Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam

We studied the annual dynamics of the biotic component of the acoustic environment in a lowland monsoon tropical forest. The study was conducted in Nam Cat Tien National Park (southern Vietnam) from January 2013 to January 2014. We placed an autonomous recorder at the Nam Cat Tien ecosystem flux obs...

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Autores principales:	Alexey Opaev, Svetlana Gogoleva, Igor Palko, Van Thinh Nguyen, Viatcheslav Rozhnov
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Monsoon tropical forest Ecoacoustics Acoustic indices Annual dynamic of acoustic activity Dry-wet season alternation Air humidity Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/7ad2d5f6779444efaf14db8e23fbeaad
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spelling	oai:doaj.org-article:7ad2d5f6779444efaf14db8e23fbeaad2021-12-01T04:41:08ZAnnual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam1470-160X10.1016/j.ecolind.2020.107269https://doaj.org/article/7ad2d5f6779444efaf14db8e23fbeaad2021-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20312097https://doaj.org/toc/1470-160XWe studied the annual dynamics of the biotic component of the acoustic environment in a lowland monsoon tropical forest. The study was conducted in Nam Cat Tien National Park (southern Vietnam) from January 2013 to January 2014. We placed an autonomous recorder at the Nam Cat Tien ecosystem flux observation station at a height of 35 m. For the analysis, we selected 1–4 5-min recordings per day collected at 5.30 a.m., 12.00 a.m., 4.00 p.m., and 8.00 p.m. For each recording, we calculated four acoustic indices: the acoustic complexity index (ACI), the bioacoustic index (BIO), the acoustic diversity index (ADI) and the acoustic evenness index (AEI). These indices had roughly similar annual dynamics and peaked from May to August (i.e., immediately before the wet season and in the wet season). We then related the four acoustic indices to the daily values of the following meteorological variables: air temperature, air relative humidity, solar radiation, and precipitation sum. The BIO, ADI and AEI were most influenced by daily average humidity. We therefore concluded that humidity rather than precipitation, temperature or radiation was the best predictor of the annual dynamics of acoustic activity in Nam Cat Tien. The increase in humidity was apparent several months before the major rains began in 2013 (i.e., before the wet season). We suggest that future ecoacoustics studies in the tropics should give greater consideration to humidity as a variable determining the acoustic activity of local fauna.Alexey OpaevSvetlana GogolevaIgor PalkoVan Thinh NguyenViatcheslav RozhnovElsevierarticleMonsoon tropical forestEcoacousticsAcoustic indicesAnnual dynamic of acoustic activityDry-wet season alternationAir humidityEcologyQH540-549.5ENEcological Indicators, Vol 122, Iss , Pp 107269- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Monsoon tropical forest Ecoacoustics Acoustic indices Annual dynamic of acoustic activity Dry-wet season alternation Air humidity Ecology QH540-549.5
spellingShingle	Monsoon tropical forest Ecoacoustics Acoustic indices Annual dynamic of acoustic activity Dry-wet season alternation Air humidity Ecology QH540-549.5 Alexey Opaev Svetlana Gogoleva Igor Palko Van Thinh Nguyen Viatcheslav Rozhnov Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam
description	We studied the annual dynamics of the biotic component of the acoustic environment in a lowland monsoon tropical forest. The study was conducted in Nam Cat Tien National Park (southern Vietnam) from January 2013 to January 2014. We placed an autonomous recorder at the Nam Cat Tien ecosystem flux observation station at a height of 35 m. For the analysis, we selected 1–4 5-min recordings per day collected at 5.30 a.m., 12.00 a.m., 4.00 p.m., and 8.00 p.m. For each recording, we calculated four acoustic indices: the acoustic complexity index (ACI), the bioacoustic index (BIO), the acoustic diversity index (ADI) and the acoustic evenness index (AEI). These indices had roughly similar annual dynamics and peaked from May to August (i.e., immediately before the wet season and in the wet season). We then related the four acoustic indices to the daily values of the following meteorological variables: air temperature, air relative humidity, solar radiation, and precipitation sum. The BIO, ADI and AEI were most influenced by daily average humidity. We therefore concluded that humidity rather than precipitation, temperature or radiation was the best predictor of the annual dynamics of acoustic activity in Nam Cat Tien. The increase in humidity was apparent several months before the major rains began in 2013 (i.e., before the wet season). We suggest that future ecoacoustics studies in the tropics should give greater consideration to humidity as a variable determining the acoustic activity of local fauna.
format	article
author	Alexey Opaev Svetlana Gogoleva Igor Palko Van Thinh Nguyen Viatcheslav Rozhnov
author_facet	Alexey Opaev Svetlana Gogoleva Igor Palko Van Thinh Nguyen Viatcheslav Rozhnov
author_sort	Alexey Opaev
title	Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam
title_short	Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam
title_full	Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam
title_fullStr	Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam
title_full_unstemmed	Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam
title_sort	annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in south vietnam
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/7ad2d5f6779444efaf14db8e23fbeaad
work_keys_str_mv	AT alexeyopaev annualacousticdynamicsareassociatedwithseasonalityinamonsoontropicalforestinsouthvietnam AT svetlanagogoleva annualacousticdynamicsareassociatedwithseasonalityinamonsoontropicalforestinsouthvietnam AT igorpalko annualacousticdynamicsareassociatedwithseasonalityinamonsoontropicalforestinsouthvietnam AT vanthinhnguyen annualacousticdynamicsareassociatedwithseasonalityinamonsoontropicalforestinsouthvietnam AT viatcheslavrozhnov annualacousticdynamicsareassociatedwithseasonalityinamonsoontropicalforestinsouthvietnam
_version_	1718405812260438016

Annual acoustic dynamics are associated with seasonality in a monsoon tropical forest in South Vietnam

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