Local habitat use by botos (Amazon river dolphins,Inia geoffrensis) using passive acoustic methods

2015 ◽  
Vol 32 (1) ◽  
pp. 220-240 ◽  
Author(s):  
Yukiko Yamamoto ◽  
Tomonari Akamatsu ◽  
Vera M. F. da Silva ◽  
Shiro Kohshima
Keyword(s):  
Habitat Use ◽  
Amazon River ◽  
Acoustic Methods ◽  
Inia Geoffrensis ◽  
Passive Acoustic ◽  
Local Habitat

Etho-ecological study of the Amazon River dolphin, Inia geoffrensis (Cetacea: Iniidae), and the dolphins of the genus Sotalia (Cetacea: Delphinidae) in Guamá River, Amazonia

2012 ◽  
Vol 5 ◽  
Author(s):  
Gabriel M.A. Dos Santos ◽  
Adriano C. Quaresma ◽  
Rafael R. Barata ◽  
Bruna M.L. Martins ◽  
Salvatore Siciliano ◽  
...  
Keyword(s):  
Ecological Study ◽  
Amazon River ◽  
River Dolphin ◽  
Inia Geoffrensis

scholarly journals Stingray Habitat Use Is Dynamically Influenced by Temperature and Tides

2022 ◽  
Vol 8 ◽  
Author(s):  
Chantel Elston ◽  
Paul D. Cowley ◽  
Rainer G. von Brandis ◽  
James Lea
Keyword(s):  
Habitat Use ◽  
Acoustic Telemetry ◽  
Monsoon Season ◽  
Abiotic Factors ◽  
Environmental Drivers ◽  
Shallow Waters ◽  
Shallow Marine ◽  
Tidal Cycles ◽  
Management Plans ◽  
Passive Acoustic

Abiotic factors often have a large influence on the habitat use of animals in shallow marine environments. Specifically, tides may alter the physical and biological characteristics of an ecosystem while changes in temperature can cause ectothermic species to behaviorally thermoregulate. Understanding the contextual and relative influences of these abiotic factors is important in prioritizing management plans, particularly for vulnerable faunal groups like stingrays. Passive acoustic telemetry was used to track the movements of 60 stingrays at a remote and environmentally heterogeneous atoll in Seychelles. This was to determine if habitat use varied over daily, diel and tidal cycles and to investigate the environmental drivers behind these potential temporal patterns. Individuals were detected in the atoll year-round, but the extent of their movement and use of multiple habitats increased in the warmer NW-monsoon season. Habitat use varied over the diel cycle, but was inconsistent between individuals. Temperature was also found to influence stingray movements, with individuals preferring the deeper and more thermally stable lagoon habitat when extreme (hot or cold) temperature events were observed on the flats. Habitat use also varied over the tidal cycle with stingrays spending a higher proportion of time in the lagoon during the lowest tides, when movement on the flats were constrained due to shallow waters. The interplay of tides and temperature, and how these varied across diel and daily scales, dynamically influenced stingray habitat use consistently between three species in an offshore atoll.

scholarly journals Passive acoustic methods for tracking the 3D movements of small cetaceans around marine structures

PLoS ONE ◽  
2020 ◽  
Vol 15 (5) ◽  
pp. e0229058 ◽  
Author(s):  
Douglas Gillespie ◽  
Laura Palmer ◽  
Jamie Macaulay ◽  
Carol Sparling ◽  
Gordon Hastie
Keyword(s):  
Marine Structures ◽  
Acoustic Methods ◽  
Passive Acoustic

scholarly journals Effectiveness of unmanned aerial vehicles to detect Amazon dolphins

Oryx ◽  
2019 ◽  
Vol 54 (5) ◽  
pp. 696-698 ◽  
Author(s):  
Marcelo Oliveira-da-Costa ◽  
Miriam Marmontel ◽  
Daiane S. X. da-Rosa ◽  
André Coelho ◽  
Serge Wich ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Amazon Basin ◽  
Accurate Estimate ◽  
Amazon River ◽  
Tropical Rivers ◽  
River Dolphin ◽  
Aerial Vehicles ◽  
Aerial Surveys ◽  
Inia Geoffrensis ◽  
Management And Conservation

AbstractQuantifying the abundance of species is essential for their management and conservation. Much effort has been invested in surveys of freshwater dolphins in the Amazon basin but river dimensions and complex logistics limit replication of such studies across the region. We evaluated the effectiveness of using unmanned aerial vehicles (UAVs) for surveying two Amazon dolphin species, the tucuxi Sotalia fluviatilis and pink river dolphin Inia geoffrensis, in tropical rivers. In 2016 we conducted drone and visual surveys over 80 km of the Juruá River in Brazil. The aerial surveys provided higher accuracy than human observers in counting individuals detected in groups. Compared to estimates derived from visual surveys, the use of UAVs could provide a more feasible, economical and accurate estimate of Amazon river dolphin populations. The method could potentially be replicated in other important areas for the conservation of these species, to generate an improved index of river dolphin populations in the Amazon.

scholarly journals THE SCIENTIFIC DISCOVERY OF THE AMAZON RIVER DOLPHIN INIA GEOFFRENSIS

1997 ◽  
Vol 13 (3) ◽  
pp. 419-426 ◽  
Author(s):  
A. Romero ◽  
A. I. Agudo ◽  
S. J. Blondell de Agudo
Keyword(s):  
Scientific Discovery ◽  
Amazon River ◽  
River Dolphin ◽  
Inia Geoffrensis
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