Direct and indirect effects of central stoneroller (<i>Campostoma anomalum</i>) on mesocosm recovery following a flood: can macroconsumers affect denitrification?

Reisinger, Alexander J.; Presuma, Dumi L.; Gido, Keith B.; Dodds, Walter K.

doi:10.1899/10-169.1

Cited by 14 publications

(13 citation statements)

References 54 publications

(69 reference statements)

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“…The results from this study support findings from other studies documenting the important role consumer nutrient recycling can play in stream ecosystems [3], [11], [33]. For example, fish excretion of the limiting nutrient N exceeded N demand in a Venezuelan stream [3].…”

Section: Discussionsupporting

confidence: 88%

Invasive Fishes Generate Biogeochemical Hotspots in a Nutrient-Limited System

Capps

Flecker

2013

PLoS ONE

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Fishes can play important functional roles in the nutrient dynamics of freshwater systems. Aggregating fishes have the potential to generate areas of increased biogeochemical activity, or hotspots, in streams and rivers. Many of the studies documenting the functional role of fishes in nutrient dynamics have focused on native fish species; however, introduced fishes may restructure nutrient storage and cycling freshwater systems as they can attain high population densities in novel environments. The purpose of this study was to examine the impact of a non-native catfish (Loricariidae: Pterygoplichthys) on nitrogen and phosphorus remineralization and estimate whether large aggregations of these fish generate measurable biogeochemical hotspots within nutrient-limited ecosystems. Loricariids formed large aggregations during daylight hours and dispersed throughout the stream during evening hours to graze benthic habitats. Excretion rates of phosphorus were twice as great during nighttime hours when fishes were actively feeding; however, there was no diel pattern in nitrogen excretion rates. Our results indicate that spatially heterogeneous aggregations of loricariids can significantly elevate dissolved nutrient concentrations via excretion relative to ambient nitrogen and phosphorus concentrations during daylight hours, creating biogeochemical hotspots and potentially altering nutrient dynamics in invaded systems.

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Section: Discussionsupporting

confidence: 88%

Invasive Fishes Generate Biogeochemical Hotspots in a Nutrient-Limited System

Capps

Flecker

2013

PLoS ONE

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“…In the Chacamax River, a non-native grazer with a high population density and biomass had profound effects on algal biomass and primary productivity that would have been difficult to estimate without separating top-down and bottom-up influences. Most likely, the nutrientmediated and consumptive effects of grazers are species and ecosystem-specific (Reisinger et al 2011;Vanni 2010) and vary through time (Moore et al 2012). The strength of these effects is determined by the trophic status and body stoichiometry of the grazer and the nutrient-limitation status of the ecosystem.…”

Section: Discussionmentioning

confidence: 99%

“…Data from recent studies have documented the important role consumer nutrient recycling can play in stream ecosystems (Benstead et al 2010;McIntyre et al 2008;Reisinger et al 2011), and stimulatory effects of excretion have been documented for aquatic species within their native ranges (e.g., Knoll et al 2009). Therefore, high densities of invaders may represent a large, and potentially ecologically important flux of remineralized nutrients in affected rivers and streams.…”

Section: Top-down and Bottom-up Effects Of Grazing Invadersmentioning

confidence: 99%

“…Recent efforts to tease apart the potentially conflicting effects of consumption and remineralization by aquatic grazers (e.g., Knoll et al 2009;McIntyre et al 2006;Reisinger et al 2011) have been focused on species within their native ranges. However, nonnative grazers can have profound effects on primary producers in freshwaters (Carlsson and Lacoursière 2005;Gido and Franssen 2007;Nummi et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Quantifying the top-down and bottom-up effects of a non-native grazer in freshwaters

2014

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Quantifying the effects of grazing and nutrient remineralization by grazers on algal biomass and productivity is important to estimate the net effects of grazing species on ecosystem structure and function. These effects may be especially important in ecosystems threatened by the invasion of non-native grazing species, as grazers can regulate the quantity of algae through both top-down (grazing) and bottom-up (remineralization) processes. In this study, we coupled mesocosm and in situ experimental manipulations to quantify the impacts of a non-native, grazing fish (Loricariidae: Pterygoplichthys) on algal biomass and primary productivity in stream ecosystems. While loricariid grazing depressed algal biomass and rates of primary production in mesocosm and in situ experiments, loricariid-mediated nutrient remineralization enhanced algal biomass and primary production in mesocosms relative to control treatments without loricariids. In sum, even when nutrient limitation was alleviated, intensive grazing by high-densities of loricariids had a negative net-effect on algal biomass and primary productivity. Examined together, our results demonstrate the need to quantify both consumptive and remineralization effects of invasive grazers in order to develop a comprehensive understanding of how non-native organisms influence ecosystem structure and function.

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“…; Reisinger et al. ), factors regulating biomass of stonerollers could have resounding ecosystem‐level influences.…”

Section: Introductionmentioning

confidence: 99%

Density dependence of herbivorous central stoneroller Campostoma anomalum in stream mesocosms

Pennock

Gido

2016

Ecology of Freshwater Fish

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Herbivorous fish can have strong effects on stream ecosystem function by consuming primary producers and excreting limiting nutrients, but it is unclear whether they are resource limited. Thus, understanding factors regulating abundance of these fish might help predict ecosystem function. We used stream mesocosms to test whether populations of central stoneroller Campostoma anomalum exhibit density dependence across a range of typical densities and resource abundance found in Great Plains streams. We predicted that incrementally increasing stocking biomass from 3·7 to 24·9 g·m−2 would reduce standing stocks of resources resulting in lower growth of stocked fish. Fish growth (over 41 days) was compared to initial stocking biomass and primary production as well as standing stocks of algae and invertebrates using regression analysis. Mean growth of individuals was negatively associated with stocking biomass (Rnormaladj2 = 0·55; P = 0·02), as predicted. Contrary to our prediction, increases in fish biomass led to increased primary productivity (Rnormaladj2 = 0·31, P = 0·07), but resulted in no relationship among algal filament lengths (Rnormaladj2 = 0·00; P = 0·34), algal biomass (Rnormaladj2 = 0·12; P = 0·19) or invertebrate biomass (Rnormaladj2 = 0·03; P = 0·30). Thus, density dependence occurred without an apparent reduction in food resources. We hypothesised that stoneroller growth was possibly limited by competition for high‐quality algae or invertebrates, or behavioural interactions causing interference competition.

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Direct and indirect effects of central stoneroller (Campostoma anomalum) on mesocosm recovery following a flood: can macroconsumers affect denitrification?

Cited by 14 publications

References 54 publications

Invasive Fishes Generate Biogeochemical Hotspots in a Nutrient-Limited System

Invasive Fishes Generate Biogeochemical Hotspots in a Nutrient-Limited System

Quantifying the top-down and bottom-up effects of a non-native grazer in freshwaters

Density dependence of herbivorous central stoneroller Campostoma anomalum in stream mesocosms

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