Search: onr:"swepub:oai:DiVA.org:uu-8310" >
Adaptation Along En...
-
Lindgren, Beatrice,1974-Uppsala universitet,Institutionen för ekologi och evolution
(author)
Adaptation Along Environmental Gradients: an Evaluation of Physiological Mechanisms and Ecological Constraints
Publisher, publication year, extent ...
-
Uppsala :Acta Universitatis Upsaliensis,2007
-
48 s.
-
electronicrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:uu-8310
-
ISBN:9789155470234
-
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8310URI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:vet swepub-contenttype
-
Subject category:dok swepub-publicationtype
Series
-
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology,1651-6214 ;366
Notes
-
For ectotherms living in seasonal environments, time available for development and growth is often constrained by the length of the growth season. Declining season length towards higher latitudes often select for latitudinal clines in development and growth rates, exhibiting increasing growth and developmental rates towards the north. However, the physiological and ecological factors enabling these clines are poorly understood.Our study system included eight populations of Rana temporaria along a 1500 km latitudinal gradient. We found increased growth rates in populations at higher latitudes to be the result of higher growth efficiency, partly due to increased relative gut length. Populations with higher growth rates also exhibited lower standard metabolic rates, implying that fast-growing individuals are able to achieve high growth rates by spending less energy on maintenance metabolism under low activity conditions.Predator densities, and antipredatory defenses in prey, are assumed to decrease towards higher latitudes. While all study populations responded to predator presence by decreasing activity and foraging, high latitude populations maintained higher activity levels in the presence of the predator. In trials with a free-ranging predator, high latitude tadpoles experienced higher mortality than those from the low latitudes. The higher activity level in the northern populations increases mortality under predation risk, but is probably needed to maintain high growth and development rates.When competing over resources, tadpoles from the low latitude population were inferior competitors, as indicated by their longer development time when raised together with high latitude tadpoles. We found no effect of latitude on size-corrected burst speed. The general effect of predator presence on burst speed depended on food availability, with well fed tadpoles being faster in the absence, and food restricted being faster in the presence of a predator.
Subject headings and genre
-
Biology
-
Rana temporaria
-
latitudinal clines
-
growth rate
-
growth efficiency
-
SMR
-
predation
-
competition
-
trade-off
-
Biologi
Added entries (persons, corporate bodies, meetings, titles ...)
-
Laurila, Anssi
(thesis advisor)
-
Höglund, Jacob
(thesis advisor)
-
Winberg, Svante
(thesis advisor)
-
Sih, Andrew,ProfessorDepartment of Environmental Science and Policy, Davis
(opponent)
-
Uppsala universitetInstitutionen för ekologi och evolution
(creator_code:org_t)
Internet link
Find in a library
To the university's database