A Comparative Study of the Extracutaneous Pigmentary System in Three Anuran Amphibian Species Evaluated During the Breeding Season

2009 ◽  
Vol 4 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Rafaela Maria Moresco ◽  
Classius De Oliveira
Keyword(s):  
Comparative Study ◽  
Breeding Season ◽  
Amphibian Species ◽  
Anuran Amphibian

Comparative study of oestrous activity in Finn ewes and two Egyptian fat-tailed sheep under subtropical conditions

1985 ◽  
Vol 105 (2) ◽  
pp. 469-473 ◽  
Author(s):  
A. M. Aboul-Naga ◽  
M. B. Aboul-Ela ◽  
Ferial A. Hassan
Keyword(s):  
Comparative Study ◽  
Breeding Season ◽  
Individual Variation ◽  
Cycle Length ◽  
Normal Cycle

SUMMARYOestroua activity of three flocks of Ossimi (O) and Rahmani (R) subtropical fattailed and imported Finn (F) ewes was followed over a calendar year under the prevailing subtropical conditions in Egypt.Rahmani had quite consistent oestrous activity throughout the year, with a slight drop in March and June, and may be regarded as a non-seasonal breed. Oestrous activity of the O ewes was lower than the R at different times of the year. They showed high individual variation. Most of the O ewes had an anoestroua period during July–September but had regular oestrous activity during their breeding season.Overall number of oestruses per ewe per year was 15·9, 13·0 and 10·3 for R, O and F, respectively. Normal cycle length tended to be longer, though not significantly so, in both R and O subtropical breeds than the F (17·8 and 17·6 v. 17·1 days). Heat duration was significantly longer in F (47·0 h) than in both local breeds (37·7 and 37·5 h for R and O, respectively).

scholarly journals Safety Bubbles: A Review of the Proposed Functions of Froth Nesting among Anuran Amphibians

Ecologies ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 112-137
Author(s):  
John Gould
Keyword(s):  
Aquatic Systems ◽  
Optimal Conditions ◽  
Egg Development ◽  
Amphibian Species ◽  
Environmental Challenges ◽  
Anuran Amphibian ◽  
Anuran Amphibians

The adults of several anuran amphibian species deposit their eggs externally in mucus secretions that are purposely aerated to produce a froth nest. This type of clutch structure has evolved independently several times in this group and has been proposed to serve a variety and often simultaneous adaptive functions associated with protecting offspring from sub-optimal conditions during embryogenesis and later stages after hatching has occurred. These functions range from buffering offspring from sub-optimal temperatures and desiccation, to defending against predation and improving oxygenation. This versatility has likely helped facilitate the reduced reliance of egg development on water and thus the penetration of anurans into environments where permanent aquatic systems are not always available. In this paper, I review the hypothesised functions of the anuran froth nest as a mucus-based solution to the environmental challenges offspring face during development, with consideration of the functions of froth nest breakdown and communal froth nesting, as well.

A comparative study of the deacetylation of paracetamol by urodele and anuran amphibian organ cultures

Xenobiotica ◽  
1981 ◽  
Vol 11 (3) ◽  
pp. 149-157 ◽  
Author(s):  
R. H. Clothier ◽  
Jane R. Dewar ◽  
Maria Ana Santos ◽  
A. D. North ◽  
Susan Foster ◽  
...  
Keyword(s):  
Comparative Study ◽  
Organ Cultures ◽  
Anuran Amphibian

COMPARATIVE EFFECTS OF pH AND VISION® HERBICIDE ON TWO LIFE STAGES OF FOUR ANURAN AMPHIBIAN SPECIES

2004 ◽  
Vol 23 (4) ◽  
pp. 815 ◽  
Author(s):  
Andrea N. Edginton ◽  
Patrick M. Sheridan ◽  
Gerald R. Stephenson ◽  
Dean G. Thompson ◽  
Herman J. Boermans
Keyword(s):  
Life Stages ◽  
Amphibian Species ◽  
Anuran Amphibian ◽  
Effects Of Ph

scholarly journals Comparative Study Between Different Methods of Insemination in Iraqi Does

2011 ◽  
Vol 35 (2) ◽  
pp. 95-104
Author(s):  
HA . AL-Mutar
Keyword(s):  
Comparative Study ◽  
Pregnancy Rate ◽  
Breeding Season ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Experimental Animals ◽  
Pregnant Mare Serum Gonadotropin ◽  
Abdominal Palpation ◽  
Serum Gonadotropin ◽  
In Pregnancy

