Presence of riparian vegetation increases biotic condition of fish assemblages in two Brazilian reservoirs

Ferreira, Fábio Cop; Souza, Ursulla Pereira; Petrere, Miguel

doi:10.1590/s2179-975x4514

Cited by 4 publications

(4 citation statements)

References 40 publications

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“…In some cases, the aspects considered in different aquatic ecosystems were standardized. This was especially relevant to studies in reservoirs, which had predictable metrics (FERREIRA et al, 2015) as a result of known anthropic disturbances (CROOK et al, 2015;GRACEY;VERONES, 2016) and previous knowledge of the ecology of these environments. On the other hand, estuarine environments presented greater variation between regions with regard to the ecology of local species and the conditions considered as minimally impacted, being necessary adaptations according to intrinsic characteristics to the indicator group (VIANA et al, 2012;FISCH et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Trends in the application of multimetric indexes in Brazil: scienciometric analyses related to fish Fauna

Ticiani

Bogoni

Eichelberger

et al. 2018

CeN

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The evaluation of biotic integrity through multimetric analysis of the attributes of fish fauna is recognized as an important tool for water management and conservation policies. In this sense, the present study sought to elucidate tendencies in the use of the most used metrics in multimetric indices (MMIs), based on the fish assemblage, in Brazil. An electronic search of the literature was carried out in indexing databases of periodicals. The criteria used for the selection of scientific articles were to be carried out in Brazilian territory and the use of MMI with fish. Of total, 51.9% of the studies were applied in streams, with no temporal pattern. The highest concentration of studies was observed in the southeast region. In all, 99 different metrics were used, highlighting attributes related to trophic, tolerance and species composition. There was a increment of specific metrics over the years and environments, with the exception of rivers. In comparison to other environments, streams had significantly different metrics. Difficulties in the MMI proposal in Brazil are linked to the selection of aspects that characterize the condition of a habitat before the diagnosis of the ecological components in the classification of the environmental quality.

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Section: Resultsmentioning

confidence: 99%

Trends in the application of multimetric indexes in Brazil: scienciometric analyses related to fish Fauna

Ticiani

Bogoni

Eichelberger

et al. 2018

CeN

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“…they likely offer less refuges for smaller fish than unburnt forests (Ferreira et al, 2015;Gois et al, 2012). In addition, higher light penetration in the aquatic environment of fire scars could increase visibility and hunting success of diurnal, visually oriented predatory fishes, such as S. gouldingi, which in turn could influence local fish assemblages (Rodríguez & Lewis Jr, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…The fish size distribution of the most abundant fish species, S. gouldingi (18% of all individuals caught), shows a shift from smaller‐sized individuals in unburned floodplain forests to larger‐sized individuals in fire scars and white‐sand savannas (Figure 5b,c). Fire scars have an open vegetation with less trees (Flores et al, 2016) and therefore they likely offer less refuges for smaller fish than unburnt forests (Ferreira et al, 2015; Gois et al, 2012). In addition, higher light penetration in the aquatic environment of fire scars could increase visibility and hunting success of diurnal, visually oriented predatory fishes, such as S. gouldingi , which in turn could influence local fish assemblages (Rodríguez & Lewis Jr, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…At the same time, the higher availability of exposed sandy soils in burned areas (Flores & Holmgren, 2021a) could favour fish species that forage by sifting finely particulate detritus associated to the substrate. The loss of woody biomass in fire scars may also reduce the availability of refuges that could facilitate hiding from predators and safe reproduction (Ferreira et al, 2015; Gois et al, 2012; Wright & Flecker, 2004), making burned areas good hunting grounds for (large) predatory fish, but poor and dangerous places for (smaller) herbivorous and omnivorous fish species. We therefore expected these ecological changes to be reflected in the relative abundance of different fish trophic categories as well as in the size structure of the fish communities after forest fires.…”

Section: Introductionmentioning

confidence: 99%

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Fish on Fire: Shifts in Amazonian fish communities after floodplain forest fires

Lugo‐Carvajal

Holmgren

Zuanon

et al. 2023

Journal of Applied Ecology

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Severe droughts can lead to fires that cause massive tree mortality in even the wettest and most isolated Amazonian forests. After repeated fires, blackwater floodplain forests can remain in an open vegetation state of arrested succession that facilitates a transition towards a white‐sand ‘savanna‐like’ vegetation. These vegetation shifts, from closed‐canopy floodplain forests to open fire scars and eventually white‐sand savannas, may have profound implications for fish communities that depend on floodplain forests for food and recruitment. In turn, changes in fish communities may contribute to the arrested forest recovery after fires as fish are important seed dispersal agents for many floodplain tree species. To explore the impacts of floodplain forest fires on fish communities, we sampled fish in unburnt forests, fire scars, and white‐sand savannas in the middle Rio Negro basin (Brazil) during two consecutive flooding seasons. We compared the abundance, species richness, and the taxonomic and trophic composition of fish assemblages across the three habitat types. We found significant shifts in fish assemblages in fire scars compared to unburnt floodplain forests. Also, as fire scars increased in size, total fish biomass decreased strongly. Fish communities in unburnt floodplain forests seem to be characterized by a higher proportion of smaller and omnivorous fish species than fish communities in burned floodplain forests and white sand savannas. Fish assemblages in fire scars and white‐sand savanna were not significantly different. Synthesis and Applications. Amazonian fish communities change after floodplain forest fires. Unburnt forests have diverse fish communities, with a large proportion of unique and small omnivorous species. In contrast, carnivores and detritivores become more common in fire scars and white‐sand savannas formed after forest fires. Less omnivore fish after forest fires can reduce tree seed dispersal and forest regeneration, affecting ecosystem functioning and the services provided by Amazonian forests. Fish are also a primary source of food and income for people living in Amazonian floodplains. Preventing forest fires is therefore of fundamental importance for the conservation of Amazonian aquatic and terrestrial ecological communities as well as for the livelihood of people.

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Global proliferation of small hydropower plants – science and policy

Couto

Olden

2018

Frontiers in Ecol & Environ

272

219

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Large‐scale electricity policies that embrace renewable resources have led to continued investments in hydropower. Despite evolving viewpoints regarding the sustainability of large hydropower installations, there has been a major increase in support for the widespread development of small hydropower plants (SHPs). A global synthesis reveals that 82,891 SHPs are operating or are under construction (11 SHPs for every one large hydropower plant) and that this number is estimated to triple if all potential generation capacity were to be developed. Fueled by considerable political and economic incentives in recent decades, the growth of SHPs has greatly outpaced available ecological science. We provide evidence for not only the lack of scientifically informed oversight of SHP development but also the limitations of the capacity‐based regulations currently in use. The potential indiscriminate expansion of SHPs under the pretense of promoting sustainable energy is concerning, and we identify several important steps to help ensure new scientific advances, effective management, and policy reform in the future.

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Presence of riparian vegetation increases biotic condition of fish assemblages in two Brazilian reservoirs

Cited by 4 publications

References 40 publications

Trends in the application of multimetric indexes in Brazil: scienciometric analyses related to fish Fauna

Trends in the application of multimetric indexes in Brazil: scienciometric analyses related to fish Fauna

Fish on Fire: Shifts in Amazonian fish communities after floodplain forest fires

Global proliferation of small hydropower plants – science and policy

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