The Identity of the Dingo II.* Hybridization with Domestic Dogs in Captivity and in the Wild

1982 ◽  
Vol 30 (2) ◽  
pp. 365 ◽  
Author(s):  
AE Newsome ◽  
LK Corbett
Keyword(s):  
Rate Of Change ◽  
Domestic Dog ◽  
Confidence Limits ◽  
Skull Morphology ◽  
Wild Canids ◽  
Eastern Australia ◽  
In Captivity ◽  
Skull Measurements ◽  
In The Wild ◽  
Canonical Analyses

The possibility that wild canids in south-eastern Australia were hybrids of Canis familiaris dingo and C.f. familiaris was examined by breeding known hybrids in captivity and comparing eight skull measurements in canonical analyses. The resulting distribution of the known hybrids was mainly intermediate to but overlapping those of the calibrating samples of dingoes and dogs whose distributions were separate. The distribution of the unknown wild canids closely resemblzd that of the known hybrids. An extra sample of wild dingoes resembled the calibrating dingoes. Comparisons with 95% population confidence limits of calibrating samples classified 12% of unknowns as dogs. 52% as hybrids and 36% as dingoes. The similarities of known hybrids and wild unknowns resulted from different assemblages of skull characters, but the two prime characters in the discrimination, bulla volume and alveolar distance of PI to P,, were commonly reduced in size in both groups. Maxillary width was dog-like in the unknowns but dingo-like in known hybrids. In the latter. increase in domestic dog ancestry caused an increase in the rate of change of skull morphology; but even so small an ancestry as 0.125-0.25 domestic dog caused marked changes compared with the eight parental dingoes. There was also evidence of skull changes due to the domestication process. The most indicative was foreshortening of the alveolar distance from P*1 to P*4 found in 34 of the 41 known hybrids and in four of the eight parental dingoes. There was no evidence for inheritance of the trait.

The Identity of the Dingo III.* The Incidence of Dingoes, Dogs and Hybrids and their Coat Colours in Remote and Settled Regions of Australia

1985 ◽  
Vol 33 (3) ◽  
pp. 363 ◽  
Author(s):  
AE Newsome ◽  
LK Corbett
Keyword(s):  
Canis Familiaris ◽  
Skull Morphology ◽  
Cross Breeding ◽  
Black And White ◽  
South Eastern ◽  
Wild Canids ◽  
Eastern Australia ◽  
In Captivity ◽  
Canonical Analyses ◽  
South Eastern Australia

Dingoes Canis familiaris dingo, dogs C.J: familiaris, and their hybrids were classified on skull morphology as the following percentages in remote, inland Australia: 97.5,O.1 and 2.4; and in settled south-eastern Australia as 55.3, 10.8 and 33.92%. Canonical analyses of 1184 skulls from the former area and 407 from the latter indicate that mixed populations can be expected wherever close human settlement exists and wild canids remain, but that hybrids are rare in remote regions. The skulls were collected variously between 1966 and 1979; 15 equations were used to allow for differential damage to skulls. The levels of hybridization indicated by the skulls were confirmed by coat colours. The accepted colours for dingoes, (ginger, black-and-tan, and all white) were in the following percentages in inland Australia: 88.6, 3.8 and 1.9; in south-eastern Australia they were 45.9, 19.1 and 0.2%. Broken colorations, ginger with white, black or bluish patches, all black, brown or bluish, black and white, and brindle stripes, were also more numerous in the latter region (34 8%) than in the former (5.7%). Many of these variations arose in cross-breeding experiments with ginger dingoes and variously coloured domestic dogs. Historical reports recorded black dingoes but did not mention tan coloration. That may have been an oversight; if not, it may be a further indication of cross-breeding. The incidence of coat colours was not significantly different in classified dingoes, dogs and hybrids in south-eastern Australia, but ginger coats were less common in classified dogs. Those taxa and the various colorations were not more numerous near farmland than elsewhere in the forests there. A new, basic calibrating equation incorporating the length rather than the volume of auditory bulla is presented. The equation corrects also for mis-measurement of one skull variable in some of the calibrating series of dingoes. Corrigenda are presented. They do not change the general conclusions of the earlier Parts I and II of this series, but wild dingoes raised from pups in captivity did not develop foreshortened snouts as indicated earlier. The possibility remains that some may have developed wider maxillae than wild dingoes.

