A marine and a freshwater species of Chaetonotida (Gastrotricha) were reared under laboratory conditions. Their life tables and principal demographic parameters were determined at 2 different temperatures (20"and 25'C). At 25'C the data relative to the marine species were collected from 5 cohorts kept at 5 different salinity levels (15, 25, 35, 45, 557..). A higher temperature increases reproductive activity while shortening its duration in both species, whereas the length of the lifespan remains unaffected.Extreme salinity values (15 and 55'/".) reduce the maximum longevityof the marine species and have opposite effects on reproductive activity,which is higher at low salinity and becomes lower at high salinity. Thepostparthenogenetic phase is remarkably long relative to the life cycle: thiswas observed in all experimental conditions and may be related to the existenceof a second reproductive phase, which is hermaphroditic and followsthe parthenogenetic one, as recently postulated from morphological data.

Life history traits of two chaetonotids (Gastrotricha) under different experimental conditions / Balsamo, M.; Todaro, Mary Antonio Donatello. - In: INTERNATIONAL JOURNAL OF INVERTEBRATE REPRODUCTION AND DEVELOPMENT. - ISSN 0168-8170. - STAMPA. - 14:(1988), pp. 161-176.

Life history traits of two chaetonotids (Gastrotricha) under different experimental conditions

TODARO, Mary Antonio Donatello
1988

Abstract

A marine and a freshwater species of Chaetonotida (Gastrotricha) were reared under laboratory conditions. Their life tables and principal demographic parameters were determined at 2 different temperatures (20"and 25'C). At 25'C the data relative to the marine species were collected from 5 cohorts kept at 5 different salinity levels (15, 25, 35, 45, 557..). A higher temperature increases reproductive activity while shortening its duration in both species, whereas the length of the lifespan remains unaffected.Extreme salinity values (15 and 55'/".) reduce the maximum longevityof the marine species and have opposite effects on reproductive activity,which is higher at low salinity and becomes lower at high salinity. Thepostparthenogenetic phase is remarkably long relative to the life cycle: thiswas observed in all experimental conditions and may be related to the existenceof a second reproductive phase, which is hermaphroditic and followsthe parthenogenetic one, as recently postulated from morphological data.
14
161
176
Life history traits of two chaetonotids (Gastrotricha) under different experimental conditions / Balsamo, M.; Todaro, Mary Antonio Donatello. - In: INTERNATIONAL JOURNAL OF INVERTEBRATE REPRODUCTION AND DEVELOPMENT. - ISSN 0168-8170. - STAMPA. - 14:(1988), pp. 161-176.
Balsamo, M.; Todaro, Mary Antonio Donatello
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/459308
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