiate newts of all sizes coexist in the aquatic habitats, posing the question of whether intramorph competition exists and its relationship with the evolution of paedomorphosis. We studied size-related predation in such a size-structured community of branchiate Alpine newts (Triturus alpestris) inhabiting a deep alpine lake. Although gape limitation may explain such size-related predation, individuals also exhibited selectivity according to prey size. Amongst small prey that were within the capture range of all newt size classes, smaller newts preyed on smaller items than did larger ones. We assume that such decisions favour the coexistence of different-sized individuals. It is suspected that such size-selective predation on items which are avoided by water-living metamorphs allows the maintenance of facultative paedomorphosis, in favouring resource partitioning between morphs.

Magnetic compass mediates nocturnal homing by the alpine newt, Triturus alpestris

2005 ◽  
Vol 58 (4) ◽  
pp. 361-365 ◽  
Author(s):  
Francisco J. Diego-Rasilla ◽  
Rosa M. Luengo ◽  
John B. Phillips
Keyword(s):  
Magnetic Compass ◽  
Triturus Alpestris ◽  
Alpine Newt
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