Photopigments of dogs and foxes and their implications for canid vision

1993 ◽  
Vol 10 (1) ◽  
pp. 173-180 ◽  
Author(s):  
Gerald H. Jacobs ◽  
Jess F. Deegan ◽  
Michael A. Crognale ◽  
John A. Fenwick
Keyword(s):  
Color Vision ◽  
Red Fox ◽  
Domestic Dog ◽  
Alopex Lagopus ◽  
Gray Fox ◽  
Wild Canids ◽  
Cone Pigment ◽  
Urocyon Littoralis ◽  
In The Wild ◽  
Peak Sensitivity

AbstractElectroretinogram (ERG) flicker photometry was used to examine the photopigment complements of representatives of four genera of Canid: domestic dog (Canis familiaris), Island gray fox (Urocyon littoralis), red fox (Vulpes vulpes), and Arctic fox (Alopex lagopus). These four genera share a common cone pigment complement; each has one cone pigment with peak sensitivity of about 555 nm and a second cone pigment with peak at 430–435 nm. These pigment measurements accord well with the conclusions of an earlier investigation of color vision in the dog, and this fact allows some predictions about color vision in the wild canids. An additional set of measurements place the peak of the dog rod pigment at about 508 nm.

scholarly journals On the modulation and maintenance of hibernation in captive dwarf lemurs

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marina B. Blanco ◽  
Lydia K. Greene ◽  
Robert Schopler ◽  
Cathy V. Williams ◽  
Danielle Lynch ◽  
...  
Keyword(s):  
Food Restriction ◽  
Metabolic Disorders ◽  
Biological Rhythms ◽  
Food Ingestion ◽  
Ambient Temperatures ◽  
In Captivity ◽  
In The Wild ◽  
Cheirogaleus Medius ◽  
Save Energy ◽  
Metabolic Strategies

AbstractIn nature, photoperiod signals environmental seasonality and is a strong selective “zeitgeber” that synchronizes biological rhythms. For animals facing seasonal environmental challenges and energetic bottlenecks, daily torpor and hibernation are two metabolic strategies that can save energy. In the wild, the dwarf lemurs of Madagascar are obligate hibernators, hibernating between 3 and 7 months a year. In captivity, however, dwarf lemurs generally express torpor for periods far shorter than the hibernation season in Madagascar. We investigated whether fat-tailed dwarf lemurs (Cheirogaleus medius) housed at the Duke Lemur Center (DLC) could hibernate, by subjecting 8 individuals to husbandry conditions more in accord with those in Madagascar, including alternating photoperiods, low ambient temperatures, and food restriction. All dwarf lemurs displayed daily and multiday torpor bouts, including bouts lasting ~ 11 days. Ambient temperature was the greatest predictor of torpor bout duration, and food ingestion and night length also played a role. Unlike their wild counterparts, who rarely leave their hibernacula and do not feed during hibernation, DLC dwarf lemurs sporadically moved and ate. While demonstrating that captive dwarf lemurs are physiologically capable of hibernation, we argue that facilitating their hibernation serves both husbandry and research goals: first, it enables lemurs to express the biphasic phenotypes (fattening and fat depletion) that are characteristic of their wild conspecifics; second, by “renaturalizing” dwarf lemurs in captivity, they will emerge a better model for understanding both metabolic extremes in primates generally and metabolic disorders in humans specifically.

scholarly journals Previously unknown behavior in parasitic cuckoo females: male-like vocalization during migratory activity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Swetlana G. Meshcheryagina ◽  
Alexey Opaev
Keyword(s):  
Vocal Communication ◽  
Harmonic Spectrum ◽  
Common Cuckoo ◽  
Neck Extension ◽  
Migratory Activity ◽  
Call Production ◽  
In Captivity ◽  
In The Wild ◽  
Combined Features ◽  
Female Call

Abstract Background In the last decade, enigmatic male-like cuckoo calls have been reported several times in East Asia. These calls exhibited a combination of vocal traits of both Oriental Cuckoo (Cuculus optatus) and Common Cuckoo (Cuculus canorus) advertising calls, and some authors therefore suggested that the enigmatic calls were produced by either Common × Oriental Cuckoo male hybrids or Common Cuckoo males having a gene mutation. However, the exact identity of calling birds are still unknown. Methods We recorded previously unknown male-like calls from three captive Oriental Cuckoo females, and compared these calls with enigmatic vocalizations recorded in the wild as well as with advertising vocalizations of Common and Oriental Cuckoo males. To achieve this, we measured calls automatically. Besides, we video-recorded captive female emitting male-like calls, and compared these recordings with the YouTube recordings of calling males of both Common and Oriental Cuckoos to get insight into the mechanism of call production. Results The analysis showed that female male-like calls recorded in captivity were similar to enigmatic calls recorded in the wild. Therefore, Oriental Cuckoo females might produce the latter calls. Two features of these female calls appeared to be unusual among birds. First, females produced male-like calls at the time of spring and autumn migratory activity and on migration in the wild. Because of this, functional significance of this call remained puzzling. Secondly, the male-like female call unexpectedly combined features of both closed-mouth (closed beak and simultaneous inflation of the ‘throat sac’) and open-mouth (prominent harmonic spectrum and the maximum neck extension observed at the beginning of a sound) vocal behaviors. Conclusions The Cuculus vocalizations outside the reproductive season remain poorly understood. Here, we found for the first time that Oriental Cuckoo females can produce male-like calls in that time. Because of its rarity, this call might be an atavism. Indeed, female male-like vocalizations are still known in non-parasitic tropical and apparently more basal cuckoos only. Therefore, our findings may shed light on the evolution of vocal communication in avian brood parasites.

