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1

Postnatal development of morphological features and vocalization in the pomona leaf-nosed bat Hipposideros pomona

100%
Jin L.-r., Lin A.-q., Sun K.-p., Liu Y., Feng J.
Acta Theriologica
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2011
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tom 56
|
nr 1
Based on mark-recapture data, we studied the postnatal development of morphological features and vocalization of the pomona leaf-nosed bat (Hipposideros pomona). Morphological changes indicated that body mass and length of forearm followed a linear pattern of growth until 13 days of age at mean growth rates of 0.14 g/day and 1.08 mm/day, respectively, and thereafter, growth rates slowed. The length of the total epiphyseal gap of the fourth metacarpal–phalangeal joint showed a linear increase for up to 10 days, followed by a linear decrease until day 40 at a mean rate of 0.09 mm/day. Together, two equations permitted estimation of the age of H. pomona pups between 1 and 40 days. The logistic equation provided the best fit to the empirical curves for body mass and length of forearm. Studies of vocal development showed that the precursors of echolocation calls were not emitted until day 7 after birth. As the pups grew, the dominant frequency (DF) of isolation calls increased and number of harmonics (NH) decreased, whereas the duration remained relatively stable. The DF and BFM2 (the bandwidth of the terminal frequency-modulated sweep from the second harmonic) of the early echolocation calls increased; however, the NH and duration decreased.
2

Notes on calls of the Yellow-breasted Boubou [Laniarius atroflavus] during the breeding season in NW Cameroon

100%
Riegert J., Pribylova A., Sedlacek O.
Biological Letters
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2004
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tom 41
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nr 2
181-184
3

Relation between fearfulness level and maternal behaviour in Arab mares

100%
Budzynska M., Krupa W.
Animal Science Papers and Reports
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2011
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tom 29
|
nr 2
The study aimed at testing the hypothesis that mares’ fearfulness is a potential factor differentiating the level of their maternal behaviour. Twenty purebred Arab mares were used. In part one of the study fearfulness of mares without foals was assessed by their behavioural reactivity and heart rate in response to rotating black-white squares (fearfulness test). On that basis the mares were classified into three groups: (1) fearless, n=8, (2) medium-fearful, n=7 and (3) fearful, n=5. In part two,maternal behaviour of mares was assessed in two sessions of separation test: 3 min dam’s partial separation from foal (mare out of box, but with visual, auditory and olfactory contact with foal) and 3 min full separation (mare out of stable, no contact with foal). Locomotor activity, vocalization and defecation frequency as well as heart rate in mares were recorded during both separation tests. The results showed a relation between mares’ fearfulness and their maternal behaviour. Fearless dams vocalized more (10.63±5.32, mean rank 13.00, P<0.05) and showed higher heart rate (138.00±22.66 beats/min, mean rank 15.40, P<0.05) when totally separated from their foals, compared to fearful dams (4.00±3.74 calls, mean rank 6.10; 116.00±20.32 beats/min, mean rank 7.23, P<0.05). Thus, fearless dams generally displayed higher maternal ability which is vitally important in successful breeding. In conclusion, selecting for low fearfulness ensures appropriate maternal behaviour of the brood mares.
4

Geographic variation in vocal signals of Ctenomys pearsoni

100%
Francescoli G.
Acta Theriologica
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2002
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tom 47
|
nr 1
The S-type vocalizations of three populations of Ctenomys from Uruguay were compared: two of Ctenomys pearsoni Lessa and Langguth, 1983 from Penino and Relincho and the third from a different karyomorph of the genus (Solis karyomorph). Ten rhythm and 3 frequency variables were used for discriminant analysis. The results showed that a set of nine variables allowed a complete separation of the populations. The two C. pearsoni populations were correctly discriminated from one another using four variables, the differences lying especially in the rhythm domain. Information about the general biology and distribution of the animals suggest that these differences could be explained as a product of chance variations and later fixation of the variants in local populations. The Solis karyomorph was also correctly discriminated from the other populations using four variables, but main frequency seems to play an important role in this case.
5

Recognition of individuals of Ortolan bunting Emberiza hortulana using image processing procedures

100%
Kuczynski L.
Biological Bulletin of Poznań
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2000
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tom 37
|
nr 1
6

