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Evolutionary ecolog...
Evolutionary ecology of pipefish brooding structures: embryo survival and growth do not improve with a pouch
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- Braga Gonçalves, Inês (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,Univ Zurich, Dept Evolutionary Biol & Environm Studies, Anim Behav, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Univ Gothenburg, Dept Biol & Environm Sci, POB 463, S-40530 Gothenburg, Sweden.
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- Ahnesjö, Ingrid (författare)
- Uppsala universitet,Zooekologi
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- Kvarnemo, Charlotta, 1963 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,Univ Gothenburg, Dept Biol & Environm Sci, POB 463, S-40530 Gothenburg, Sweden.
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(creator_code:org_t)
- 2016-04-24
- 2016
- Engelska.
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Ingår i: Ecology and Evolution. - : Wiley. - 2045-7758. ; 6:11, s. 3608-3620
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Abstract
Ämnesord
Stäng
- For animals that reproduce in water, many adaptations in life-history traits such as egg size, parental care, and behaviors that relate to embryo oxygenation are still poorly understood. In pipefishes, seahorses and seadragons, males care for the embryos either in some sort of brood pouch, or attached ventrally to the skin on their belly or tail. Typically, egg size is larger in the brood pouch group and it has been suggested that oxygen supplied via the pouch buffers the developing embryos against hypoxia and as such is an adaptation that has facilitated the evolution of larger eggs. Here, using four pipefish species, we tested whether the presence or absence of brood pouch relates to how male behavior, embryo size, and survival are affected by hypoxia, with normoxia as control. Two of our studied species Entelurus aequoreus and Nerophis ophidion (both having small eggs) have simple ventral attachment of eggs onto the male trunk, and the other two, Syngnathus typhle (large eggs) and S. rostellatus (small eggs), have fully enclosed brood pouches on the tail. Under hypoxia, all species showed lower embryo survival, while species with brood pouches suffered greater embryo mortality compared to pouchless species, irrespective of oxygen treatment. Behaviorally, species without pouches spent more time closer to the surface, possibly to improve oxygenation. Overall, we found no significant benefits of brood pouches in terms of embryo survival and size under hypoxia. Instead, our results suggest negative effects of large egg size, despite the protection of brood pouches.
Ämnesord
- NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- Egg size
- embryo growth
- embryo survival
- environmental conditions
- low oxygen
- parental care
- role-reversed pipefish
- broad-nosed pipefish
- low dissolved-oxygen
- trout salmo-trutta
- egg-size evolution
- parental care
- syngnathus-typhle
- species syngnathidae
- male pregnancy
- valenciennea-longipinnis
- Environmental Sciences & Ecology
- Evolutionary Biology
- Egg size
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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