Effect of Pituitary Extracts on the Spermatogenesis of the Green Frog Rana Hexadactyla Lesson

Kasinathan, Sivakanthan; Basu, Samar

doi:10.1507/endocrj1954.19.59

Cited by 3 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar results were also obtained in anurans, e.g. in males of the frogs Rana esculenta (Chieffi et al 1975), Rana hexadactyla (Kasinathan et al 1978) and Rana nigromaculata (Kobayashi and Iwasawa 1984), and in females of R. esculenta (Pierantoni et al 1983). Adams and Rae (1929) noticed that unilateral excision of a fat body only affected gametogenesis in the ipsilateral gonad, gametogenesis pro-ceeding normally within the contralateral gonad.…”

Section: Introductionsupporting

confidence: 57%

Effect of Fat Body Excision in Female Bufo bufo on the Ipsilateral Ovary, with a Discussion of Fat Body‐Gonad Relationships

Jørgensen¹

1986

Acta Zoologica

View full text Add to dashboard Cite

show abstract

Section: Introductionsupporting

confidence: 57%

Effect of Fat Body Excision in Female Bufo bufo on the Ipsilateral Ovary, with a Discussion of Fat Body‐Gonad Relationships

Jørgensen¹

1986

Acta Zoologica

View full text Add to dashboard Cite

show abstract

“…follicular maturation, spermatogenesis, behavioural activities) during the time when energy intake is absent or minimal. Further, experimental studies in ranid anurans have also supported a functional link between lipid stores and vitellogenesis (Rana cyanophlyctis: Prasadmurthy and Saidapur 1987, Rana tigrina: Saidapur and Hoque 1996, Girish and Saidapur 2000 and testicular activity (R. hexadactyla: Kasianthan et al 1978). Considering the difference between sexes in the timing of the main energetic investments into reproduction in most temperate zone anurans, i.e.…”

Section: Discussionmentioning

confidence: 91%

“…However, the risk of encountering ''bad conditions'', making foraging and energy gathering problematic (e.g. Further, experimental studies in ranid anurans have also supported a functional link between lipid stores and vitellogenesis (Rana cyanophlyctis: Prasadmurthy and Saidapur 1987, Rana tigrina: Saidapur and Hoque 1996, Girish and Saidapur 2000 and testicular activity (R. hexadactyla: Kasianthan et al 1978). Further, northern R. temporaria have more pronounced iteroparous life histories, with longer life spans and lower yearly reproductive effort (Miaud et al 1999, Hettyey et al 2005.…”

Section: Discussionmentioning

confidence: 99%

Sexual patterns of prebreeding energy reserves in the common frog Rana temporaria along a latitudinal gradient

et al. 2009

View full text Add to dashboard Cite

The ability to store energy is an important life history trait for organisms facing long periods without energy income, and in particular for capital breeders such as temperate zone amphibians, which rely on stored energy during reproduction. However, large scale comparative studies of energy stores in populations with different environmental constraints on energy allocation are scarce. We investigated energy storage patterns in spring (after hibernation and before reproduction) in eight common frog Rana temporaria populations exposed to different environmental conditions along a 1600 km latitudinal gradient across Scandinavia (range of annual activity period is 3Á7 months). Analyses of lean body weight (eviscerated body mass), weight of fat bodies, liver weight, and liver fat content, showed that 1) post-hibernation/prebreeding energy stores increased with increasing latitude in both sexes, 2) males generally had larger energy reserves than females and 3) the difference in energy stores between sexes decreased towards the north. Larger energy reserves towards the north can serve as a buffer against less predictable and/or less benign weather conditions during the short activity period, and may also represent a risk-averse tactic connected with a more pronounced iteroparous life history. In females, the continuous and overlapping vitellogenic activity in the north may also demand more reserves in early spring. The general sexual difference could be a consequence of the fact that, at the time of our sampling, females had already invested their energy into reproduction in the given year (i.e. their eggs were already ovulated), while the males' main reproductive activities (e.g. calling, mate searching, sexual competition) occurred later in the season.Acquisition and expenditure of energy are important factors affecting life history variation. In fact, different life history strategies largely arise by the different ways organisms allocate the available energy among maintenance, growth, defence and reproduction. An important aspect of energy acquisition and expenditure is how these are temporally related. For example, energetic expenditures of reproduction can be supported by simultaneous energy uptake (income breeders) or by using stored energy that was gathered in advance (capital breeders sensu Stearns 1992 and Jönsson 1997; see also Drent and Daan 1980 for the original formulation of the capital and income breeding concepts). Long-term energy storage and continuous energy intake without storage are not mutually exclusive, and a range of different strategies, from pure capital breeding at one end, through mixed strategies, to pure income breeding at the other end is possible. Energy storage might also be energetically costly (Jönsson 1997), although for ectothermic animals the effect could be minimal (Bonnet et al. 1998). The function of energy stores is often to allow organisms to reproduce, or to survive over periods when feeding is constrained for one reason or another (e.g. absence of food, harsh environmenta...

show abstract

Effect of pituitary extracts on the hypophysial gonadotrophes and its relation to the spermatogenesis in Rana hexadactyla Lesson

1974

View full text Add to dashboard Cite

Pituitary extracts from 560 mature Ku.n.u h.exadactylu of both sexes from winter and summer seasons were collected locally and were injccted into frogs from summer and winter months. The adenohypophysial gonadotrophes were studied from normal animals and from thc animals injected wjth pituitary extracts. The pituitary cell types changed in experimental frogs in comparison to the corresponding cells of normal animals. An attempt has been made to correlate the changes of gonadotrophes with changes in spermatogcnetic proliferation as reported earlicr (Kasinathaii and Basu, '72).

show abstract

Effect of Pituitary Extracts on the Spermatogenesis of the Green Frog Rana Hexadactyla Lesson

Cited by 3 publications

References 5 publications

Effect of Fat Body Excision in Female Bufo bufo on the Ipsilateral Ovary, with a Discussion of Fat Body‐Gonad Relationships

Effect of Fat Body Excision in Female Bufo bufo on the Ipsilateral Ovary, with a Discussion of Fat Body‐Gonad Relationships

Sexual patterns of prebreeding energy reserves in the common frog Rana temporaria along a latitudinal gradient

Effect of pituitary extracts on the hypophysial gonadotrophes and its relation to the spermatogenesis in Rana hexadactyla Lesson

Contact Info

Product

Resources

About