scholarly journals Stable isotopes as measure of niche breadth of nesting green turtles (Chelonia mydas) on Rocas Atoll, Brazil

2021 ◽  
Vol 12 (3) ◽  
pp. 82-89
Author(s):  
Karoline Fernanda Ferreira Agostinho ◽  
Leandro Rabello Monteiro ◽  
Carlos Eduardo Veiga de Carvalho ◽  
Ana Paula Madeira Di Beneditto
Keyword(s):  
Stable Isotopes ◽  
Trophic Ecology ◽  
Niche Breadth ◽  
Egg Yolk ◽  
Chelonia Mydas ◽  
Feeding Pattern ◽  
Mean Values ◽  
Green Turtles ◽  
The Mean ◽  
Δ15n And Δ13c

The study analysed the niche breadth of nesting green turtles, Chelonia mydas, on Rocas Atoll, Brazil, through stable isotopes (δ15N and δ13C), comparing samplings of egg yolk and carapace collected from two nesting groups (2017 and 2019). The mean δ15N values in egg yolk and carapace were 7.1‰ (2017) and 6.8‰ (2019), and 7.8‰ (2017) and 7.3‰ (2019), respectively. For δ13C, the mean values were -17.4‰ (2017) and -17.5‰ (2019) in egg yolk, and -18.4‰ (2017) and -17.9‰ (2019) in carapace. The results suggest herbivory in coastal-benthic environments as the main feeding pattern in this nesting population. The niche breadth was similar between 2017 and 2019 in both tissues.  In general, the trophic diversity (NR, CR, CD and SEA) was comparable between years as well as the trophic redundancy (MNND and SDNND), which was overall high. The niche metrics pointed to a homogeneous feeding pattern in the two nesting groups (2017 and 2019). This study adds a piece to solve the puzzle of adult green turtle trophic ecology.

scholarly journals EVALUATION OF WATER HYACINTH (EICHORNIA CRASSIPES) AS FEED INGREDIENT AND YOLK COLOURING AGENT IN LAYERS DIETS.

2021 ◽  
Vol 24 (1) ◽  
Author(s):  
F. A. S. Dairo
Keyword(s):  
Feed Intake ◽  
Water Hyacinth ◽  
Shell Thickness ◽  
Egg Yolk ◽  
Feed Conversion ◽  
Egg Weight ◽  
Mean Values ◽  
Treatment Parameter ◽  
The Mean ◽  
Egg Shell

Sixty-four Black Harco breed of laying hens, 39 weeks in lay were fed water hyacinth Eichhorria crassipes at dietary levels of 0, 5, 10, and 15% for 56 days. The experiment had eight birds in each of the 2 replicates per treatment with the E. crassipes levels of inclusion as treatment. Parameter study include body weight change, feed intake, egg weight, egg yolk coloration, egg shell thickness and feed conversion ratio (feed/kg egg). The mean feed intake significantly decreased (P<0.05) among the mean values of 126.98, 127.27, 127.27 and 122.59 g/day for 0, 5, 10 and 15% inclusion levels respectively. the egg shell thickness increased significantly (P<0.05) among the mean values obtained i.e from 0.51-0.67 mm. however, egg weight changes, egg yolk coloration and feed conversion ration did not show any significant difference (P>0.05) among the respective means. E. crassipes appears to be optimally utilized at 5% dietary level  in layers ration and could be used as pigmenter for egg yolk coloration at this level.

scholarly journals Effect of preservation time on the quality of frozen semen in indigenous rams

2015 ◽  
Vol 44 (1) ◽  
pp. 10-15 ◽  
Author(s):  
BBA Mahmuda ◽  
Azizun Nesa ◽  
BF Zohara ◽  
MGS Alam ◽  
FY Bari
Keyword(s):  
Semen Quality ◽  
Egg Yolk ◽  
Volume Density ◽  
Normal Morphology ◽  
Mean Values ◽  
Frozen Semen ◽  
Significant Difference ◽  
The Mean ◽  
Fresh Semen

The study was carried out to observe the effects of preservation time on the quality of frozen semen of indigenous rams. Semen was collected using AV once a week from 4 rams. Tris based with 10% egg yolk and 7% glycerol extender was used to extend and freezing the semen. Fresh semen was evaluated for volume, density, mass motility and concentration, and mean values were observed as 0.8±0.2ml, 3.0±0.3, 3.2±0.7, 3.9±0.7×109/ml, respectively. Significant difference (p<0.05) was found for all the parameters among the rams. Mean values of motility, viability and normal morphology percentages were 83.3±4.3%, 88.2±4.4%, 84.2±3.5% in fresh semen while those of chilled semen at 40C were 74.7±2.3, 78.8±4.9 and 79.2±2.9%, respectively. For all the parameters, significant (p<0.05) difference was found among the rams. Frozen sperm motility was observed after thawing at 39-400C for 14-15 seconds. The mean motility, viability and normal morphology percentages after freezing for 24hrs, 7, 15 and 30 days of duration were 39.8±3.1, 41.1±4.3, 40.1±4.1 and 39.4±2.9%; 44.5±2.5, 45.3±2.8, 44.6±2.8 and 43.9±2.8%; 71.0±2.0, 71.7±1.5, 70.7±1.7 and 70.3±1.8%, respectively and values did not decrease significantly (p>0.05) with the increasing time of preservation. Non significantly decrease of the semen quality with advance of preservation time indicates the suitability of the protocol used for freezing of indigenous ram semen in Bangladesh.DOI: http://dx.doi.org/10.3329/bjas.v44i1.23113            Bang. J. Anim. Sci. 2014. 44 (1): 10-15

