Evol Ecol Res 13: 647-659 (2011) Full PDF if your library subscribes.
Exploring the functional association between physiological plasticity, climatic variability, and geographical latitude: lessons from land snails
Daniel E. Naya1,2, Tamara Catalán2, Paulina Artacho3*, Juan Diego Gaitán-Espitia3 and Roberto F. Nespolo3
1Departamento de Ecología y Evolución, Facultad de Ciencias & Centro Universitario de la Regional Este, Universidad de la República, Montevideo, Uruguay, 2Center for Advanced Studies in Ecology and Biodiversity, P. Universidad Católica de Chile, Santiago, Chile and 3Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Chile
Correspondence: D.E. Naya, Sección Evolución (Piso 6, Ala Norte), Facultad de Ciencias, Universidad de la República, Montevideo 11400, Uruguay.
Background: The climatic variability hypothesis states that, as the range of climatic fluctuation experienced by terrestrial animals increases with latitude, individuals at higher latitudes should be more plastic than individuals inhabiting lower latitudes. However, it is unclear whether comparatively high flexibility at higher latitudes is due to the direct effect of climatic variability or to other factors associated with latitude.
Aim: To investigate the relationship between phenotypic flexibility, geographical latitude, and climatic variability using a dataset where latitude and climatic variability are inversely related.
Methods: We assessed the physiological plasticity to cope with thermal change (10°C vs. 20°C), at the level of metabolic rate and organ dry weight, in three populations of the brown garden snail (Cornu aspersum): Viña del Mar (33°20′S, 71°32′W), with high temperature and rainfall variability; Concepción (36°47′S, 73°7′W), with a narrow range of temperature variability and intermediate rainfall variability; and Valdivia (39°38′S, 73°5′W), with low temperature and rainfall variability.
Results: Standard metabolic rate was higher at 20°C than at 10°C, but did not differ between populations. Intestine dry weight did not differ among populations but it was higher at 20°C than at 10°C, particularly for individuals from the Viña del Mar and Concepción populations. Hepatopancreas and kidney dry weight differed between populations, which was due to higher values in Viña del Mar at 20°C.
Conclusions: Flexibility in the weight of the organs analysed changed in a similar fashion to annual temperature variation at each locality, suggesting that, as stated by the climatic variability hypothesis, climatic variability is the main force behind physiological plasticity.
Keywords: climatic variability hypothesis, Cornu aspersum, digestive flexibility, macrophysiology, metabolic rate, phenotypic plasticity.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2011 Daniel E. Naya. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.