Document Detail

Life-history traits of two Mediterranean lizard populations: a possible example of countergradient covariation.
MedLine Citation:
PMID:  23076409     Owner:  NLM     Status:  Publisher    
The trade-off between clutch and offspring size, which is a central topic in life-history research, is shaped by natural selection to maximize the number of surviving offspring, but it also depends on the resources available for reproduction. Conspecific populations living in different environments may differ in adult body size, clutch mass, clutch size, offspring size, and/or post-natal growth rates, due either to phenotypic plasticity or to local adaptation. Here, we compare these traits and their relationships between two populations of the lizard Psammodromus algirus separated by a 600-m altitudinal gradient. We used a common garden design to control incubation temperature and food availability, with two different feeding treatments. Females were larger at the high-elevation site. Although SVL-adjusted clutch mass did not differ between populations, high-elevation females laid more but smaller eggs than low-elevation ones. Hatchlings were larger at lower elevation. Our common garden experiment revealed that low-elevation hatchlings grew faster than high-elevation hatchlings under both feeding treatments. However, higher food availability at higher altitude allows high-elevation lizards to grow faster and attain larger adult sizes, especially in the case of females. The two key adaptations of low-elevation lizards, large eggs and hatchlings and the ability to grow rapidly after hatching, are likely to enhance survival in low-productivity Mediterranean lowlands. Our data support the hypothesis that the reproductive strategies of these populations provide an example of countergradient variation, because the genotypes that encode for fast growth and large body size occurred in low food availability habitats where juveniles grew slowly and attained small adult sizes.
Pablo Iraeta; Alfredo Salvador; José A Díaz
Related Documents :
18979019 - Protocol for mosquito rearing (a. gambiae).
24630939 - Food addiction as a causal model of obesity. effects on stigma, blame, and perceived ps...
24122159 - Human health risk assessment of lead from mining activities at semi-arid locations in t...
2126269 - Consumption and mortality of the white-footed mouse (rodentia: muridae) and ord's kanga...
18710559 - Dry season ecology of anopheles gambiae complex mosquitoes in the gambia.
22982939 - Biomagnification of mercury through lake trout (salvelinus namaycush) food webs of lake...
12517119 - Effect of different soaking solutions on nutritive utilization of minerals (calcium, ph...
19123939 - Patterns of seasonal phytoplankton distribution in prairie saline lakes of the northern...
17625679 - The ethnocategory ''insect'' in the conception of the inhabitants of tapera county, sã...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-18
Journal Detail:
Title:  Oecologia     Volume:  -     ISSN:  1432-1939     ISO Abbreviation:  Oecologia     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Dpto. de Zoología y Antropología Física (Vertebrados), Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain,
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Brain renin-angiotensin system in the nexus of hypertension and aging.