Note types and coding in parid vocalizations: the chick-a-dee call of the Mexican Chickadee Poecile sclateri

84%
Moscicki M. K., Hoeschele M., Sturdy C. B.
Acta Ornithologica
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2010
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tom 45
|
nr 2
7

Juvenile vocalizations of Ctenomys talarum [Rodentia: Octodontidae]

84%
Schleich C. E., Busch C.
Acta Theriologica
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2002
|
tom 47
|
nr 1
We analysed the physical structure and functional interpretation of juvenile vocaliza­tions of Ctenomys talarum Thomas, 1898. Two sounds, one true vocalization (care- -elicitation call) and one mechanical sound (nursing sound) were recorded during the nestling period. Care-elicitation calls were emitted by isolated pups and caused the mother to respond by immediately approaching the pups to take care of them. This maternal response to the care-elicitation calls of C. talarum pups, together with the production of these vocalizations during the first weeks after birth, when pups depend exclusively on their mother to obtain food and maintain their body temperature, give preliminary support for the recent theory that care-elicitation cries are honest adver­tisements of offspring need.
8

Vocal communication in the bicoloured white-toothed shrew Crocidura leucodon

84%
Simeonovska-Nikolova D. M.
Acta Theriologica
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2004
|
tom 49
|
nr 2
Vocal sounds of 15 individuals of Crocidura leucodon (Hermann, 1780) emitted during agonistic and amicable interactions in male-male, female-female and male- -femalejdyadic encounters, and intráspecific cage groups, were studied. An analysis of spectral properties, along with an examination of context and function, were performed. The sounds registered during agonistic interactions showed an increase, then a decrease in frequency, often followed a complex undulating curve. The dominant frequency (DF) was 10.7 ± 0.05 kHz, and duration (DU) was 104.2 ± 4.4 ms. The calls emitted by shrews at investigation and grooming often ended with chirping notes (DF = 4.8 ± 0.2 kHz, DU = 23.5 ± 1.1 ms). While clustering and huddling up to the partner, the animals produced calls consisting of short notes with a very low intensity (DF = 1.0 ± 0.07 kHz, DU = 35.2 ± 0.8 ms). Based on these finding, it can be assumed that threatening sounds, emitted in agonistic encounters, allow shrews to avoid conflicts, while those, emitted when clustering and huddling up to the partner, contribute to maintenance of group cohesiveness. The variability of frequency ranges and intensity of sounds probably reflects the territorial and gregarious behaviour of C. leucodon and adaptation to communication in variable acoustic environments.
9

Individual and sexual differences in the calls of the monomorphic White-faced Whistling Duck Dendrocygna viduata

67%
Volodin I. A., Volodina E. V., Klenova A. V., Filatova O. A.
Acta Ornithologica
|
2005
|
tom 40
|
nr 1
43-52
The White-faced Whistling Duck is a waterfowl species lacking any differences in ornamentation, coloration, size or behavior between the sexes. For distant communication, this species uses loud whistles. We analyzed 12 spectral parameters of 344 whistles from 23 captive adult ducks (14 males and 9 females). Discriminant analysis showed 94% correct assignment to an individual (N = 279 calls from 14 birds; 15-22 calls per bird). Separately for 8 males (162 calls) and for 6 females (117 calls), discriminant analysis showed 99% and 93% correct assignment to individuals respectively. Discriminant analysis for sex (N = 86; 3 calls from each of 14 males and 5 calls from each of 9 females) showed 100% correct assignment. Intersexual differences were governed by frequency parameters, the values of which were significantly higher in females than in males. Cluster analysis showed that differences between sexes were expressed significantly more strongly than the individual differences. The fact that the "acoustical keys" differed as regards the identification of individual birds or their sex may significantly enhance the reliability of acoustical recognition systems in the White-faced Whistling Duck. The data are discussed in the context of the biology of the Whitefaced Whistling Duck and significant intersexual differences in syringial and tracheal anatomy, which may be responsible for the sharp distinctions between the sexes in the calls of this species.
10

Koszmar serenady o północy

67%
Ciribassi J.
Weterynaria po Dyplomie
|
2017
|
tom 18
|
nr 1
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