scholarly journals Flood‐pulse disturbances as a threat for long‐living Amazonian trees

2020 ◽  
Vol 227 (6) ◽  
pp. 1790-1803 ◽  
Author(s):  
Angélica F. Resende ◽  
Maria T. F. Piedade ◽  
Yuri O. Feitosa ◽  
Victor Hugo F. Andrade ◽  
Susan E. Trumbore ◽  
...  
Keyword(s):  
Flood Pulse ◽  
Amazonian Trees

Multidecadal variability of the Tonle Sap Lake flood pulse regime

2021 ◽  
Author(s):  
Aifang Chen ◽  
Junguo Liu ◽  
Matti Kummu ◽  
Olli Varis ◽  
Qiuhong Tang ◽  
...  
Keyword(s):  
Flood Pulse ◽  
Pulse Regime ◽  
Multidecadal Variability ◽  
Tonle Sap Lake ◽  
Tonle Sap

The effect of a flood pulse on the water column of western Lake Superior, USA

2014 ◽  
Vol 40 (2) ◽  
pp. 455-462 ◽  
Author(s):  
Elizabeth C. Minor ◽  
Brandy Forsman ◽  
Stephanie J. Guildford
Keyword(s):  
Water Column ◽  
Lake Superior ◽  
Flood Pulse ◽  
Western Lake

Disaggregating Hydroperiod: Components of the Seasonal Flood Pulse as Drivers of Plant Species Distribution in Floodplains of a Tropical Wetland

Wetlands ◽  
2014 ◽  
Vol 34 (5) ◽  
pp. 927-942 ◽  
Author(s):  
Michael Murray-Hudson ◽  
Piotr Wolski ◽  
Frances Murray-Hudson ◽  
Mark T. Brown ◽  
Keotshephile Kashe
Keyword(s):  
Plant Species ◽  
Species Distribution ◽  
Flood Pulse ◽  
Seasonal Flood

Decreasing Richness And Biomass During A Flood Pulse Observed In A Southeastern US Coastal Floodplain Following A Multi-Year, Supra-Seasonal Drought

2021 ◽  
Author(s):  
Erica L. Johnson ◽  
Erin F. Abernethy ◽  
J. Checo Colón-Gaud
Keyword(s):  
Community Composition ◽  
Climate Change Impacts ◽  
Flood Pulse ◽  
Macroinvertebrate Communities ◽  
Biological Productivity ◽  
Aquatic Communities ◽  
Functional Feeding Group ◽  
Seasonal Flooding ◽  
Southeastern Us ◽  
Feeding Group

Abstract Floodplains of the southeastern United States exhibit high biological productivity, maintained by periodic floodplain inundation as a result of seasonal flooding. To examine the relationship between biological productivity and seasonal flooding following periods of drought, we quantified aquatic macroinvertebrate communities monthly in an inundated floodplain during the annual flood pulse (December-April) in two years, one following a multi-year drought and one following a larger than average flooding event. We predicted that floodplain communities would differ in richness, biomass, and community composition between years and that differences would be driven by discharge at the main stem and organic matter availability. We collected macroinvertebrates from the floodplain of the Altamaha River, an unimpounded 6th order river in the Coastal Plain region of the southeastern US that experiences floodplain connectivity. With invertebrates identified to genus, we elucidated richness, abundance, biomass, community composition, and functional feeding group. Richness was generally higher in the drought year but decreased throughout the flood pulse, while during the flood year richness was lower and increased. Biomass decreased throughout the flood pulse following the drought year and increased during the flood year. There was a high degree of overlap in invertebrate community composition based on abundance data during both years of the study with collector gatherers being the most highly abundant functional feeding group. As climate change impacts (i.e., severe droughts) become more common, it is critical to investigate how aquatic communities are responding to increasingly unpredictable flow conditions in unimpounded and seemingly unaltered rivers.

scholarly journals The effect of seasonality on the structure of rotifers in a black-water shallow lake in Central Amazonia

2014 ◽  
Vol 86 (3) ◽  
pp. 1359-1372 ◽  
Author(s):  
CLARICE C. NOVA ◽  
VANESSA G. LOPES ◽  
LEONARDO COIMBRA E SOUZA ◽  
BETINA KOZLOWSKY-SUZUKI ◽  
TALITA A.A. PEREIRA ◽  
...  
Keyword(s):  
Species Composition ◽  
Driving Force ◽  
Community Dynamics ◽  
Flood Pulse ◽  
Small Lakes ◽  
Black Water ◽  
Negro River ◽  
Rotifer Community ◽  
Central Amazonia ◽  
Physical And Chemical

