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Article ; Online: Small rivers, great importance: Refuge and growth sites of juvenile migratory fishes in the upper São Francisco Basin, Brazil

Moreira, Marina Ferreira / Peressin, Alexandre / Pompeu, Paulo Santos

Fisheries Management and Ecology. 2023 Feb., v. 30, no. 1 p.1-10

2023

Abstract: Studies of migratory fish species in Neotropical Basins have generally focused on adult fishes, especially on their reproductive migration, whereas sites of growth and refuge of juveniles remain poorly investigated. We aimed to evaluate if smaller rivers ...

Abstract	Studies of migratory fish species in Neotropical Basins have generally focused on adult fishes, especially on their reproductive migration, whereas sites of growth and refuge of juveniles remain poorly investigated. We aimed to evaluate if smaller rivers play a role in the life cycle of these species. We used 13 rivers of different sizes in the upper São Francisco Basin, Brazil. We found that smaller rivers, especially when draining regions close to floodplains, were the first places where juveniles moved after leaving floodplain lakes. We also found that individuals moved downstream as they grew, and were found in increasingly larger rivers that were more distant from floodplains. Currently, the best‐known strategy for conservation of neotropical migratory fishes is the maintenance of free‐flowing stretches encompassing necessary habitats for life cycle completion. We conclude that small tributaries near floodplain regions are also needed in these protected free‐flowing river systems.
Keywords	Neotropics ; administrative management ; adults ; basins ; fish ; floodplains ; juveniles ; migratory behavior ; rivers ; Brazil
Language	English
Dates of publication	2023-02
Size	p. 1-10.
Publishing place	John Wiley & Sons, Ltd
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	1193882-1
ISSN	0969-997X
ISSN	0969-997X
DOI	10.1111/fme.12595
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Food web structure of fish communities of Doce River, 5 years after the Fundão dam failure.

de Carvalho, Débora Reis / Ferreira, Frederico Fernandes / Dergam, Jorge A / Moreira, Marcelo Zacharias / Pompeu, Paulo Santos

Environmental monitoring and assessment

2024 Volume 196, Issue 3, Page(s) 300

Abstract: The rupture of the Fundão dam is considered the largest mining failure in history, which had a particularly detrimental impact on fish populations, as the mud from the ore tailings significantly altered the water quality and habitat of Doce River basin. ... ...

Abstract	The rupture of the Fundão dam is considered the largest mining failure in history, which had a particularly detrimental impact on fish populations, as the mud from the ore tailings significantly altered the water quality and habitat of Doce River basin. This study aimed to assess the trophic structure of fish communities in areas impacted and not impacted by the dam rupture in the Doce River basin. To evaluate the food web structure, community-wide trophic niche, and trophic positions of fish, stable isotopes of carbon (δ
MeSH term(s)	Animals ; Rivers/chemistry ; Food Chain ; Environmental Monitoring ; Water Pollutants, Chemical/analysis ; Fishes
Chemical Substances	Water Pollutants, Chemical
Language	English
Publishing date	2024-02-24
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	782621-7
ISSN	1573-2959 ; 0167-6369
ISSN (online)	1573-2959
ISSN	0167-6369
DOI	10.1007/s10661-024-12395-7
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Article ; Online: Evaluation of River Fragmentation and Implications for the Conservation of Migratory Fish in Southeastern Brazil.

Zambaldi, Ludimilla / Pompeu, Paulo Santos

Environmental management

2020 Volume 65, Issue 5, Page(s) 702–709

Abstract: In freshwater systems, the abundance and diversity of long-distance migratory fish are limited by the maintenance of longitudinal connectivity and natural flow regimes of rivers. Using a graph-based view of each riverscape, we analyzed the river ... ...

