Variation in Reproductive Characteristics of Aquatic Turtles

Gibbons, J. Whitfield; Greene, Judith L.; Patterson, Karen K.

doi:10.2307/1444086

Cited by 89 publications

(55 citation statements)

References 30 publications

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“…Body size strongly affects reproductive output in emydids, primarily acting with a positive relationship with clutch size (e.g., Gibbons et al, 1982;Mitchell, 1985;Congdon & van Loben Sels, 1993). In contrast to Congdon & van Loben Sels (1993), who found no relationship between body size and frequency of reproduction, we found a significant indication of a direct relationship between body size and clutch frequency per female: i.e., the larger the female the higher the clutch frequency.…”

Section: Discussioncontrasting

confidence: 48%

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Double egg‐deposition in the European pond turtle,emys orbicularis,from central Italy

Zuffi

Odetti

1998

Italian Journal of Zoology

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The reproductive condition of Emys orbicularis females (presence or absence of oviductal eggs) was studied by palpation and radiography in a coastal population of central Italy (Tuscany). Forty-nine females were recaptured at least twice during the reproductive period in 1997; 15 of them were found without eggs, 29 reproduced at least once, and 5 reproduced twice. The period of egg retention was estimated to be three to four weeks, and the time between two depositions about 34 days (n = 5). Despite the small sample of females reproducing twice, there is a significant tendency regarding a positive correlation between frequency of reproduction and female body size, within the study population. Reproductive females were bigger than females found without eggs; in addition, carapace length increased significantly in females found zero, one and two times with eggs. A comparison with preliminary data from northern populations of E. orbicularis, lead to the hypothesis that the annual clutch frequency could be negatively related to latitude, the model of this relationship should be still a matter of discussion.KEY WORDS: Emys orbicularis -Double egg-deposition -Frequency of reproduction -Mediterranean coastal habitat. ACKNOWLEDGEMENTS

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Section: Discussioncontrasting

confidence: 48%

“…In addition, within a single population, the fraction of reproductive females may vary between years (Gibbons, 1982). In the study population, females found with oviductal eggs were about 70% of the sample (n = 49), and double reproduction was evident for about 10%.…”

Section: Discussionmentioning

confidence: 94%

Double egg‐deposition in the European pond turtle,emys orbicularis,from central Italy

Zuffi

Odetti

1998

Italian Journal of Zoology

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“…se puede asumir la jerarquía como una estrategia reproductiva que permite mantener disponibles el mayor número posible de folículos, reduciendo las probables perdidas por excesiva y efectiva ovulación, posibilitando la rápida recuperación ovárica, lo que garantizaría una reproducción máxima de las hembras en cada estación con menor inversión energética. tales características pueden incrementarse en función del tamaño de la hembra, como sucede en quelonios, ya que existe relación significativa entre el tamaño de la hembra en el presente estudio la relación entre el tamaño de la hembra y el peso ovárico fue significativa, indicando un mayor crecimiento gonadal, que representa una mayor masa folicular desarrollada y sustenta la relación del tamaño de la nidada y el tamaño de la hembra positivamente, conforme lo exponen para diversas especies de quelonios Brooks et al (1992); Congdon y gibbons (1985);gibbons et al (1982). Claramente se observa en este estudio que el potencial reproductivo está en relación directa con la masa corporal de la hembra.…”

Section: Discussionunclassified

Ciclo ovárico y jerarquía folicular de Peltocephalus dumerilianus (Testudines: Podocnemididae)

Velásquez

Vogt

2011

Acta Amaz.