Rotifers have often been used as indicators of sudden changes in physical and chemical features of the aquatic environment. Such features vary greatly during flood pulse events in small lakes connected to major floodplains. However, few are the studies that investigate the consequences of the flood pulse in rotifer species composition, abundance, richness and diversity, especially in Amazonian lakes. We analyzed samples from a small blackwater lake of an “igarapé” connected permanently to the Negro river, in Central Amazonia. Samples were taken twice a year for two years, comprising flooding and receding periods of the flood pulse. Rotifer abundance increased significantly after draught events, and electrical conductivity and turbidity were intrinsically related to such variation. Species composition also changed from flooding to receding periods. Some taxa, such as Brachionus zahniseri reductus and Lecane remanei were restricted to receding periods, while Brachionus zahniseri, Brachionus gillardi and Lecane proiecta were only present during flooding. A shift in the composition of rotifer families was observed from one period to another, showing the effect of renewing waters of the flood pulse. These results suggest that the flood pulse acts as a driving force and stressing condition, considerably altering rotifer community dynamics, either changing species composition or decreasing abundance.

scholarly journals Variations on the larval incubation of Anodontites trapesialis (Unionoida, Mycetopodidae): Synergetic effect of the environmental factors and host availability

2012 ◽  
Vol 72 (3) ◽  
pp. 545-552 ◽  
Author(s):  
CT. Callil ◽  
D. Krinski ◽  
FA. Silva
Keyword(s):  
Environmental Factors ◽  
Temporal Variation ◽  
Environmental Variables ◽  
Freshwater Mussels ◽  
Synergetic Effect ◽  
Flood Pulse ◽  
Host Availability

The unionid Anodontites trapesilais (Lamarck, 1819) like most freshwater mussels is a parasite of fish. So it is trivial to assume that the availability of hosts is an important factor for the maintenance of unionoid populations. What seems obvious is not always so easy to demonstrate. This study proposes to investigate the effects of abiotic and biotic variables related to the incubation of larvae in A. trapesialis. For this, we estimate different biological indexes and try to capture the dimensionality of the fish, along with the temporal variation of environmental variables. From the application of a CCA, it was demonstrated that there was a synchronicity among the factors and variables proposed here, and we infer that the flood pulse acts as a synergistic factor in this process.

scholarly journals Mollusc fisheries and length–weight relationship in Tonle Sap flood pulse system, Cambodia

2018 ◽  
Vol 54 ◽  
pp. 34 ◽  
Author(s):  
Peng Bun Ngor ◽  
Ratha Sor ◽  
Leang Hour Prak ◽  
Nam So ◽  
Zeb S. Hogan ◽  
...  
Keyword(s):  
Annual Variation ◽  
Flood Pulse ◽  
Growth Patterns ◽  
Water Levels ◽  
Relationship Analysis ◽  
Weight Relationship ◽  
Daily Data ◽  
Tonle Sap ◽  
Mollusc Species ◽  
One Year

Molluscs are important for ecological function, livelihoods and fisheries, but are often forgotten in research and management. Here, we investigated intra-annual variation in the landing and growth patterns of three mollusc species, i.e., Corbicula moreletiana, Pila virescens and Pila ampullacea, using one-year daily data on landing catches and values, recorded in Kampong Chhnang province of Tonle Sap (TS) Lake. Overall, 8330 tonnes with a first sale landing value of US$ 1.4 million for the three species were reported. Also, we found that C. moreletiana was abundant during the dry season with high temperature and less precipitation. By contrast, the two Pila species were abundant from the early rainy to early dry seasons when precipitation and water levels increase. The length–weight relationship analysis indicated that a faster growth in weight of Pila species occurred in the rainy season, and a general negative allometric growth was observed for the three species. This implies that their populations were intensively fished. Our preliminary results suggest that molluscs in the TS Lake (i) are important resources in support of people's livelihoods, (ii) respond differently to intra-annual variation in temperature, precipitation and hydrology and (iii) are being intensively exploited with significant reduction in growth rate. Therefore, it is necessary to conduct further comprehensive research describing status of mollusc stocks and their ecology to support long-term management and conservation of this important aquatic fauna. Our study contributes to establishing the first important baseline data and information on key mollusc species for the TS.