Accumulation of Metals in the Egg Yolk and Liver of Hatchling of Green Turtles Chelonia mydas at Ras Al Hadd, Sultante of Oman

2007 ◽  
Vol 7 (6) ◽  
pp. 925-930 ◽  
Author(s):  
Salim H. Al-Rawahy ◽  
Abdulaziz Y. AlKindi . ◽  
Abdulkadir Elshafie . ◽  
Mahmoud Ibrahim . ◽  
Saif N. Al Bahry . ◽  
...  
Keyword(s):  
Egg Yolk ◽  
Chelonia Mydas ◽  
Green Turtles ◽  
Accumulation Of Metals

scholarly journals The ‘lost years’ of green turtles: using stable isotopes to study cryptic lifestages

2007 ◽  
Vol 3 (6) ◽  
pp. 712-714 ◽  
Author(s):  
Kimberly J Reich ◽  
Karen A Bjorndal ◽  
Alan B Bolten
Keyword(s):  
Stable Isotopes ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Juvenile Stage ◽  
Fish Scales ◽  
Ontogenetic Shift ◽  
Early Juvenile ◽  
Carbon And Nitrogen ◽  
Green Turtles ◽  
Early Juvenile Stage

Ignorance of the location or inaccessible locations of lifestages can impede the study and management of species. We used stable isotopes of carbon and nitrogen to identify the habitats and diets and to estimate the duration of a ‘missing’ lifestage: the early juvenile stage of the green turtle, Chelonia mydas . Stable isotopes in scute from young herbivorous green turtles in shallow-water habitats revealed that they spend 3–5 years as carnivores in oceanic habitats before making a rapid ontogenetic shift in diet and habitat. Stable isotopes in persistent and continuously growing tissues, such as some fish scales, bird bills and claws and mammal hair and claws, can be used to evaluate the ecology of inaccessible lifestages.

scholarly journals Satellite Tracking Reveals Nesting Patterns, Site Fidelity, and Potential Impacts of Warming on Major Green Turtle Rookeries in the Red Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Takahiro Shimada ◽  
Carlos M. Duarte ◽  
Abdulaziz M. Al-Suwailem ◽  
Lyndsey K. Tanabe ◽  
Mark G. Meekan
Keyword(s):  
Success Rate ◽  
Red Sea ◽  
Land Surface ◽  
Census Data ◽  
Chelonia Mydas ◽  
Nesting Success ◽  
Conservation Strategy ◽  
Green Turtles ◽  
The Mean ◽  
Nesting Patterns

Major aggregations of nesting green turtles (Chelonia mydas) occur in the northern Red Sea, although little is known about the reproductive ecology of this endangered species in the region. To address this issue, we satellite-tracked 30 female green turtles to document their movements and to identify factors driving habitat use at two major rookeries in the Red Sea, Jazirat Mashabah (Mashabah Island) and Ras Al Baridi in Saudi Arabia. Between successive nesting events, turtles displayed high fidelity to nesting beaches and adjacent in-water habitats (inter-nesting habitats). Using generalized linear mixed models, we estimated the mean probability of nesting per beach emergence (nesting success rate) to be 0.628, and the mean duration between a successful nesting event and the successive emergence onto the beach (re-nesting interval) to be 10.8 days at each site. The nesting success rate was relatively high (&gt;0.8) when the preceding daytime land surface temperature (LST) was lower than 37°C but decreased with elevated daytime LST (&lt;0.4 when &gt;47°C). Re-nesting interval was longer at lower water temperatures and towards the end of the nesting season of individuals. Our study improves the robustness of abundance estimates from census data (e.g., track counts) and shows that the protection of nesting and inter-nesting habitats during a breeding season would be an effective conservation strategy for the species. We discuss how global warming could increase energy expenditure due to lowered nesting success, ultimately compromising the reproductive fitness of these populations.

scholarly journals The distribution and trophic ecology of an introduced, insular population of red-necked wallabies (Notamacropus rufogriseus)

2018 ◽  
Vol 96 (4) ◽  
pp. 357-365 ◽  
Author(s):  
Paige Havlin ◽  
Anthony Caravaggi ◽  
W. Ian Montgomery
Keyword(s):  
Trophic Ecology ◽  
Niche Breadth ◽  
Lepus Europaeus ◽  
Population Parameters ◽  
Costs And Benefits ◽  
Economic Costs ◽  
European Hare ◽  
The Mean ◽  
Negative Impacts ◽  
Insular Population