Abstract	In freshwater systems, the abundance and diversity of long-distance migratory fish are limited by the maintenance of longitudinal connectivity and natural flow regimes of rivers. Using a graph-based view of each riverscape, we analyzed the river fragmentation process and overlapped with the probable number of migratory species in each remaining stretch. Applying this methodology in basins, we assess historical and potential scenarios quantifying segment extensions free from dams determining the fish richness based on the available habitat for each species. The highest number of migratory species was observed in fragments longer than 100 km. In the future scenario, there was an increase in the number of fragments, with an increase in the number of stretches shorter than 50 km, inadequate to maintain most of the migratory species. Segments of the highest classification order and located in the longest lotic fragments were considered the most important for the species habitat conservation. Dam construction in these segments could seriously affect the ecological processes at a regional level. The proposed analyses enable to approach basins with high diversity of species and nonsalmonid species, supporting the lack of base data concerning those areas, and determine priorities for studies and conservation.
MeSH term(s)	Animals ; Biodiversity ; Brazil ; Conservation of Natural Resources ; Ecosystem ; Fishes ; Rivers
Language	English
Publishing date	2020-02-21
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1478932-2
ISSN	1432-1009 ; 0364-152X
ISSN (online)	1432-1009
ISSN	0364-152X
DOI	10.1007/s00267-020-01266-9
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Evaluation of River Fragmentation and Implications for the Conservation of Migratory Fish in Southeastern Brazil

Zambaldi, Ludimilla / Pompeu, Paulo Santos

Environmental management. 2020 May, v. 65, no. 5

2020

Abstract	In freshwater systems, the abundance and diversity of long-distance migratory fish are limited by the maintenance of longitudinal connectivity and natural flow regimes of rivers. Using a graph-based view of each riverscape, we analyzed the river fragmentation process and overlapped with the probable number of migratory species in each remaining stretch. Applying this methodology in basins, we assess historical and potential scenarios quantifying segment extensions free from dams determining the fish richness based on the available habitat for each species. The highest number of migratory species was observed in fragments longer than 100 km. In the future scenario, there was an increase in the number of fragments, with an increase in the number of stretches shorter than 50 km, inadequate to maintain most of the migratory species. Segments of the highest classification order and located in the longest lotic fragments were considered the most important for the species habitat conservation. Dam construction in these segments could seriously affect the ecological processes at a regional level. The proposed analyses enable to approach basins with high diversity of species and nonsalmonid species, supporting the lack of base data concerning those areas, and determine priorities for studies and conservation.
Keywords	basins ; dams (hydrology) ; fish ; freshwater ; habitat conservation ; habitats ; lotic systems ; migratory behavior ; migratory species ; rivers ; species diversity ; Brazil
Language	English
Dates of publication	2020-05
Size	p. 702-709.
Publishing place	Springer US
Document type	Article
ZDB-ID	1478932-2
ISSN	1432-1009 ; 0364-152X
ISSN (online)	1432-1009
ISSN	0364-152X
DOI	10.1007/s00267-020-01266-9
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: The influence of non-native invertebrate species in the food web structure of two Neotropical reservoirs

Rosa, Daniel Melo / Monteiro, Angelo Barbosa / Faria, Lucas Del Bianco / Pompeu, Paulo Santos

Aquatic Invasions. 2023 June 28, v. 18, no. 2, p. 277-293

2023 , Page(s) 277–293

Abstract: To investigate the influence of non-native aquatic invertebrate species on food web structure, we selected two reservoirs located in the Grande River (upper Paraná River basin, Brazil) with similar fish communities, different age and different taxa ... ...

