[MARMAM] New publication posting

Daniela Pivari danipivari at gmail.com
Thu Oct 28 06:46:47 PDT 2021

Dear friends,

We hope this finds you well. We wanted to share with the ListServ our 
new publication:

Pivari, D.; Pagliani, B.; Lemos, L.; Lima, D. & Gravena, W. 2021. 
Monitoring a critical population of the Bolivian river dolphin, Inia 
boliviensis, before and after closing the floodgates of a hydroelectric 
dam in the Amazon Basin, Brazil: A quantitative Analysis. Journal for 
Nature Conservation: https://doi.org/10.1016/j.jnc.2021.126082 



Dam constructions 
<https://www.sciencedirect.com/topics/earth-and-planetary-sciences/dam-construction> threaten 
aquatic fauna, degrading their habitats and causing population 
fragmentation. Environmental impact studies 
<https://www.sciencedirect.com/topics/earth-and-planetary-sciences/environmental-impact-study> were 
carried out from March 2010 to July 2015 as part of the licensing 
process concerning the Jirau Hydroelectric Dam construction, located on 
the Madeira River, Rondônia, Brazil, aiming to assess its impacts on the 
local fauna. The dam closed its gates in December 2012 and the water 
level rose from 2013 to 2015, creating a 468 km2 reservoir. Dams may be 
a source of negative effects to several species, including the Bolivian 
river dolphin, /Inia 
<https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/inia> boliviensis/, 
which have a restricted distribution in northern Bolivian rivers and 
part of the Madeira River Basin. This study evaluated the presence of 
/I. boliviensis/ in different sections of the Madeira River before 
reservoir filling (BRF) and after reservoir filling (ARF) through a 
quantitative analysis. Dolphins were actively searched along linear 
transects in four sections of the river: Abunã, Mutum, Caiçara and 
Canteiro, over 125 km (250 km round trip). A total effort of 986 h was 
carried out along 210 days during the hydrological seasons (falling, 
low, rising and high-water level). Twenty-nine (29) groups were recorded 
BRF in the direct dam influence area (N = 62), while thirty-eight (38) 
groups were documented ARF (N = 111). The highest number of sightings 
was recorded in Abunã during both periods: 24 in BRF (N = 50) and 33 in 
ARF (N = 101). The greatest number of dolphins was detected during the 
falling and low hydrological seasons: 19 in BRF (N = 48) and 30 in ARF 
(N = 92). This is expected, since decreasing water levels lead to a 
higher concentration of prey and, consequently, higher numbers of 
dolphins can be observed. Standardized methodology and experienced staff 
are essential to ensure adequate dolphin population estimates, 
especially in these critical habitats, where the main impacts caused by 
the dam are population fragmentation, isolation and extirpation, and 
reproductive segregation.

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