---
_id: '3770'
abstract:
- lang: eng
text: 'The pink dolphin (Inia geoffrensis) is widely distributed along the Amazon
and Orinoco basins, covering an area of approximately 7 million km2. Previous
morphological and genetic studies have proposed the existence of at least two
evolutionary significant units: one distributed across the Orinoco and Amazon
basins and another confined to the Bolivian Amazon. The presence of barriers in
the riverine environment has been suggested to play a significant role in shaping
present-day patterns of ecological and genetic structure for this species. In
the present study, we examined the phylogeographic structure, lineage divergence
time and historical demography using mitochondrial (mt)DNA sequences in different
pink dolphin populations distributed in large and small spatial scales, including
two neighbouring Brazilian Amazon populations. mtDNA control region (CR) analysis
revealed that the Brazilian haplotypes occupy an intermediate position compared
to three previously studied geographic locations: the Colombian Amazon, the Colombian
Orinoco, and the Bolivian Amazon. On a local scale, we have identified a pattern
of maternal isolation between two neighbouring populations from Brazil. Six mtDNA
CR haplotypes were identified in Brazil with no sharing between the two populations,
as well as specific cytochrome b (cyt b) haplotypes identified in each locality.
In addition, we analyzed autosomal microsatellites to investigate male-mediated
gene flow and demographic changes within the study area in Brazil. Data analysis
of 14 microsatellite loci failed to detect significant population subdivision,
suggesting that male-mediated gene flow may maintain homogeneity between these
two locations. Moreover, both mtDNA and microsatellite data indicate a major demographic
collapse within Brazil in the late Pleistocene. Bayesian skyline plots (BSP) of
mtDNA data revealed a stable population for Colombian and Brazilian Amazon lineages
through time, whereas a population decline was demonstrated in the Colombian Orinoco
lineage. Moreover, BSP and Tajima''s D and Fu''s Fs tests revealed a recent population
expansion exclusively in the Bolivian sample. Finally, we estimated that the diversification
of the Inia sp. lineage began in the Late Pliocene (approximately 3.1 Mya) and
continued throughout the Pleistocene.'
article_processing_charge: No
author:
- first_name: Claudia
full_name: Hollatz, Claudia
last_name: Hollatz
- first_name: Sibelle
full_name: Vilaça, Sibelle
last_name: Vilaça
- first_name: Rodrigo A
full_name: Fernandes Redondo, Rodrigo A
id: 409D5C96-F248-11E8-B48F-1D18A9856A87
last_name: Fernandes Redondo
orcid: 0000-0002-5837-2793
- first_name: Míriam
full_name: Marmontel, Míriam
last_name: Marmontel
- first_name: Cyndi
full_name: Baker, Cyndi
last_name: Baker
- first_name: Fabrício
full_name: Santos, Fabrício
last_name: Santos
citation:
ama: Hollatz C, Vilaça S, Fernandes Redondo RA, Marmontel M, Baker C, Santos F.
The Amazon River system as an ecological barrier driving genetic differentiation
of the pink dolphin (Inia geoffrensis). Biological Journal of the Linnean Society.
2011;102(4):812-827. doi:10.1111/j.1095-8312.2011.01616.x
apa: Hollatz, C., Vilaça, S., Fernandes Redondo, R. A., Marmontel, M., Baker, C.,
& Santos, F. (2011). The Amazon River system as an ecological barrier driving
genetic differentiation of the pink dolphin (Inia geoffrensis). Biological
Journal of the Linnean Society. Wiley. https://doi.org/10.1111/j.1095-8312.2011.01616.x
chicago: Hollatz, Claudia, Sibelle Vilaça, Rodrigo A Fernandes Redondo, Míriam Marmontel,
Cyndi Baker, and Fabrício Santos. “The Amazon River System as an Ecological Barrier
Driving Genetic Differentiation of the Pink Dolphin (Inia Geoffrensis).” Biological
Journal of the Linnean Society. Wiley, 2011. https://doi.org/10.1111/j.1095-8312.2011.01616.x.
ieee: C. Hollatz, S. Vilaça, R. A. Fernandes Redondo, M. Marmontel, C. Baker, and
F. Santos, “The Amazon River system as an ecological barrier driving genetic differentiation
of the pink dolphin (Inia geoffrensis),” Biological Journal of the Linnean
Society, vol. 102, no. 4. Wiley, pp. 812–827, 2011.
ista: Hollatz C, Vilaça S, Fernandes Redondo RA, Marmontel M, Baker C, Santos F.
2011. The Amazon River system as an ecological barrier driving genetic differentiation
of the pink dolphin (Inia geoffrensis). Biological Journal of the Linnean Society.
102(4), 812–827.
mla: Hollatz, Claudia, et al. “The Amazon River System as an Ecological Barrier
Driving Genetic Differentiation of the Pink Dolphin (Inia Geoffrensis).” Biological
Journal of the Linnean Society, vol. 102, no. 4, Wiley, 2011, pp. 812–27,
doi:10.1111/j.1095-8312.2011.01616.x.
short: C. Hollatz, S. Vilaça, R.A. Fernandes Redondo, M. Marmontel, C. Baker, F.
Santos, Biological Journal of the Linnean Society 102 (2011) 812–827.
date_created: 2018-12-11T12:05:04Z
date_published: 2011-04-01T00:00:00Z
date_updated: 2021-01-12T07:52:05Z
day: '01'
doi: 10.1111/j.1095-8312.2011.01616.x
extern: '1'
intvolume: ' 102'
issue: '4'
language:
- iso: eng
month: '04'
oa_version: None
page: 812 - 827
publication: Biological Journal of the Linnean Society
publication_status: published
publisher: Wiley
publist_id: '2457'
status: public
title: The Amazon River system as an ecological barrier driving genetic differentiation
of the pink dolphin (Inia geoffrensis)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 102
year: '2011'
...