Influences of moonlight, ambient temperature, and food availability on the diurnal and nocturnal activity of owl monkeys (Aotus azarai)

@article{FernndezDuque2003InfluencesOM,
  title={Influences of moonlight, ambient temperature, and food availability on the diurnal and nocturnal activity of owl monkeys (Aotus azarai)},
  author={Eduardo Fern{\'a}ndez‐Duque},
  journal={Behavioral Ecology and Sociobiology},
  year={2003},
  volume={54},
  pages={431-440}
}
The study of activity rhythms, their potential zeitgebers and masking factors among free-ranging primates has received relatively little attention in the past. [] Key Method During 1 year, I collected activity data from five groups followed continuously from dawn to dusk, dusk to dawn or uninterruptedly during 24 or 36 h for approximately 1,500 h. I kept hourly and daily records of temperature and light conditions, and I gathered monthly information on the density, distribution and abundance of food…

Moonstruck Primates: Owl Monkeys (Aotus) Need Moonlight for Nocturnal Activity in Their Natural Environment

TLDR
The results highlight the importance of the masking of circadian rhythmicity as a determinant of nocturnality in wild owl monkeys and suggest that the stimulatory effects of dim light in nocturnal primates may have been selected as an adaptive response to moonlight.

Seasonal Variation of Temporal Niche in Wild Owl Monkeys (Aotus azarai azarai) of the Argentinean Chaco: A Matter of Masking?

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The authors suggest the seasonal variations of the timing and pattern of daily activity in wild owl monkeys of the Argentinean Chaco result from a specific interplay of light entrainment of circadian rhythmicity and strong masking effects of various endogenous and environmental factors.

Hiding from the Moonlight: Luminosity and Temperature Affect Activity of Asian Nocturnal Primates in a Highly Seasonal Forest

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Although mean activity was significantly affected by moonlight, the interaction between moonlight and temperature was also significant: on bright nights, studied animals were increasingly more active with higher temperature; and on dark nights they were consistently active regardless of temperature.

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This study observed the diurnal activity of one group of A. nigriceps living in the Manu Biosphere Reserve, Peru over 65 days and indicates that for A.nigriceps the potential costs of shifting to diurnality may outweigh its prospective advantages in this rainforest environment.

Effects of Temperature, Moon Phase, and Prey on Nocturnal Activity in Ratsnakes: An Automated Telemetry Study

Abstract Nocturnal activity is important for many animals, but difficulty in documenting that activity has hampered efforts to understand factors that influence when animals are active at night. We

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Although most South American owl monkeys are mainly nocturnal, Aotus azarai azarai of the Argentinean Chaco regularly shows diurnal activity. In this study we examined the strong influence of

Nocturnal ranging by a diurnal primate: are ring-tailed lemurs (Lemur catta) cathemeral?

  • J. Parga
  • Environmental Science
    Primates
  • 2011
TLDR
Investigating the possibility of nocturnal ranging behavior in the ring-tailed lemur (Lemur catta) by using global positioning system (GPS) collars programmed to collect data across a 24-h period raised the possibility that L. catta may be cathemeral, with an activity pattern fluctuating between diurnality and cathemerality in accordance with shifts in environmental conditions.

Lunar periodic modulation of the circadian activity rhythm in a wild North Colombian night monkey (Aotus griseimembra)

TLDR
Long-term activity recordings of a wild female A. griseimembra in a tropical rainforest near San Juan de Carare, Northern Colombia confirmed strictly nocturnal behavior, a pronounced bimodal activity pattern with prominent peaks during dusk and dawn, and a lunar periodic modulation of the night monkey’s circadian activity rhythm due to distinct activity inhibiting effects of the absence of moonlight throughout the night.

Activity Patterns, Diet and Home Range of Night Monkeys (Aotus griseimembra and Aotus lemurinus) in Tropical Lowland and Mountain Forests of Central Colombia

TLDR
This research suggests these two nocturnal primates, living in contrasting environments, use similar strategies to cope with the challenges of being active at night in tropical forests.

Behavior , ecology and demography of owl monkeys ( Aotus vociferans ) in Yasuní National Park , Ecuador

TLDR
A comparison of tropical owl monkeys with more temperate Aotus azarai from the Argentinean Gran Chaco reveals that grouping patterns, day range length, and territory size are relatively conserved across the genus despite dramatic differences in body size and activity pattern.
...

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