Seasonal variations in plasma vitellogenin and sex steroids in male and female Eastern Box Turtles, Terrapene carolina carolina

Currylow, Andrea; Tift, Michael S.; Meyer, Jennifer L.; Crocker, Daniel E.; Williams, Rod N.

doi:10.1016/j.ygcen.2012.11.005

Cited by 21 publications

(13 citation statements)

References 54 publications

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“…Although limited, the sample size of our study is comparable to a previous study on the seasonal variation in reproductive steroids in freshwater turtles (Shelby et al, 2000). It is hypothesised that male yellow-bellied sliders should exhibit a pattern of seasonal testosterone fluctuation as demonstrated in other freshwater turtle and tortoise species involving a dual peak of testosterone: one peak shortly after the hibernating period and another one in fall (Callard et al, 1976;Licht et al, 1985;Shelby et al, 2000;Currylow et al, 2013). Since T0 took place between 1 April and 5 May, the first peak occurred probably before the beginning of the study.…”

Section: Discussionsupporting

confidence: 65%

Effects of deslorelin acetate on plasma testosterone concentrations in captive yellow-bellied sliders (Trachemys scripta sp.)

Potier

Monge

Loucachevsky

et al. 2017

Acta Veterinaria Hungarica

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In Europe, the yellow-bellied slider (Trachemys scripta sp.) is a non-native species in competition with native freshwater turtles. Research on contraception could be useful to control the captive population. Identifying a method of contraception in chelonians would potentially help to control aggression in other chelonian species. The objective of the current study was to evaluate the effects of a single 4.7-mg deslorelin acetate implant on plasma testosterone concentrations in yellow-bellied sliders (Trachemys scripta sp.). Eleven adult male yellow-bellied sliders were used for the study. Males from the treatment group (n = 6) received a 4.7-mg deslorelin acetate implant, whereas males from the control group (n = 5) did not receive any treatment. All individuals were housed under the same environmental conditions. Testosterone plasma concentrations of the control group and the treatment group were measured at six time points (T0-T6) between April and September. No difference between the control group and the deslorelin treatment group was observed at T0, T2, T3, T4, T5 or T6. However, mean plasma testosterone concentration was significantly higher in the treatment group than in the control group at T1. This suggests that treatment with a 4.7-mg deslorelin acetate implant has a transient stimulatory effect on the anterior pituitary in yellowbellied sliders without a negative feedback on testosterone production. Further studies with a higher dosage of deslorelin acetate are needed to draw conclusions on its contraceptive effect.

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Section: Discussionsupporting

confidence: 65%

Effects of deslorelin acetate on plasma testosterone concentrations in captive yellow-bellied sliders (Trachemys scripta sp.)

Potier

Monge

Loucachevsky

et al. 2017

Acta Veterinaria Hungarica

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“…Result of this study showed that Vtg band was detected in blood plasma of mature female (stage I, II, III, and IV), but not detected on male and immature female of striped catfish. Currylow et al (2013) reported that Vtg band was not detected among any male samples of Eastern box turtle Terrapene carolina as negative sample and found Vtg band in female blood plasma as positive sample. Muntaziana et al (2011) revealed that it is difficult to measure the level of Vtg in male and immature fish, but the administration of 17ß-estradiol to male and juvenile teleost evidently induced accumulation of Vtg in the blood.…”

Section: Discussionmentioning

confidence: 97%

Profile of 17ß-estradiol, vitellogenin, and egg diameter during gonad maturation process of striped catfish Pangasianodon hypophthalmus

