Environment and Biota of the Patos Lagoon Estuary

Calliari, Lauro Júlio; Garcia, Carlos Alberto Eiras; Niencheski, Luís Felipe Hax; Baumgarten, M.G.Z; Costa, César Serra Bonifácio; Seeliger, U.; Abreu, Paulo César; Odebrecht, Clarisse; Montu, M.; Duarte, Anette Kümmel; Gloeden, I. M.; Bemvenuti, Carlos Emílio; Santos, E. A.; Bianchini, Adalto; Sinque, Chossi; Muelbert, Jose H; Vieira, João Paes; Castello, Jorge Pablo; Vooren, Carolus Maria; Pinedo, Maria Cristina

doi:10.1007/978-3-642-60467-6_4

Cited by 9 publications

(9 citation statements)

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“…In that study, O. argentinensis emerged as the most recently derived marine species of the genus, having as ancestor a group of freshwater species that diversified during the Pleistocene. The presumed Pleistocene age of O. argentinensis is also consistent with the geological history of formation of estuarine environments in southern Brazil (Calliari 1997) and with its close evolutionary association with the recently radiated O. perugiae complex (details in Beheregaray et al. 2002).…”

Section: Discussionsupporting

confidence: 78%

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Fine‐scale genetic structure, estuarine colonization and incipient speciation in the marine silverside fishOdontesthes argentinensis

2001

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The identification of incipient ecological species represents an opportunity to investigate current evolutionary process where adaptive divergence and reproductive isolation are associated. In this study we analysed the genetic structure of marine and estuarine populations of the silverside fish Odontesthes argentinensis using nine microsatellite loci and 396 bp of the mitochondrial DNA (mtDNA) control region. Our main objective was to investigate the relationship among estuarine colonization, divergent selection and speciation in silversides. Significant genetic structure was detected among all marine and estuarine populations. Despite the low phylogeographic structure in mtDNA haplotypes, there was clear signal of local radiations of haplotypes in more ancient populations. Divergence among marine populations was interpreted as a combined result of homing behaviour, isolation by distance and drift. On the other hand, ecological shifts due to the colonization of estuarine habitats seem to have promoted rapid adaptive divergence and reproductive isolation in estuarine populations, which were considered as incipient ecological species. This conclusion is supported by the existence of a set of environmental factors required for successful reproduction of estuarine ecotypes. The pattern of genetic structure indicates that phenotypic and reproductive divergence evolved in the face of potential gene flow between populations. We suggest that the 'divergence-with-gene-flow' model of speciation may account for the diversification of estuarine populations. The approach used can potentially identify 'incipient estuarine species', being relevant to the investigation of the evolutionary relationships of silversides in several coastal regions of the world.

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Section: Discussionsupporting

confidence: 78%

“…Custódia), possibly because they were colonized much more recently. For instance, estuarine conditions in Patos Lagoon date from the Pleistocene (Calliari 1997), whereas Custódia Lagoon was formed as a result of a regressive episode that followed the marine transgression of 5000 years ago (Villwock et al . 1986).…”

Section: Discussionmentioning

confidence: 99%

Fine‐scale genetic structure, estuarine colonization and incipient speciation in the marine silverside fishOdontesthes argentinensis

2001

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“…During the following prolonged regression, lasting between 60 000 and 17 000 years, the northern area evolved as a group of isolated freshwater lakes not reached by subsequent marine transgressions (Schwarzbold & Schäeffer 1984;Villwock & Tomazelli 1995). By contrast, the southern Patos-Mirim is geomorphologically classified as a partially closed lagoon (Calliari 1997). For instance, sedimentary structures and radiocarbon dating of marine fossils revealed the presence of estuarine conditions in Mirim Lake in periods as recent as 4900-4300 ya (Buchmann et al 1998).…”

