Reproduction of Omalonyx matheroni (Gastropoda: Succineidae) under laboratory conditions

Montesori, Lângia; Teixeira, Ana; Paglia, Adriano; Vidigal, Teofânia

dc.creator	Montesori, Lângia
dc.creator	Teixeira, Ana
dc.creator	Paglia, Adriano
dc.creator	Vidigal, Teofânia
dc.date	2012-11-29
dc.date.accessioned	2016-05-03T15:29:29Z
dc.date.available	2016-05-03T15:29:29Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/3913
dc.identifier	10.15517/rbt.v60i2.3913
dc.identifier.uri	https://hdl.handle.net/10669/26670
dc.description	The life histories of succineids have received relatively little attention. To evaluate life history char- acteristics of Omalonyx matheroni, we studied a Brazilian population (Reserva Particular do Patrimônio Natural Feliciano Miguel Abdala, in Caratinga, Minas Gerais, Brazil) under laboratory conditions. The aims of the present study were (1) to describe in detail an appropriate rearing method; (2) to investigate the effects of different temperature and photoperiod conditions; and (3) to assess the effects of self and cross-fertilization on the repro- ductive biology of these mollusks. We studied the oviposition site, the time to sexual maturity and the influences of photoperiod and temperature on reproductive parameters of O. matheroni reared under laboratory conditions. We tested three combinations of temperature and photoperiod, designated A, B and C (A: 25oC, 24 hours of light; B: environmental conditions of temperature and photoperiod, characterized as follows: average maximum temperature=27.1oC, average minimum temperature=18.3oC, average day length=12.06 hours; and C: 25oC, zero hours of light) and two rearing densities (I: isolated and G: grouped) on reproductive parameters (number of eggs per egg mass, number of unviable eggs per mass, egg mass incubation period, and duration of the hatching period). A total of 186 individuals and 565 egg masses were studied. Data were analyzed by Student’s t-test, two-way ANOVA and Chi-Square test. Eight generations were produced (March/2004-March/2006), from 35 field specimens, 91% of 3 197 eggs hatched. The time to sexual maturity was approximately three months for individuals reared in groups or in isolation (Student’s t-test: t=1.41, df=31, p=0.16); however, they dif- fered significantly in weight (Student’s t-test: t=3.6, df=31, p<0.001). Regarding the influences of temperature and photoperiod on reproductive parameters, under natural environmental conditions, individuals produced a greater number of eggs per mass (ANOVA: F2,573=84.15, p<0.001), with a longer incubation period (ANOVA: F2;559=170.05, p<0.001). The extreme photoperiod conditions of 24 hours of light or zero hours of light likely imposed stress and could be related to the significant reductions in the number of eggs per mass, and egg incu- bation period as well as the increased synchrony in egg hatching. No correlations were observed between the number of unviable eggs per mass and the temperature, photoperiod (ANOVA: F2,573=0.87, p=0.92) or rearing density (ANOVA: F1,573=0.21, p=0.64). Individuals reared in isolation under natural conditions produced more eggs per mass and did not presented any disadvantage with respect to the variables analyzed as compared to the animals reared in groups. These results indicate that O. matheroni can successfully reproduce by selfing.	en-US
dc.description	En vista de que las historias de vida de los Succineidae han recibido relativamente poca atención, se estudio una población de Omalonyx matheroni, de Brasil (Reserva Privada y Patrimonio Natural Feliciano Miguel Abdala, en Caratinga, Minas Gerais, Brazil), en condiciones de laboratorio. Los objetivos de este trabajo fueron: (1) describir una metodología para el cultivo en laboratorio de Omalonyx matheroni; (2) investigar los efectos de diferentes condiciones de temperatura y fotoperíodo en su cultivo y, (3) verificar los efectos de la autofecundación y de la fecundación cruzada en la biología reproductiva de estos moluscos. Se estudiaron 186 individuos y 565 masas de huevos. La edad de madurez sexual fue aproximadamente de tres meses, igual para los animales aislados que para los que estuvieron en grupo (Student’s t-test: t=1.41, df=31, p=0.16). En condiciones más cercanas a la naturaleza se presentaron más huevos por masa (ANOVA: F2,573=84.15, p<0.001) y un tiempo más largo de eclosión (ANOVA: F2,559=170.05, p<0.001). En condiciones más extremas, debido probablemente al estrés producido por las mismas, se observó una reducción en el número de huevos por masa, en el tiempo de incubación y una eclosión más sincrónica. No se encontró una correlación entre el número de huevos inviables y las condiciones de temperatura y fotoperíodo (ANOVA: F2,573=0.87, p=0.92) y la densidad de cultivo (ANOVA: F1,573=0.21, p=0.64). Animales en aislamiento se reprodujeron con éxito lo que muestra la capacidad que tiene O. matheroni para la autofecundación.	es-ES
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 60 (2) June 2012	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 60 (2) June 2012	es-ES
dc.source	Revista Biología Tropical; Vol. 60 (2) June 2012	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v60i2
dc.subject	reproduction	en-US
dc.subject	life history	en-US
dc.subject	mollusk	en-US
dc.subject	temperature	en-US
dc.subject	photoperiod	en-US
dc.subject	laboratory maintenance	en-US
dc.subject	reproducción	es-ES
dc.subject	historia de vida	es-ES
dc.subject	molusco	es-ES
dc.subject	fotoperíodo	es-ES
dc.subject	temperatura	es-ES
dc.subject	mantenimiento en laboratorio	es-ES
dc.title	Reproduction of Omalonyx matheroni (Gastropoda: Succineidae) under laboratory conditions	en-US
dc.title	Reproduction of Omalonyx matheroni (Gastropoda: Succineidae) under laboratory conditions	es-ES
dc.type	artículo original

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