Update on the freshwater distribution of Sotalia in Colombia, Ecuador, Peru, Venezuela and Suriname

Gómez-Salazar, Catalina; Portocarrero-Aya, Marcela; Trujillo, Fernando; Caballero, Susana; Bolaños‐Jiménez, Jaime; Utreras, V.; McGuire, Tamara L.; Ferrer-Pérez, Arnaldo; Pool, Marijn Aimee; Aliaga-Rossel, Enzo

doi:10.5597/lajam00166

Cited by 9 publications

(6 citation statements)

References 20 publications

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“…(14). In comparison, South American Sotalia fluvatilis, a river dolphin, has a normal range that reaches an elevation of ∼100 m, where river depths are 10-30 m, 3,600 km up the Amazon drainage from the Atlantic Ocean (Table 1) (15). In each of these cases, the riverine distribution of modern cetaceans is facilitated by sufficient water discharge in low-gradient rivers and the absence of shallow bedrock rapids and waterfalls (15,16).…”

Section: Ziphiids and Other Cetaceans In Present-day And Paleoriversmentioning

confidence: 99%

A 17-My-old whale constrains onset of uplift and climate change in east Africa

Wichura

Jacobs

Lin

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Timing and magnitude of surface uplift are key to understanding the impact of crustal deformation and topographic growth on atmospheric circulation, environmental conditions, and surface processes. Uplift of the East African Plateau is linked to mantle processes, but paleoaltimetry data are too scarce to constrain plateau evolution and subsequent vertical motions associated with rifting. Here, we assess the paleotopographic implications of a beaked whale fossil (Ziphiidae) from the Turkana region of Kenya found 740 km inland from the present-day coastline of the Indian Ocean at an elevation of 620 m. The specimen is ∼17 My old and represents the oldest derived beaked whale known, consistent with molecular estimates of the emergence of modern straptoothed whales (Mesoplodon). The whale traveled from the Indian Ocean inland along an eastward-directed drainage system controlled by the Cretaceous Anza Graben and was stranded slightly above sea level. Surface uplift from near sea level coincides with paleoclimatic change from a humid environment to highly variable and much drier conditions, which altered biotic communities and drove evolution in east Africa, including that of primates.east Africa | Ziphiidae | uplift | drainage | paleoenvironment

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Section: Ziphiids and Other Cetaceans In Present-day And Paleoriversmentioning

confidence: 99%

A 17-My-old whale constrains onset of uplift and climate change in east Africa

Wichura

Jacobs

Lin

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…2002; Ruiz‐Garcia et al . 2006, 2007, 2008; Ruiz‐Garcia 2010) while the tucuxi, S. fluviatilis , is distributed in the Amazon (Brazil, Colombia, Ecuador, Peru, and French Guiana; Caballero et al 2007) and in the lower and middle Orinoco basin (Venezuela, Gomez‐Salazar et al . 2011 a ).…”

Section: Estimates Of Group Sizes Of River Dolphin Populations In Difmentioning

confidence: 99%

Ecological factors influencing group sizes of river dolphins (Inia geoffrensisandSotalia fluviatilis)

Gómez-Salazar

Trujillo²,

Whitehead

2011

Marine Mammal Science

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Living in groups is usually driven by predation and competition for resources. River dolphins do not have natural predators but inhabit dynamic systems with predictable seasonal shifts. These ecological features may provide some insight into the forces driving group formation and help us to answer questions such as why river dolphins have some of the smallest group sizes of cetaceans, and why group sizes vary with time and place. We analyzed observations of group size for Inia and Sotalia over a 9 yr period. In the Amazon, largest group sizes occurred in main rivers and lakes, particularly during the low water season when resources are concentrated; smaller group sizes occurred in constricted waters (channels, tributaries, and confluences) that receive an influx of blackwaters that are poor in nutrients and sediments. In the Orinoco, the largest group sizes occurred during the transitional water season when the aquatic productivity increases. The largest group size of Inia occurred in the Orinoco location that contains the influx of two highly productive whitewater rivers. Flood pulses govern productivity and major biological factors of these river basins. Any threats to flood pulses will likely have an effect on the functionality of these ecosystems and the species living in them.

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“…The riverine species, Sotalia fluviatilis , the tucuxi dolphin, is found along the Amazon River and most of its tributaries (da Silva and Best , ; Gómez‐Salazar et al . ).…”

Section: Normal Distribution Priors For Node Age Calibrations From Stmentioning

confidence: 97%

“…It is unclear whether animals are vagrants from the coast ( i.e ., are Sotalia guianensis ) or belong to a distinct species, genetically differentiated from both coastal and Amazonian groups (Caballero , Gómez‐Salazar et al . ). It is unlikely that these animals are Sotalia fluviatilis , since they have not been found in the Colombian Orinoco, which would be the closest connection to the Amazon River via the Casiquiare channel and the Negro River (Caballero et al .…”

Section: Normal Distribution Priors For Node Age Calibrations From Stmentioning

confidence: 97%