scholarly journals The Female Reproductive Cycle of the Bedriaga Plate-Tailed Gecko,Teratoscincus bedriagai(Sauria: Gekkonidae) in Iran

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Fatemeh Mojibi ◽  
Vida Hojati
Keyword(s):  
Reproductive Cycle ◽  
Reproductive System ◽  
Reproductive Activity ◽  
Eastern Desert ◽  
Central Plateau ◽  
Oocyte Growth ◽  
Adult Females ◽  
Significant Difference ◽  
Desert Regions ◽  
Semnan Province

The Bedriaga Plate-tailed Gecko,Teratoscincus bedriagaiNikolsky, 1900, is distributed in the northern and eastern desert basins of the Central Plateau of Iran, Sistan, and the desert regions of southern Afghanistan. Iranian specimens are believed to be rare in collections. In this study, the reproductive cycle of this species has been investigated through focusing on oogenesis from 5 April to 5 August, 2013. Generally, 15 adult females were collected by hand at midnight from southern parts of Damghan County, situated in Semnan Province of Iran. Ovaries were removed and processed for the purpose of histological and morphometric studies. The results revealed that oocyte growth starts in early April and terminates in late July. Moreover, mating commences in spring, especially at the beginning of May, with oviposition occurring from late May to late July. Approximately, 1 to 2 eggs are laid by females per clutch with the possibility of producing a secondary clutch later in the season. The maximum reproductive activity takes place in May and continues with a decreasing trend in June and more reduction in July and finally ends in August. No significant difference was observed between right and left side of reproductive system. Therefore, oogenesis occurs from April to July, whileT. bedriagaifollows an oogenic cycle typical for temperate species.

scholarly journals The Male Reproductive Cycle of the Spotted Toad-Headed Agama,Phrynocephalus maculatus, in Iran

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Soheila Rahmani ◽  
Vida Hojati
Keyword(s):  
Reproductive Cycle ◽  
Arid Regions ◽  
Tunica Albuginea ◽  
Reproductive Activity ◽  
Seminal Vesicles ◽  
Adult Males ◽  
Germinal Layer ◽  
Histological Studies ◽  
The Right ◽  
Semnan Province

The spotted toad-headed agama,Phrynocephalus maculatus, distributed in the central and southeastern arid regions of Iran, belongs to the Agamidae family. In this research, the male reproductive cycle of this species was studied from 5 April to 5 August, 2013. Totally, 40 adult males were collected at midday from southern deserts of Damghan County, located in Semnan Province of Iran. Testes were removed and processed for morphometric and histological studies. The spermatogenic cycle begins from early April, mating occurs in mid-May, and it ends in August. Maximum reproductive activity occurs in early June and reduces from early July and ends in August. The numbers of seminal vesicles were 33–127 and their diameter varied between 69.0 and 258.3 microns. The diameter of tunica albuginea varied between 3.0 and 8.1 microns. The diameter of germinal layer varied between 10.0 and 110.0 microns. There were significant differences in macroscopic and microscopic testicular characters between months. Also, there were no significant differences in the testicular and hemipenal characters between the left side and the right side of body. Since spermatogenesis occurs from April through August,P. maculatusfollows an associated reproductive cycle typical for temperate species.

scholarly journals Female reproductive cycle of the snaked-eyed Lizard Ophisops elegans Ménétriés, 1832 (Reptilia: Lacertidae) from Lebanon

2019 ◽  
Author(s):  
Fida Nassar ◽  
Souad Hraoui-Bloquet
Keyword(s):  
Body Size ◽  
Clutch Size ◽  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Reproductive Activity ◽  
Male Adult ◽  
Female Body Size ◽  
Significant Difference ◽  
Ophisops Elegans ◽  
Female Reproductive Cycle

We studied the female reproductive cycle of a population of Ophisops elegans lizard from the herpetology collection of the Natural History Museum of the Lebanese University. Females collected during spring and summer showed vitellogenesis in their ovaries with oviposition occurring from May to July followed by a subsequent quiescent period. They produced up to two clutches. Mean clutch size was 3.2 ± 1, range 2-5 eggs. Clutch size was independent of female body size. The smallest female attaining sexual maturity had a snout vent length of 45 mm. Sexual maturity can be attained within one year of age. We found no significant difference in body size between female and male adult lizards. Seasonal variations in the reproductive activity of females were well synchronized with those of males. 