Pamungkas

Jusadi

Zairin

et al. 2019

Jurnal Akuakultur Indonesia

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This study was conducted to evaluate the profile of 17ß-estradiol (E2) and vitellogenin (Vtg) in plasma and egg diameter during gonad maturity process of striped catfish Pangasianodon hypophthalmus. Blood samples were collected from immature striped catfish, male and female with different stage of gonad maturity (stage I, II, III, and IV) to measure the concentrations of E2 and Vtg. Gonad maturity development of striped catfish was observed based on egg diameter. Result showed that E2 concentrations were the highest (843.65 pg/mL) on female with maturity stage III, the lowest on the male (26.34 pg/mL), and immature female fish (29.37 pg/mL). The protein band of Vtg was obtained on the plasma of the mature female (stage I, II, III and IV) with a molecular weight (MW) between 140−180 kDa, but it was not obtained on immature female dan male striped catfish. The highest concentration of Vtg was found in the plasma of the female fish with maturity stage III (87.34 mg/mL), then on the stage II (74.83 mg/mL), I (68.58 mg/mL), and IV (33.45 mg/mL). It showed that egg yolk formation occurred in the female mature. The average egg diameter was 0.107 ± 0.052 mm, 0.318 ± 0.086 mm, 0.864 ± 0.099 mm, and 1.041 ± 0.058 mm on the maturity stage I, II, III, and IV respectively. The increase of egg diameter along with development of gonad maturity stage indicated that egg development occurred due to the process of vitellogenesis and the addition of egg yolk on oocyte. Keywords : egg diameter, gonad maturity, striped catfish , 17ß–estradiol, vitellogenin ABSTRAK Penelitian dilakukan untuk mengevaluasi profil estradiol-17β (E2), vitelogenin (Vtg) dalam plasma dan diameter telur pada proses pematangan gonad ikan patin siam (Pangasianodon hypophthalmus). Sampel darah untuk pengukuran konsentrasi E2 dan Vtg plasma diperoleh dari ikan patin siam betina yang belum matang gonad, ikan jantan, ikan betina dengan tahap kematangan gonad yang berbeda (tahap I, II, III dan IV). Perkembangan kematangan gonad ikan patin siam diamati berdasarkan diameter telur. Hasil penelitian menunjukkan bahwa konsentrasi E2 tertinggi (843,65 pg/mL) pada ikan betina dengan kematangan tahap III, terendah pada ikan jantan (26,34 pg/mL), dan ikan betina tidak matang gonad (29,37 pg/mL). Pita protein Vtg pada sampel plasma diperoleh dari betina matang gonad (tahap I, II, III dan IV) dengan berat molekul antara 140-180 kDa, tetapi tidak diperoleh pada ikan patin siam betina yang belum dewasa dan jantan. Nilai konsentrasi tertinggi Vtg ditemukan dalam plasma darah ikan betina dengan tingkat kematangan III (87,34 mg/mL) kemudian pada tahap II (74,83 mg/mL), I (68,58 mg/mL) dan IV (33,45 mg/mL). Hal ini menunjukkan bahwa pada ikan betina dewasa terjadi proses pembentukan kuning telur (vitelogenesis). Rata-rata diameter telur adalah 0,107 ± 0,052 mm, 0,318 ± 0,086 mm, 0,864 ± 0,099 mm dan 1,041 ± 0,058 mm pada tingkat kematangan I, II, III dan IV secara berurutan. Peningkatan nilai diameter telur seiring dengan perkembangan tahap kematangan gonad menunjukkan bahwa perkembangan telur terjadi karena proses vitelogenesis dan penambahan bahan kuning telur pada oosit. Kata kunci : diameter telur, 17ß-estradiol, kematangan gonad, patin siam, vitelogenin

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“…Double and triple clutching has often been reported (Ewing 1935;Dickson 1953;Reimer 1981;Jackson 1991;Dodd 1997a;Kipp 2003), and six clutches were laid by a captive female in Louisiana in one year (Messinger and Emydidae -Terrapene carolina 085.11 Patton 1995). Females near the northern limit of their range have not been observed laying multiple clutches in a year (Cook 2004;Willey and Sievert 2012), and this has been confirmed by analyzing hormone levels in a population in Indiana (Currylow et al 2013b).…”

Section: 10mentioning

confidence: 88%

Terrapene carolina (Linnaeus 1758) – Eastern Box Turtle, Common Box Turtle.

Kiester¹,

Willey²

2015

Chelonian Research Monographs

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The Eastern Box Turtle, Terrapene carolina (Family Emydidae), as currently understood, contains six living subspecies of small turtles (carapace lengths to ca. 115-235 mm) able to close their hinged plastrons into a tightly closed box. Although the nominate subspecies is among the most widely distributed and well-known of the world's turtles, the two Mexican subspecies are poorly known. This primarily terrestrial, though occasionally semi-terrestrial, species ranges throughout the eastern and southern United States and disjunctly in Mexico. It was generally recognized as common in the USA throughout the 20th century, but is now threatened by continuing habitat conversion, road mortality, and collection for the pet trade, and notable population declines have been documented throughout its range. In the United States, this turtle is a paradigm example of the conservation threats that beset and impact a historically common North American species. In Mexico, the greatest need for the subspecies that occur there is to further assess their distribution, habitat requirements, economic status, and conservation threats. distRibution.-Canada (extirpated), Mexico, USA. Broadly distributed in eastern and southern USA from southern Maine and New Hampshire to Florida and west to Michigan,

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Seasonal variations in plasma vitellogenin and sex steroids in male and female Eastern Box Turtles, Terrapene carolina carolina

Cited by 21 publications

References 54 publications

Effects of deslorelin acetate on plasma testosterone concentrations in captive yellow-bellied sliders (Trachemys scripta sp.)

Effects of deslorelin acetate on plasma testosterone concentrations in captive yellow-bellied sliders (Trachemys scripta sp.)

Profile of 17ß-estradiol, vitellogenin, and egg diameter during gonad maturation process of striped catfish Pangasianodon hypophthalmus

Terrapene carolina (Linnaeus 1758) – Eastern Box Turtle, Common Box Turtle.

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