Brazilian wetlands: their definition, delineation, and classification for research, sustainable management, and protection

Junk, Wolfgang J.; Piedade, Maria Teresa Fernandez; Lourival, Reinaldo; Wittmann, Florian; Kandus, Patricia; Lacerda, Luiz Drude de; Bozelli, Reinaldo Luiz; Esteves, Francisco A.; Cunha, Cátia Nunes da; Maltchik, Leonardo; Schöngart, Jochen; Schaeffer-Novelli, Yara; Agostinho, Ângelo Antônio

doi:10.1002/aqc.2386

Cited by 448 publications

(313 citation statements)

References 56 publications

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“…m -3 ). The Paraguay River drains the Pantanal region, one of the largest wetlands in the world of major ecological importance (Junk et al, 2013). The seasonal larvae diminution could be related to effects of the regional natural phenomenon known as "decoada", which is associated with the decomposition of organic matter (mostly aquatic macrophytes), after the flood period (February/March).…”

Section: Discussionmentioning

confidence: 99%

More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin

Pessotto

Nogueira

2018

Braz. J. Biol.

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The golden mussel, Limnoperna fortunei, is an Asian freshwater bivalve introduced in South America in the beginning of the 1990's, probably through ballast water releases in La Plata River estuary. It dispersed north through Paraná, Uruguay and Paraguay Rivers. The study evaluated the macroscale (18° to 34° S; 45° to 60° W) distribution of L. fortunei (larval stages) in the main rivers and reservoirs of La Plata Basin. Samplings were performed through 68 µm vertical plankton net hauls. Limnological variables were simultaneously determined. Larvae abundance correlated significantly with oxygen (positively) in summer, with temperature (positively) in winter and with total phosphorus and total nitrogen (both negatively) in winter. We expected densities to decrease towards north (latitudinal gradient) and increase in lentic conditions (reservoirs). Despite maximum density was found near the introduction point (La Plata River) similar value was also observed 2,000 km north (Paraguay River). The first hypothesis was refuted. The second hypothesis was partially accepted. Abundances were consistently higher in summer. Higher trophic conditions and fast flow seem to inhibit population growth. Food resources (chlorophyll a) locally influenced temporal variation. Limnoperna fortunei is widely distributed in La Plata basin, reaching high larval densities superior to 10,000 ind. m -3 , in all major sub-basins. The species exhibits a high intrinsic dispersal ability (free planktonic larvae), wide tolerance to environmental factors and dispersion is potentialized by natural dispersion processes (e.g. fauna displacement) and human facilitation (e.g. commercial navigation).Keywords: golden mussel, larval stage, Uruguay River, Paraguay River, Paraná River Duas décadas após a chegada de Limnoperna fortunei (Dunker 1857) na Bacia do PrataResumo O mexilhão dourado, Limnoperna fortunei, é um bivalve de água doce originário da Ásia e introduzido na América do Sul no início de 1990, provavelmente através da água de lastro liberada no estuário do rio La Plata. Dispersando-se para o norte através dos rios Paraná, Uruguai e Paraguai. Esse estudo avaliou a distribuição em macroescala (18° a 34° S; 45° a 60° W) de L. fortunei (estágios larvais) nos principais rios e reservatórios da bacia La Plata. Amostragens foram realizadas através de arrastos verticais com rede planctônica de 68 µm. Variáveis limnológicas foram simultaneamente determinadas. A abundância larval correlacionou-se significativamente com oxigênio (positivamente) no verão, com a temperatura (positivamente) no inverno e com fósforo total e nitrogênio total (ambos negativamente) no inverno. Esperávamos um decréscimo da densidade em direção ao norte (gradiente latitudinal) e aumento em condições lênticas (reservatórios). Apesar de a densidade máxima ter sido encontrada próximo do ponto de introdução (La Plata River) valores similares também foram observados 2.000 km ao norte (rio Paraguai). A primeira hipótese foi refutada. A segunda hipótese foi parcialmente aceita. Abu...

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Section: Discussionmentioning

confidence: 99%

More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin

Pessotto

Nogueira

2018

Braz. J. Biol.

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“…The conservation of these wetlands can help ensure water security of the country against negative climate change scenarious, as well as meeting national and international agreements (Convention Ramsar, Iran, 1971) to protect Brazilian wetlands [66].…”

Section: Discussionmentioning

confidence: 99%

10-Years Land Use Changes Decrease Landscape Integrity in a Brazilian Hydrographic Basin

Estevam¹,

Arieira²,

Zeilhofer³

et al. 2017

JGIS

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Changes in land use associated with the suppression of native vegetation can greatly alter the landscape configuration, affecting biodiversity and environmental services availability. This study analyzes how changes in land use affect landscape patterns of vegetation remnant over a 10 year period. We quantified spatial landscape patterns throughout a hydrographic basin for the years 2002, 2008, 2010 and 2012, using nine landscape metrics. An indicator of integrity was used to details the transformation processes occurring in the basin that could be used to monitor the impact of landscape changes and its spatial patterning. Results showed that over this decade, extension of farming activities reduced the cover of native vegetation by 4.4%, with grassy-woody savanna, wooded savanna and forested savanna impacted especially strongly. Suppression of vegetation across this period reduced the size of fragments and their connectivity. The landscape fragmentation indicator indicated that the fragmentation pattern varied spatially, with the upland areas along river headwaters, being most fragmented. Areas of floodplains vegetation, belonged to the Pantanal Wetland, although in better integrity states, are the most threatened by current pressures of land use change. An intense recovery program for headwaters and aquifer recharge areas, as well as riparian forests, is recommended to avoid the future depletion of water production. Besides, we also recommend the maintenance and recovering of the connectivity of the current remaining patches of natural vegetation corridors and elaboration of specific laws that incoporate the consolidated scientific knowladge about wetland ecosystem functioning, like the Pantanal.

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“…The southern region of Brazil is rich in wetlands (Junk et al 2014). Specifically, the northern coast of Rio Grande do Sul, Brazil (Fig.…”

Section: Study Areamentioning

confidence: 99%

Aquatic vascular plants as handicraft: a case study in southern Brazil

et al. 2017

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Th is study aimed to evaluate knowledge about and the usage and importance of aquatic vascular plants (AVPs) in the production of handicrafts by communities on the north coast of the state of Rio Grande do Sul in southern Brazil. Th e snowball technique was employed to locate people who use and have knowledge regarding the use of AVPs for handicrafts. Data were collected through semi-structured interviews and guided tours with 35 interviewees who were involved in artisanal activity at the time of the study. Th e data were analyzed using the importance value (IV) index and the consensus value for the forms of use (CMU). Th e Spearman correlation test (rs) was employed to determine the correlations of each social variable with the knowledge variables, and Mann-Whitney U tests to verify whether men and women exhibited diff erences in knowledge. Th e interviewees cited 16 AVPs that were employed in 17 types of handicrafts, among which the four main species were Schoenoplectus californicus, Typha domingensis, T. latifolia and Androtrichum giganteum. Interviewee age, residence time on site and time working with handicrafts were the main social parameters that described the level of knowledge and use of AVPs. Th ese AVPs refl ect cultural knowledge and complement family incomes.

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Brazilian wetlands: their definition, delineation, and classification for research, sustainable management, and protection

Cited by 448 publications

References 56 publications

More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin

More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin

10-Years Land Use Changes Decrease Landscape Integrity in a Brazilian Hydrographic Basin

Aquatic vascular plants as handicraft: a case study in southern Brazil

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