Section: Discussionmentioning

confidence: 99%

“…The last significant marine transgression (maximum peak around 5000 ya) was followed by two regressive movements that formed barrier IV, the most recent barrier system of the CPRS (Villwock et al 1986). This barrier, composed of beach ridges and adjacent dunes, moulded the modern Patos Lagoon estuary (Calliari 1997) and created stable freshwater environments in Mirim Lake by isolating it from the sea (Villwock et al 1986). In the outer edge of the northern CPRS, two elongated groups of interconnected lakes were formed in the gap between barriers III and IV (Schwarzbold & Schäeffer 1984;Villwock et al 1986) Furthermore, especially for southern species, most mtDNA haplotypes seem to have originated in a very recent past: they are rare, lie in the periphery of the network, and are connected independently to the most common ones via short branches (Avise 2000).…”

Section: Discussionmentioning

confidence: 99%

A rapid fish radiation associated with the last sea-level changes in southern Brazil: the silversideOdontesthes perugiaecomplex

Beheregaray

Sunnucks

Briscoe

2002

Proc. R. Soc. Lond. B

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Coastal freshwater fishes provide valuable models for studying the role of the last glaciations in promoting speciation. To date, the great majority of studies are of Northern Hemisphere taxa, and reflect the influence of vicariant events during, or prior to, the Pleistocene. Microsatellite markers and mitochondrial DNA sequences were used to investigate patterns of population divergence and evolutionary relationships in a freshwater group of silverside fishes (Odontesthes perugiae complex), endemic to the recently formed coastal plain of southern Brazil. Lacustrine morphotypes showed concordant patterns of genetic and morphological divergence consistent with the geographical history of the coastal plain. The results support the proposal of a silverside radiation chronologically shaped by the sea-level changes of the Pleistocene and Holocene. The radiating lineage comprises a minimum of three allopatric and two sympatric lacustrine species. Four species displayed extremely high levels of genetic variation and some of the most rapid speciation rates reported in fishes. These features were related to a marine-estuarine origin of the radiation. To the best of our knowledge, this study represents the first molecular phylogeographic survey of a coastal radiation in South America.

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“…1). The estuarine area covers the southern part of the Patos Lagoon, where a single channel links the lagoon to the South Atlantic Ocean (Garcia 1997).…”

Section: The Patos Lagoon Estuarymentioning

confidence: 99%

Siltation in the Navigation Channel of Patos Lagoon Estuary, Brazil, Considering the Current Configuration of the Jetties and the Channel

Silva

Fontoura

Corrêa

et al. 2023

Preprint

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The sediment dynamics, mainly the deposition processes, is one of the most important aspects concerning ports. Understanding sediment patterns is vital for port management since it supports the search for strategies that minimize siltation or promote more sustainable management. This study aims to assess the morphological characteristics and siltation patterns of the access channel to the Patos Lagoon estuary, after the modifications made in the jetties geometry and in the channel configuration in the late 2000s. The Port of Rio Grande, one of the largest in Brazil, is located on the west margin of the inlet. Bathymetric data provided by the Port Authority from 2015 to 2020 were used to generate digital elevation models and then assess the net sedimentation rates and the evolution of the channel bottom over time. Results indicate a significant variability of net sedimentation rates. The volume of sediment deposited on the channel bottom in approximately one year was roughly 2.5 times greater than that deposited in 2 years and 3 months. The entrance area, covered by rectangles 3B-4C (which represented 34% of the study area), was responsible for about 50% of the net sedimentation volume in both analyzed periods. The area between jetties (3E-4C) showed major net sedimentation rates in both periods. The analysis of the bathymetric data series was effective in evaluating important morphological characteristics of the channel, and it was possible to identify aspects of siltation patterns and obtain yielded unprecedented results.

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Environment and Biota of the Patos Lagoon Estuary

Cited by 9 publications

References 0 publications

Fine‐scale genetic structure, estuarine colonization and incipient speciation in the marine silverside fishOdontesthes argentinensis

Fine‐scale genetic structure, estuarine colonization and incipient speciation in the marine silverside fishOdontesthes argentinensis

A rapid fish radiation associated with the last sea-level changes in southern Brazil: the silversideOdontesthes perugiaecomplex

Siltation in the Navigation Channel of Patos Lagoon Estuary, Brazil, Considering the Current Configuration of the Jetties and the Channel

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