Abstract	To investigate the influence of non-native aquatic invertebrate species on food web structure, we selected two reservoirs located in the Grande River (upper Paraná River basin, Brazil) with similar fish communities, different age and different taxa introductions history. We quarterly collected fish and benthonic macroinvertebrates samples in the Volta Grande and Funil reservoirs between October 2015 and August 2016. We used conventional methods of diet evaluation to assess the sampled fish and measured the availability of invertebrates (i.e. composition and density) present in the sediment samples from each reservoir. In addition, we performed a structural analysis of trophic interaction networks. Based on the data obtained, it was possible to identify that in Volta Grande most of the energy flow, between benthonic invertebrates (prey) and the fish community (predators), occurred through non-native prey species, especially Limnoperna fortunei and Macrobrachium amazonicum, while in Funil it was shared between non-native and native prey. Species loss simulations indicated that the networks did not differ substantially between random losses and losses between groups. In general, there was a decrease in the probability of occurrence of highly connected species in both reservoirs and between non-native and native species. Results showed that the new interactions among species influenced the importance of the available energy sources for the fish in the Volta Grande reservoir. The presence of non-native prey, especially M. amazonicum, may influence the interaction network structure, promoting community dependence on non-native species to ensure robustness to environmental disturbances. In the absence of pre-invasion data, the comparative study between systems with similar fish communities may provide a better understanding of the impacts caused by the introduction of non-native invertebrate prey.
Keywords	Limnoperna fortunei ; Macrobrachium ; Neotropics ; aquatic invertebrates ; comparative study ; diet ; energy flow ; fish ; fish communities ; food webs ; indigenous species ; introduced species ; macroinvertebrates ; prey species ; probability ; rivers ; sediments ; watersheds ; Brazil ; trophic ecology ; Limnoperna ; predator-prey relationships
Language	English
Dates of publication	2023-0628
Size	p. 277-293
Publishing place	Regional Euro-Asian Biological Invasions Centre
Document type	Article ; Online
ZDB-ID	2381496-2
ISSN	1818-5487
ISSN	1818-5487
DOI	10.3391/ai.2023.18.2.103850
Database	NAL-Catalogue (AGRICOLA)

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Article: Uncertainty in estimating fish trophic positions and food web structure in highly polluted river basins

de Carvalho, Débora Reis / Alves, Carlos Bernardo Mascarenhas / Pompeu, Paulo Santos

Environmental biology of fishes. 2022 Jan., v. 105, no. 1

2022

Abstract: Tributaries greatly influence the supply of organic matter to large rivers. In this study, we used carbon (ẟ¹³C) and nitrogen (ẟ¹⁵N) stable isotopes to assess if organic matter from tributaries with different ¹⁵N compositions influenced the food webs of ... ...

Abstract	Tributaries greatly influence the supply of organic matter to large rivers. In this study, we used carbon (ẟ¹³C) and nitrogen (ẟ¹⁵N) stable isotopes to assess if organic matter from tributaries with different ¹⁵N compositions influenced the food webs of downstream fish assemblages. In addition, we aimed to evaluate if estimates of fish trophic position (TP) are influenced by ¹⁵N-depleted and ¹⁵N-enriched baselines. We compared the food web of a fish assemblage upstream from tributaries (control site), with food webs downstream from ¹⁵N-depleted (site 1) and ¹⁵N-enriched tributaries (site 2). Fishes and resources collected from sites 1 and 2 had significant differences in ẟ¹⁵N composition (¹⁵ N-depleted and ¹⁵N-enriched, respectively) relative to their conspecifics from the control site. At the control site, fish species’ TPs were more reliable and realistic based on their known feeding ecology, with TPs ranging between 2 and 3. In contrast, fish TPs at sites 1 and 2 ranged between 2 and 6, and no consistency was observed among trophic guilds. We conclude that tributaries exert a great influence on fish food webs at downstream sites, either by direct assimilation of organic matter by consumers, or by assimilation of the dissolved inorganic nitrogen by primary producers. In addition, fishes under influence of pollution may exhibit an inaccurate representation of their TP, drawing attention to possible source of bias for TP estimates, and consequently, in the food web structure of nitrogen-polluted areas.
Keywords	carbon ; dissolved inorganic nitrogen ; fish ; food webs ; nitrogen ; organic matter ; pollution ; rivers ; uncertainty
Language	English
Dates of publication	2022-01
Size	p. 119-137.
Publishing place	Springer Netherlands
Document type	Article
ZDB-ID	196790-3
ISSN	1573-5133 ; 0378-1909
ISSN (online)	1573-5133
ISSN	0378-1909
DOI	10.1007/s10641-021-01199-0
Database	NAL-Catalogue (AGRICOLA)

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Article: Drivers of fish assemblage structures in a Neotropical urban watershed

Cruz, Lorenna Campos / Pompeu, Paulo Santos

Urban ecosystems. 2020 Aug., v. 23, no. 4

2020

Abstract: Urbanization results in major changes in stream morphology, hydrology, and water quality; the consequences on fish assemblage of Neotropical urban streams remain poorly understood. Due to the importance of better understanding fish assemblage responses ... ...

