Histological findings of sperm storage in green turtle (Chelonia mydas) oviduct

AbstractGreen turtles (Chelonia mydas) are seasonal breeders with a time lag between mating and nesting periods. We therefore investigated whether female turtles store sperm like some other animals by histologically and ultrastructurally analyzing oviducts collected from three mature female free-ranging green turtles during the breeding season in the Ogasawara Islands, Japan. The oviduct comprised an infundibulum, magnum, isthmus, uterus, and vagina. Sperm was found in the isthmus of all turtles examined. Some spermatozoa were found in the duct and acini of glands in the isthmus of two turtles with oviducts containing eggs, and a few were also located in the transition area between the uterus and vagina of one of the turtles. On the other hand, we also found abundant spermatozoa on the luminal surface of the isthmus of one turtle captured during mating. In most reptiles, fertilization occurs in the infundibulum or albumen region, and thus the isthmus near those areas might be suitable for storing sperm in female turtles.

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Estimation of temporal changes in the growth of green turtles Chelonia mydas in waters around the Ogasawara Islands

Fisheries Science ◽

10.1007/s12562-009-0095-z ◽

2009 ◽

Vol 75 (3) ◽

pp. 629-639 ◽

Cited By ~ 5

Author(s):

Eiji Tanaka

Keyword(s):

Chelonia Mydas ◽

Temporal Changes ◽

Green Turtles ◽

Ogasawara Islands

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Insights on Immune Function in Free-Ranging Green Sea Turtles (Chelonia mydas) with and without Fibropapillomatosis

Animals ◽

10.3390/ani11030861 ◽

2021 ◽

Vol 11 (3) ◽

pp. 861

Author(s):

Justin R. Perrault ◽

Milton Levin ◽

Cody R. Mott ◽

Caitlin M. Bovery ◽

Michael J. Bresette ◽

...

Keyword(s):

Natural Killer Cell ◽

Concanavalin A ◽

Lymphocyte Proliferation ◽

Natural Killer Cell Activity ◽

Killer Cell ◽

Cell Activity ◽

Chelonia Mydas ◽

Green Turtles ◽

Killer Cell Activity ◽

Free Ranging

Chelonid alphaherpesviruses 5 and 6 (ChHV5 and ChHV6) are viruses that affect wild sea turtle populations. ChHV5 is associated with the neoplastic disease fibropapillomatosis (FP), which affects green turtles (Chelonia mydas) in panzootic proportions. ChHV6 infection is associated with lung-eye-trachea disease (LETD), which has only been observed in maricultured sea turtles, although antibodies to ChHV6 have been detected in free-ranging turtles. To better understand herpesvirus prevalence and host immunity in various green turtle foraging aggregations in Florida, USA, our objectives were to compare measures of innate and adaptive immune function in relation to (1) FP tumor presence and severity, and (2) ChHV5 and ChHV6 infection status. Free-ranging, juvenile green turtles (N = 45) were captured and examined for external FP tumors in Florida’s Big Bend, Indian River Lagoon, and Lake Worth Lagoon. Blood samples were collected upon capture and analyzed for ChHV5 and ChHV6 DNA, antibodies to ChHV5 and ChHV6, in vitro lymphocyte proliferation using a T-cell mitogen (concanavalin A), and natural killer cell activity. Despite an overall high FP prevalence (56%), ChHV5 DNA was only observed in one individual, whereas 20% of turtles tested positive for antibodies to ChHV5. ChHV6 DNA was not observed in any animals and only one turtle tested positive for ChHV6 antibodies. T-cell proliferation was not significantly related to FP presence, tumor burden, or ChHV5 seroprevalence; however, lymphocyte proliferation in response to concanavalin A was decreased in turtles with severe FP (N = 3). Lastly, green turtles with FP (N = 9) had significantly lower natural killer cell activity compared to FP-free turtles (N = 5). These results increase our understanding of immune system effects related to FP and provide evidence that immunosuppression occurs after the onset of FP disease.

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Renal oxalosis in free-ranging green turtles Chelonia mydas

Diseases of Aquatic Organisms ◽

10.3354/dao01913 ◽

2008 ◽

Vol 80 ◽

pp. 45-49 ◽

Cited By ~ 7

Author(s):

BA Stacy ◽

M Santoro ◽

JA Morales ◽

LM Huzella ◽

VF Kalasinsky ◽

...

