The dynamics of fish populations in the Palancar stream,a small tributary of the river Guadalquivir, Spain

Bravo, R.; Soriguer, Milagrosa C.; Villar, Noelia; Hernando, J. A.

doi:10.1016/s1146-609x(00)01098-5

Cited by 27 publications

(25 citation statements)

References 27 publications

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“…Fish abundance also increased along the longitudinal gradient, as previously reported in Mediterranean streams (Bravo et al, 2001;Magalhães et al, 2002), except in the last sampling site where fish abundance decreased (Fig. 3) because flow became lower than in upstream sampling sites, particularly in the very dry summer of 2001.…”

Section: Fish Assemblage In Tordera Streamsupporting

confidence: 83%

Assessing fish metrics and biotic indices in a Mediterranean stream: effects of uncertain native status of fish

et al. 2008

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Implementation of the Water Framework Directive requires tools for measuring and monitoring the ecological status of aquatic ecosystems. Several indices are in use in the Iberian Peninsula, although there has been little comparison among them. We sampled the fish assemblage and limnological features of the Tordera stream (NE Spain) quarterly from September 2001 to May 2003 to evaluate the usefulness of several fish metrics and to compare habitat quality and biotic indices currently in use. Data for eight biotic and abiotic indices for this and three other Catalan river basins were also compiled in order to analyse the relationships among indices. In the Tordera stream, fish abundance and richness increased with stream order except in the last sampling site that had the lowest fish abundance owing to the effects of drought and water abstraction. Although most indices were positively correlated, some displayed low or null correlations particularly for the Tordera basin which is more affected by water abstraction and less by pollution; a commonly used physico-chemical index (ISQA) was the least correlated. In a regional fish index (IBICAT) under development, the brown trout (Salmo trutta) has been previously considered as introduced in the Tordera basin. Here, we report an old published record that demonstrates that trout was present before 1845 and we argue that its status should be considered as uncertain given the current information available. Whether brown trout is treated as native or introduced to this river basin has profound effects on the results of fish metrics because of its dominance in the upper reaches. We briefly discuss the role of introduced species, particularly in headwater streams, in the development of fish indices. Our study exemplifies the need for careful, basin-specific assessment of native/introduced status in the development of fish metrics.

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Section: Fish Assemblage In Tordera Streamsupporting

confidence: 83%

Assessing fish metrics and biotic indices in a Mediterranean stream: effects of uncertain native status of fish

et al. 2008

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“…The effects of flooding and drought upon fish communities and assemblages have been studied extensively in many streams and under many conditions (Harrell, 1978;Ross & Baker, 1983;Bravo et al, 2001;Medeiros & Maltchik, 2001). Our data on fish assemblage changes, in combination with water chemistry data, hydrologic data, and size distribution information, allow for a more Water chemistry in both watersheds was significantly different in 2000 compared to 2003, with the observed changes in the composition of the stream water consistent with the increase in rainfall in 2003.…”

Section: Discussionmentioning

confidence: 61%

Impact of drought upon fish assemblage structure in two South Carolina Piedmont streams

2005

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The effects of drought on fish assemblages were studied in the Indian Creek (228 km 2 ) and Kings Creek (46 km 2 ) watersheds located in the Piedmont Province of South Carolina. Water and fish samples were collected at 13 localities during drought conditions in 2000 and again under post-drought conditions in 2003. Abundance, species richness, and Simpson's diversity were calculated for each locality, and the masses and lengths of individual fishes were measured to determine total biomass and length distributions for each species. Assemblages were significantly different from 2000 to 2003 at 10 of the 13 sample localities (v 2 test for association; p < 0.05). The family Cyprinidae (minnows) was numerically dominant in both years and in both watersheds, but their dominance declined somewhat following the drought due to lower numbers of Nocomis leptocephalus and Notropis lutipinnis in 2003 collections. However, some cyprinids increased in abundance in 2003 collections, most notably Semotilus atromaculatus and Hybopsis hypsinotus. Abundance of catostomids (suckers) and ictalurids (catfish) was also decreased post drought. Conversely, centrarchids (sunfish) increased in dominance in 2003, especially the species Lepomis macrochirus and Lepomis gulosus. Many more juveniles and young of the year were observed in 2003 collections, suggesting that most species exhibited greater reproductive success following the drought. The significant differences in water chemistry observed between the two years were not associated with any change in fish community structure. Instead, we attributed the observed differences in fish assemblages to changes in habitat structure associated with higher rainfall during post-drought conditions. Finally, sample localities showed high variability in common measures of assemblage structure, including abundance, species richness, and diversity. We hypothesize that the observed variability in community structure is caused by the heterogeneous habitat structure and morphology of these small Piedmont Province streams.

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“…These species cause major problems by preying on endemic fish (Bravo et al. ) and amphibians (Bosch et al. ).…”

Section: Resultsmentioning

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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The dynamics of fish populations in the Palancar stream,a small tributary of the river Guadalquivir, Spain

Cited by 27 publications

References 27 publications

Assessing fish metrics and biotic indices in a Mediterranean stream: effects of uncertain native status of fish

Assessing fish metrics and biotic indices in a Mediterranean stream: effects of uncertain native status of fish

Impact of drought upon fish assemblage structure in two South Carolina Piedmont streams

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

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