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Nov 18, 2022 · Ten night monkeys (Aotus lemurinus, five males and five females, age = 23.8 ± 6.8 y.o, body weight = 1.08 ± 0.08 kg) were used in this study. All animals were provided by the Center for the Evolutionary Origins of Human Behavior (former Primate Research Institute), Kyoto University (Inuyama, Japan).
Despite their adaptability, night monkeys face significant threats from habitat destruction due to deforestation and human encroachment (Helenbrook and Valdez 2021). These activities lead to habitat fragmentation, which can isolate populations and reduce genetic diversity.
- Species Occurrence
- Environmental Data
- Distribution Models
- Population Size Estimates and Threat Assessment
We constructed an occurrence data set (N = 75) of Aotus nigriceps observations throughout their range (Fig. 1; Supplementary Table 1), by using several available sources, including published manuscripts, field records provided by the Wildlife Conservation Society (Wallace et al. 2013), and citizen science data points (iNaturalist 2020) (Fig. 1b). T...
We used bioclimatic variables as environmental predictors based on their presumed ecological or physiological relationship to black-headed night monkey suitability as previously used in other neotropical primate studies (e.g., Holzmann et al. 2014; Rabelo et al. 2020). Climatic variables were downloaded from WorldClim version 2.1 (https://worldclim...
All statistical models and analyses were conducted using the R program (R Core Team 2020). We used Maxent version 3.4.1 (Phillips et al. 2017; Phillips and Dudík 2008) in the ‘dismo’ package (Hijmans et al. 2017) to develop a species distribution model for A. nigriceps by relating known geographic occurrences to available environmental variables to...
To estimate the loss of habitat over time we (1) calculated tree cover loss within their documented range from Global Forest Watch data layers (Hansen et al. 2013), and (2) calculated the area of their occurrence between 2000 and 2018 using the Maxent-modeled species distribution. We then used the lower population density estimates summarized from ...
- William D. Helenbrook, Jose W. Valdez
- 2021
Night monkey species, including A. nigriceps, are fairly common in the local pet trade in Amazonian regions of Peru and Brazil. © The IUCN Red List of Threatened Species: Aotus nigriceps – published in 2021.
Night monkeys are nocturnal: they are most active at dawn and dusk. The only exception is Aotus azarae azarae of the Chaco of southern Bolivia, Paraguay and Argentina, which is cathemeral (active during
Jun 12, 2021 · In this study, we examined the anthropogenic impact on the widely distributed black-headed night monkey, Aotus nigriceps, whose distribution and population status have yet to be assessed.
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May 1, 2022 · We found nine lineages of night monkeys distributed in two main clades and, as suggested in previous studies, the clades are not concordant with Hershkovitz’s species groups, and thus we propose a reclassification of the genus.