scholarly journals Reintroduction of the Golden Conure (Guaruba guarouba) in Northern Brazil: Establishing a Population in a Protected Area

Diversity ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 198
Author(s):  
Marcelo Rodrigues Vilarta ◽  
William Wittkoff ◽  
Crisomar Lobato ◽  
Rubens de Aquino Oliveira ◽  
Nívia Gláucia Pinto Pereira ◽  
...  
Keyword(s):  
Power Lines ◽  
Food Supplementation ◽  
Territorial Disputes ◽  
Amazon Forest ◽  
Nest Boxes ◽  
In Captivity ◽  
Viable Population ◽  
In The Wild ◽  
Northern Brazil ◽  
Native Foods

Brazil has the highest number of parrots in the world and the greatest number of threatened species. The Golden Conure is endemic to the Brazilian Amazon forest and it is currently considered as threatened by extinction, although it is fairly common in captivity. Here we report the first reintroduction of this species. The birds were released in an urban park in Belem, capital of Para State, where the species was extinct more than a century ago. Birds were trained to recognize and consume local food and to avoid predators. After the soft-release, with food supplementation and using nest boxes, we recorded breeding activity in the wild. The main challenges before the release were the territorial disputes within the aviary and the predation by boa snakes. During the post-release monitoring the difficulties were the fast dispersion of some individuals and the dangers posed by anthropic elements such as power lines that caused some fatalities. Released birds were very successful at finding and consuming native foods, evading predators, and one pair reproduced successfully. Monitoring continues and further releases are programmed to establish an ecologically viable population.

scholarly journals Numerical assessment in the wild: insights from social carnivores

2018 ◽  
Vol 373 (1740) ◽  
pp. 20160508 ◽  
Author(s):  
Sarah Benson-Amram ◽  
Geoff Gilfillan ◽  
Karen McComb
Keyword(s):  
Cognitive Abilities ◽  
Future Research ◽  
Wild Animals ◽  
Playback Experiments ◽  
Natural Habitats ◽  
Numerical Assessment ◽  
Individual Discrimination ◽  
In Captivity ◽  
Assessment Skills ◽  
In The Wild

Playback experiments have proved to be a useful tool to investigate the extent to which wild animals understand numerical concepts and the factors that play into their decisions to respond to different numbers of vocalizing conspecifics. In particular, playback experiments have broadened our understanding of the cognitive abilities of historically understudied species that are challenging to test in the traditional laboratory, such as members of the Order Carnivora. Additionally, playback experiments allow us to assess the importance of numerical information versus other ecologically important variables when animals are making adaptive decisions in their natural habitats. Here, we begin by reviewing what we know about quantity discrimination in carnivores from studies conducted in captivity. We then review a series of playback experiments conducted with wild social carnivores, including African lions, spotted hyenas and wolves, which demonstrate that these animals can assess the number of conspecifics calling and respond based on numerical advantage. We discuss how the wild studies complement those conducted in captivity and allow us to gain insights into why wild animals may not always respond based solely on differences in quantity. We then consider the key roles that individual discrimination and cross-modal recognition play in the ability of animals to assess the number of conspecifics vocalizing nearby. Finally, we explore new directions for future research in this area, highlighting in particular the need for further work on the cognitive basis of numerical assessment skills and experimental paradigms that can be effective in both captive and wild settings. This article is part of a discussion meeting issue ‘The origins of numerical abilities’.

First record of quadruplets in the musky ratkangaroo Hypsiprymnodon moschatus.

