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29 results for “howler monkeys”
Data from: Feeding strategies of brown howler monkeys in response to variations in food availability
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Seed traits of seed within spider monkey, howler monkey feces, and dung beetles' dung balls
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Data from: Successional loss of two key food tree species best explains decline in group size of Panamanian howler monkeys (Alouatta palliata)
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Cumulative germination of seeds ingested by black howler monkeys
<p><strong>Premise of the Study:</strong> Primates are important seed dispersers, especially for large-seeded (> 1 cm length) tropical species in continuous and fragmented rainforests.</p> <p><strong>Methods:</strong> In three forest fragments within the Montes Azules Biosphere Reserve, southern Mexico, we investigated the effect of howler monkeys´ (Alouatta pigra) gut passage on the germination rate and maximum germination (%) of native large-seeded species. One group of howler monkeys, per fragment, was followed and fresh feces collected. Large seeds were removed to compare their germination success with non-ingested seeds of the same species collected underneath parent plants.</p> <p><strong>Results:</strong> Feces contained large seeds from seven tree species and one liana species: Ampelocera hottlei, Castilla elastica, Dialium guianense, Garcinia intermedia, Pourouma bicolor, Spondias mombin, Trophis racemosa and the liana Abuta panamensis. Except for G. intermedia, ingested seeds showed significantly greater germination rates than non-ingested seeds. Non-ingested seeds of D. guianense showed negligible germination. Regarding maximum germination, ingested seeds of D. guianense, P. bicolor, S. mombin, T. racemosa and A. panamensis showed significantly greater germination percentage; while G. intermedia showed significantly lower germination percentage and no effect of seed ingestion was observed on A. hottlei and C. elastica.</p> <p><strong>Conclusions:</strong> In general, seed ingestion by howler monkeys confers greater germination rates than non-ingested seeds. Greater germination rates reduce predation probabilities and increases seedling establishment in forest fragments. Primate dispersal services contribute to germination heterogeneity within plant populations of old-growth forest species and to their persistence in forest fragments.</p>
Cognitive maps in the wild: Revealing the use of metric information in black howler monkeys' route navigation
<p>When navigating, wild animals rely on internal representations of the external world to take movement decisions – called "cognitive maps". As a rule, flexible navigation is hypothesized to be supported by sophisticated spatial skills (i.e., Euclidean cognitive maps); however, constrained movements along habitual routes is the most commonly reported navigation strategy. Even though incorporating metric information (i.e., distances and angles between locations) in route-based cognitive maps would likely enhance an animal's navigation efficiency, there has been no evidence of this strategy reported for non-human animals to date. Here, we examine the properties of the cognitive map used by a wild population of primates by testing a series of cognitive hypotheses against spatially-explicit movement simulations. We collected 3104 hours of ranging and behavioural data on five groups of black howler monkeys (<i>Alouatta pigra</i>) at Palenque National Park, Mexico, from September 2016 through August 2017. We simulated correlated-random walks mimicking the ranging behaviour of the study subjects and tested for differences between observed and simulated movement patterns. Our results indicated that black howler monkeys engaged in constrained movement patterns characterized by a high path recursion tendency, which limited their capacity to travel in straight lines and approach feeding trees from multiple directions. In addition, we found that the structure of observed route networks was more complex and efficient than simulated route networks, suggesting that black howler monkeys incorporate metric information into their cognitive map. Our findings not only expand the use of metric information during route navigation to non-human animals but also highlight the importance of considering efficient route-based navigation as a cognitively demanding mechanism.</p>
The role of howler monkeys (Alouatta caraya) in the primary succession of the Paraná flooded forest (Argentina)
<p>In disturbed forests, Atelidae primates, such as howler monkeys, are known to play a key role in the dynamics of secondary succession. However, little is known about their role in primary succession. Thus, the aim of the present study was to evaluate the role of the howler monkey <i>Alouatta caraya</i> in the primary succession dynamics of the Paraná flooded forest, in northeastern Argentina. This was achieved by studying the recruitment of saplings in the latrines of <i>A. caraya</i> groups inhabiting the forest in the first stages of succession and the distribution of plant species in relation to the age of the forest. The results showed that: (a) young forest areas were dominated by tree species dispersed by water, wind, birds, bats and fishes, whereas older forest areas were dominated by species dispersed by <i>A. caraya</i>,<i> </i>with individuals of some species present in young forests; (b) the floristic composition of saplings growing in <i>A. caraya</i> latrines of young forest areas was similar to that of old forest areas; and (c) saplings growing in young forest areas were heavily associated with <i>A. caraya</i> latrines and corresponded to species from older forest areas. The results allow the conclusion that <i>A. caraya</i> plays a role in the last phase of primary succession of the Paraná flooded forest, as well as in contributing to an increase in the structural complexity and species diversity in the young areas of the Paraná islands.</p>
Cumulative germination of seeds ingested by black howler monkeys
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Cognitive maps in the wild: Revealing the use of metric information in black howler monkeys' route navigation
Open the record for dataset details and reuse information.
The role of howler monkeys (Alouatta caraya) in the primary succession of the Paraná flooded forest (Argentina)
Open the record for dataset details and reuse information.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.