Assessing the effects of survey-inherent disturbance on primate detectability: Recommendations for line transect distance sampling. Dataset

Version 1.2
Bessone, Mattia; Kühl, Hjalmar; Herbinger, Ilka; N'Goran, Kouame Paul; Asanzi, Papy; Da Costa, Barros Pedro; Dérozier, Violette; Fotsing, Dadis Bush Ernest; Ikembelo, Beka Bernard; Iyomi, Mpongo Dieumerci; Iyatshi, Iyomi Bernard; Kafando, Pierre; Kambere, Mbangi Augistin; Moundzoho, Dissondet Baudelaire; Musubaho, Kako Loving; Fruth, Barbara, 2022, "Assessing the effects of survey-inherent disturbance on primate detectability: Recommendations for line transect distance sampling. Dataset", https://doi.org/10.17617/3.C0HBLR, Edmond, V1
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Description
Habitat destruction and over-hunting are increasingly threatening the arboreal primates of Central Africa. To establish effective conservation strategies, accurate assessments of primate density, abundance and spatial distribution are required. To date, the method of choice for primate density estimation is line transect distance sampling. However, primates fleeing human observers violate methodological assumptions, biasing the accuracy of resulting estimates. In this study, we used line transect distance sampling to study 5 primate species along 378 km of transects in Salonga National Park, Democratic Republic of the Congo. We tested the effect of different levels of survey-inherent disturbance (i.e. cutting) on the number of observed i) primate groups, and ii) individuals within groups, by counting groups at 3 different time lags after disturbance of the transect, i) a minimum of 3 hours, ii) 24 hours, iii) a minimum of 3 days. We found that survey-inherent disturbance led to underestimated densities, affecting both the number of encountered groups and of observed individuals. However, the response varied between species due to species-specific ecological and behavioural features. Piliocolobus tholloni and Colobus angolenis resumed an unaltered behaviour only 24 hours after disturbance, while Lophocebus aterrimus, Cercopithecus ascanius and Cercopithecus wolfi required a minimum of 10 days. To minimize bias in density estimates, future surveys using line transect distance sampling should be designed considering survey-inherent disturbance. We recommend evaluating the factors driving primate response, including habitat type, niche occupation and hunting pressure, peculiar to the survey specific area and primate community under study.
Subject Biology
Related Publication Assessing the effects of survey-inherent disturbance on primate detectability: Recommendations for line transect distance sampling
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Bessone_etal_2022_survey_inherent_disturbance_DATA.xlsx
MS Excel Spreadsheet - 118.4 KB
Published Nov 29, 2022
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MD5: a11ba03e4df3aea4720deba1db1841ce
Data used in the study. The file contains 3 data-sheets: 1) Metadata - include a description of column names and abbreviations 2) Encounter rate & Group size - include data used for between passage and between species comparisons 3) Distance sampling - include data used to estimate primate density
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