2005 ◽  
Vol 27 (1) ◽  
pp. 95 ◽  
Author(s):  
PM Johnson ◽  
S Lloyd ◽  
T Vallance ◽  
MDB Eldridge
Keyword(s):  
Digestive Tract ◽  
First Record ◽  
Tropical Rainforests ◽  
North East ◽  
In Captivity ◽  
In The Wild

THE musky rat-kangaroo (Hypsiprymnodon moschatus) is endemic to the tropical rainforests of north-east Queensland (Johnson and Strahan 1982). It is the smallest (510 ? 530 g) and most unusual member of the marsupial superfamily Macropodoidea (Dennis and Johnson 1995). Unlike other macropodoids, H. moschatus is frugivorous, diurnal, has an opposable first digit on the pes, a running quadrupedal gait and possesses a relatively unspecialised digestive tract (Johnson and Strahan 1982; Dennis 2002). It also differs from all other macropodoids in typically giving birth to multiple young, usually twins ? although single young and triplets are regularly reported both in the wild and in captivity (Troughton 1967; Johnson and Strahan 1982; Johnson et al. 1983; Dennis and Marsh 1997; Lloyd 2001). However, the birth of more than three young has not previously been observed in H. moschatus or any other macropodoid, even though all species possess four teats.

scholarly journals Challenges and opportunities for monitoring wild Nile crocodiles with scute mark-recapture photography

Koedoe ◽  
2018 ◽  
Vol 60 (1) ◽  
Author(s):  
Bernard W.T. Coetzee ◽  
Sam M. Ferreira ◽  
Kristine Maciejewski
Keyword(s):  
Conservation Status ◽  
Field Conditions ◽  
High Turnover ◽  
Mark Recapture ◽  
Non Invasive ◽  
Open Population ◽  
Challenges And Opportunities ◽  
In Captivity ◽  
In The Wild

The global conservation status of Nile crocodiles (Crocodylus niloticus) was last assessed in 1996. The species presents particular difficulty in monitoring because it can be cryptic, require expertise to handle, and caudal tail tags and transmitters are often lost. Some studies advocate mark-recapture techniques based on photograph identification of the unique scute markings of crocodile tails as a non-invasive means of monitoring their populations. Researchers developed this method with crocodiles in captivity. In this study, we test the technique under field conditions by monitoring crocodiles from 2015 to 2017 in the Sunset Dam in the Kruger National Park. Using a Cormack-Jolly-Seber open population model, we found that the dam may host 15–30 individuals, but that there is a high turnover of individuals and much uncertainty in model outputs. The dam’s population thus has high rates of immigration and emigration. The method proved challenging under field conditions, as there was bias in identifying scute markings consistently. The efficient use of the method requires an exceptional quality of photographic equipment. Animal crypsis, however, remains an issue. In this study, we discuss how to improve the mark-recapture photography methodology, especially to adapt the technique for citizen science initiatives.Conservation implications: Using scute mark-recapture photography presents challenges under field conditions. These challenges require innovative, practical and analytical solutions to successfully use the technique before monitoring programmes, aimed at ensuring the persistence of crocodiles in the wild, can be implemented.

scholarly journals A whole genome analysis of the red-crowned crane provides insight into avian longevity

2017 ◽  
Author(s):  
HyeJin Lee ◽  
Oksung Chung ◽  
Yun Sung Cho ◽  
Sungwoong Jho ◽  
JeHoon Jun ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Whole Genome ◽  
Whole Genome Analysis ◽  
Grus Japonensis ◽  
Low Genetic Diversity ◽  
In Captivity ◽  
In The Wild ◽  
Genetic Mechanisms ◽  
Avian Genomes ◽  
Insight Into

AbstractThe red-crowned crane (Grus japonensis) is an endangered and large-bodied crane native to East Asia. It is a traditional symbol of longevity and its long lifespan has been confirmed both in captivity and in the wild. Lifespan in birds is positively correlated with body size and negatively correlated with metabolic rate; although the genetic mechanisms for the red-crowned crane’s long lifespan have not previously been investigated. Using whole genome sequencing and comparative evolutionary analyses against the grey-crowned crane and other avian genomes, we identified candidate genes that are correlated with longevity. Included among these are positively selected genes with known associations with longevity in metabolism and immunity pathways (NDUFA5, NDUFA8, NUDT12 IL9R, SOD3, NUDT12, PNLIP, CTH, and RPA1). Our analyses provide genetic evidence for low metabolic rate and longevity, accompanied by possible convergent adaptation signatures among distantly related large and long-lived birds. Finally, we identified low genetic diversity in the red-crowned crane, consistent with its listing as an endangered species, and we hope this genome will provide a useful genetic resource for future conservation studies of this rare and iconic species.

Sign in / Sign up

Export Citation Format

Share Document