Spatial variability of aquatic plant and microfaunal seed and egg bank communities within a forested floodplain system of a temperate Australian river

Portinho, Jorge Laço; Nielsen, Daryl L.; Ning, Nathan; Paul, Warren; Nogueira, Marcos Gomes

doi:10.1007/s00027-016-0514-z

Cited by 5 publications

(3 citation statements)

References 68 publications

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“…In relation to the drivers of alpha and beta diversity, substrate heterogeneity significantly accounted for alpha diversity. Earlier studies described significant variation in the hatchling community associated with fine‐scale differences in the sediment conditions within a given waterbody (Nielsen, Jasper, Ning, & Lawler, 2015; Portinho, Nielsen, Ning, Paul, & Nogueira, 2017; Santangelo, de Esteves, Manca, & Bozelli, 2011). This pattern could likely reflect a differential deposition of the egg bank within each pond (Gyllström & Hansson, 2004).…”

Section: Discussionmentioning

confidence: 99%

Ecological correlates of the alpha and beta diversity of zooplankton hatchling communities in seasonal subtropical ponds

Freiry

Pires

Gouvea

et al. 2021

Ecological Research

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Most zooplankton species inhabiting seasonal ponds produce dormant stages to overcome the dry seasons. Zooplankton specimens emerging from the sediment contribute to the ecological dynamics of these ecosystems, because they constitute important energy sources for higher trophic levels in aquatic food webs. In contrast to snapshot studies of the active communities, studying the ecological correlates of the distribution of the egg bank can help identify the potential drivers of zooplankton composition. We tested the association of local (habitat structure and water chemistry), climatic and spatial predictors with the alpha and beta diversity of zooplankton hatchling communities in subtropical seasonal ponds. Incubation experiments were conducted with sediment samples from 11 ponds distributed along an approximately 500‐km latitudinal gradient in southern Brazil. We assessed the patterns for the total community, Cladocera only and Rotifera only. The alpha diversity of the total community and Cladocera were primarily related to substrate heterogeneity. Annual rainfall and substrate heterogeneity jointly influenced the beta diversity of the total community. Annual rainfall solely influenced the beta diversity of Cladocera, while substrate heterogeneity influenced the overall beta diversity of Rotifera. Overall, the distinct relationships of the total hatchling community and Cladocera and Rotifera with the explanatory datasets suggest differing sensitivities of the zooplankton groups to impacts in habitat structure and climatic conditions in subtropical seasonal ponds.

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Section: Discussionmentioning

confidence: 99%

Ecological correlates of the alpha and beta diversity of zooplankton hatchling communities in seasonal subtropical ponds

Freiry

Pires

Gouvea

et al. 2021

Ecological Research

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“…A detailed limnological and biota description of the four lakes can be found in Granado and Henry (2008) and Panarelli et al (2008). From each lake, sediment samples were collected on 31st January 2017 from seven equidistant sampling stations along a transect from lake shore (shallow area), stopping at pelagic zone (deep area) to sample the spatial heterogeneity of dormant eggs within the lakes (Portinho et al, 2016). At each sampling station, surface sediment samples (<10 cm depth) were collected by Van Veen grab (0.06 m 2 ) and placed in a plastic bag following the methods of Nielsen et al (2003Nielsen et al ( , 2007.…”

Section: Field Sites and Sediment Collection Containing Dormant Zooplmentioning

confidence: 99%

Mixture of commercial herbicides based on 2,4-D and glyphosate mixture can suppress the emergence of zooplankton from sediments

