Is it stochastic? Chaoborus larvae bioturbation likely affect the timing of daily methane (CH4) ebullitive flux in a tropical reservoir

Controlling factors of CH 4 ebullitive flux are still poorly understood within daily timescales in aquatic environments. Here, we explored if Chaoborus larvae bioturbation can influence the timing of daily CH 4 ebullitive flux and how this emission pathway is affected considering direct observations...

Full description

Saved in:
Bibliographic Details
Published in:Hydrobiologia 2020-09, Vol.847 (15), p.3291-3308
Main Authors: Bezerra, Mariana Peifer, McGinnis, Daniel Frank, Bezerra-Neto, José Fernandes, Barbosa, Francisco Antônio Rodrigues
Format: Article
Language:English
Subjects:
Acoustic surveying
Aquatic ecosystems
Aquatic environment
Atmosphere
Benthos
Biomedical and Life Sciences
Bioturbation
Bubbles
Chaoborus
Daily
Ecology
Emission
Emissions
Fluctuations
Flux
Freshwater & Marine Ecology
Larvae
Life Sciences
Methane
Primary Research Paper
Reservoirs
Sediments
Sediments (Geology)
Surveys
Tropical climate
Underwater acoustics
Zoology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Controlling factors of CH 4 ebullitive flux are still poorly understood within daily timescales in aquatic environments. Here, we explored if Chaoborus larvae bioturbation can influence the timing of daily CH 4 ebullitive flux and how this emission pathway is affected considering direct observations in a tropical reservoir. For this, we collected CH 4 bubbles on two different days and three sampling periods: 1–4 pm, 4–7 pm and 7–10 pm. In the middle of each period, we collected Chaoborus larvae, chemical, and environmental variables and acoustically surveyed the underwater environment. We found similar temporal patterns of CH 4 emissions between the periods in both days. The intervals of higher CH 4 ebullitive flux (1–4 pm and 4–7 pm) appeared to correspond with the exit period of Chaoborus larvae from sediment (2:30 pm to 5:30 pm). Furthermore, the density of benthic larvae, a proxy of the bioturbation intensity, was the only variable that significantly correlated with the ebullitive flux, presenting a high and positive relation. Our findings suggest that the stochastic nature of the CH 4 ebullitive flux may not be absolute truth, and this emission pathway might be enhanced daily by a Chaoborus -driven physical disturbance.
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-020-04331-w