Improvements in water quality following biomanipulation of gizzard shad (<i>Dorosoma cepedianum</i>) in Lake Denham, Florida

Godwin, Walt; Coveney, Michael; Lowe, Edgar F.; Battoe, Lawrence E.

doi:10.1080/07438141.2011.609633

Cited by 10 publications

(8 citation statements)

References 33 publications

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“…This has been previously reported for other benthivorous fish species such as bream (Abramis brama), common carp (Cyprinus carpio) and gizzard shad (Dorosoma cepedianum), which are common in temperate eutrophic shallow lakes (Andersson et al, 1978;Meijer et al, 1990;Breukelaar et al, 1994;Lougheed et al, 1998;Schaus & Vanni, 2000;Godwin et al, 2011;Volta et al, 2013). It has been suggested that a reduction of 70-85% of benthivorous fish biomass (Meijer et al, 1990;Hosper & Meijer, 1993;Perrow et al, 1997;Hansson et al, 1998) and the maintenance of their population depressed (Godwin et al, 2011) is necessary for a long-term improvement of lake water quality by biomanipulation. In our study, we compared two contrasting levels of benthivorous fish (presence/ absence) because these were the most relevant levels to test our hypothesis.…”

Section: Discussionmentioning

confidence: 86%

Shallow lake restoration and water quality management by the combined effects of polyaluminium chloride addition and benthivorous fish removal: a field mesocosm experiment

2015

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Polyaluminium chloride (PAC) has been used in lake restoration and water quality management as a flocculent to remove algal biomass and organic matter from the water column and increase water transparency. However, benthivorous fish may suspend the sedimented flocs and reduce the efficiency of PAC in improving water quality. Therefore, we hypothesized that PAC is more efficient in reducing algal biomass, suspended solids and total phosphorus concentrations in the water, and increasing water transparency, when benthivorous fish is removed. To test this hypothesis, we performed a field experiment combining the presence and absence of PAC (2 mg Al l -1 ) with the presence and absence of benthivorous fish (350 g m -2 ). Contrary to our hypothesis, no significant interactions were found between the effects of PAC addition and benthivorous fish removal on the measured variables. Both techniques significantly decreased chlorophyll a and phosphorus concentrations and increased water transparency, but their effects were independent of each other. The above results suggest that either of the treatments may improve water quality, but this goal would be better achieved by the combination of both techniques than by the application of one or other technique in isolation.

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Section: Discussionmentioning

confidence: 86%

Shallow lake restoration and water quality management by the combined effects of polyaluminium chloride addition and benthivorous fish removal: a field mesocosm experiment

2015

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“…However, the SJRWMD removals have repeatedly harvested fish over several years in succession, lowering reproduction by larger size classes, and fish harvest remains the cheapest means to remove P from these lakes (SJRWMD, unpublished data). The annual removals reported here ranged from 19.1-121.6 kg·ha −1 ·yr −1 (Table V), and the annual removals from Lake Denham (104 ha, 1.4 m mean depth) were 380 kg·ha −1 ·yr −1 during 1990, 88 kg·ha −1 ·yr −1 during 1991, and 30 kg·ha −1 ·yr −1 during 1992 (Godwin et al, 2011). In Lake Apopka, a multipronged management effort has sought to cut external P loading, remove gizzard shad, and remove particulate P via wetland filtration (Coveney et al, 2002Schaus et al, 2010).…”

Section: Discussionmentioning

confidence: 76%

“…The Lake Denham removal (1990-1992) used haul seines (mesh 8.75-10 cm stretched mesh) to remove well over 90% of the harvestable (>200 mm TL) gizzard shad biomass (Godwin et al, 2011). The 1992 sampling was suspended after only 8 seine hauls, because there were so few fish harvested.…”

Section: Discussionmentioning

confidence: 99%

“…The gizzard shad biomass in experimental gill nets remained lower after the cessation of harvest, and water quality parameters (chl a, TP, Secchi depth, TSS, etc.) showed improvements that persisted for at least 3-8 years (Godwin et al, 2011). The Lake Dora fish removal (2005)(2006) was conducted to examine the potential density-dependent effects on growth, survival and fecundity following gizzard shad removal.…”

Section: Discussionmentioning

confidence: 99%

“…The Lake Apopka harvest included both seasonal (Jan.-May) harvests where commercial fishers were paid a subsidy by SJRWMD as an incentive to increase the harvest, as well as a smaller year-round unsubsidized harvest. The SJRWMD also has conducted experimental harvests in Lakes Denham (1990Denham ( -1992Godwin et al, 2011) and Dora (2005Dora ( -2006Catalano and Allen, 2011a), so the nutrient effects of fish harvests can be compared among lakes and years. Our previous work estimated nutrient effects of harvest in Lake Apopka during 1993-2005 using direct excretion measurements of N and P and scaling these up to Coveney et al (2005) and Fulton (1995) the entire harvest based only on the mean mass of gizzard shad collected that was vulnerable to gill nets, and not the specific size structure of the fish removed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of a size-selective biomanipulation on nutrient release by gizzard shad in Florida (USA) lakes