Keyword(s):

Chelonia Mydas ◽

Green Turtles ◽

Free Ranging

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Bacteraemia in free-ranging Hawaiian green turtles Chelonia mydas with fibropapillomatosis

Diseases of Aquatic Organisms ◽

10.3354/dao053041 ◽

2003 ◽

Vol 53 ◽

pp. 41-46 ◽

Cited By ~ 40

Author(s):

TM Work ◽

GH Balazs ◽

M Wolcott ◽

R Morris

Keyword(s):

Chelonia Mydas ◽

Green Turtles ◽

Free Ranging

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Pengaruh Kedalaman Sarang Penetasan Penyu Hijau (Chelonia mydas) terhadap Masa Inkubasi dan Persentase Keberhasilan Penetasan di Pantai Sukamade, Taman Nasional Meru Betiri, Banyuwangi Jawa Timur [Effect of Nesting Site Depth of Green Turtle (Chelonia mydas) on the Incubation Period and Hatching Success Percentage in Sukamade Beach, Meru Betiri National Park, Banyuwangi in East Java]

Jurnal Ilmiah Perikanan dan Kelautan ◽

10.20473/jipk.v7i2.11206 ◽

2019 ◽

Vol 7 (2) ◽

pp. 195

Author(s):

Abang Aldhian R. Putera ◽

Laksmi Sulmartiwi ◽

Wahju Tjahjaningsih

Keyword(s):

Incubation Period ◽

Green Turtle ◽

National Park ◽

Hatching Success ◽

Sea Turtles ◽

Chelonia Mydas ◽

The Other ◽

Green Turtles ◽

Egg Incubation ◽

Range Test

Abstract Indonesia is an archipelago that is rich in diversity of flora and fauna. One of these is a wealth of fauna species of sea turtles. All species of sea turtles in the world by the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES) put in Appendix I as endangered and protected and not allowed to be traded. The purpose of this study was to determine effect the ratio of the depth from nest egg incubation and hatching percentage of green turtles (Chelonia mydas) nests at different depths in Sukamade, Betiri Meru National Park, Banyuwangi, East Java. The design of the study is a randomized block design (RGD). The groups as replicates for RGD, between groups or experimental material media are considered uniform. The results showed that the average incubation period was 58.87 +0.39 days, then the results were followed by Duncan's multiple range test, which showed that the highest yield obtained by the depth of 50 cm wasn’t significantly different (p> 0.05) with depth of 30 cm and 70 cm. While the results obtained at the lowest depth of 90 cm was significantly different (p <0.05) with the other depth (30 cm, 50 cm and 70 cm). While the percentage of hatching success obtained in average hatching was 88.12 + 0.38%. The Duncan's multiple range test analysis, showed that at a depth of 70 cm were not significantly different (p <0.05) from depth of 50 cm, but 70 and 50 cm depth was significantly different (p> 0.05) from another depth. Whereas the lowest hatching results obtained on depth of 90 cm are significantly different (p> 0.05) from the other depth (30 cm, 50 cm and 70 cm). The conclusion of this study was different depth of green turtle nests affect the egg incubation period and the percentage of egg hatching success of green turtles.

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COMPARISON OF HEMATOLOGICAL, PLASMA BIOCHEMICAL, AND NUTRITIONAL ANALYTES OF REHABILITATING AND APPARENTLY HEALTHY FREE-RANGING ATLANTIC GREEN TURTLES (CHELONIA MYDAS)

Journal of Zoo and Wildlife Medicine ◽

10.1638/2017-0250 ◽

2019 ◽

Vol 50 (1) ◽

pp. 69 ◽

Cited By ~ 2

Keyword(s):

Chelonia Mydas ◽

Green Turtles ◽

Free Ranging ◽

Apparently Healthy

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Further Studies of the Sea-Finding Mechanism in Green Turtle Hatchlings

Behaviour ◽

10.1163/156853974x00192 ◽

1974 ◽

Vol 51 (3-4) ◽

pp. 195-208 ◽

Cited By ~ 10

Author(s):

Sara J. Shettleworth ◽

N. Osovsky

Keyword(s):

