Linking Landscapes and Food Webs: Effects of Omnivorous Fish and Watersheds on Reservoir Ecosystems

Vanni, Michael J.; Arend, Kristin K.; Bremigan, Mary T.; Bunnell, David B.; Garvey, James E.; González, María J.; Renwick, William H.; Soranno, Patricia A.; Stein, Roy A.

doi:10.1641/0006-3568(2005)055[0155:llafwe]2.0.co;2

Cited by 119 publications

(150 citation statements)

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“…This productivity changes affect biotic interactions, which in turn provides advantages to omnivorous fishes (Karr, 1993;Vanni et al, 2005). For example, exotic, small-sized, and short-lived species (Oreochromis spp.)…”

Section: Discussionmentioning

confidence: 99%

Long term changes in the fish fauna of Lago de Patzcuaro in Central Mexico

Ramírez-Herrejón¹,

Zambrano²,

Mercado‐Silva³

et al. 2014

lajar

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ABSTRACT. Fish assemblages of lakes from central México have been altered as a result of water overexploitation, pollution, habitat fragmentation, and introduction of exotic species. Patterns and the extent of change in most of these systems are poorly documented. This paper presents a long-term study of changes in the fish fauna of Lago de Pátzcuaro (State of Michoacán, México). Long-term information (years 1900-2010) of fish communities was used to explore trends in the composition of the fish community and their ecological attributes. Trends across time for each fish guild were evaluated through a multivariate analysis of variance. Native species dominated total species richness over the entire study period, but exotic fish comprised 46% of the community in the 2010s. During the last 110 years, there has been a decline in the number of carnivore species and an increase of omnivore species in the Lago de Pátzcuaro fish community. Sensitive species have disappeared from the lake and species tolerant to environmental degradation have increased from 13 to 61%. The data suggest that anthropic effects on the environmental condition of Lago de Pátzcuaro are associated with the loss of ecosystem elements (fish species) and ecosystem processes (species interactions). Ecological restoration and conservation programs must include information of these long term studies to be more effective in their efforts. Keywords: shallow lake, environmental degradation, ecological guilds, historical analysis, exotic species, México.Cambios a largo plazo en la fauna de peces del Lago de Pátzcuaro en México central RESUMEN. El ensamble de las comunidades de peces en los lagos de México Central ha sido alterado como resultado de la sobre-explotación del agua, contaminación, fragmentación de hábitat y la introducción de especies exóticas. Los patrones y la extensión de los cambios en la mayoría de estos ecosistemas están escasamente documentados. Este artículo presenta un estudio a largo plazo de los cambios en la fauna de peces del Lago de Pátzcuaro (Estado de Michoacán, México). La información a largo plazo (años 1900-2010) de las comunidades de peces fue usada para explorar las tendencias en la composición específica y los atributos ecológicos de las especies en la comunidad. Las tendencias a través del tiempo para cada gremio de peces fueron evaluadas mediante análisis de varianza multivariado. Las especies nativas dominaron a través de todo el periodo de estudio, pero las especies exóticas alcanzaron 46% de la comunidad en la década del 2010. Durante los últimos 110 años, ha habido disminución en el número de especies carnívoras e incremento de las especies omnívoras en este ecosistema. Las especies intolerantes han desaparecido del lago y las especies tolerantes a la degradación ambiental han incrementado de 13 a 61%. Los datos sugieren que los efectos antrópicos sobre la condición ambiental del Lago de Pátzcuaro se asocian con la pérdida de elementos (especies de peces) y procesos (interacciones entre las especies) del ecosistema....

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Section: Discussionmentioning

confidence: 99%

Long term changes in the fish fauna of Lago de Patzcuaro in Central Mexico

Ramírez-Herrejón¹,

Zambrano²,

Mercado‐Silva³

et al. 2014

lajar

View full text Add to dashboard Cite

show abstract

“…However, fish can serve as a link between watershed nutrients and food webs. The sediment-feeding gizzard shad (Dorosoma cepedianum Lesueur) in North American warmwater reservoirs is subsidized directly by allochthonous detritus and indirectly by phytodetritus from phytoplankton production stimulated by watershed subsidies (Vanni et al 2005). Although fishes may act rather as a long-term nutrient sink, the excreted part of the phosphorus consumed is readily available to phytoplankton (Brabrand et al 1990), and thus direct and indirect allochthonous sources of phosphorus for fish feeding may indirectly subsidize the primary production within a lake.…”

Section: Discussionmentioning

confidence: 99%

Can feeding of fish on terrestrial insects subsidize the nutrient pool of lakes?

et al. 2005

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We estimated consumption and excretion rates of terrestrial-borne phosphorus by a population of the insectfeeding fish species bleak (Alburnus alburnus) in a 0.12-km 2 mesotrophic lake of the German lowlands. Fish abundance, growth rates, and diet composition were determined, and consumption and nutrient metabolism were calculated by a bioenergetics model. Mean bleak abundance was about 77,000 ind. km Ϫ2. About 84% of bleak consumption consisted of terrestrial insects. Annual consumption of lake-external phosphorus (P) by bleak was 432 g, representing ϳ2.1% of the lake internal P-pool. Annual excretion of terrestrial-derived phosphorus by bleak was equivalent to ϳ11% of the mean epilimnetic SRP concentration. A substantial subsidy of lake nutrient pools by insectivorous fish is more likely in lakes Ͻ0.03 km 2 owing to the increasing perimeter-to-area ratio between donor and recipient habitats. Terrestrial nutrient subsidy by fish feeding may be important only in small oligotrophic lakes in forested areas.

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“…It may favour the increase of particular fish species through nutrient enrichment and cause major disruptions in food webs through altered predator-prey relationships (e.g. Vanni et al 2005). It introduces novel and alien substances such as biocides to which there has been little time for evolution of defensive mechanisms.…”

Section: Agriculture As Kali and Ceresmentioning

confidence: 99%

Water pollution by agriculture

Moss

2007

Phil. Trans. R. Soc. B

364

165

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Agriculture disrupts all freshwater systems hugely from their pristine states. The former reductionist concept of pollution was of examining individual effects of particular substances on individual taxa or sub-communities in freshwater systems, an essentially ecotoxicological concept. It is now less useful than a more holistic approach that treats the impacts on the system as a whole and includes physical impacts such as drainage and physical modification of river channels and modification of the catchment as well as nutrient, particulate and biocide pollution. The European Water Framework Directive implicitly recognizes this in requiring restoration of water bodies to 'good ecological quality', which is defined as only slightly different from pristine state. The implications for the management of agriculture are far more profound than is currently widely realized.

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Linking Landscapes and Food Webs: Effects of Omnivorous Fish and Watersheds on Reservoir Ecosystems

Cited by 119 publications

References 49 publications

Long term changes in the fish fauna of Lago de Patzcuaro in Central Mexico

Long term changes in the fish fauna of Lago de Patzcuaro in Central Mexico

Can feeding of fish on terrestrial insects subsidize the nutrient pool of lakes?

Water pollution by agriculture

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