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Morphology-Function Relationships and Repeatability in the Sperm of Passer Sparrows

Cramer, Emily R. A.; Laskemoen, Terje; Stensrud, Even; Rowe, Melissah; Haas, Fredrik LU ; Lifjeld, Jan T.; Saetre, Glenn-Peter and Johnsen, Arild (2015) In Journal of Morphology 276(4). p.370-377
Abstract
Sperm performance is likely to be an important determinant of male reproductive success, especially when females copulate with multiple males. Understanding sperm performance is therefore crucial to fully understand the evolution of male reproductive strategies. In this study, we examined the repeatability of sperm morphology and motility measures over three breeding seasons, and we studied relationships between sperm morphology and function. We conducted this study in wild-derived captive house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis). Results for the two species were similar. As predicted from results in other passerine species, total sperm length was highly repeatable across ejaculates, and repeatability for... (More)
Sperm performance is likely to be an important determinant of male reproductive success, especially when females copulate with multiple males. Understanding sperm performance is therefore crucial to fully understand the evolution of male reproductive strategies. In this study, we examined the repeatability of sperm morphology and motility measures over three breeding seasons, and we studied relationships between sperm morphology and function. We conducted this study in wild-derived captive house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis). Results for the two species were similar. As predicted from results in other passerine species, total sperm length was highly repeatable across ejaculates, and repeatability for the length of other components was moderate. The repeatability of sperm swimming speed across ejaculates was lower, but statistically significant, suggesting that sperm velocity may be a relatively dynamic trait. Surprisingly, swimming speed did not correlate with the relative length of the midpiece, and it correlated negatively with the relative length of the flagellum and with total sperm length. This pattern is the opposite of what theory predicts and differs from what has been found in house sparrows before. Also contrary to previous work, we found no evidence that total sperm length correlates with sperm longevity. These results therefore highlight the need for a better understanding of relationships between sperm morphology and function in passerine birds. (C) 2014 Wiley Periodicals, Inc. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
sperm morphology, sperm velocity, form-function relationships
in
Journal of Morphology
volume
276
issue
4
pages
370 - 377
publisher
John Wiley & Sons
external identifiers
  • wos:000351735900002
  • scopus:84925115526
ISSN
1097-4687
DOI
10.1002/jmor.20346
language
English
LU publication?
yes
id
a24cbed3-1d72-4bd6-8d28-71895c6bb489 (old id 5277819)
date added to LUP
2015-04-24 09:39:15
date last changed
2017-01-01 06:29:25
@article{a24cbed3-1d72-4bd6-8d28-71895c6bb489,
  abstract     = {Sperm performance is likely to be an important determinant of male reproductive success, especially when females copulate with multiple males. Understanding sperm performance is therefore crucial to fully understand the evolution of male reproductive strategies. In this study, we examined the repeatability of sperm morphology and motility measures over three breeding seasons, and we studied relationships between sperm morphology and function. We conducted this study in wild-derived captive house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis). Results for the two species were similar. As predicted from results in other passerine species, total sperm length was highly repeatable across ejaculates, and repeatability for the length of other components was moderate. The repeatability of sperm swimming speed across ejaculates was lower, but statistically significant, suggesting that sperm velocity may be a relatively dynamic trait. Surprisingly, swimming speed did not correlate with the relative length of the midpiece, and it correlated negatively with the relative length of the flagellum and with total sperm length. This pattern is the opposite of what theory predicts and differs from what has been found in house sparrows before. Also contrary to previous work, we found no evidence that total sperm length correlates with sperm longevity. These results therefore highlight the need for a better understanding of relationships between sperm morphology and function in passerine birds. (C) 2014 Wiley Periodicals, Inc.},
  author       = {Cramer, Emily R. A. and Laskemoen, Terje and Stensrud, Even and Rowe, Melissah and Haas, Fredrik and Lifjeld, Jan T. and Saetre, Glenn-Peter and Johnsen, Arild},
  issn         = {1097-4687},
  keyword      = {sperm morphology,sperm velocity,form-function relationships},
  language     = {eng},
  number       = {4},
  pages        = {370--377},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Morphology},
  title        = {Morphology-Function Relationships and Repeatability in the Sperm of Passer Sparrows},
  url          = {http://dx.doi.org/10.1002/jmor.20346},
  volume       = {276},
  year         = {2015},
}