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Comparative support...
Comparative support for the expensive tissue hypothesis : Big brains are correlated with smaller gut and greater parental investment in Lake Tanganyika cichlids
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- Tsuboi, Masahito (författare)
- Uppsala universitet,Zooekologi,Uppsala Univ, Dept Ecol & Genet Anim Ecol, Evolutionary Biol Ctr, SE-75236 Uppsala, Sweden
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- Husby, Arild (författare)
- Univ Helsinki, Dept Biosci, FI-00014 Helsinki, Finland
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- Kotrschal, Alexander (författare)
- Stockholms universitet,Avdelningen för etologi,Stockholm Univ, Dept Zool Ethol, SE-10691 Stockholm, Sweden
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- Hayward, Alexander (författare)
- Stockholms universitet,Avdelningen för etologi,Stockholm Univ, Dept Zool Ethol, SE-10691 Stockholm, Sweden
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- Buechel, Severine D. (författare)
- ETH Zürich Institute of Integrative Biology (IBZ), Switzerland,ETH, Inst Integrat Biol IBZ, CH-8092 Zurich, Switzerland
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- Zidar, Josefina (författare)
- Linköpings universitet,Biologi,Tekniska högskolan
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- Løvlie, Hanne (författare)
- Linköpings universitet,Biologi,Tekniska högskolan
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- Kolm, Niclas (författare)
- Stockholms universitet,Avdelningen för etologi,Stockholm Univ, Dept Zool Ethol, SE-10691 Stockholm, Sweden
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(creator_code:org_t)
- 2014-12-17
- 2015
- Engelska.
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Ingår i: Evolution. - : Wiley. - 0014-3820 .- 1558-5646. ; 69:1, s. 190-200
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Abstract
Ämnesord
Stäng
- The brain is one of the most energetically expensive organs in the vertebrate body. Consequently, the energetic requirements of encephalization are suggested to impose considerable constraints on brain size evolution. Three main hypotheses concerning how energetic constraints might affect brain evolution predict covariation between brain investment and (1) investment into other costly tissues, (2) overall metabolic rate, and (3) reproductive investment. To date, these hypotheses have mainly been tested in homeothermic animals and the existing data are inconclusive. However, there are good reasons to believe that energetic limitations might play a role in large-scale patterns of brain size evolution also in ectothermic vertebrates. Here, we test these hypotheses in a group of ectothermic vertebrates, the Lake Tanganyika cichlid fishes. After controlling for the effect of shared ancestry and confounding ecological variables, we find a negative association between brain size and gut size. Furthermore, we find that the evolution of a larger brain is accompanied by increased reproductive investment into egg size and parental care. Our results indicate that the energetic costs of encephalization may be an important general factor involved in the evolution of brain size also in ectothermic vertebrates.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- Brain evolution
- constraints
- encephalization
- phylogenetic comparative methods
- the expensive tissue hypothesis
- trade-offs
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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