Mating behaviour in the leopard seal, Hydrurga leptonyx (Mammalia : Phocidae), in captivity

1967 ◽  
Vol 15 (1) ◽  
pp. 1 ◽  
Author(s):  
BJ Marlow
Keyword(s):  
Mating Behaviour ◽  
Leopard Seal ◽  
Natural Conditions ◽  
The Past ◽  
Marine Predators ◽  
Hydrurga Leptonyx ◽  
In Captivity ◽  
The Antarctic ◽  
Zoological Park ◽  
Head Neck

Observations are given on courtship, vocalization, and copulation in the leopard seal, Hydrurga leptonyx, in captivity. Copulation was observed on November 30, 1965 and January 29, 1966 by members of the staff of Taronga Zoological Park, Sydney. This act has not previously been recorded in this species and the exact time of mating under natural conditions is unknown. The female was found dead in the enclosure which it shared with the male, and had severe lacerations, which were presumably inflicted by the latter, on the head, neck, and body. These wounds did not seem sufficiently severe to have caused its death and it was not possible to determine the cause of death from post mortem examination. The wounds bore a marked resemblance to injuries described on other seals in the Antarctic and it is suggested that such damage, which has in the past been attributed to other marine predators, may have been inflicted by leopard seals.

scholarly journals Summer circumpolar acoustic occurrence and call rates of Ross, Ommatophoca rossii, and leopard, Hydrurga leptonyx, seals in the Southern Ocean

Polar Biology ◽  
2021 ◽  
Vol 44 (2) ◽  
pp. 433-450
Author(s):  
Fannie W. Shabangu ◽  
Tracey L. Rogers
Keyword(s):  
Southern Ocean ◽  
Austral Summer ◽  
Call Rate ◽  
Leopard Seal ◽  
Survey Techniques ◽  
Pack Ice ◽  
Hydrurga Leptonyx ◽  
Spatio Temporal ◽  
The Antarctic ◽  
Temporal Overlap

Abstract Two of the Antarctic pack ice seals, Ross, Ommatophoca rossii, and leopard, Hydrurga leptonyx, seals, are extremely difficult to study via traditional visual survey techniques, yet are ideal for an acoustic survey as they are highly vociferous and produce an array of underwater sounds during the austral summer. To determine their acoustic occurrence in the Antarctic pack ice, we use their calls, detected within 680 acoustic recordings made between 1999 and 2009 as part of two multinational programmes. Siren calls of Ross seals were detected mainly in January, and 9.88 calls per minute from low siren calls was the highest call rate for this species. High numbers of Ross seal calls were detected close to the ice edge in areas between 0° and 20° E and 60° and 130° E, suggesting these are important summer habitats. Leopard seal calls were detected mainly in December and January, and December had the highest percentage of calls. Call rate of 11.93 calls per minute from low double trills was the highest call rate for leopard seals. Leopard seal calls were detected throughout the Southern Ocean with more calls detected throughout the pack ice. There was little spatio-temporal overlap in call occurrence of Ross and leopard seals, but both species were more vocally active during the day. Longitude and latitude were the most important predictors of Ross seal occurrence, and month of the year highly predicted leopard seal occurrence. This is the first study to examine the circumpolar acoustic occurrence of Ross and leopard seals in the Southern Ocean pack ice.

scholarly journals Cross-fostering between two species of marmosets (Callithrix jacchus and Callithrix penicillata)

1998 ◽  
Vol 58 (4) ◽  
pp. 665-669 ◽  
Author(s):  
R. F. GUERRA ◽  
E. TAKASE ◽  
C. V. SANTOS
Keyword(s):  
Environmental Effects ◽  
Food Preference ◽  
Callithrix Jacchus ◽  
Reproduction Rate ◽  
Natural Conditions ◽  
In Captivity ◽  
Cross Fostering

Cross-fostering technique can be defined as adoption of infants by adults of other species. This phenomenon is poorly investigated because very young animals have few opportunities to interact peacefully with non-conspecific adults, either in captivity or in natural conditions. This study describes the induction of cross-fostering in captivity between white tufted-ear (Callithrix jacchus) and black tufted-ear marmosets (Callithrix penicillata). We conclude that this technique can be very useful for preserving the life of rejected by parents or orphan infants, mainly in the case of species with low reproduction rate in captivity or those threatened by extinction, as well for investigating the environmental effects on the typical behavior of species (courtship, food preference, vocalization patterns, e.g.).

