Population analysis of dental anomalies of ottersLutra lutra from eastern Germany

Hauer, Silke

doi:10.1007/bf03194152

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…For example, Janssens et al (2016) analysed wolf (Canis lupus) skulls and demonstrated hypodontia in 20% (n = 8). However, hypodontia it is not a general rule for all carnivores: (Hauer 2002).…”

Section: Discussionmentioning

confidence: 99%

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Dental and skull bone pathologies of the red fox (Vulpes vulpes) in Lithuania

Jurgelėnas

Zakienė

Daugnora

2020

Journal of Vertebrate Biology

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Section: Discussionmentioning

confidence: 99%

“…Teeth pathologies have been studied in several carnivore species, including grey fox (Gisburne & Feldhamer 2005), wolf (Vilá et al 1993), and otter (Hauer 2002). A frequent analysis of teeth…”

Section: Introductionmentioning

confidence: 99%

Dental and skull bone pathologies of the red fox (Vulpes vulpes) in Lithuania

Jurgelėnas

Zakienė

Daugnora

2020

Journal of Vertebrate Biology

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“…II). Moreover, developmental instability and fluctuating asymmetry have already been used as an explanation for dental anomalies in canids (Palmqvist et al, 1999), and in otters (Hauer, 2002). Ongoing morphometric analyses to determine the level of fluctuating asymmetry will help establish the influence of environmental stressors in this species, and consequently find support for this hypothesis.…”

Section: Discussionmentioning

confidence: 96%

Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

Chemisquy¹,

Martín

2016

Iheringia, Sér. Zool.

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ABSTRACT. Dental anomalies have been investigated and reported for most orders of mammals, including marsupials. Previous works in Didelphis albiventris Lund, 1840 only described one kind of malformation or just a few observations from some collections, thus the type and presence of anomalies for this species was underestimated. The aim of this contribution is to describe and analyze several dental anomalies found in specimens of Didelphis albiventris from Argentina, Uruguay and Brazil. Dental anomalies were classifi ed in three categories: supernumerary or missing teeth, morphological anomalies in size and shape, and teeth in unusual positions. We found 32 individuals of D. albiventris with anomalies out of 393 analyzed specimens (8.14%), some specimens with more than one anomaly. A similar proportion of specimens from Argentina and Uruguay presented anomalies, while in specimens from Brazil anomalies were less common. Anomalies were more commonly found in the upper toothrow and in molars, being supernumerary teeth and molars with unusual crown-shape the most common ones. The percentage of specimens with anomalies found for D. albiventris is higher than previously reported for the species, and other Didelphimorphia. Inbreeding and limited gene fl ow do not appear as possible explanations for the elevated percentage of anomalies, especially due to the ecological characteristics of Didelphis albiventris. Developmental instability and fl uctuating asymmetry could be some of the causes for the anomalies found in this species, mostly since the habitat used by D. albiventris tends to be unstable and disturbed. Dental anomalies were mostly found in areas of the toothrow where occlusion is relaxed or does not prevent teeth from interlocking during mastication, and consequently have no functional value.

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“…When considering mustelids, 36 of 385 (9.4 %) and 21 of 801 (2.6 %) polecat (Mustela putorius) dentitions examined by Glas (1977) and Ruprecht (1978), respectively, were missing a P 1 /P 1. Hauer (2002) reported a low incidence of oligodonty in Eurasian otters (Lutra lutra), with 9 of 1037 (0.9 %) individuals missing either the first or second premolar. Thus, compared to other carnivorans, 8.8 % (37 of 421) of our sample of wolverine missing a P 1 /P 1 or P 2 /P 2 was comparatively high.…”

Section: Discussionmentioning

confidence: 97%

Dental anomalies suggest an evolutionary trend in the dentition of wolverine (Gulo gulo)

et al. 2016

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In mammals, congenital dental anomalies likely represent an evolutionary trend in the reduction of teeth (oligodonty) from the primitive dental formula. We quantified variation in the number of teeth from 421 wolverine (Gulo gulo) from northwestern Canada, focusing on polydonty (additional teeth), congenital oligodonty, and tooth rotation (misalignment). We predicted that oligodonty may be an evolutionary consequence of a previously reported increase in size of carnassial teeth since the Pleistocene. We also predicted that wolverine with missing or rotated teeth had smaller dental arcades than those without these anomalies. Oligodonty was observed in 42 wolverines (10 %), with the most cases involving the P 1 or P 1 (56 %) and P 2 or P 2 (32 %). We observed rotated teeth in 43 % of wolverines; virtually all of the rotated teeth we observed were P 2 or P 2 . The frequency of oligodonty or rotated teeth was strikingly similar between the sexes. Both oligodonty and rotated teeth were observed more frequently in the mandibular than the maxillary toothrows. Most wolverine (67 %) with oligodonty were missing teeth unilaterally; in contrast, most animals with rotated teeth exhibited bilateralism (86 %). Condylobasal length and most measures of the dental arcade did not differ between wolverine with or without missing or rotated teeth; however, we found that skulls with missing or rotated teeth had narrower palate breadth ratios. Our data suggest that there may be an evolutionary trend in the loss of teeth at the anterior of the toothrows of wolverines, which may be a result of narrower dental arcades and larger carnassial teeth. Wolverine have a hypercarnivorous diet, and selection may be toward optimizing those teeth that contribute to securing and processing food (i.e., canine and carnassial teeth), and against those that likely do not contribute substantially to increasing fitness and survival, such as the P 1 /P 1 and P 2 /P 2 .

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Population analysis of dental anomalies of ottersLutra lutra from eastern Germany

Cited by 14 publications

References 27 publications

Dental and skull bone pathologies of the red fox (Vulpes vulpes) in Lithuania

Dental and skull bone pathologies of the red fox (Vulpes vulpes) in Lithuania

Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

Dental anomalies suggest an evolutionary trend in the dentition of wolverine (Gulo gulo)

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