Darras, Kevin Felix Arno

[["dc.bibliographiccitation.firstpage","229"],["dc.bibliographiccitation.journal","F1000Research"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Darras, Kevin"],["dc.contributor.author","Rahman, Dedi"],["dc.contributor.author","Sugito, Waluyo"],["dc.contributor.author","Mulyani, Yeni"],["dc.contributor.author","Prawiradilaga, Dewi"],["dc.contributor.author","Rozali, Agus"],["dc.contributor.author","Fitriawan, Irfan"],["dc.contributor.author","Tscharntke, Teja"],["dc.date.accessioned","2021-06-01T10:48:16Z"],["dc.date.available","2021-06-01T10:48:16Z"],["dc.date.issued","2018"],["dc.description.abstract","Background: Tropical lowland rainforests are threatened by deforestation and degradation worldwide. Relatively little research has investigated the degradation of the forests of South-east Asia and its impact on biodiversity, and even less research has focused on the important peat swamp forests of Indonesia, which experienced major losses through severe fires in 2015. Methods: We acoustically sampled the avifauna of the Berbak National Park in 2013 in 12 plots split in three habitats: primary swamp forest, secondary swamp forest, and shrub swamp, respectively representing non-degraded, previously selectively logged, and burned habitats. We analysed the species richness, abundance, vocalisation activity, and community composition across acoustic counts, plots, feeding guilds and IUCN Red List categories. We also analysed community-weighted means of body mass, wing length, and distribution area. Results: The avifauna in the three habitats was remarkably similar in richness, abundance and vocalisation activity, and communities mainly differed due to a lower prevalence of understory insectivores (Old-World Babblers, Timaliidae) in shrub swamp. However primary forest retained twice as many conservation-worthy species as shrub swamp, which harboured heavier, probably more mobile species, with larger distributions than those of forest habitats. Conclusions: The National Park overall harboured higher bird abundances than nearby lowland rainforests. Protecting the remaining peat swamp forest in this little-known National Park should be a high conservation priority in the light of the current threats coming from wildlife trade, illegal logging, land use conversion, and man-made fires."],["dc.identifier.doi","10.12688/f1000research.13996.2"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85873"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.eissn","2046-1402"],["dc.title","Birds of primary and secondary forest and shrub habitats in the peat swamp of Berbak National Park, Sumatra"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1928"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Methods in Ecology and Evolution"],["dc.bibliographiccitation.lastpage","1938"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Darras, Kevin"],["dc.contributor.author","Furnas, Brett"],["dc.contributor.author","Fitriawan, Irfan"],["dc.contributor.author","Mulyani, Yeni"],["dc.contributor.author","Tscharntke, Teja"],["dc.date.accessioned","2020-12-10T18:26:39Z"],["dc.date.available","2020-12-10T18:26:39Z"],["dc.date.issued","2018"],["dc.description.abstract","1.Autonomous sound recorders are increasingly used to survey birds, and other wildlife taxa. Species richness estimates from sound recordings are usually compared with estimates obtained from established methods like point counts, but so far the comparisons were biased: Detection ranges usually differ between the survey methods, and bird detection distance data are needed for standardizing data from sound recordings. 2.We devised and tested a method for estimating bird detection distances from sound recordings, using a reference recording of test sounds at different frequencies, emitted from known distances. We used our method to estimate bird detection distances in sound recordings from tropical forest sites where point counts were also used. We derived bird abundance and richness measures and compared them between point counts and sound recordings using unlimited radius and fixed radius counts, as well as distance sampling modelling. 3.First we show that it is possible to accurately estimate bird detection distances in sound recordings. We then demonstrate that these data can be used to standardize the detection ranges between point counts and sound recordings with a fixed‐radius approach, leading to higher abundance and richness estimates for sound recordings. Our distance‐sampling approach also revealed that sound recorders sampled significantly higher bird densities than human point counts. 4.We show for the first time that it is possible to standardize detection ranges in sound recordings and that distance sampling can successfully be used too. We revealed that birds were flushed by human observers and that this possibly leads to lower density estimates in point counts, although sound recorders could also have sampled more birds because of their earlier deployment times. Sound recordings are more amenable to distance‐sampling modelling than point counts as they do not exhibit an observer‐induced avoidance effect, and they can easily collect more replicates for obtaining more accurate bird density estimates. Quantifying bird detection distances was so far one important shortcoming that hindered the adoption of modern autonomous sound recording methods for ecological surveys. This article is protected by copyright. All rights reserved."],["dc.identifier.doi","10.1111/2041-210X.13031"],["dc.identifier.eissn","2041-210X"],["dc.identifier.issn","2041-210X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76150"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien)"],["dc.relation","SFB 990 | B | B09: Oberirdische Biodiversitätsmuster und Prozesse in Regenwaldtransformations-Landschaften"],["dc.relation.issn","2041-210X"],["dc.subject.gro","sfb990_journalarticles"],["dc.title","Estimating bird detection distances in sound recordings for standardizing detection ranges and distance sampling"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Darras, Kevin"],["dc.contributor.author","Batáry, Péter"],["dc.contributor.author","Furnas, Brett"],["dc.contributor.author","Fitriawan, Irfan"],["dc.contributor.author","Mulyani, Yeni"],["dc.contributor.author","Tscharntke, Teja"],["dc.date.accessioned","2019-07-23T08:45:21Z"],["dc.date.available","2019-07-23T08:45:21Z"],["dc.date.issued","2017"],["dc.description.abstract","Autonomous sound recording techniques have gained considerable traction in the last decade, but the question still remains whether they can replace human observation surveys to sample some animal taxa. Especially bird survey methods have been tested using classical point counts and autonomous sound recording techniques. We review the latest information by comparing both survey methods' standardization, verifiability, sampling completeness, data types, compatibility, and practicality by means of a systematic review and a meta-analysis of alpha and gamma species richness levels sampled by both methods across 20 separate studies. Although sound recording surveys have hitherto not enjoyed the most effective setups, they yield very similar results in terms of alpha and gamma species richness. We also reveal the crucial importance of the microphone (high signal-to-noise ratio) as the sensor that replaces human senses. We discuss key differences between both methods, while richness estimates are closely related and 81% of all species were detected by both methods. Sound recording techniques provide a more powerful and promising tool to monitor birds in a standardized, verifiable, and exhaustive way against the golden standard of point counts. Advantages include the capability of sampling continuously through day or season and of difficult-to-reach regions in an autonomous way, avoidance of observer bias and human disturbance effects and higher detection probability of rare species due to extensive recordings."],["dc.identifier.doi","10.1101/117119"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61898"],["dc.language.iso","en"],["dc.title","Autonomous Bird Sound Recording Outperforms Direct Human Observation: Synthesis And New Evidence"],["dc.type","preprint"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]