Abstract	Urbanization results in major changes in stream morphology, hydrology, and water quality; the consequences on fish assemblage of Neotropical urban streams remain poorly understood. Due to the importance of better understanding fish assemblage responses towards urbanization in biodiversity hotspots, we evaluated the factors structuring the fish assemblages in a Neotropical medium-sized city. Additionally, we evaluated possible differences in fish diversity and biotic homogenization between the urban and control streams. To do so, fish were sampled along with physical habitat and water quality parameters in 16 urban streams in southern Brazil. Multiple regression and distance-based linear models (DistLM) were used to assess the importance of predictor variables in determining species richness and fish assemblage composition, respectively. The fish abundance rank curves were plotted to evaluate graphic differences in fish diversity between urban and control streams, while the relationship between distance and similarity (Bray-Curtis index) was used to evaluate biotic homogenization. The results revealed the importance of variables linking habitat diversity and basin connectivity to fish assemblage richness and structure. In addition, riparian vegetation was the main driver of fish assemblages, explaining 78% of abundance variation. We identified lower diversity and higher biotic homogenization in urban streams, with higher dominance of the non-native species Poecilia reticulata. Our results highlight the importance of evaluating the physical and biotic variables of streams outside of water pollution levels alone. Finally, it is necessary to support urban planning practices that recover riparian vegetation, avoid canalization, and promote connectivity along stream networks as well as the removal of artificial structures in urban basins.
Keywords	Neotropics ; Poecilia reticulata ; basins ; fish ; habitats ; hydrology ; introduced species ; regression analysis ; riparian vegetation ; species richness ; streams ; urbanization ; water pollution ; water quality ; watersheds ; Brazil
Language	English
Dates of publication	2020-08
Size	p. 819-829.
Publishing place	Springer US
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2019257-5
ISSN	1573-1642 ; 1083-8155
ISSN (online)	1573-1642
ISSN	1083-8155
DOI	10.1007/s11252-020-00968-6
Database	NAL-Catalogue (AGRICOLA)

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Article: Representativeness of national parks in protecting freshwater biodiversity: A case of Brazilian savanna

Casarim, Ruanny / Caldeira, Yuri Malta / Pompeu, Paulo Santos

Ecology of freshwater fish. 2020 Oct., v. 29, no. 4

2020

Abstract: The establishment of national parks are an important and often‐used tool to protect biodiversity. However, when considering freshwater ecosystems, many of these areas in Brazil are habitat mosaics in which a small part of the ecosystem is protected and ... ...

Abstract	The establishment of national parks are an important and often‐used tool to protect biodiversity. However, when considering freshwater ecosystems, many of these areas in Brazil are habitat mosaics in which a small part of the ecosystem is protected and strongly influenced by the surrounding environment. By assessing the fish fauna and their diversity patterns in five national parks (NPs) within the Brazilian savanna, we discuss whether the establishment of new NPs or the expansion of their current conservation limits would potentially conserve additional species. We selected all national parks within the third largest drainage area in Brazil. To sample fish communities, we explored 60 streams through a standardised field protocol. We also simulated the potential impact of the enlargement or implementation of a new national park. Our results reinforce the importance of national parks and their surrounding areas to preserve fish species. The enlargement of national parks would result in an increase of potentially protected species; however, the same achievement would be obtained if their buffer zones were effectively managed and protected. We recommend an alternative conservation approach to increase protection of tropical savanna fish biodiversity, especially in developing countries such as Brazil with scarce financial resources available for management, monitoring and creation of protected areas.
Keywords	biodiversity ; conservation areas ; developing countries ; drainage ; fauna ; fish ; fish communities ; freshwater ; freshwater ecosystems ; habitats ; monitoring ; national parks ; protected species ; savannas ; streams ; Brazil
Language	English
Dates of publication	2020-10
Size	p. 705-721.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	913011-1
ISSN	0906-6691
ISSN	0906-6691
DOI	10.1111/eff.12547
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Ecosystem variables importance in the presence and abundance of a globally invasive fish.