Annual Reproductive Activity and Morphology of the Reproductive System of an Andean Population of Atractus (Serpentes, Colubridae)

2019 ◽  
Vol 14 (1) ◽  
pp. 58
Author(s):  
Luis Eduardo Gualdrón-Durán ◽  
María Fernanda Calvo-Castellanos ◽  
Martha Patricia Ramírez-Pinilla
Keyword(s):  
Reproductive System ◽  
Reproductive Activity ◽  
Andean Population

scholarly journals Determination of Efficacy of Single and Double 4.7 mg Deslorelin Acetate Implant on the Reproductive Activity of Female Pond Sliders (Trachemys scripta)

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 660
Author(s):  
Edoardo Bardi ◽  
Martina Manfredi ◽  
Raffaella Capitelli ◽  
Emanuele Lubian ◽  
Alessandro Vetere ◽  
...  
Keyword(s):  
Phase Ii ◽  
Egg Production ◽  
Reproductive Activity ◽  
Trachemys Scripta ◽  
Phase Iii ◽  
Control Group ◽  
Sexual Hormones ◽  
Significant Difference ◽  
Group 6 ◽  
Plasmatic Concentration

The use of long-acting gonadotropin-releasing hormone (GnRH) agonists to suppress fertility has been poorly investigated in reptiles, and the few available studies show inconsistent results. The efficacy of single and double intramuscular 4.7 mg deslorelin acetate implants in captive pond sliders (Trachemys scripta) was investigated, with 20 animals divided into three groups: a single-implant group (6 animals), a double-implant group (6 animals), and a control group (no implant). During one reproductive season (March to October), plasmatic concentration of sexual hormones (estradiol, progesterone, and testosterone) and ovarian morphometric activity via computed tomography were monitored about every 30 days. A significative decrease in the number of phase II ovarian follicles was detected in the double-implant group compared with the control group, but no significant difference was noted in the number of phase III and phase IV follicles, egg production, and plasmatic concentration of sexual hormones. Results show that neither a single nor a double deslorelin acetate implant can successfully inhibit reproduction in female pond sliders during the ongoing season, but the lower number of phase II follicles in the double-implant group can possibly be associated with reduced fertility in the following seasons.

scholarly journals FEEDING AND REPRODUCTIVE ACTIVITY OF THE COPEPODS Drepanopus forcipatus AND Calanus australis DURING LATE SUMMER ON THE SOUTHERN PATAGONIAN SHELF (ARGENTINA, 47°-55°S)

2014 ◽  
Vol 62 (4) ◽  
pp. 295-314 ◽  
Author(s):  
Julieta Carolina Antacli ◽  
Marina E. Sabatini ◽  
Ricardo I. Silva ◽  
Daniel R. Hernández ◽  
Andrés J. Jaureguizar ◽  
...  
Keyword(s):  
Diet Composition ◽  
Feeding Activity ◽  
Food Pellet ◽  
Late Summer ◽  
Reproductive Activity ◽  
Seasonal Temperature ◽  
Patagonian Shelf ◽  
Adult Females ◽  
Female Reproductive Status ◽  
Potential Food

Drepanopus forcipatus and Calanus australis are key planktonic copepods on the southern Patagonian shelf. Their feeding and reproductive patterns and population status were investigated during late summer, when environmental conditions may be critical. The presence of food in the gut and food-pellet length were recorded in adult females and the most abundant copepodite stages. Diet composition was also studied in adult females. Female reproductive status was evaluated by gonad staging. Despite generally low feeding conditions and decreasing seasonal temperature, both copepods fed to some degree. The most numerous copepodites and adult females of both species showed similarly low feeding activity. About half of the adult females of the two species and C5s of C. australis contained food in their guts, but the proportion of fed C4-females of D. forcipatus was much lower. All copepods were generally feeding at low or intermediate levels. Gonad stage distribution and population structure showed low but still ongoing reproduction in both species. Gut content findings suggest a preference for smaller nanoplanktonic particles, especially dinoflagellates by D. forcipatus, and for autotrophic prey, particularly large diatoms by C. australis. The feeding and reproduction patterns of the two copepods were likely influenced by the distributions of potential food resources and temperature.

scholarly journals Actividad reproductiva y dieta de Hemidactylus frenatus (Sauria: Gekkonidae) en el norte de Colombia

2017 ◽  
Vol 57 (36) ◽  
pp. 459
Author(s):  
Jorge A. Díaz-Pérez ◽  
Alcides C. Sampedro-Marín ◽  
Martha P. Ramírez-Pinilla
Keyword(s):  
Diet Composition ◽  
Sampling Period ◽  
Reproductive Activity ◽  
Climatic Conditions ◽  
Relative Importance ◽  
Adult Males ◽  
Adult Females ◽  
Ecological Aspects ◽  
Environmental Availability ◽  
Hemidactylus Frenatus

