The Food Niche Overlap and Interspecific Relationship between the Sympatric Tibetan Macaque and Grey Snub-Nosed Monkey

Abstract

Assessing the trophic niche and interspecific relationships between related species and determining how the species maintain differences in nutritional niches while coexisting in the same area are important topics in ecological research. Therefore, exploring the mechanism of food resource utilization, competition and coexistence among species distributed in the same region is important. In this study, we used fecal samples and metagenome sequencing technology to study the plant feeding habits and coexistence mechanisms of Tibetan macaques (Macaca thibetana) and grey snub-nosed monkeys (Rhinopithecus brelichi) within the same area. In the winter of 2020, we collected a total of 40 fecal samples from Tibetan macaques and grey snub-nosed monkeys; of those, 29 samples were considered valid and were analyzed using DNA metabarcoding. The results showed that in winter, Tibetan macaques consumed plants from 117 families and 184 genera, whereas grey snub-nosed monkeys consumed plants from 109 families and 165 genera. Diversity analysis revealed that there was a significant difference in the food composition of Tibetan macaques and grey snub-nosed monkeys. Tibetan macaques had a broader food niche width than grey snub-nosed monkeys at the family and genus levels. In winter, the food niches of Tibetan macaques and grey snub-nosed monkeys almost entirely overlapped (0.99). Our research provides detailed dietary data for Tibetan macaques and grey snub-nosed monkeys and valuable information that can aid in conservation efforts targeting these species.

Analysis of winter diet in Guizhou golden monkey (Rhinopithecus brelichi) using DNA metabarcoding data

“…We found that the top-ranked abundances of Magnoliaceae, Theaceae, Rosaceae, Viburnum, Cornus, and Nyssaceae have all been reported in previous R. brelichi dietary studies by traditional dietary analysis methods (Niu et al, 2014;Xiang et al, 2012;Yang et al, 2010). Eurya, Magnolia, Rubus and Morinda were reported to be present in the R. brelichi diet by DNA metabarcoding (Yue et al, 2023). In this study, Magnoliaceae was the top-ranked family in terms of the abundance of plant food species in R. brelichi, with a relative abundance of approximately 40%.…”

“…Lyke et al (2019) reported ecological niche differences in the dietary arthropods of blue-and red-tailed monkeys. DNA metabarcoding has also been reported in studies of colobine in plant diets, such as R. brelichi (Yue et al, 2023), Presbytis femoralis (Srivathsan et al, 2016) and Pygathrix nemaeus (Srivathsan et al, 2015). Collecting faeces does not involve coming into direct contact with the rare R. brelichi and does not affect their behavioural activities.…”