Foraging under Predation Risk in the Wild Guinea Pig Cavia aperea

Oikos ◽  
1991 ◽  
Vol 62 (1) ◽  
pp. 20 ◽  
Author(s):  
M. H. Cassini
Keyword(s):  
Guinea Pig ◽  
Predation Risk ◽  
In The Wild ◽  
Cavia Aperea

Blastocyst recovery and multifactorial gene expression analysis in the wild guinea pig (Cavia aperea)

2016 ◽  
Vol 86 (5) ◽  
pp. 1299-1307 ◽  
Author(s):  
Romy Hribal ◽  
Anja Guenther ◽  
Kathrin Rübensam ◽  
Katarina Jewgenow
Keyword(s):  
Gene Expression ◽  
Guinea Pig ◽  
Expression Analysis ◽  
Gene Expression Analysis ◽  
In The Wild ◽  
Cavia Aperea

Ontogeny of running performance in the wild guinea pig (Cavia aperea)

2003 ◽  
Vol 68 (4) ◽  
pp. 214-223 ◽  
Author(s):  
F. Trillmich ◽  
Martina Bieneck ◽  
Edda Geissler ◽  
H.-J. Bischof
Keyword(s):  
Guinea Pig ◽  
Running Performance ◽  
In The Wild ◽  
Cavia Aperea

Characterization of fetal growth by repeated ultrasound measurements in the wild guinea pig (Cavia aperea)

2014 ◽  
Vol 82 (3) ◽  
pp. 490-494 ◽  
Author(s):  
K. Schumann ◽  
A. Guenther ◽  
F. Göritz ◽  
K. Jewgenow
Keyword(s):  
Guinea Pig ◽  
Fetal Growth ◽  
Ultrasound Measurements ◽  
In The Wild ◽  
Cavia Aperea

scholarly journals Impact of continuous predator threat on telomere dynamics in parent and nestling pied flycatchers

Oecologia ◽  
2019 ◽  
Vol 191 (4) ◽  
pp. 757-766 ◽  
Author(s):  
Tiia Kärkkäinen ◽  
Pauliina Teerikorpi ◽  
Bineet Panda ◽  
Samuli Helle ◽  
Antoine Stier ◽  
...  
Keyword(s):  
Predation Risk ◽  
Telomere Maintenance ◽  
Stress Hormone ◽  
Ageing Rate ◽  
In The Wild ◽  
Males And Females ◽  
Perceived Predation Risk ◽  
Telomere Dynamics ◽  
Predator Threat

Abstract In addition to direct mortality, predators can have indirect effects on prey populations by affecting prey behaviour or physiology. For example, predator presence can increase stress hormone levels, which can have physiological costs. Stress exposure accelerates the shortening of telomeres (i.e. the protective caps of chromosomes) and shorter telomeres have been linked to increased mortality risk. However, the effect of perceived predation risk on telomeres is not known. We investigated the effects of continuous predator threat (nesting Eurasian pygmy owl Glaucidium passerinum) on telomere dynamics of both adult and partially cross-fostered nestling pied flycatchers (Ficedula hypoleuca) in the wild. Females nesting at owl-inhabited sites showed impaired telomere maintenance between incubation and chick rearing compared to controls, and both males and females ended up with shorter telomeres at owl-inhabited sites in the end of chick rearing. On the contrary, both original and cross-fostered chicks reared in owl sites had consistently longer telomeres during growth than chicks reared at control sites. Thus, predation risk may cause a long-term cost in terms of telomeres for parents but not for their offspring. Predators may therefore affect telomere dynamics of their preys, which could have implications for their ageing rate and consequently for population dynamics.

scholarly journals Risk of social colours in an agamid lizard: implications for the evolution of dynamic signals

2019 ◽  
Vol 15 (5) ◽  
pp. 20190207 ◽  
Author(s):  
Madhura S. Amdekar ◽  
Maria Thaker
Keyword(s):  
Natural Selection ◽  
Social Interactions ◽  
Predation Risk ◽  
Colour Pattern ◽  
Male Aggression ◽  
Visual Systems ◽  
In The Wild ◽  
Predation Costs ◽  
Colour Patterns ◽  
Ecological Cost

The forces of sexual and natural selection are typically invoked to explain variation in colour patterns of animals. Although the benefits of conspicuous colours for social signalling are well documented, evidence for their ecological cost, especially for dynamic colours, remains limited. We examined the riskiness of colour patterns of Psammophilus dorsalis , a species in which males express distinct colour combinations during social interactions. We first measured the conspicuousness of these colour patterns on different substrates based on the visual systems of conspecifics and predators (bird, snake, canid) and then quantified actual predation risk on these patterns using wax/polymer lizard models in the wild. The black and red male state exhibited during courtship was the most conspicuous to all visual systems, while the yellow and orange male aggression state and the brown female colour were least conspicuous. Models bearing the courtship colour pattern experienced the highest predator attacks, irrespective of the substrate they were placed on. Thus, social colours of males are not only conspicuous but also risky. Using physiological colours to shift in and out of conspicuous states may be an effective evolutionary solution to balance social signalling benefits with predation costs.

Species-level differentiation of two cryptic species pairs of wild cavies, genera Cavia and Galea, with a discussion of the relationship between social systems and phylogeny in the Caviinae

2004 ◽  
Vol 82 (3) ◽  
pp. 516-524 ◽  
Author(s):  
Fritz Trillmich ◽  
Cornelia Kraus ◽  
Joachim Künkele ◽  
Matthias Asher ◽  
Mario Clara ◽  
...  
Keyword(s):  
Guinea Pig ◽  
Base Pair ◽  
Social Systems ◽  
Phylogenetic Position ◽  
Published Data ◽  
Mitochondrial Rna ◽  
Simple Relationship ◽  
Distance Analysis ◽  
The Relationship ◽  
Cavia Aperea

Two little-known species of guinea-pig from the genera Cavia and Galea (Cavia magna Ximénez, 1980 and Galea sp. nov.) have recently been studied in more detail with respect to their behavior, social structure, and mating system. To determine the specific distinctness of these little-known species from Cavia aperea Erxleben, 1777 and Galea musteloides Meyen, 1832, crossbreeding between species was tried and it demonstrated that the two Cavia species will rarely cross in captivity to produce hybrids of much reduced fertility, whereas the Galea species could not be crossed. To analyze the phylogenetic position of C. magna and Galea sp. nov., we present an analysis based on major parts of the 12S (778 base pair) and 16S genes of mitochondrial RNA (1435 base pair) in conjunction with corresponding data on all other genera of the Caviinae. We also determined the relationship between C. magna and the sympatric wild guinea-pig (C. aperea) and its domestic form (Cavia aperea f. porcellus (Linnaeus, 1758)). Phylogenetic and distance analysis of all genera of cavies (Cavia (two species), Galea (two species), Kerodon, Microcavia) showed the close relationship of C. magna with C. aperea and the latter's particularly low genetic distance to C. aperea f. porcellus. Galea sp. nov. differed markedly from G. musteloides. Of the three genera, Galea appears most distinct. The genus Kerodon clustered with the genus Hydrochaeris, supporting the previous conclusion by Rowe and Honeycutt (2002. Mol. Biol. Evol. 19: 263–277) regarding the placement of the genus Hydrochaeris within the Caviidae. Recently published data on the social systems of the above-mentioned cavy species, however, show their great inter- and intra-specific social flexibility and contradict the interpretation of the same authors about a simple relationship between phylogeny and social systems in the Caviidae.

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