Introduced non-native mammals can have negative impacts on native biota and it is important that their ecologies are quantified so that potential impacts can be understood. Red-necked wallabies (Notamacropus rufogriseus (Desmarest, 1817)) became established on the Isle of Man (IOM), an island with UNESCO Biosphere status, following their escape from zoological collections in the mid-1900s. We estimated wallaby circadial activity and population densities using camera trap surveys and random encounter models. Their range in the IOM was derived from public sightings sourced via social media. Wallaby diet and niche breadth were quantified via microscopic examination of faecal material and compared with those of the European hare (Lepus europaeus Pallas, 1778). The mean (±SE) population density was 26.4 ± 6.9 wallabies/km2, the mean (±SE) population size was 1742 ± 455 individuals, and the species’ range was 282 km2, comprising 49% of the island. Wallaby diets were dominated by grasses, sedges, and rushes; niche breadth of wallabies and hares (0.55 and 0.59, respectively) and overlap (0.60) suggest some potential for interspecific competition and (or) synergistic impacts on rare or vulnerable plant species. The IOM wallaby population is understudied and additional research is required to further describe population parameters, potential impacts on species of conservation interest, and direct and indirect economic costs and benefits.

Trace elements and stable isotopes in egg yolk of green turtles on Rocas Atoll, Brazil

2020 ◽  
pp. 111821
Author(s):  
Karoline Fernanda Ferreira Agostinho ◽  
Inácio Abreu Pestana ◽  
Carlos Eduardo Veiga de Carvalho ◽  
Ana Paula Madeira Di Beneditto
Keyword(s):  
Stable Isotopes ◽  
Trace Elements ◽  
Egg Yolk ◽  
Green Turtles

scholarly journals The Concurrent Detection of Chelonid Alphaherpesvirus 5 and Chelonia mydas Papillomavirus 1 in Tumoured and Non-Tumoured Green Turtles

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 697
Author(s):  
Narges Mashkour ◽  
Karina Jones ◽  
Wytamma Wirth ◽  
Graham Burgess ◽  
Ellen Ariel
Keyword(s):  
East Coast ◽  
Chelonia Mydas ◽  
Molecular Evidence ◽  
Marine Turtles ◽  
Viral Loads ◽  
Green Turtles ◽  
Group A ◽  
The Mean ◽  
Benign Tumours ◽  
Group B

Characterised by benign tumours, fibropapillomatosis (FP) is a debilitating disease that predominantly afflicts the endangered green turtle (Chelonia mydas). A growing body of histological and molecular evidence has associated FP tumours with Chelonid alphaherpesvirus 5 (ChHV5). However, a recent study which detected both ChHV5 and Chelonia mydas papillomavirus 1 (CmPV1) DNA in FP tumour tissues has challenged this hypothesis. The present study aimed to establish a probe-based qPCR to assess the wider prevalence of CmPV1 and co-occurrence with ChHV5 in 275 marine turtles foraging in waters adjacent to the east coast of Queensland, Australia: three categories: Group A (FP tumours), Group B (non-tumoured skin from FP turtles) and Group C (non-tumoured skin from turtles without FP). Concurrent detection of ChHV5 and CmPV1 DNA is reported for all three categories, where Group A had the highest rate (43.5%). ChHV5 viral loads in Group A were significantly higher than loads seen in Group B and C. This was not the case for CmPV1 where the loads in Group B were highest, followed by Group A. However, the mean CmPV1 load for Group A samples was not significantly different to the mean load reported from Group B or C samples. Collectively, these results pivot the way we think about FP; as an infectious disease where two separate viruses may be at play.

Characteristics and freezability of Assam Hill goat semen

2017 ◽  
Author(s):  
S. Deori ◽  
B. C. Deka ◽  
R. K. Biswas ◽  
N. Nahardeka ◽  
A. Arangasamy ◽  
...  
Keyword(s):  
Sperm Motility ◽  
Sperm Concentration ◽  
Egg Yolk ◽  
Mean Values ◽  
Acceptable Quality ◽  
Sperm Abnormality ◽  
Semen Characteristics ◽  
The Mean ◽  
Live Sperm

Assam Hill goat (AHG) is an important goat germplasm found in Assam and its adjoining areas of India. The study was designed with an objective to study the semen characteristics and freezability of AHG buck semen using Tris -Egg yolk-Citrate-Fructose diluent. The mean values of fresh semen characteristics in AHG bucks viz., ejaculate volume (ml), initial sperm motility (%), sperm concentration (x106/ml), live sperm (%), sperm abnormality (%), HOST-reacted sperm (%) and intact acrosome (%) recorded were 0.39 ± 0.01, 77.97 ± 0.73, 3201.00 ± 143.78, 83.02 ± 0.65, 7.66 ± 0.73, 66.95 ± 0.74 and 93.34 ± 0.51, respectively. Mean values for post-thaw semen characteristics i.e., sperm motility (%), live sperm (%), HOST-reacted sperm (%) and intact acrosome (%) were 55.39 ± 0.97, 71.01 ± 0.78, 54.77 ± 0.55 and 82.16 ± 0.43, respectively. It can be concluded that AHG bucks donate acceptable quality of semen which can be frozen successfully in Tris-Egg yolk-Citrate-Fructose diluents for using in Artificial Insemination.

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