Potential Effect of Grass Carp Herbivory on Waterfowl Foods

McKnight, S. Keith; Hepp, Gary R.

doi:10.2307/3801948

Cited by 30 publications

(18 citation statements)

References 17 publications

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“…Il semble que leur sélectivité sur les plantes soit néfaste à l'équilibre du plan d'eau, en favorisant le développement des plantes les moins appétentes et en conséquence en déséquilibrant les populations d'invertébrés aquatiques, de poissons et d'oiseaux d'eau (KNIGHT et HEPP, 1995).…”

Section: %unclassified

Bilan des introductions des poissons d'eau douce en France

Keith

Allardi²

1997

Bull. Fr. Pêche Piscic.

107

166

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Section: %unclassified

Bilan des introductions des poissons d'eau douce en France

Keith

Allardi²

1997

Bull. Fr. Pêche Piscic.

107

166

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“…Invasive fish species can cause great harm to native biodiversity through herbivory (McKnight & Hepp ), predation (Almeida et al. ), competition (Caiola & De Sostoa ), hybridisation (Hänfling et al.…”

Section: Introductionmentioning

confidence: 99%

Environmental and economic impact assessment of alien and invasive fish species in Europe using the generic impact scoring system

Veer

Nentwig

2014

Ecology of Freshwater Fish

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Invasions by alien species are one of the major threats to the native environment. There are multifold attempts to counter alien species, but limited resources for mitigation or eradication programmes makes prioritisation indispensable. We used the generic impact scoring system to assess the impact of alien fish species in Europe. It prioritises species, but also offers the possibility to compare the impact of alien invasive species between different taxonomic groups. For alien fish in Europe, we compiled a list of 40 established species. By literature research, we assessed the environmental impact (through herbivory, predation, competition, disease transmission, hybridisation and ecosystem alteration) and economic impact (on agriculture, animal production, forestry, human infrastructure, human health and human social life) of each species. The goldfish/gibel complex Carassius auratus/C. gibelio scored the highest impact points, followed by the grass carp Ctenopharyngodon idella and the topmouth gudgeon Pseudorasbora parva. According to our analyses, alien fish species have the strongest impact on the environment through predation, followed by competition with native species. Besides negatively affecting animal production (mainly in aquaculture), alien fish have no pronounced economic impact. At the species level, C. auratus/C. gibelio show similar impact scores to the worst alien mammals in Europe. This study indicates that the generic impact scoring system is useful to investigate the impact of alien fish, also allowing cross‐taxa comparisons. Our results are therefore of major relevance for stakeholders and decision‐makers involved in management and eradication of alien fish species.

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“…It is unlikely that the absence of algae and fish in rudd stomachs in August resulted from stomach contents being retrieved via gastric lavage (Light et al, 1983). Selective feeding by the herbivorous grass carp has been shown to alter macrophyte assemblages (McKnight & Hepp, 1995). Similarly, selective feeding by rudds may pose a significant threat to native macrophyte assemblages and habitat restoration efforts that seek to reestablish macrophytes.…”

Section: Discussionmentioning

confidence: 98%

Feeding patterns and population structure of an invasive cyprinid, the rudd Scardinius erythrophthalmus (Cypriniformes, Cyprinidae), in Buffalo Harbor (Lake Erie) and the upper Niagara River

2012

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Feeding patterns and population structure of the non-native rudd Scardinius erythrophthalmus (Linnaeus) were examined to understand their ecology in Buffalo Harbor and the Niagara River. We hypothesized that (1) the diet of rudds would be omnivorous, but contain greater proportions of macrophytes in summer months, (2) feeding intensity would increase with water temperature, and (3) condition and growth would be similar to other populations. We collected rudds with a variety of gears in 2009 to test these hypotheses, and used data from 2007 to 2010 seining surveys to determine if the relative abundance of young-of-the-year rudd differed among sites with different flow conditions. Rudds were mostly herbivorous; they consumed aquatic macrophytes in summer and supplemented their diet with algae and fish in spring and fall. Feeding intensity was positively correlated with water temperature, but significantly reduced during spawning. Rudd condition and growth were greater than estimates from other populations, suggesting increases in abundance and range expansion are possible. Furthermore, reproduction was successful at lotic sites but very poor at sites without measureable flow, contrary to the paradigm of optimal rudd habitat. Research is needed to understand how herbivory by abundant rudd populations affects native aquatic communities.

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Potential Effect of Grass Carp Herbivory on Waterfowl Foods

Cited by 30 publications

References 17 publications

Bilan des introductions des poissons d'eau douce en France

Bilan des introductions des poissons d'eau douce en France

Environmental and economic impact assessment of alien and invasive fish species in Europe using the generic impact scoring system

Feeding patterns and population structure of an invasive cyprinid, the rudd Scardinius erythrophthalmus (Cypriniformes, Cyprinidae), in Buffalo Harbor (Lake Erie) and the upper Niagara River

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