Infant position in mother-calf dolphin pairs: formation locomotion with hydrodynamic benefits

Noren, Shawn R.; Edwards, Elizabeth F.

doi:10.3354/meps08986

Cited by 36 publications

(31 citation statements)

References 44 publications

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“…In this study, we test the hypothesis of parental care and evaluate the prediction that a demonstrable degree of parental care would be observed in this species. This expectation is consistent with previous studies of the common bottlenose dolphin, Tursiops truncatus (Montagu, 1821), which reported that offspring show an underdeveloped physiology (NOREN 2007). The second objective of the study is to investigate how the behavioral state and group size influence the intensity of parental care in groups containing both adults and offspring.…”

supporting

confidence: 75%

“…The speed of adults traveling ahead of their offspring was found to be 76% less than the speed of adults traveling without offspring (NOREN 2007). Moreover, the distance to which dolphins could reach when hitting their flukes in the water was decreased by 13% (NOREN 2007).…”

Section: Parental Carementioning

confidence: 86%

“…An additional prediction is that parental care will be less intense during feeding behavior because the physical proximity of the offspring can constrain the mothers' ability to herd and capture prey. This hypothesis is derived from data on T. truncatus indicating that mothers reduced their speed of movement up to 76% compared to mothers without offspring (NOREN 2007). The third objective of this study is to evaluate differences in the intensity of parental care furnished to calves and juveniles.…”

mentioning

confidence: 99%

“…These species include the North Atlantic right whale, Eubalaena glacialis (P.S.L Müller, 1776) (HAMILTON & COOPER 2010); the humpback whale, Megaptera novaeangliae (Borowski, 1781) (SZABO & DUFFUS 2008); the IndoPacific bottlenose dolphin, Tursiops aduncus (Ehrenberg, 1833) (MANN & SMUTS 1999); and the killer whale, Orcinus orca (Linnaeus, 1758). Such studies have focused on infant carrying behavior and the associated infant echelon position (MANN & SMUTS 1999), which is reported to provide hydrodynamic (NOREN 2007) and offspring feeding benefits (MANN & SMUTS 1999). Infant carrying behavior is observed in six of 19 orders of eutherian mammals (ROSS 2001) and is the second most costly behavior in mammals (ALTMANN & SAMUELS 1992).…”

mentioning

confidence: 99%

“…They have extended gestational periods (WHITEHEAD & MANN 2000), and the offspring are known to have an underdeveloped physiology (NOREN 2007) associated with high levels of mortality (WHITEHEAD & MANN 2000). Therefore, offspring often tend to stay with the mother for prolonged periods of time, even if they are nutritionally independent (MANN & SMUTS 1999).…”

mentioning

confidence: 99%

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Parental care behavior in the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Ilha Grande Bay, southeastern Brazil

Tardin¹,

Espécie²,

Lodi³

et al. 2013

Zoologia (Curitiba)

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ABSTRACT. Parental care is any form of parental behavior that increases offspring fitness. To the authors' knowledge, this study is the first to analyze the intensity of parental care in the Guiana dolphin, Sotalia guianensis (van Bénéden, 1864). The objectives of this study are as follows: 1) to quantify the degree of parental care in S. guianensis in Ilha Grande Bay, Rio de Janeiro; 2) to investigate the influence of behavioral state and group size on the degree of parental care; and 3) to evaluate the differences between the intensity of parental care provided to calves and juveniles. Our results indicate that the intensity of parental care is high in S. guianensis and that care is more intense in larger groups.It is possible that these differences serve to maximize hydrodynamic gains and to minimize risks. Our results suggest that parental care is more intense during travel. A possible reason for this greater intensity is that the feeding dynamics show a more random pattern than other behavioral states. Moreover, the results indicate that calves receive more intense care than juveniles. These results suggest that parent-offspring conflict is possible in the study population.KEY WORDS. Adult-offspring relationship; parent-offspring conflict.

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supporting

confidence: 75%

Section: Parental Carementioning

confidence: 86%

mentioning

confidence: 99%