Do human activities affect phytoplankton biomass and composition in embayments on Lake Diefenbaker?

Abirhire, Oghenemise; North, Rebecca L.; Hunter, Kristine; Vandergucht, David M.; Hudson, Jeff J.

doi:10.1080/02705060.2016.1205526

Cited by 13 publications

(7 citation statements)

References 56 publications

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“…Unfortunately, human and land-use activities have exploited this resource heavily, and as a result, freshwater ecosystems are under threat (Cabecinha et al 2016). Besides the impact of anthropogenic stressors, climate change has also been shown to threaten freshwater biodiversity and aquatic ecosystem health (Hayes et al 2015;Abirhire et al 2016;Xizhi et al 2017;Reid et al 2019). Results presented during this study have shown that both land-use and hydrological flow, can influence nutrient concentrations and abundance and dynamics of phytoplankton assemblages in the Sabie River.…”

Section: Discussionmentioning

confidence: 62%

“…Climate and land-use are two emerging factors (since 2006) that impact on and threaten freshwater biodiversity and aquatic ecosystem health (Hayes et al 2015;Abirhire et al 2016;Xizhi et al 2017;Reid et al 2019). Many studies have shown that land-use changes and pressure can significantly affect the water quality of rivers, lakes and reservoirs (Kändler et al 2017;Vrebos et al 2017;Shi et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The effect of climate is more difficult to quantify since precipitation and temperature affect the flow of water, whilst nutrient loading is known to alter phytoplankton assemblage, diversity and biomass (Michalak 2016;Bussi et al 2016). Poor water quality and higher temperatures are often associated with high cyanobacterial biomass (Abirhire et al 2016;Bussi et al 2016), while the Chrysophyceae, Dinophyceae and Bacillariophyceae are often associated with lower nutrient levels (Katsiapi et al 2012). The biodiversity and biomass of the Chrysophyceae are known to decrease as the Cyanophyceae cell concentrations increase (Katsiapi et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Impact of land-use and flow conditions on the phytoplankton of the Sabie River, South Africa

et al. 2021

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Background: The understanding of the impact of land-use on the dynamics of phytoplankton assemblages during varying climate conditions on rivers is limited.Objective: To determine the impact of land-use types and flow on phytoplankton assemblages in the Sabie River.Methods: The relationships between land-use patterns, water quality and phytoplankton assemblages were analysed using canonical correspondence analyses (CCA).Results: Six main land-use types could be distinguished in the eight identified sub-catchments of the river. The CCA results showed that the land-use had a stronger correlation with phytoplankton classes during the higher flow conditions than during low flow conditions. The forestry land-use type had the strongest correlation with nitrate–nitrite concentrations in the Sabie River. Chlorophyll-a concentrations were higher during 2016, and a slightly lower number of genera were observed for the class Chlorophyceae. During 2017 the number of genera of the class Cyanophyceae decreased together with chlorophyll-a and total cell concentrations.Conclusion: Low flow conditions favoured filamentous genera that are common to mesotrophic conditions while higher flow conditions favoured single-celled small genera more common to oligotrophic waters with higher disturbance. This study showed that flow has the potential to enhance the impact of land-use on phytoplankton community dynamics in a river system and thereby may have further impacts on the health and activities of surrounding communities.

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Section: Discussionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of land-use and flow conditions on the phytoplankton of the Sabie River, South Africa

et al. 2021

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“…Coastal embayments and river-mouth ecosystems are economically and ecologically important regions (Braden et al, 2008;Reichert et al, 2010) that provide numerous ecosystem services (Larson et al, 2013;Sebastiá & Rodilla, 2013;Larson, Frost, Vallazza, Nelson, & Richardson, 2016), and may be early warning systems for the larger lake system and lakes in general (Abirhire, North, Hunter, Vandergucht, & Hudson, 2016;Spatharis, Tsirtsis, Danielidis, Chi, & Mouillot, 2007). Coastal embayments are also vulnerable to excessive nutrient loading and eutrophication because they are often sheltered regions with longer residence times (Hall et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…With eutrophication, otherwise diverse phytoplankton communities can become dominated by a limited number of species (Downing, Watson, & McCauley, 2001;Orihel et al, 2015;Perri, Sullivan, & Boyer, 2015), including toxic or harmful species that may form harmful algal blooms (Conley et al, 2009). Knowledge of how riverine inputs influence coastal embayments and potentially give rise to conditions different from either upstream or open lake environments is still developing (Abirhire et al, 2016;Larson et al, 2013;Weinke et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Riverine transport and nutrient inputs affect phytoplankton communities in a coastal embayment

et al. 2019

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1. Rivers often transport phytoplankton to coastal embayments and introduce nutrients that can enrich coastal plankton communities. We investigated the effects of the Nottawasaga River on the nearshore (i.e. within 500 μm of shore) phytoplankton composition along a 10-km transect of Nottawasaga Bay, Lake Huron in 2015 and 2016. Imaging flow cytometry was used to identify and enumerate algal taxa, which were resolved at sizes larger than small nanoplankton (i.e. >5 μm).Multivariate analysis (perMANOVA and redundancy analysis) and a dilution model were used to examine how nutrients and the transport of algal taxa affected community composition in the bay.2. Sampling stations with different percentages of river water had significantly different phytoplankton communities. Phytoplankton community composition was also strongly associated with nutrients, including total phosphorus, which also varied with the percentage of river water. The majority of the 51 phytoplankton taxa identified in 2016 had numerical abundances in the bay that could be explained simply by the dilution of incoming river water.3. Phytoplankton transported from the river had a higher proportion of edible-sized cells (<30 μm), particularly in summer when colonial cyanobacteria were numerically dominant in the bay. Six taxa were more abundant than expected from the dilution of river water and included some cyanobacteria with late summer maxima.Five of the taxa that were transported from the river were less abundant than expected in the bay.4. Whereas impacts of fertilisation due to the characteristically higher nutrient concentration in the river are to be expected, the strong and highly correlated effects of transport within the narrow coastal band of this study largely concealed any distinct fertilisation effects. 5. Riverine inputs may strongly influence the nearshore assemblage of phytoplankton in oligotrophic embayments in large lakes, creating hotspots for productivity, species turnover, and trophic dynamics. K E Y W O R D Salgae, cyanobacteria, dilution model, fertilisation, trophic dynamics S U PP O RTI N G I N FO R M ATI O NAdditional supporting information may be found online in the Supporting Information section.

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Phosphorus release from sediments in a river-valley reservoir in the northern Great Plains of North America

et al. 2016

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Do human activities affect phytoplankton biomass and composition in embayments on Lake Diefenbaker?

Cited by 13 publications

References 56 publications

Impact of land-use and flow conditions on the phytoplankton of the Sabie River, South Africa

Impact of land-use and flow conditions on the phytoplankton of the Sabie River, South Africa

Riverine transport and nutrient inputs affect phytoplankton communities in a coastal embayment

Phosphorus release from sediments in a river-valley reservoir in the northern Great Plains of North America

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