Despite its success as an invasive species, little is known about the ecological aspects of the gekkonid lizard Hemidactylus frenatus in Colombia. In the present study the size at maturity, sexual dimorphism, reproductive activity, and diet composition of a population of this species in an urban locality of Northern Colombia were determined. We conducted eleven samplings from September 2011 to August 2012 in buildings of the municipality of Sincelejo. A total of 264 specimens H. frenatus were captured, 112 were adult females, 133 adult males and 19 juveniles. Males reach sexual maturity at a smaller size (snout-vent length) than females (males: 35.7 mm; females: 42.7 mm), also they are larger and have proportionally larger heads and mouths than females. Males were reproductive throughout the year; although testicular volume varied significantly between samples, this variation was not associated with body size and precipitation in the study area. Reproductive adult females were found during all the sampling period. Females have an invariable clutch size of two eggs and we found no differences in the diameter and weight of eggs in each oviduct. The diet of H. frenatus is varied, with Diptera, Hemiptera and Formicidae being the prey types with the greatest relative importance values. Individuals of both sexes consume a similar volume and number of prey. Thus, the studied population of H. frenatus has continuous reproductive activity and a generalist-opportunistic feeding behavior. The climatic conditions of the study area, environmental availability of prey and intrinsic features of this species appear to be responsible for their abundance and colonizing success in this and other localities.

An Evaluation of the Hypothesis that Females Are More Susceptible than Males to Lead-induced Haematological Alterations

1989 ◽  
Vol 8 (2) ◽  
pp. 105-109
Author(s):  
R. Ken ◽  
E.J. Calabrese ◽  
R.W. Tuthill
Keyword(s):  
Blood Lead ◽  
Cell Parameters ◽  
Adult Females ◽  
Significant Difference ◽  
Lead Levels ◽  
Human Adults ◽  
Males And Females ◽  
Published Research ◽  
Lead Poisoning Prevention ◽  
Poisoning Prevention

1 A retrospective epidemiological study was conducted to assess the hypothesis that sex differences exist with respect to selected lead-induced red blood cell parameters. The study utilized data previously collected in the Boston Childhood Lead Poisoning Prevention Program. 2 This study revealed no statistically significant difference between males and females ( n = 1548) aged 1-6 years for blood FEP levels when blood lead levels were similar. 3 These findings are in contrast with previously published research with human adults, which has suggested that adult females display significantly greater FEP values at identical blood level values as similarly aged men.

Assessment of Stylosanthes seed yield reduction caused by phytoplasma-associated diseases

2002 ◽  
Vol 42 (8) ◽  
pp. 1053 ◽  
Author(s):  
S. J. De La Rue ◽  
R. Hopkinson ◽  
K. S. Gibb
Keyword(s):  
Seed Yield ◽  
Reproductive Activity ◽  
Yield Reduction ◽  
Research Station ◽  
Initial Symptom ◽  
Symptom Expression ◽  
Yield Data ◽  
Leaf Disease ◽  
Significant Difference ◽  
Stylosanthes Scabra

The effect of Stylosanthes little leaf disease on Stylosanthes scabra cv. Seca seed yield was monitored over 2 consecutive seasons at Southedge Research Station in northern Queensland. The time of initial symptom expression was recorded during weekly assessments to determine what effect time of infection after planting had on seed yield. First flowering date was recorded to establish whether the developmental stage of the plant, as indicated by the onset of reproductive activity, at the time of symptom expression influenced the effect of Stylosanthes little leaf disease on yield. At the end of each season, both diseased and asymptomatic plants were harvested and seed yield determined. Seed yield data from the 1999 season showed that there was no significant difference between the mean yield of symptomatic plants, regardless of when they first showed symptoms, and that of asymptomatic plants. However, during the 2000 season plants that showed symptoms early in the season had a significantly lower seed yield than both asymptomatic plants and plants that became diseased later in the season. This decrease in productivity amounted to a yield loss of 98.8 and 56.5% when the plants showed symptoms at 79�and 110 days, respectively, after planting. If plants became diseased within 30 days of first flowering, they did not produce significant amounts of seed. Yield remained low even when the time between first flowering and initial symptom expression increased up to 60 days, after which yield was extremely variable but within the range of that observed for individual asymptomatic plants. It is concluded that Stylosanthes little leaf disease has little or no effect on seed yield if plants have been flowering for about 8 weeks before symptom expression.

