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Intra- and intermale variability of mature sperm traits analysed in two brackish water populations of the pipefish Syngnathus abaster (Syngnathidae)

Piras, Francesca and Biagi, Francesca and Floris, Antonello and Farina, Vittorio and Zedda, Marco and Franzoi, Piero and Carcupino, Marcella (2015) Intra- and intermale variability of mature sperm traits analysed in two brackish water populations of the pipefish Syngnathus abaster (Syngnathidae). Acta Zoologica (in press). eISSN 1463-6395. Article.

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DOI: 10.1111/azo.12115

Abstract

Sperm cells are highly diversified in animals, and considerable research effort has focused on variation in sperm morphology among species. Surprisingly, little is known about intraspecific variation in sperm morphology. We analysed within- and between-male variation in mature sperm traits in two brackish water populations of the pipefish Syngnathus abaster. Four morphometric parameters, such as the width and length of the head (including nucleus, and midpiece), length of flagellum and total sperm length were taken into account. The differences in all morphometric parameters analysed between populations were not statistically significant. Moreover, the multidimensional scaling analysis shows that (i) the two populations seem to be indistinguishable based on their spermatozoa and (ii) there is not polymorphism, being sperm not distinguishable into discrete classes both within a single male and between males of each populations. The latter datum does not seem to support the presence of polymorphic sperm in syngnathids. Both populations, however, exhibit a high variation in all sperm traits, both among individual sperm within an ejaculate and among males within each population. The relationship between sperm traits variability and the low selection pressure determined by the absence of postcopulatory sexual selection (i.e. absence of sperm competition) is discussed.

Item Type:Article
ID Code:10962
Status:In Press
Refereed:Yes
Uncontrolled Keywords:Morphometric, parasperm, sperm competition
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/01 Anatomia degli animali domestici
Area 05 - Scienze biologiche > BIO/05 Zoologia
Area 07 - Scienze agrarie e veterinarie > VET/04 Ispezione degli alimenti di origine animale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Medicina Veterinaria
Publisher:Blackwell / Wiley
eISSN:1463-6395
Deposited On:27 May 2015 12:55

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