@article {58419,
	title = {Individual-based acoustic variation of the alarm calls in the long-tailed ground squirrel},
	year = {2021},
	abstract = {<p>Based on their phylogenetic position, Nearctic ground squirrels are closest relatives to the long-tailed ground squirrel Urocitellus undulates even though it has Palaearctic distribution. We aimed to investigate the variability of alarm calls of the long-tailed ground squirrel to test the individual variation in alarm calls. This species is known to produce two types of alarm calls: whistle alarms and wideband calls. Although ground squirrels are a model group for the study of vocal individuality, this phenomenon has not yet been studied in a species producing two such completely different types of alarms. Most of ground squirrel species produce either whistle or wideband alarms and this species represents a unique model for testing the degree of individual variability depending on completely different acoustic structures. We analysed 269 whistle alarms produced by 13 individuals and 591 wideband alarms from 25 individuals at the western part of Lake Baikal. A discriminant function analysis (DFA) assigned 93.5\% (88.9\%, cross-validated result) of whistle alarms to the correct individual and 91.4\% (84\%) of wideband alarms. This is the first evidence of individual variation in wideband alarms compared with whistle alarms and occurrence of vocal individuality in two warning signals of a completely different acoustic structure produced by a ground squirrel.</p>
},
	keywords = {acoustic evolution, alarm call, rodent, Spermophilus, Urocitellus, vocal diversity},
	doi = {10.1098/rsos.200147},
	url = {https://royalsocietypublishing.org/doi/10.1098/rsos.200147},
	author = {Goncharov, Denis and Policht, Richard and Hamb{\'a}lkov{\'a}, Lucie and Salovarov, Viktor and Hart, Vlastimil}
}
@article {57415,
	title = {Perinatal high-fat diet impairs pup retrieval and induces sex-specific changes in ultrasonic vocalization characteristics of rat pups},
	year = {2019},
	abstract = {<p>Rodent pups emit ultrasonic vocalizations (USVs) to solicit maternal behavior, promoting their survival. Conversely, maternal behaviors affect the expression of pup USVs. We previously demonstrated that a maternal diet high in saturated fat (HFD) alters maternal behavior and is associated with early maturation of pups and their stress physiology. Here, we assessed the developmental profiles of pup USVs using quantitative and qualitative measures on postnatal days (PND)7 and 13. Quantitative measures included call counts, duration, and frequency, while qualitative measures examined calls\&$\#$39; sonographic structures. HFD offspring lacked the typical decrease in USV numbers with age observed among control offspring. They also had shorter calls at PND7 compared to control and HFD offspring at PND13. HFD female offspring showed a greater number of one-frequency-sweep calls, while male pups showed a greater number of two-frequency-sweep calls compared to control offspring. Concomitantly, HFD dams showed impaired pup retrieval on PND7. The data suggest that fewer USVs of shorter duration in HFD offspring may alter dam solicitation and thus impair maternal pup retrieval. This study highlights the impacts of perinatal HFD exposure on the dyadic reciprocal interaction between dam and pups, which may set the stage for long-lasting effects on offspring physiology and behavior.</p>
},
	keywords = {development, maternal behavior, mother{\textendash}pup interactions, perinatal high-fat diet, rodent, sonogram, ultrasonic vocalization},
	doi = {10.1002/dev.21923},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/dev.21923},
	author = {Abuaish, Sameera and Tse, Emmanuel K. and McGowan, Patrick O.}
}