100 Reproductive cycle and pregnancy monitoring in the common hippopotamus (Hippopotamus amphibius) through salivary steroid analyses and transabdominal ultrasonography

2019 ◽  
Vol 31 (1) ◽  
pp. 176
Author(s):  
J. Wojtusik ◽  
I. M. C. Brandicourt ◽  
W. Rice ◽  
T. L. Roth
Keyword(s):  
Enzyme Immunoassay ◽  
Reproductive Cycle ◽  
Reproductive Activity ◽  
Botanical Garden ◽  
Ex Situ ◽  
Sample Collection ◽  
Transabdominal Ultrasonography ◽  
Hippopotamus Amphibius ◽  
Steroid Analysis ◽  
The Common

The common hippopotamus (Hippopotamus amphibius) is listed as vulnerable to extinction by the IUCN due to a significant decrease in population size, caused by habitat loss and poaching. Ex situ populations can help ensure against species loss, but careful reproductive management is essential to maintain sustainable populations. Hormone monitoring allows for characterisation of the reproductive cycle and gestation, offering insight into timing of receptivity and conception and facilitating pregnancy diagnosis and estimation of parturition date. Fecal steroid analysis has been validated for measuring progestogens in hippos. However, hippos are often housed in groups and frequently defecate in the water, making sample collection and source identification difficult. Salivary steroid analysis has been employed for monitoring reproductive activity in several species, but has not been tested in hippos. Additionally, transabdominal ultrasonography has proven valuable in diagnosing and monitoring pregnancy in many large mammals, but efficacy in the common hippo is unknown. The goals of this project were to (1) validate the use of an enzyme immunoassay to monitor progestogens in hippo saliva, (2) confirm that salivary progestogen profiles accurately reflect reproductive activity, (3) determine if transabdominal ultrasonography can be used to diagnose pregnancy, and, if so, (4) monitor and characterise fetal development via weekly examinations. Saliva (4-7 per week) and fecal (2-7 per week) samples were collected from 7 adult female hippos housed at 3 USA facilities over 3-7 months. Saliva and fecal samples were extracted in ethanol and extracts diluted (1:2 to 1:10 and 1:25 to 1:500, respectively) before evaluation by enzyme immunoassay (Progesterone mini-kit; Arbor Assays). Parallelism was confirmed between serially diluted fecal (r2=0.993) and saliva (r2=0.990) samples and the standard curve. Inter- and intra-assay coefficients of variation were maintained at <10%. Comparison of fecal and saliva progestogen concentrations revealed a strong correlation between the 2 sample types (r2=0.848) and suggested that saliva offers a comparable alternative. Both fecal and saliva extracts exhibited elevated progestogens during luteal phases and gestation. One nulliparous female housed at the Cincinnati Zoo & Botanical Garden (Cincinnati, OH, USA) was trained for voluntary transabdominal ultrasound exams. An Ibex Pro portable ultrasound machine (E.I. Medical Imaging, Loveland, CO, USA) with curvilinear probe (5-2.5MHz) was used at a scanning depth of 17.8 and 23.4cm. Intrauterine fluid and possible fetal tissue were observed 79 days following the last confirmed mating. Spine, rib cage, and beating heart were clearly visible at ~156 days of gestation. Ultrasound procedures were continued until the premature birth of a calf at ~181 days (normal hippo gestation ~231 days). Salivary progestogen monitoring and transabdominal ultrasonography appear suitable for tracking reproductive activity and diagnosing and monitoring pregnancy in the common hippo.

The identity of the invasive yellow-striped terrestrial planarian found recently in Europe: Caenoplana variegata (Fletcher & Hamilton, 1888) or Caenoplana bicolor (Graff, 1899)?

Zootaxa ◽  
2020 ◽  
Vol 4731 (2) ◽  
pp. 193-222
Author(s):  
HUGH D JONES ◽  
EDUARDO MATEOS ◽  
MARTA RIUTORT ◽  
MARTA ÁLVAREZ-PRESAS
Keyword(s):  
United Kingdom ◽  
Reproductive System ◽  
Sexual Maturity ◽  
Junior Synonym ◽  
The United Kingdom ◽  
Significant Difference ◽  
Before And After ◽  
Yellow Stripe ◽  
Anatomical Information ◽  
Over Time

Terrestrial planarians with a dorsal yellow stripe and dark lateral surfaces and up to 15-20 cm long have been found in several countries in Europe, the earliest in 2008. They are similar to two species originally from Australia, Caenoplana variegata (Fletcher & Hamilton, 1888) and C. bicolor (Graff, 1899), both described on external characters only, with no anatomical information. Careful reading suggests that there is no significant difference between the original descriptions. Further: observations on live specimens show considerable variation between individuals and in individuals over time and before and after feeding, negating any distinction between descriptions. Examination of three sectioned specimens shows considerable difference in sexual maturity, though one seems almost fully mature and the reproductive system is described. Molecular results show that specimens from the United Kingdom and Spain are of the same species. It is concluded that the planarians should be referred to as C. variegata, C. bicolor being a junior synonym. 

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