Aquatic invasive species: general trends in the literature and introduction to the special issue

Thomaz, Sidinei Magela; Kovalenko, Katya E.; Havel, John E.; Kats, Lee B.

doi:10.1007/s10750-014-2150-8

Cited by 90 publications

(61 citation statements)

References 48 publications

(54 reference statements)

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“…However, this should be a concern when using this approach for the whole macroinvertebrate assemblages, especially given the many cases of mollusk and mosquito exotic species invasions in South America (e.g. Thomaz et al 2014).…”

Section: Considerations On Taxa Preferences and Tolerancesmentioning

confidence: 99%

A predictive index based on environmental filters for the bioassessment of river basins without reference areas in Atlantic Forest biome, Brazil

2019

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Biological assessments that use the reference condition approach are based on the concept of comparing a site's observed biology to sites where disturbance is minimal or absent. However, in many regions of the world, such areas are scarce or nonexistent. In this study, an alternative approach proposed by Chessman and Royal for bioassessment without reference areas based on environmental filters was tested in Brazil. This approach assumes that key environmental features act in the selection of potential colonists, from a regional pool of taxa, based on the ecological traits (tolerances) possessed by each taxon. We developed the approach by: 1) determining the regional pool, based on a large Atlantic Forest biome database; 2) selecting environmental filters (elevation, original vegetation and soil type); and 3) including information on the tolerance and preferences of aquatic insects to these filters. With this information we were able to determine the expected taxon under natural conditions and compare with observed taxon, developing a predictive index (Observed/Expected). Although the model was intended to predict the fauna in regions without reference sites, we included reference areas to test the model responsiveness, precision and sensitivity. Our results indicated that the index was able to discriminate impairment classes (F=56.9; p<0,001), it has high precision due to low standard deviation across reference sites values (SD=0.098) and high sensitivity due the correlation with environmental variables that are sensitive to human alteration (r=0.74, p<0.01). Also, it was strongly correlated with multimetric indices developed for multiple watersheds in the state, showing agreement between the methods in relation to ecological quality classification. Even though the predictive index had performed well in our study, we make some considerations that may help to improve its sensitivity of similar methods that are being tested using the environmental filters approach.

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Section: Considerations On Taxa Preferences and Tolerancesmentioning

confidence: 99%

A predictive index based on environmental filters for the bioassessment of river basins without reference areas in Atlantic Forest biome, Brazil

2019

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“…Freshwater biodiversity has constantly been threatened by the introduction of invasive species [13], reducing the presence of native species and their local populations [14]. Although far from the most highly populated areas of the world, Patagonia exhibits a high number of introduced species, including salmonid fishes.…”

Section: Introductionmentioning

confidence: 99%

Invasive species and postglacial colonization: their effects on the genetic diversity of a Patagonian fish

2019

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The present distribution of Patagonian species is the result of a complex history involving Quaternary refugial populations, Holocene range expansions and demographic changes occurring during the Anthropocene. Invasive salmonids were introduced in Patagonia during the last century, occupying most rivers and lakes, preying on and competing with native species, including the fish Galaxias platei. Here, we used G. platei as a case study to understand how long-term (i.e. population differentiation during the Holocene) and short-term historical processes (salmonid introductions) affect genetic diversity. Using a suite of microsatellite markers, we found that the number of alleles is negatively correlated with the presence of salmonids (short-term processes), with G. platei populations from lakes with salmonids exhibiting significantly lower genetic diversity than populations from lakes without salmonids. Simulations (100 years backwards) showed that this difference in genetic diversity can be explained by a 99% reduction in population size. Allelic richness and observed heterozygosities were also negatively correlated with the presence of salmonids, but also positively correlated with long-term processes linked to Quaternary glaciations. Our results show how different genetic parameters can help identify processes taking place at different scales and their importance in terms of conservation.

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“…Impacts may be dramatic because freshwater systems feature the greatest density of species per unit surface area on the planet (Thomaz et al. , Lozano and Brundu ). Invasive alien species negatively impact aquatic communities, particularly macrophyte, zooplankton, and fish assemblages, and promote physical alterations in nitrogen and organic matter concentration, and changes to water turbidity (Gallardo et al.…”

Section: Introductionmentioning

confidence: 99%

Inconsistencies in the risk classification of alien species and implications for risk assessment in the European Union

et al. 2017

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Abstract. Invasive alien species (IAS) are species whose introduction or spread outside their native range threatens biological diversity, ecosystem functioning, economy, and/or public health. The recent European Union (EU) regulation on the management of IAS emphasizes the need for a consistent approach to alien species assessment that will underpin international measures for the early identification of newly introduced IAS followed by rapid action aimed at the prevention of introduction, spread, and negative impacts. The goals of the present study were (1) to present the risk classifications of 18 aquatic alien species for The Netherlands using the Invasive Species Environmental Impact Assessment protocol, (2) to compare these with available risk classifications made for countries spanning similar climatic and biogeographical regions to the EU, and (3) to provide explanations for inconsistencies between different risk classifications. Five species were classified as high risk: Carassius gibelio (Prussian carp), Cyprinus carpio (common carp), Sander lucioperca (pike-perch), Cabomba caroliniana (fanwort), and Dreissena rostriformis bugensis (quagga mussel). Of the 14 species with existing risk classifications for countries spanning similar climatic and biogeographical regions to the EU, all but two of the assessed species (C. gibelio and D. rostriformis bugensis) were classified inconsistently. Reasons for these inconsistencies are the application of different risk assessment schemes, application on a national rather than biogeographical scale, differences in the definition and application of criteria, differences in habitat availability, and uncertainties that are intrinsic to risk assessment methodologies. Approaches that increase transparency by highlighting these methodological aspects, normative choices, and uncertainties are vital to the legitimacy of any risk assessment method and will increase acceptance among decision makers, nature managers, and stakeholders.

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Aquatic invasive species: general trends in the literature and introduction to the special issue

Cited by 90 publications

References 48 publications

A predictive index based on environmental filters for the bioassessment of river basins without reference areas in Atlantic Forest biome, Brazil

A predictive index based on environmental filters for the bioassessment of river basins without reference areas in Atlantic Forest biome, Brazil

Invasive species and postglacial colonization: their effects on the genetic diversity of a Patagonian fish

Inconsistencies in the risk classification of alien species and implications for risk assessment in the European Union

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