Visual Field ◽

Green Turtle ◽

Chelonia Mydas ◽

The Other ◽

Green Turtles ◽

Visual Inputs ◽

Simultaneous Comparison ◽

Temporal Field ◽

Different Parts ◽

Made In

AbstractFurther studies were made of the simultaneous comparison mechanism used by hatchling green turtles, Chelonia mydas, in sea-finding behaviour. The aim was to learn if visual inputs from different directions, stimulating different parts of the retina, had the same effects on orientation. To do this goggles were designed that permitted occlusion of parts of the visual field. Wearing goggles did not in itself affect orientation. When the nasal visual field for one eye and the temporal field for the other eye were covered, turtles circled consistently in the direction of the eye with the nasal occlusion. The total numbers of circles made in a given time by such turtles were not significantly different from those made by animals with simple unilateral blindfolds. Covering the temporal field of one eye resulted in some, though not all, turtles turning contralateral to that eye, provided the other eye was totally covered. On the whole the data were consistent with the idea that inputs in the nasal field are associated with contralateral turning and those in the temporal field with ipsilateral turning. Some complications to this interpretation are also discussed. However, the results demonstrate unequivocally that inputs from different directions contribute differently to sea-finding orientation of green turtles.

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Avrupa’ya Türk göçü: Almanya örneği

GÖÇ DERGİSİ ◽

10.33182/gd.v1i1.547 ◽

2014 ◽

Vol 1 (1) ◽

pp. 47-56

Author(s):

Milan Palat

Keyword(s):

Network Theory ◽

Quantitative Methods ◽

Positive Relationship ◽

Time Lag ◽

Theoretical Concept ◽

Living Standards ◽

The Other ◽

The European Union ◽

Effective Mechanism ◽

The Eu

Bu çalışmanın amacı, Türkiye’den göç ve Almanya’nın ekonomik göstergeleri arasındaki ilişkiyi, nicel metot yöntemleri kullanarak değerlendirmektir. Türkiye’nin belirsiz Avrupa ile bütünleşme beklentilerine rağmen Avrupa Birliğinin köklü üyelerine olan Türk göçü devam edecektir. Çok sayıda Türk azınlığın yaşadığı ve hayat standartlarının yüksek olduğu Almanya, Hollanda ve Fransa’ya büyük bir göç dalgası gerçekleşebilir. Çalışmanın istatistiksel bölümünün sonuçları, toplam göç ile gayri safi yurtiçi hasıladaki büyüme arasında pozitif, toplam göç ile işsizlik arasındaki negatif ve tahmin edilen bağımlılık yönüyle uygunluk içerisinde olan toplam göç ile aylık gelir arasında pozitif ilişki olduğunu göstermektedir. Türkiye’den göçle işsizlik arasındaki ilişki, toplam göçle olan ilişkiden daha düşüktür. Ancak, Almanya’daki yabancı mevcudiyeti ile Türkiye’den göç arasında bir ilişki bulunmaktadır. Bu durum, var olan göçmen topluluğunun olduğu yerin, yeni göçmenleri, köken bağlarına dayanarak cezbetmesi ve maliyet- riskler sebebiyle göçün düşük seviye de olduğuna dayanan kuramsal Ağ teorisi görüşü ile uygunluk göstermektedir. Göç ve işsizlik arasında gözlenen ilişki, Almanya’ya göçün işgücü piyasasında talepte meydana gelen değişime karşılık geldiği gerçeğini göstermektedir. İşsizlik ve göç olgularının meydana geliş zamanlarında bir aralık olsa bile göç, Alman emek pazarında var olan dengesizliklerin azaltılmasında nispeten etkili bir mekanizma gibi görünmektedir. ENGLISH TITLE & ABSTRACTTurkish Immigration to the European Union: The Case of GermanyThe objective of the paper was to evaluate the relationships between immigration from Turkey and economic indicators in Germany using quantitative methods. Despite Turkey’s unclear European integration prospects, it is predicted that Turkish immigration to established member countries of the EU will continue. The strongest waves may flow to Germany, Netherlands or France, where numerous Turkish minorities are already present and where the living standards are high. Results from the statistical analysis of the paper showed a positive correlation between immigration total and the growth of gross domestic product. On the other hand, a negative correlation of immigration total and unemployment was found and a positive relationship between immigration total and income total which is in agreement with the expected dependency direction. With regards to immigration from Turkey it is less correlated to unemployment than immigration total. But there is a correlation between immigration from Turkey and the stock of foreigners in Germany This is in accordance with the theoretical concept of network theory where an existing community of migrants keeps attracting new migrants because the costs and risks associated with migration are lower, thanks to established linkages to the country of origin. The observed correlation of migration and unemployment points to the fact that immigration to Germany responds to changes in demand in the labour market. Even though a time lag may occur in the case of unemployment and immigration, migration appears to be a relatively effective mechanism to offset existing imbalances in German labour markets.

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