Predictors of Relative Fish Biomass in Lakes and Reservoirs of Argentina

Quirós, Rolando

doi:10.1139/f90-107

Cited by 42 publications

(31 citation statements)

References 19 publications

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“…Attempts to predict fish assemblages and fishery yields in inland waters have considered variables related to site productivity, area and depth (Hanson & Legget, 1982;Eadie & Keast, 1984;Downing et al, 1990;Quiros, 1990). In Neotropical freshwaters, the prediction has challenged scientists for decades, and no obvious solution has been proposed (Gomes & Miranda, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Variables such as primary productivity, resource availability, nutrients, lake area and depth (Hanson & Legget, 1982;Eadie & Keast, 1984;Downing et al, 1990;Quiros, 1990) have been used to predict fish abundance, biomass and richness at large spatial extents (sensu Wiens, 1989), in temperate/sub-tropical reservoirs and lakes. Attempts to predict fish assemblages in Neotropical reservoirs, however, have produced less-successful results (Gomes & Miranda, 2001;Gomes et al, 2002;Piana et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes

2008

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Submerged macrophytes play an important role in structuring habitats and, therefore, in determining patterns of aquatic biodiversity. Because these plants are widespread in shallow areas of many Neotropical reservoirs, the present work investigated if variables related to habitat structure, measured in patches of submerged macrophytes (Egeria densa and E. najas), can be used to predict fish assemblage attributes (fish density and species richness). Based on patch characteristics at fine spatial extents (macrophyte patches within reservoir arms), we considered plant biomass, volume and proportional volume (i.e. percentage of macrophyte volume in the water column) as potential predictors. Fish and macrophytes were sampled with a 1-m 2 throw trap in littoral habitats of Rosana Reservoir, Paranapanema River, and simple correlation analyses were performed. Fish richness and abundance were highly correlated with all variables (R = 0.53 to 0.90), a relationship consistently observed in all sites. When compared to biomass, plant volume and proportional volume did not yield stronger correlations. We observed stronger correlations when E. densa and E. najas patches were analyzed separately (mono-specificity), probably because particular effects of each macrophyte on habitat structuring were removed (e.g. unnoticed morphological differences or unknown effects on habitat quality). The high R values observed in all pairwise relationships are uncommon in ecological studies, highlighting the predictive potential of variables related to habitat structure. These results suggest that, at small spatial extents, macrophyte biomass may represent an interesting predictor of fish density and richness in reservoirs with extensive colonization of submerged plants.As macrófitas aquáticas submersas desempenham um importante papel na estruturação de hábitats e, por isso, determinam padrões gerais de biodiversidade. Como essas plantas colonizam muitos reservatórios neotropicais, o presente trabalho investigou simples relações capazes de predizer atributos de assembléias de peixes (densidade e riqueza) a partir de variáveis relacionadas à estruturação do habitat, medidas em manchas de macrófitas submersas (Egeria densa e E. najas). Baseando-se em características das manchas em pequenas escalas espaciais (bancos de macrófitas em braços do reservatório), nós consideramos a biomassa de plantas, volume e volume proporcional (percentual de volume de macrófitas na coluna d'água) como preditores em potencial. Peixes e macrófitas foram amostrados com uma armadilha de arremesso (1-m 2 ) em hábitats litorâneos do reservatório de Rosana, rio Paranapanema, e correlação simples foram utilizadas para analisar as relações. Todas as variáveis apresentaram correlação positiva com a riqueza e densidade de peixes (R = 0.53 to 0.90), uma relação consistentemente observada nos três locais amostrados. Com relação à performance individual de cada variável, o volume e o volume proporcional não aumentaram a magnitude das correlações quando comparados à biomassa de m...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes

2008

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“…Jones & Hoyer (1982) and Scarborough & Peters (1993) used fish yield to anglers based on standardised sampling programs while Hanson & Leggett (1982) used long-term yield to commercial fishermen as measures of abundance. Others (Kautz 1980;Yurk & Ney 1989;Downing et al 1990;Bachmann et al 1996) used standing crops (in three of the four datasets based on rotenone sampling) while Jeppesen et al (1997) and Quiros (1990) present catch per unit effort based on multipanel gillnetting. Data available only from figures were scanned and digitised using WinDIG software (v2.5; http://www.unige.ch/ sciences/chifi/cpb/windig.html).…”