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Resumén se analizaron cuarenta pares de ovarios de hembras adultas de Peltocephalus dumerilianus (schweigger 1812), para establecer los cambios morfológicos mensuales producidos durante un año. se llevaron a cabo exámenes macroscópicos de los oviductos y de los ovarios de especímenes que los habitantes ribereños del municipio de Barcelos, amazonas, Brasil, utilizaron para su consumo, usando metodológicamente la medida del diámetro y conteo de los folículos ováricos y de los cuerpos lúteos. Los resultados muestran la presencia gradual de folículos acorde con la época reproductiva, resaltando que durante el último tercio del proceso, justo antes de la postura se hacen más evidentes; se analiza la relación existente entre el tamaño de la hembra y la masa ovárica, la cual es estadísticamente significativa (F (10,29)=3,655, p < 0,05). se hace evidente la existencia de una jerarquía ovario folicular que demuestra que para esta especie solo es posible fisiológicamente una postura por año. PalabRas-Clave: Ovarios, folículos, ciclo reproductivo, Peltocephalus dumerilianus, Brasil. Ovarian cycle and follicular hierarchy of Peltocephalus dumerilianus (Testudines: Podocnemididae)abstRaCt Forty pairs of ovaries of mature female Peltocephalus dumerilianus (schweigger 1812) were analyzed, to establish the morphologic monthly changes that take place during one year; we examined macroscopically the oviducts and the ovaries of specimens that the riverside inhabitants of the municipality of Barcelos, amazons, Brazil, used for their consumption. We measured the diameter and recorded the number of enlarged ovarian follicles and corpora lutea. The results show the gradual enlargement of follicles in agreement with the reproductive period, observing that during the last third of the process; just before oviposition they become more evident. The positive relationship between the size of the female and the ovarian mass, is statistically significant (F (10.29)=3.655, p <0.05). Follicullar sizes suggest that this species nests only once a year.

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“…Several studies have analysed the size and age of sexual maturity in female Trachemys in North America, where a wide variation is observed among populations, species and subspecies (Cagle, 1950;Moll and Legler, 1971;Gibbons et al, 1981Gibbons et al, , 1982Gibbons and Greene, 1990;Mitchell and Pague, 1990;Moll and Moll, 1990;Vogt, 1990;Close and Seigel, 1997;Tucker and Warner, 1999;Aresco, 2004). In Trachemys scripta, sexual maturity is influenced mainly by body size rather than age of females (Cagle, 1950;Moll, 1979;Wilbur and Morin, 1988;Gibbons and Greene, 1990).…”

Section: Discussion Female Size and Age At Maturitymentioning

confidence: 99%

The reproductive ecology of exotic Trachemys scripta elegans in an invaded area of southern Europe

Pérez-Santigosa

Díaz‐Paniagua

Hidalgo-Vila

2008

Aquatic Conservation

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ABSTRACT1. The main reproductive parameters of exotic Trachemys scripta elegans in established populations from two ponds in southern Spain are described.2. Females were found to reproduce at 5 years of age, although sexually mature individuals of 4 and 3 years of age were also detected. Annual reproductive frequency was estimated to be 80-86% of reproductive females. Mean clutch size was 11.5 eggs and was not correlated with maternal body size.3. The number of follicles of different size in ovaries suggested that four or more clutches could be laid per season. Eggs were laid from April to June (inclusive) mainly during morning hours, when females were easily detected during nesting trips. 79.5% of eggs were fertile.4. Reproductive parameters of this species in southern Spain were of similar or even higher values than in native areas, thus placing them among chelonian species of earlier maturity.5. Although chelonians might never be considered explosive breeders, the number of T. s. elegans individuals could surpass that of native aquatic chelonians in southern Spain, where T. s. elegans reach maturity earlier, are more fecund and their eggs are more fertile.

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Variation in Reproductive Characteristics of Aquatic Turtles

Cited by 89 publications

References 30 publications

Double egg‐deposition in the European pond turtle,emys orbicularis,from central Italy

Double egg‐deposition in the European pond turtle,emys orbicularis,from central Italy

Ciclo ovárico y jerarquía folicular de Peltocephalus dumerilianus (Testudines: Podocnemididae)

The reproductive ecology of exotic Trachemys scripta elegans in an invaded area of southern Europe

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