Passive zooplankton community in different environments of a neotropical floodplain

Fernandes, Ana Paula Capelari; Braghin, Louizi de Souza Magalhães; Nédli, Judit; Palazzo, Fabiana; Lansac‐Tôha, Fábio Amodêo; Bonecker, Cláudia Cósta

doi:10.4025/actascibiolsci.v34i4.11161

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…These dormant stages include eggs that can survive extended periods without hatching, and adult stages that enter a quiescent state and rapidly emerge when wetlands are rewetted (Bruno et al, 2001;Frisch & Threlkeld, 2005;Tronstad, Tronstad & Benke, 2005). Zooplankton communities that emerge from inundated floodplain habitats are often highly diverse and abundant and are thought to be important in supporting the persistence, productivity and diversity of zooplankton communities in river-floodplain ecosystems (Boulton & Lloyd, 1992;Havel, Eisenbacher & Black, 2000;Fernandes et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Connectivity and complexity of floodplain habitats govern zooplankton dynamics in a large temperate river system

et al. 2013

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Summary Large river–floodplain systems are characterised by seasonal flow variability. High flows lead to hydrological connection between the main channel and inundated off‐channel lakes, wetlands and floodplains, which provide essential habitats for riverine biota. We tested the following hypotheses: (i) that crustacean zooplankton are more abundant in connected lentic habitats such as riverine lakes and wetlands and have a different community composition compared with the main channel and (ii) that vegetation structure will moderate abundances of crustacean zooplankton in the lower reaches of the Waikato River, New Zealand. Zooplankton densities in main channel inflows and inundated floodplains showed clear seasonal changes, with cladoceran and copepod abundance peaks occurring in the majority of sites 2–3 weeks following the peak spring discharges (coinciding with the retreat of water from floodplains into the main channel). Mean densities of zooplankton were highest in the inflows originating from riverine lakes (10–20 ind. L−1) where rotifers were dominant. We recorded significantly higher abundances of copepods in peat bog and swamp wetland inflows (c. 5 ind. L−1) relative to the main river channel and riverine lake inflows (0.1–1 ind. L−1). Some lake inflows also had high numbers of cladocerans (5–10 ind. L−1). Inundated floodplains displayed heterogeneity in zooplankton community composition in relation to their structural complexity. Flooded forest accommodated higher numbers of copepods (c. 8 ind. L−1) and cladocerans (c. 17 ind. L−1) than flooded grassland, where zooplankton assemblages resembled those in the main river channel and were characterised by dominance of rotifers and low overall zooplankton densities (1–2 ind. L−1). Our results suggest that seasonal flow and flood pulses, which determine the degree of connectivity of the main channel with the floodplain and off‐channel habitats, govern zooplankton densities and community structure in this large temperate river. Furthermore, the structural complexity of floodplain habitats may play an important role in enhancing riverine zooplankton diversity. We postulate that the post‐flood peak of large‐bodied cladocerans and copepods might have historically played an important role in the provision of food for juvenile fish such as migrating Galaxiidae.

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Section: Introductionmentioning

confidence: 99%

Connectivity and complexity of floodplain habitats govern zooplankton dynamics in a large temperate river system

et al. 2013

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Current knowledge of South American cladoceran diapause: A brief review

Iglesias

Bonecker

Brandão

et al. 2016

Internat. Rev. Hydrobiol.

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The study of the structure and dynamics of cladoceran egg banks in South America began only 15 years ago and the amount of knowledge, in addition to being scarce, is widely spread over partially national journals, theses, and books, and thus partially unavailable. We conducted a review of the literature published for this region, focusing mainly on the methodological approaches that have been applied and describe the main findings already published. The different methodological approaches make data comparability difficult. However, a total of 77 egg morphotypes were identified in the published studies. Among the variety of methods used, we suggest to adopt as the standard procedure: 1) pre isolation of eggs from the sediments by the “Sugar Flotation Method;” 2) identification, enumeration, and sorting of egg morphotypes present in the sample; 3) individual hatching of each egg morphotype; 4) adult individual identification to the species level according to available keys; and 5) linking identified eggs to identified species’ adults. The absence of identification keys constitutes a challenge. Therefore, collaborative research with the aim of generating pictorial taxonomical support for Neotropical resting eggs are encouraged. We believe the adoption of the suggested protocol might facilitate this issue. An extremely low hatching success was reported for most studies and the factors triggering the break of dormancy in the resting eggs coming from permanent systems remain unknown. In conclusion, resting egg studies are a novel and promising field in South America, but with many challenges that need to be addressed.

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Spatial variation of ostracod (Crustacea, Ostracoda) egg banks in temporary lakes of a tropical flood plain

Rosa

Campos

Martens

et al. 2021

Mar. Freshwater Res.

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Ostracods are microcrustaceans that produce resting eggs under adverse conditions. In this study we evaluated the spatial variation of ostracod resting eggs in different regions of temporary lakes in a Brazilian flood plain. Based on the homogenisation effect of flood pulses on aquatic communities in flood plains, we hypothesised that the composition and abundance of ostracod eggs in the centre of temporary lakes would be similar to those in edge regions. Samples were collected from the centre and edge regions of five temporary lakes. Sediment was oven dried, rehydrated and hatching was monitored in germinating chambers. Twelve ostracod species hatched from the egg banks during our experiments. The abundance and species composition were similar between the two regions of the lakes. Flood events may be responsible for the homogenisation of the egg banks as a result of the connection of lakes with principal river channels. During flooding, water masses powerfully enter lakes and can redistribute sediments. This study shows that egg banks have the potential to contribute to the maintenance of local biodiversity and the resilience of biodiversity of temporary lake ecosystems.

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Passive zooplankton community in different environments of a neotropical floodplain

Cited by 4 publications

References 21 publications

Connectivity and complexity of floodplain habitats govern zooplankton dynamics in a large temperate river system

Connectivity and complexity of floodplain habitats govern zooplankton dynamics in a large temperate river system

Current knowledge of South American cladoceran diapause: A brief review

Spatial variation of ostracod (Crustacea, Ostracoda) egg banks in temporary lakes of a tropical flood plain

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