Non-native fishes homogenize native fish communities and reduce ecosystem multifunctionality in tropical lakes over 16 years

Moi, Dieison André; Alves, Diego Corrêa; Figueiredo, Bruno R. S.; Antiqueira, Pablo A. P.; Mello, Franco Teixeira de; Romero, Gustavo Q.; Mormul, Roger Paulo; Bonecker, Cláudia Cósta

doi:10.1016/j.scitotenv.2020.144524

Cited by 19 publications

(21 citation statements)

References 53 publications

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“…The main drivers of the declines detected here were a combination of decreased turbidity and increased invasions of non-native insectivorous fish and changes in N : P stoichiometry over time. All these drivers exemplify human impacts caused by reservoir construction [12,24,25].…”

Section: Discussionmentioning

confidence: 99%

“…Decreased turbidity, which translates to increased water transparency, is closely related to sediment and nutrient deposition upstream, trapped by reservoir cascades built in the Upper Paraná basin [12]. In concert with increasing water transparency, the upper Paraná River floodplain underwent massive fish invasion caused by a hydroelectric power plant built downstream, which removed their natural geographical barrier (a set of waterfalls) separating the Lower from the Upper Paraná River [16,24,25]. The increase in non-native predators and water transparency likely strengthened the top-down control of insect prey which, bearing a dark integument, had reduced ability to camouflage.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies have reported a decrease in native fish diversity associated with accelerated invasions of non-native fish over time [24,25]. We sampled these non-native, insectivorous fish in each aquatic environment using two gear types: seines and gillnets.…”

Section: Methodsmentioning

confidence: 99%

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Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

et al. 2021

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Insect abundance and diversity are declining worldwide. Although recent research found freshwater insect populations to be increasing in some regions, there is a critical lack of data from tropical and subtropical regions. Here, we examine a 20-year monitoring dataset of freshwater insects from a subtropical floodplain comprising a diverse suite of rivers, shallow lakes, channels and backwaters. We found a pervasive decline in abundance of all major insect orders (Odonata, Ephemeroptera, Trichoptera, Megaloptera, Coleoptera, Hemiptera and Diptera) and families, regardless of their functional role or body size. Similarly, Chironomidae species richness decreased over the same time period. The main drivers of this pervasive insect decline were increased concurrent invasions of non-native insectivorous fish, water transparency and changes to water stoichiometry (i.e. N : P ratios) over time. All these drivers represent human impacts caused by reservoir construction. This work sheds light on the importance of long-term studies for a deeper understanding of human-induced impacts on aquatic insects. We highlight that extended anthropogenic impact monitoring and mitigation actions are pivotal in maintaining freshwater ecosystem integrity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

et al. 2021

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“…The seine net had a length of 20 m (0.5 cm between knots) and the sampled area varied from 30.2 m² to 367.09 m², according to the sampled biotope (average seined area 247.69 ± 51.52 m 2 ). Further details of the standardised sampling program are available in the literature (Ceschin et al 2018;Moi et al 2021). Each sampling unit ( ) represented gillnetting or seining in each locality and campaign.…”

Section: Study Site and Samplingmentioning

confidence: 99%

“…However, such experiments can be extreme simplifications of ecosystems (Duffy 2009). Considering the importance of BEF empirical evidence on aquatic communities, long-term approaches are an opportunity to measure fish biomass and species richness in the field (Moi et al 2021). Standardised monitoring programs are also an opportunity to evaluate biomass and species richness as a measure of propagule and colonisation pressures (Lockwood et al 2009) through time and space.…”

Section: Introductionmentioning

confidence: 99%

Long-term colonisation and propagule pressure of fish assemblages in a Neotropical floodplain

Bezerra

Libralato

Kubečka

et al. 2021

Preprint

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Biological invasions are a major threat to biodiversity in the Neotropical region. However, few studies have evaluated the mechanisms underlying the long-term establishment of fish propagules in aquatic environments. Here, we associated fish biomass, species richness, and proportion of non-native species (contamination index) to quantify propagule and colonisation pressures, and fish biodiversity (measured by the Kempton’s index) in lakes and rivers of the Parana River floodplain. We organised species into native and non-native assemblages sampled by gillnetting and beach seining in spatio-temporal gradients, seasonally, from 2000 to 2017. Native and non-native Kempton’s indices were inversely correlated, native extinctions occurred locally with non-native biotic differentiation in lakes, rivers, and ecosystem contamination. A constant propagule pressure resulted in an overwhelming biodiversity of non-natives at the end of the evaluated time series. Biotic resistance to introduction was not evidenced in our deterministic trends. The observed patterns agreed with previous studies highlighting native biotic homogenisation and species extinctions, depending on biological invasions, landscape connectivity, and riverine impoundments. Long-term propagule pressure and non-native fish colonisation were the drivers of biodiversity that led to the predominance of non-native over native assemblages in the Parana River floodplain.

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How does invasion degree shape alpha and beta diversity of freshwater fish at a regional scale?

Gavioli

Milardi

Soininen

et al. 2022

Ecology and Evolution

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Freshwater ecosystems appear more vulnerable to biodiversity loss due to several anthropogenic disturbances and freshwater fish are particularly vulnerable to these impacts. We aimed to (1) identify the contribution of land use, spatial variables, and invasion degree in determining freshwater fish alpha (i.e., species richness) and beta (i.e., local contributions to beta diversity, LCBD) diversity, evaluating also the relationship between invasion degree and nestedness (β$$ \beta $$nes) and turnover (β$$ \beta $$sim) components of beta diversity. (2) Investigate the relationship between alpha diversity and LCBD, under the hypothesis that alpha diversity and LCBD correlate negatively and (3) investigate the relationship between species contributions to beta diversity (SCBD) and species occurrence, hypothesizing that non‐native species show a lower contribution to beta diversity. The linear mixed models and the partition of R2 retained the invasion degree as the most important variables explaining alpha and beta diversity, having a positive relationship with both diversity components. Furthermore, land use related to human impacts had a positive influence on alpha diversity, whereas it showed a negative effect on LCBD. Regression model further showed that invasion degree related positively with β$$ \beta $$sim, but negatively with β$$ \beta $$nes, suggesting that non‐native species were involved in the replacement of native species in the fish community. Alpha diversity and LCBD showed a weak positive correlation, meaning that sites with low species richness have higher LCBD. SCBD scaled positively with species occurrence highlighting that rarer species contribute less to SCBD. Finally, native and exotic species contributed similarly to beta diversity. These results suggest that invasion degree plays a central role in shaping alpha and beta diversity in stream fish, more than land use features reflecting habitat alteration or other geospatial variables. Furthermore, it is important to evaluate separately the native and the non‐native components of biotic communities to identify linkages between invasion dynamics and biodiversity loss.

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Non-native fishes homogenize native fish communities and reduce ecosystem multifunctionality in tropical lakes over 16 years

Cited by 19 publications

References 53 publications

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

Long-term colonisation and propagule pressure of fish assemblages in a Neotropical floodplain

How does invasion degree shape alpha and beta diversity of freshwater fish at a regional scale?

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