scholarly journals Feeding ecology of Serrasalmus gouldingi (Characiformes: Serrasalmidae) in the lower Anapu River region, Eastern Amazon, Brazil

2016 ◽  
Vol 46 (3) ◽  
pp. 259-270 ◽  
Author(s):  
Bruno da S. PRUDENTE ◽  
Pedro CARNEIRO-MARINHO ◽  
Roberta de M. VALENTE ◽  
Luciano F. de A. MONTAG
Keyword(s):  
Feeding Ecology ◽  
Diet Composition ◽  
Niche Breadth ◽  
Life Stage ◽  
Flood Pulse ◽  
Feeding Intensity ◽  
High Tendency ◽  
Flood Season ◽  
River Region ◽  
The Relationship

Abstract Studies on feeding ecology of fishes are important to understand the relationship between species and environmental seasonal variations. In tropical rivers, these relationships are mainly modeled by hydrological patterns. Thereby, this study aimed to assess the influence of fluviometric variation and life stage (juveniles and adults) in the feeding ecology of Serrasalmus gouldingi in the lower Anapu River region, located in Eastern Amazon, Pará, Brazil. Specimens were collected bimonthly, considering four different hydrological periods. We assessed the diet composition, feeding intensity and niche breadth of the species. Thirty-two dietary items were identified and grouped into ten categories. A total of 279 stomachs were analyzed, showing a predominance of fish fragments, followed by fruits and seeds. The diet composition of S. gouldingi differed only between drought and flood season, although it did not differ between juveniles and adults. An increase in feeding intensity was recorded during the rise in the water level, with a lower feeding intensity observed during transitional season. Serrasalmus gouldingi showed lower niche breadth during flood season, attributed to the high consumption of fruits and seeds, presenting an omnivorous diet with high tendency towards piscivory. Although less evident than in other Amazon watersheds, the flood pulse in the lower Anapu River region is an important factor influencing the feeding ecology of the species.

scholarly journals Capões como Ilhas para Artrópodes no Pantanal

2013 ◽  
Vol 6 (3) ◽  
pp. 173-177 ◽  
Author(s):  
Rodrigo Aranda
Keyword(s):  
Leaf Litter ◽  
Community Composition ◽  
Riparian Vegetation ◽  
Flood Pulse ◽  
Soil Arthropods ◽  
Arthropod Community ◽  
Plastic Bags

A configuração do habitat é um dos fatores que pode influenciar a distribuição dos organismos. O pantanal por apresentar mosaico natural de formações se enquadra para testar tais afirmações. O presente estudo teve como objetivo avaliar se a distância e o tamanho de capões afetam a composição da comunidade de artrópodes testando a hipótese de que quanto maior e mais próximo o capão da mata ciliar, maior sua diversidade. Foram amostradas seis parcelas de 30 cm² em nove capões onde a serrapilheira e o solo foram coletados, acondicionados em sacos plásticos e posteriormente triados. Houve relação entre a composição da comunidade de artrópodes em relação à distância e o tamanho indicando que o pulso de inundação do último ano afetou de forma significativa a comunidade de artrópodes de solo em capões. O acompanhamento dos processos de recolonização dos capões é sugerido. Capons as Island for Arthropods in Pantanal Abstract. The configuration of habitat is one of the factors that influence the distribution of organisms. The Pantanal by presenting mosaic natural formations fit to test such claims. The present study aimed to evaluate the distance and size of riparian capons affect the community composition of arthropods tested the hypothesis that the higher and closer to the capon of riparian vegetation, the greater its diversity. We sampled six plots of 30 cm² in nine capons where the leaf-litter and soil were collected, placed in plastic bags and later sorted. There was a relationship between the composition of arthropod community in relation to distance and size indicating that the flood pulse of the last year significantly affected the community of soil arthropods in geldings. The monitoring of the processes of recolonization of the capons is suggested.

scholarly journals Effects of flood pulse on the community of Loricariidae (Pisces, Siluriformes) in oxbow lakes of the Pantanal, Brazil

2018 ◽  
Vol 44 (1) ◽  
pp. 35-43
Author(s):  
Gustavo Figueiredo Marques LEITE ◽  
Renan de Souza REZENDE ◽  
Hugmar PAINS DA SILVA ◽  
Claumir Cesar MUNIZ
Keyword(s):  
Flood Pulse ◽  
Oxbow Lakes
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