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Pipefish embryo oxygenation, survival and development: egg size, male size and temperature effects

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Pipefish embryo oxygenation, survival and development : egg size, male size and temperature effects. / Nygård, Malin; Kvarnemo, Charlotta; Ahnesjo, Ingrid; Braga Goncalves, Ines.

In: Behavioral Ecology, 29.06.2019.

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Nygård, Malin ; Kvarnemo, Charlotta ; Ahnesjo, Ingrid ; Braga Goncalves, Ines. / Pipefish embryo oxygenation, survival and development : egg size, male size and temperature effects. In: Behavioral Ecology. 2019.

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@article{1dac96efa1c048f194b799443999cd56,
title = "Pipefish embryo oxygenation, survival and development: egg size, male size and temperature effects",
abstract = "In animals with uniparental care, the quality of care provided by one sex can deeply impact the reproductive success of both sexes. Studying variation in parental care quality within a species and which factors may affect it can therefore shed important light on patterns of mate choice and other reproductive decisions observed in nature. Using Syngnathus typhle, a pipefish species with extensive uniparental male care, with embryos developing inside a brood pouch during a lengthy pregnancy, we assessed how egg size (which correlates positively with female size), male size and water temperature affect brooding traits that relate to male care quality, all measured on day 18, approximately 1/3, of the brooding period. We found that larger males brooded eggs at lower densities, and their embryos were heavier than those of small males independent of initial egg size. However, large males had lower embryo survival relative to small males. We found no effect of egg size or of paternal size on within-pouch oxygen levels, but oxygen levels were significantly higher in the bottom than the middle section of the pouch. Males that brooded at higher temperatures had lower pouch oxygen levels presumably because of higher embryo developmental rates, as more developed embryos consume more oxygen. Together, our results suggest that small and large males follow distinct paternal strategies: large males positively affect embryo size while small males favour embryo survival. As females prefer large mates, offspring size at independence may be more important to female fitness than offspring survival during development.",
keywords = "Body condition, Embryo density, Embryo size, Embryo survival, Male size, Oxygen provisioning",
author = "Malin Nyg{\aa}rd and Charlotta Kvarnemo and Ingrid Ahnesjo and {Braga Goncalves}, Ines",
year = "2019",
month = "6",
day = "29",
doi = "10.1093/beheco/arz101",
language = "English",
journal = "Behavioral Ecology",
issn = "1045-2249",
publisher = "Oxford University Press",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Pipefish embryo oxygenation, survival and development

T2 - egg size, male size and temperature effects

AU - Nygård, Malin

AU - Kvarnemo, Charlotta

AU - Ahnesjo, Ingrid

AU - Braga Goncalves, Ines

PY - 2019/6/29

Y1 - 2019/6/29

N2 - In animals with uniparental care, the quality of care provided by one sex can deeply impact the reproductive success of both sexes. Studying variation in parental care quality within a species and which factors may affect it can therefore shed important light on patterns of mate choice and other reproductive decisions observed in nature. Using Syngnathus typhle, a pipefish species with extensive uniparental male care, with embryos developing inside a brood pouch during a lengthy pregnancy, we assessed how egg size (which correlates positively with female size), male size and water temperature affect brooding traits that relate to male care quality, all measured on day 18, approximately 1/3, of the brooding period. We found that larger males brooded eggs at lower densities, and their embryos were heavier than those of small males independent of initial egg size. However, large males had lower embryo survival relative to small males. We found no effect of egg size or of paternal size on within-pouch oxygen levels, but oxygen levels were significantly higher in the bottom than the middle section of the pouch. Males that brooded at higher temperatures had lower pouch oxygen levels presumably because of higher embryo developmental rates, as more developed embryos consume more oxygen. Together, our results suggest that small and large males follow distinct paternal strategies: large males positively affect embryo size while small males favour embryo survival. As females prefer large mates, offspring size at independence may be more important to female fitness than offspring survival during development.

AB - In animals with uniparental care, the quality of care provided by one sex can deeply impact the reproductive success of both sexes. Studying variation in parental care quality within a species and which factors may affect it can therefore shed important light on patterns of mate choice and other reproductive decisions observed in nature. Using Syngnathus typhle, a pipefish species with extensive uniparental male care, with embryos developing inside a brood pouch during a lengthy pregnancy, we assessed how egg size (which correlates positively with female size), male size and water temperature affect brooding traits that relate to male care quality, all measured on day 18, approximately 1/3, of the brooding period. We found that larger males brooded eggs at lower densities, and their embryos were heavier than those of small males independent of initial egg size. However, large males had lower embryo survival relative to small males. We found no effect of egg size or of paternal size on within-pouch oxygen levels, but oxygen levels were significantly higher in the bottom than the middle section of the pouch. Males that brooded at higher temperatures had lower pouch oxygen levels presumably because of higher embryo developmental rates, as more developed embryos consume more oxygen. Together, our results suggest that small and large males follow distinct paternal strategies: large males positively affect embryo size while small males favour embryo survival. As females prefer large mates, offspring size at independence may be more important to female fitness than offspring survival during development.

KW - Body condition

KW - Embryo density

KW - Embryo size

KW - Embryo survival

KW - Male size

KW - Oxygen provisioning

U2 - 10.1093/beheco/arz101

DO - 10.1093/beheco/arz101

M3 - Article

JO - Behavioral Ecology

JF - Behavioral Ecology

SN - 1045-2249

M1 - arz101

ER -