Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals

Horning M, Trillmich F (1999)
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES 266(1424): 1127-1132.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
In our study of the development of diving in Galapagos fur seals, we analysed changes in diving activity and body mass trends over the lunar cycle. Based on previously observed lunar cycles in colony attendance patterns, we hypothesized a greater impact of prey migrations of deep scattering layer organisms on younger fur seals. Using electronic dive recorders, we determined that seals dived less and deeper on moonlit nights than at new moon, and incurred body mass losses. These changes in foraging over the lunar cycle correlate with the suppression of the vertical migration of prey by lunar light. All effects were more pronounced in juveniles than adult females, with greater relative mass loss during full moon, which must (i) negatively affect long-term juvenile growth rates, (ii) lengthen periods of maternal dependence, and (iii) contribute to the lowest reproductive rate reported for seals. This underlines the importance of studying ontogeny in order to understand life histories, and for determining the susceptibility of animal populations to fluctuations in food availability.
Stichworte
life history; ontogenetic constraints; juvenile; diving; development; foraging efficiency
Erscheinungsjahr
1999
Zeitschriftentitel
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
Band
266
Ausgabe
1424
Seite(n)
1127-1132
ISSN
0962-8452
eISSN
1471-2954
Page URI
https://pub.uni-bielefeld.de/record/1622694

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Horning M, Trillmich F. Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES. 1999;266(1424):1127-1132.
Horning, M., & Trillmich, F. (1999). Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES, 266(1424), 1127-1132. doi:10.1098/rspb.1999.0753
Horning, M., and Trillmich, F. (1999). Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES 266, 1127-1132.
Horning, M., & Trillmich, F., 1999. Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES, 266(1424), p 1127-1132.
M. Horning and F. Trillmich, “Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals”, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES, vol. 266, 1999, pp. 1127-1132.
Horning, M., Trillmich, F.: Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES. 266, 1127-1132 (1999).
Horning, M, and Trillmich, Fritz. “Lunar cycles in diel prey migrations exert a stronger effect on the diving of juveniles than adult Galapagos fur seals”. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES 266.1424 (1999): 1127-1132.

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