scholarly journals Longevity of Lion-tailed Macaque (Macaca silenus) in captivity at Nandankannan Zoological Park, Bhubaneswar

2002 ◽  
Vol 17 (8) ◽  
pp. 861-861
Author(s):  
L.N. Acharjyo ◽  
Vinod Kumar ◽  
S.K. Patnaik
Keyword(s):  
Macaca Silenus ◽  
In Captivity ◽  
Zoological Park

scholarly journals Whales as Indicators of Historical and Current Changes in the Marine Ecosystem of the Indo-Pacific Sector of the Antarctic

2020 ◽  
Author(s):  
Yoshihiro Fujise ◽  
Luis A. Pastene
Keyword(s):  
Marine Ecosystem ◽  
Recruitment Rate ◽  
Minke Whale ◽  
Past Century ◽  
Baleen Whale ◽  
The Past ◽  
Antarctic Minke Whale ◽  
Minke Whales ◽  
Nutritional Conditions ◽  
The Antarctic

We review the scientific information on whales that could be indicative of historical and current changes in the ecosystem in the Indo-Pacific sector of the Antarctic. The increased krill availability in the middle of the past century as a result of the heavy harvesting of the larger baleen whale species could have been translated into better nutritional conditions for the Antarctic minke whale, resulting in a decreasing trend in the age at sexual maturity and an increasing trend in recruitment rate and hence total population size between approximately 1940 and 1970. This nutritional condition has deteriorated more recently, as revealed by a decrease in energy storage and stomach content weight since the 1980’s; these changes coincide with appreciable increases in the abundances of humpback and fin whales, which were heavily harvested in the first half of the past century. The historical demographic changes observed in the Antarctic minke whale are consistent with the pattern to be expected under the krill surplus hypothesis, with minke whales now again competing with other (recovering) baleen whale species for krill. However, these minke whales could also be using alternative feeding areas (e.g. polynias within the pack-ice) in response to the increase in abundance and geographical expansion of these other large whale species. This could provide an alternative explanation for indications from sighting surveys and population models of a decrease and then re-stabilisation of minke whale abundance in open water areas since the 1970s.

Head and Neck Synovial Cell Sarcoma

1992 ◽  
Vol 107 (5) ◽  
pp. 631-637 ◽  
Author(s):  
Finn R. Amble ◽  
Kerry D. Olsen ◽  
Antonio G. Nascimento ◽  
Robert L. Foote
Keyword(s):  
Synovial Cell ◽  
Surgical Excision ◽  
Metastatic Tumor ◽  
Neck Mass ◽  
Surgical Removal ◽  
Cell Sarcoma ◽  
The Past ◽  
Synovial Cell Sarcoma ◽  
Head Neck

Our experience with 14 patients treated for synovial cell sarcoma during the past 30 years is described. These tumors were manifested in young people whose ages ranged from 12 to 43 years. The diagnosis of synovial cell sarcoma proved difficult because approximately one third of the patients initially received incorrect pathologic diagnoses. A painless neck mass was the most common presenting symptom. Initial treatment included surgical excision in five patients and surgical excision and radiation therapy in nine. Recurrent or metastatic tumor occurred from 4 months to 62 months later; thus, long-term followup is important. Four of the nine patients who were followed more than 5 years died of their disease. Favorable prognostic findings included early diagnosis and the performance of wide surgical removal. (Otolaryngol head neck surg 1992;107:631.)

scholarly journals Past and current evidence of persecution of the Endangered crowned eagle Harpyhaliaetus coronatus in Argentina

Oryx ◽  
2006 ◽  
Vol 40 (3) ◽  
pp. 347-350 ◽  
Author(s):  
José Hernán Sarasola ◽  
Juan José Maceda
Keyword(s):  
Causes Of Death ◽  
Current Evidence ◽  
Future Research ◽  
Conservation Action ◽  
Field Surveys ◽  
The Past ◽  
Central Argentina ◽  
Water Trough ◽  
Educational Programmes ◽  
In Captivity