Schaus

Godwin

Battoe

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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Key-words: Dorosoma cepedianum, biomanipulation, size-structure, nutrient excretionAlthough fish removal for biomanipulation is often highly size-selective, our understanding of the nutrient cycling effects of this size-selection is poor. To better understand these effects, we measured nutrient excretion by gizzard shad (Dorosoma cepedianum) of differing sizes from four central Florida (USA) lakes and combined these measures with gillnet biomass and size-structure data to compare lake-wide effects among lakes and years. Direct removal of P in fish tissue ranged from 0.16−1.00 kg·P·ha −1 ·yr −1 . The estimated reduction in P excretion due to harvest ranged from 30.8−202.5 g·P·ha −1 ·month −1 , with effects strongly tied to the biomass and size structure harvested. The amount of P release prevented per kg of fish removed was lower in previously unharvested lakes, due to the initial removal of larger fish with lower mass-specific excretion rates. Gill net mesh size impacted the size distribution of harvested fish, with smaller fish that excrete more P per gram being more vulnerable to smaller mesh sizes. In Lake Apopka, decreasing the mesh size by 1.3 cm yielded P excretion reductions that were 10.7−15.1% larger. Fish harvesting to reduce internal nutrient cycling can be most effective by increasing total harvest and by harvesting smaller size classes over multiple years. RÉSUMÉEffet d'une biomanipulation sélective en taille sur la libération des éléments nutritifs par l'alose noyer dans des lacs de Floride (États-Unis) Mots-clés : éléments nutritifsBien que l'enlèvement des poissons pour biomanipulation soit souvent très calibré, notre compréhension des effets sur le cycle des éléments nutritifs de cette sélection en taille est peu documentée. Pour mieux comprendre ces effets, nous avons mesuré l'excrétion des nutriments par l'alose noyer (Dorosoma cepedianum) de différentes tailles à partir de quatre lacs de Floride centrale (États-Unis) et combiné ces mesures avec la biomasse estimée aux filets maillants et les données de structure en taille pour comparer les effets à l'échelle du lac suivant les lacs et les années. Le retrait direct de P dans les tissus des poissons variait de 0,16 à 1,00 kg·P·ha −1 ·année −1 . La réduction de P estimée par excrétion due à la récolte variait de 30,8 à 202,5 g·P·ha −1 ·mois −1 , avec des effets fortement liés à la biomasse et la structure en taille du retrait. La quantité de P libérée évitée par kg de poisson prélevé était plus faible dans les lacs précédemment non pêchés, en raison de la suppression initiale de gros poissons avec des taux d'excrétion de masse volumique inférieure. Le maillage des filets a impacté la distribution en taille des poissons pêchés, les petits poissons qui excrètent plus de P par gramme étant plus vulnérables à des petits maillages. Dans le lac Apopka, la diminution de la taille des mailles de 1,3 cm a permis de réduire l'excrétion de P de 10,7 à 15,1 % en plus. Le retrait de poissons afin de réduire le cycle nutritif interne peut être plus e...

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Increased light availability and nutrient cycling by fish provide resilience against reversing eutrophication in an agriculturally impacted reservoir

Kelly

González

Renwick

et al. 2018

Limnology & Oceanography

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High external nutrient loads to lakes are a primary cause of eutrophication. As such, management activities in the watersheds of heavily impacted systems are commonly implemented to reduce nutrient supply to lakes with high phytoplankton biomass. Although management efforts are often successful, resilience against the reversal of eutrophication may be maintained by a variety of different drivers of phytoplankton biomass. These may include internal sources of nutrients, and increases in light availability with declining sediment loads. We used a 21‐yr dataset to examine the responses of Acton Lake, a eutrophic agriculturally impacted reservoir, to determine the relative strength of potential drivers of changes in phytoplankton biomass through time. We also identified sources of ecosystem resilience that allow the lake to remain eutrophic. Despite declining nutrient concentrations in inflow streams, chlorophyll increased in Acton Lake over approximately the first decade of our study, and remained relatively stable in the second decade. Time series modeling suggests two primary drivers of increased phytoplankton: (1) increased nutrient excretion by detritivorous fish (gizzard shad, Dorosoma cepedianum), and (2) declining sediment loads from the watershed that reduced phytoplankton light limitation. We also identify precipitation patterns and stream discharge as being possible sources of ecosystem resilience, contributing to high loads of nutrients even if concentrations in inflow streams have declined with better management. These results suggest a more comprehensive view of management efforts to reduce eutrophication may be necessary, incorporating interactions among internal nutrient sources, climate variation, and changes in light availability.

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Improvements in water quality following biomanipulation of gizzard shad (Dorosoma cepedianum) in Lake Denham, Florida

Cited by 10 publications

References 33 publications

Shallow lake restoration and water quality management by the combined effects of polyaluminium chloride addition and benthivorous fish removal: a field mesocosm experiment

Shallow lake restoration and water quality management by the combined effects of polyaluminium chloride addition and benthivorous fish removal: a field mesocosm experiment

Effect of a size-selective biomanipulation on nutrient release by gizzard shad in Florida (USA) lakes

Increased light availability and nutrient cycling by fish provide resilience against reversing eutrophication in an agriculturally impacted reservoir

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