Present experimental was carried out on 22 does 2-4 years old. The aim was to induction of estrous in non-breeding season using impregnated sponge with 20 mg of medroxy progesterone acetate (MPA) for 13 days and with an i/m injection of 500 IU Pregnant Mare Serum Gonadotropin (PMSG) hormone 24 hrs before sponge withdrawal and to compare the pregnancy rate using three different methods of insemination; natural , cervical and laparoscopic artificial insemination at fixed time 24-48 hrs after estrous onset. All does were showed signs of estrous (100%), the estrous time was 46.9±4.90hrs (24-60hrs) after sponge withdrawal. While estrous length was 37.09±1.91 (24–72hrs). All experimental animals followed up by abdominal palpation, ultrasonography at 30, 60 and 90 days post-insemination, while the laparoscopic examination was performed at day 30 post-insemination, to improve the efficiently of the different methods of inseminations in pregnancy rate ultrasonographical diagnosed by rectal and abdominal methods of 14 does post-inseminations appeared that two were pregnant, seven suspected and five non pregnant. At day 60th , post-insemination the pregnancy diagnosis of (22) does appeared that (14) were pregnant, six suspected and two non pregnant. While at day 90, the examination of all does appeared that (16) animals were pregnant and six were not. The laparoscopic examination, at 30 days post-insemination showed that eight does were pregnant, two suspected and two were not pregnant. In conclusion that the pregnancy rate of laparoscopic insemination is (75%), comparisons to natural (66.7%) and cervical AI method (75%) but there is no significant different between them, while the kidding percentage was appear in natural insemination (75%), cervical (100%) and laparoscopic insemination (150%). The results of this study indicate that estrus can be efficiently induced in female goats during non-breeding season using 20mg MPA impregnated spongewith 500IU PMSG.

Locality, time and heterozygosity affect chytrid infection in yellow-bellied toads

2020 ◽  
Vol 142 ◽  
pp. 225-237
Author(s):  
P Oswald ◽  
A Rodríguez ◽  
J Bourke ◽  
N Wagner ◽  
N de Buhr ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Breeding Season ◽  
Batrachochytrium Dendrobatidis ◽  
Infection Intensity ◽  
Sampling Period ◽  
Infection Prevalence ◽  
Infection Status ◽  
Population Declines ◽  
Amphibian Species ◽  
High Genetic Diversity

The chytrid fungus Batrachochytrium dendrobatidis (Bd) infects numerous amphibian species worldwide and is suggested to drive population declines and extinction events. We report a study of Bd infection at the northernmost distribution of the European yellow-bellied toad Bombina variegata. A total of 577 individuals from ponds in 16 study sites were sampled for DNA and Bd throughout the breeding season. Microsatellite genotyping revealed 3 genetic clusters for the host B. variegata with an overall low genetic diversity. One of the clusters displayed a low microsatellite heterozygosity, a high inbreeding coefficient as well as high Bd infection prevalence and intensities. Multi-model estimates identified site, time of sampling, and heterozygosity to be important predictors of an individual’s Bd infection status, and identified a strong effect of site on individual Bd infection intensity. The study site effects are suggestive of localized infection peaks, and the increase of individual Bd infection probabilities towards the end of the sampling period suggests cumulative infection during the breeding season. This study highlights the need for regular monitoring of Bd infection variables at multiple localities and times to gain insights into Bd dynamics. Due to the detected relationship between individual Bd infection status and heterozygosity, conservation measures should focus on the maintenance of high genetic diversity and connectivity within and among amphibian populations.

scholarly journals A comparative study of Ural Owl Strix uralensis breeding season diet within its European breeding range, derived from nest box monitoring schemes

Bird Study ◽  
2018 ◽  
Vol 65 (sup1) ◽  
pp. S85-S95 ◽  
Author(s):  
Al Vrezec ◽  
Pertti Saurola ◽  
Andris Avotins ◽  
Stiven Kocijančič ◽  
Seppo Sulkava
Keyword(s):  
Comparative Study ◽  
Breeding Season ◽  
Nest Box ◽  
Breeding Range ◽  
Ural Owl

A comparison of reproduction in two chipmunk species (Eutamias)

1969 ◽  
Vol 47 (4) ◽  
pp. 603-608 ◽  
Author(s):  
David H. Sheppard
Keyword(s):  
Comparative Study ◽  
Breeding Season ◽  
Litter Size ◽  
Reproductive Potential

Eutamias amoenus and E. minimus are potential competitors in western Alberta. The former species has larger litters and reproduces at an earlier age, on an average, than the latter. Other aspects of reproduction (breeding season, prenatal mortality) do not appear to differ greatly, though supporting data are somewhat inadequate. The higher reproductive potential should confer an advantage on amoenus in competition with minimus. The observed difference in litter size of these two congeners seems to be best explained by a difference in available food in the two habitats. This hypothesis should be tested by a comparative study of the energetics of the two species populations.

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