et al. 2018

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It is generally assumed that zooplankton can recolonize lakes that have been exposed to pesticides, via their dormant egg banks. Hitherto, few studies have evaluated the relative importance of dormant egg bank recruitment in the re-establishment of zooplankton communities in the presence of pesticide. This study investigated the effects of commercial products Bratt (a.i. 2,4-D), Roundup (a.i. glyphosate) and their mixture on the emergence (abundance and taxon richness) of dormant zooplankton egg banks from natural lake sediment. Sediment samples were collected from the surface sediment (<10 cm depth) in four lakes in Southeast São Paulo, Brazil. We performed a hatching experiment, in which natural lake sediments containing dormant eggs were exposed separately to Bratt (applied concentrations ranging from 0.30 to 20 mg L), Roundup (0.28-8.5 mg L), and combined mixtures of all concentrations, plus one control (non-exposure to formulated herbicides) for a period of 28 days. All tested concentrations of Bratt, Roundup and their mixture reduced the abundance and taxon richness of emerging zooplankton (except 2 mg L of Bratt). This effect was more pronounced in rotifers. In comparison, there were no negative effects on the emergence of microcrustaceans. These findings suggest that commercial products Bratt, Roundup and their mixture can suppress the emergence of rotifers, thereby influencing zooplankton recruitment potential in lakes impacted by the presence of these commercial herbicides. Our results stress the importance of the need for additional studies to assess the effects of pesticides on dormant egg banks.

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“…Although it is widely accepted that flood history is a driver of egg bank composition and hatching patterns (Cáceres & Tessier, 2003; Paidere, 2009; Portinho et al., 2017; Shiel et al., 1998; Vanoverbeke & De Meester, 2015), several important knowledge gaps remain with respect to the relative importance of these mechanisms and how they manifest as distinct spatial patterns in relation to flood history. For example, it has been demonstrated that sediments that have been flooded within the past 1–7 years tend to yield more abundant and diverse microcrustacean assemblages than sediments that have not been flooded for a decade or more (Boulton & Lloyd, 1992; Jenkins & Boulton, 2007; Nielsen et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

The influence of flood frequency and duration on microcrustacean egg bank composition in dryland river floodplain sediments

2021

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Several studies of temporary floodplain wetlands suggest that flood history is important to microcrustacean egg bank composition and hatching responses. However, these studies have largely focussed on contrasts among less frequently flooded areas (areas flooded every year to areas flooded once every 10–20 years) and less is known about variation at the more frequently flooded end of the gradient (from multiple floods per year to once every 2 years). Similarly, the effects of flood duration on egg banks have not been examined in detail. Thus, this study examines spatial variation in microcrustacean hatching at higher flood frequencies and in relation to inundation duration. Surface sediment samples were collected from dry anabranches of the Macintyre River floodplain in Australia during February 2018, with a range of flood frequency from approximately four times per year to one in 2 years. Anabranches were selected randomly from predefined flood frequency classes and clustered into three different flood history groups based on flood history variables. Soil samples were collected from deep and shallow locations within anabranches, with depth assumed to be a proxy for the duration of inundation. Sediment samples were inundated in mesocosms and hatched microcrustaceans sampled over 6 weeks. Microcrustacean abundance and assemblage composition varied by sites, relative depth, and duration of inundation. There was no variation by flood history groups. Highest numbers hatched from the deeper areas of anabranches, which is assumed to reflect differences in the egg banks of deep and shallow areas due to the longer duration of inundation in deeper areas. Duration also influenced hatching response from the egg bank, with more microcrustaceans hatching per unit time in the first 2 and final 2 weeks of the 6‐week trial than the middle 2 weeks. Species richness also varied by relative depth and duration of inundation with more taxa hatching from the deeper areas of anabranches. The study highlights the critical influence of flood duration on hatching patterns of microcrustaceans from inundated sediments. Therefore, changes to flood duration have the potential to influence microcrustacean assemblages and thus further changes to trophic interactions in temporary floodplain wetlands.

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Spatial variability of aquatic plant and microfaunal seed and egg bank communities within a forested floodplain system of a temperate Australian river

Cited by 5 publications

References 68 publications

Ecological correlates of the alpha and beta diversity of zooplankton hatchling communities in seasonal subtropical ponds

Ecological correlates of the alpha and beta diversity of zooplankton hatchling communities in seasonal subtropical ponds

Mixture of commercial herbicides based on 2,4-D and glyphosate mixture can suppress the emergence of zooplankton from sediments

The influence of flood frequency and duration on microcrustacean egg bank composition in dryland river floodplain sediments

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