The crowned eagle Harpyhaliaetus coronatus is a large Neotropical eagle categorized as Endangered throughout its range. However, the threats to this species are poorly understood. We present data on the causes of death of crowned eagles in semi-arid forests of La Pampa province, central Argentina. Data was obtained from field surveys and from interviews with 62 local landowners during 1999–2004. Over this period five eagles were shot, one killed by a car, one was found dead in a cattle water trough, and one was found in captivity. From the interviews information was obtained about a further 10 cases of eagles being shot, disturbed or trapped. Five (13%) of 38 interviewed landowners who positively identified the species admitted having killed or disturbed eagles in the past but only two (5%) mentioned predation of eagles upon livestock as a problem. Persecution seems to be a significant threat to this species in central Argentina and future research and conservation action should be focused not only on gaining a better knowledge of the biology of the species but also on conservation and educational programmes involving local people.

L’Antartide è veramente un "awful place"? I caratteri ambientali del continente più freddo della Terra

2012 ◽  
pp. 29-46
Author(s):  
Claudio Smiraglia
Keyword(s):  
Indigenous Population ◽  
Terrestrial Ecosystems ◽  
South Pole ◽  
The Past ◽  
Unique Information ◽  
The World ◽  
Antarctic Continent ◽  
Harsh Climate ◽  
The Many ◽  
The Antarctic

The Antarctic continent is certainly made an "awful" place by its harsh climate: in the past, explorers and researchers endured terrible hardships and the climate remains a challenge today, in spite of the many improvements in knowledge and technology. The Antarctic may be termed "the continent of the extremes", as it occupies an area unlike any other on earth. It is the farthest and most inaccessible and isolated continent; the most regular because of its rounded shape, with the South Pole at the centre; the coldest continent, with temperatures falling to -90°C; the driest (with an average of 130 mm of precipitation); the windiest, the highest, the most glacialized (it contains 91% of the volume of the earth’s ice). It also displays the most monotonous landscapes and presents the greatest contrast between marine and terrestrial ecosystems. But the Antarctic is also "extreme" because it is the least populated continent, with no indigenous population at all, while its few settlements (consisting in scientific bases) are concentrated on the coast; it is the only place that does not belong to one nation, but to all the world; it is the place where unique information on the past, present and future of humankind is revealed.

Surgical Management of Bilateral Epulides in a Sloth Bear (Melursus ursinus) at Nandankanan Zoological Park

2021 ◽  
Author(s):  
I. Nath ◽  
S.K. Sahu ◽  
S.K. Panda ◽  
N. Sahoo ◽  
A.K. Das
Keyword(s):  
Retrospective Study ◽  
Oral Cavity ◽  
Wild Animals ◽  
Dental Pathology ◽  
In Captivity ◽  
Normal Feeding ◽  
Upper Jaw ◽  
Sloth Bear ◽  
Melursus Ursinus ◽  
Zoological Park

Background: Epulides, tumors of periodontal origin, are commonly reported in dogs and infrequently in cats. But its documentation among wild animals is scarce. Retrospective study of the available literature did not find any report of epulis in sloth bears, though dental pathology is common in captive sloth bears. The present study depicts the details about an incidence of bilateral epulides in a captive sloth bear of Nandankanan Zoological Park, Bhubaneswar, India and its successful surgical management.Methods: A male sloth bear aged about 15 years, developed bilateral swellings at the upper jaw, protruding out of the oral cavity, impeding with its normal feeding and drinking. Close physical examination under general anaesthesia revealed that the swellings are bilateral epulides at the upper jaw involving canines of both sides. The epulides were surgically excised, histopathology of the excised mass was conducted and a course of antibiotic treatment was followed.Result: The epulides were found to be of fibromatous and ossifying type. In the present case, there was no recurrence of epulides at the surgical site after their excision and the procedure proved curative. This work is a complementary contribution to the dental pathology study of sloth bears in captivity. 

Sign in / Sign up

Export Citation Format

Share Document