Section: Methodsmentioning

confidence: 99%

The direct contribution of fish to lake phosphorus cycles

Griffiths

2006

Ecology of Freshwater Fish

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Un resumen en españ ol se incluye detrás del texto principal de este artículo. IntroductionFish affect lacustrine nutrient dynamics directly and indirectly. Direct effects occur by the regeneration (excretion and egestion), sequestration and translocation of nutrients (Vanni 2002) while indirect effects result from feeding activities that alter community structure, e.g., differential predation effects on zooplankton composition or zoobenthic biomass. Considerable uncertainty exists over the importance of direct fish effects, relative to other biota, in the internal nutrient cycling of lakes. Fish excretion rates have been shown to be relatively large in some lakes (Kraft 1993;Schindler et al. 1993;Persson 1997) and small in others (Nakashima & Leggett 1980;Boers et al. 1991;Helminen & Sarvala 1997;Gido 2002) but there has been no systematic evaluation of their contribution across lakes.From an analysis of bioenergetic models, Schindler & Eby (1997) showed that phosphorus excretion rates for individual fish were functions of fish mass, the phosphorus content of their prey and the environmental temperature. They showed that the phosphorus content of prey items increased with predator size, due to the ontogenetic dietary shift to more phosphorusrich benthic invertebrate and fish prey items. Sterner & Elser (2002) demonstrate that the contribution of consumers to nutrient recycling depends on the difference between the nutrient content of the consumer and its food. They pointed out that Schindler & Eby (1997) made no allowance for differences in the nutrient requirements of the (predominantly predatory) fish species they considered and that Vanni et al. (2002) have shown that the phosphorus content of food influences phosphorus excretion rates when algivorous/detritivorous fish are included in analyses. I ignore this more sophisticated stoichiometric view because relatively few species in glaciated regions of Europe and North America are specialist feeders on algae/detritus (D. Griffiths, unpublished data) and because the fish assemblages analysed here come mainly from these regions and contain a variety of trophic levels. Consequently, I assume that the impact of phosphorus regeneration by fish at the ecosystem level will depend largely on how their biomass, size and diet change with ecosystem productivity. Abstract -Published data are synthesised to assess the direct contribution of fish to the recycling of phosphorus across a lake productivity gradient. Phosphorus excretion rates by fish assemblages are more or less directly proportional to fish biomass, despite changes in mean body mass, species composition and diet with increasing lake productivity. Piecewise linear regression of published data shows for the first time that lacustrine fish biomass increases with total phosphorus (TP) concentration in the water column up to around 140 lgAETPAEl )1 but levels off above that value, suggesting that fish contribute less to nutrient recycling as lake productivity increases. The results confirm previous findings that ...

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“…Given that fish learn from the behavior and chemical cues of other fishes (Brown et al, 2003;Webster et al, 2008), the surface feeding and spatial use typical of rainbow trout farm escapees (Chittenden et al, 2011;Skilbrei, 2012;Patterson and Blanchfield, 2013) may influence the behavior of conspecifics, particularly those naïve fishes reaching the reservoir after birth in tributaries. In oligotrophic environments like those in Patagonia, where wild fish biomass is low (Quirós, 1990), the effect of the massive and sustained input of farm escapees on wild fish behavior is likely to be important, favoring a surface restricted distribution.…”

Section: Discussionmentioning

confidence: 99%

Native and exotic fishes in a Patagonian reservoir with rainbow trout cage culture: spatial and trophic resource use

Jodar

Becker

Blasetti³

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-Although the interactions of exotic salmonids with native Patagonian fishes are well known, little is known about the ecology and impact of farmed fish escapees. Salmonid production in Argentina is largely concentrated in the Alicurá reservoir in north Patagonia, where fish community studies have been scarce. Here, we assess and compare the spatial distribution, body size-condition and diet of the different fish species in this reservoir. Strong vertical segregation was observed between exotic rainbow trout Oncorhynchus mykiss (both escapees and wild), dominating the littoral zone, and native Percichthys trucha which dominate the medium and deep strata. Low piscivory-benthivory and high zooplanktivory were observed for rainbow trout, both traits being uncommon at a regional scale. Escaped farmed rainbow trout (ERT) diet included abundant indigestible items along with wild prey. Higher body condition of P. trucha close to farms, as well as the regionally unprecedented high incidence of Daphnia sp. in the guts of all the species suggest that farm nutrient discharges have had significant impacts. Finally, the high body condition of ERT, together with their wild food diet and the long dispersal distance observed, demonstrate post-escape success, drawing our attention to potential upstream dispersion affecting the biodiversity and fisheries of Patagonian rivers and lakes.Keywords: aquaculture impact / freshwater salmonid / niche segregation / diet / Patagonia Résumé -Poissons indigènes et exotiques dans un réservoir de Patagonie avec aquaculture en cage de truites arc-en-ciel : utilisation des ressources spatiales et trophiques. Bien que les interactions des salmonidés exotiques avec les poissons patagoniens indigènes soient bien connues, on connaît peu l'écologie et l'impact des poissons échappés d'élevage. La production de salmonidés en Argentine est largement concentrée dans le réservoir d'Alicurá dans le nord de la Patagonie, où les études sur les communautés de poissons ont été rares. Ici, nous évaluons et comparons la répartition spatiale, la taille du corps et l'alimentation des différentes espèces de poissons dans ce réservoir. Une ségrégation verticale forte a été observée entre la truite arc-en-ciel exotique Oncorhynchus mykiss (à la fois évadée et sauvage), dominant la zone littorale et Percichthys trucha natif qui domine les couches moyennes et profondes. Un faible comportement piscivore-benthivore et un régime zooplanctivore important ont été observés pour la truite arc-en-ciel, les deux traits étant peu fréquents à l'échelle régionale. Le régime de la truite arc-en-ciel échappée des cages (ERT) comprenait des composés indigestes abondants et des proies sauvages. Un coefficient de condition élevé de P. trucha près des fermes, ainsi que l'incidence locale sans précédent de Daphnia sp. dans les estomacs de toutes les espèces suggère que les rejets de nutriments aquacoles ont eu des impacts importants. Enfin, le bon état corporel des ERT, ainsi que leur régime alimentaire et la longue distance de ...

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Predictors of Relative Fish Biomass in Lakes and Reservoirs of Argentina

Cited by 42 publications

References 19 publications

Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes

Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes

The direct contribution of fish to lake phosphorus cycles

Native and exotic fishes in a Patagonian reservoir with rainbow trout cage culture: spatial and trophic resource use

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