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Early social conditions affect female fecundity in hermaphrodites

Articolo
Data di Pubblicazione:
2015
Abstract:
Social conditions experienced prior to sexual maturity influence reproduction later in life in many animals. In simulta- neous hermaphrodites, variation in mating group size influences reproductive investment. As the mating group size increases, re- productive resources devoted to the female function decrease in favor of the male function. Prior to sexual maturity, many her- maphrodites have a protandrous phase during which they produce sperm and can fertilize hermaphrodites’ eggs. In the simulta- neously hermaphroditic polychaete worm Ophryotrocha diadema, the cost of male reproduction during adolescence is spread over the whole energy budget of worms as shown by a reduced growth rate, a delayed age at sexual maturity and the shortening of life span compared to protandrous males that do not reproduce. Little is known on whether social conditions experienced dur- ing development affect reproductive investment of immature individuals. We investigated whether social conditions affected the length of the protandrous phase, body size and also the subsequent female fecundity of same-age protandrous individuals of O. diadema, which did not had to face competition for egg fertilization. Results show that in large group sizes protandrous males lengthened their protandrous phase, slowed down body growth and decreased their individual investment at the first egg laying compared to protandrous males that were reared in isolation. In the successive egg layings worms adjusted their egg output to the current social conditions. We interpreted these results as an indication that early social conditions represent a social stress result- ing in a reduction of the overall reproductive resources up to the first egg laying
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Early experience; Female fecundity; Ophryotrocha diadema; Social environment; Social stress; Animal Science and Zoology
Elenco autori:
Cannarsa, Elio; Lorenzi, Maria Cristina; Sella, Gabriella
Link alla scheda completa:
https://iris.unito.it/handle/2318/1532820
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1532820/74899/Cannarsa%20et%20al%20Early%20social%20conditions%20CZ%202015.pdf
Pubblicato in:
CURRENT ZOOLOGY
Journal
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http://www.currentzoology.org/downloadpdf.asp?filetype=pdf&id=12523
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