Bueno, Marina Lopes / Heringer, Gustavo / de Carvalho, Débora Reis / Robinson, Tamara B / Pompeu, Paulo Santos / Zenni, Rafael Dudeque

The Science of the total environment

2023 Volume 876, Page(s) 162795

Abstract: Changes in physical habitat that are associated with anthropogenic disturbances facilitate the establishment and expansion of non-native species in receiving environments. Here, we evaluated the relative importance of ecosystem variables for the presence ...

Abstract	Changes in physical habitat that are associated with anthropogenic disturbances facilitate the establishment and expansion of non-native species in receiving environments. Here, we evaluated the relative importance of ecosystem variables for the presence and abundance of the invasive fish Poecilia reticulata in Brazil. We collected fish species and assessed environmental variables through an established physical habitat protocol in 220 stream sites located in southeastern and midwestern Brazil. A total of 14,816 P. reticulata individuals were collected in 43 stream sites, and 258 variables that describe the physical characteristics of streams were assessed, including measures of channel morphology, substrate size and type, habitat complexity and cover, riparian vegetation cover and structure, and human influence. Dimensionality reduction methods were employed to limit redundancy, resulting in a smaller set of the most relevant environmental variables. Subsequently, we used random forest models to assess the relative importance of these variables in determining the presence and abundance of P. reticulata. The presence of this invasive fish was primarily explained by human disturbance variables related to urbanization (total impact, pavement, artificial structure areal cover, riparian canopy cover, electrical conductivity, mean thalweg depth, and sand), whereas channel morphology (mean bank full height) and fish cover variables (natural fish cover, and aquatic macrophyte areal cover) were important predictors of its abundance. Identifying which ecosystem variables are favorable to the establishment of non-native species is an important step in preventing future biological invasions, as well as managing those that already occur.
MeSH term(s)	Humans ; Animals ; Ecosystem ; Introduced Species ; Fishes ; Rivers/chemistry ; Brazil ; Poecilia
Language	English
Publishing date	2023-03-11
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.162795
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Article ; Online: Fish assemblage distribution along free-flowing rivers entering a reservoir cascade

Silva-Sene, Andressa Mendes / Loures, Raquel Coelho / de Andrade Neto, Francisco Ricardo / Pompeu, Paulo Santos

Environ Biol Fish. 2022 Nov., v. 105, no. 11 p.1535-1547

2022

Abstract: Reservoir cascades have cumulative effects on fish assemblages that can be less pronounced with the presence of incoming free-flowing tributaries. However, it is still poorly understood how the effects of cascade reservoirs on fish communities are driven. ...

Abstract	Reservoir cascades have cumulative effects on fish assemblages that can be less pronounced with the presence of incoming free-flowing tributaries. However, it is still poorly understood how the effects of cascade reservoirs on fish communities are driven. This study aimed to assess the fish assemblage distribution along two long free-flowing rivers that enter the first two reservoirs in cascade within the upper Grande River basin. Fishes were collected bi-monthly throughout 1 year along this cascade and were evaluated by composition and richness of native and non-native species. The transitional areas between the rivers and the first reservoir presented the highest richness. An increase of non-native species was observed from the uppermost (Rivers) to the downmost (lower reservoir) region. Although the seasonality did not influence fish composition in the Camargos-Itutinga cascade system, discharge-related variables (water level, transparency, and temperature), together with the position along the gradient, were the main drivers of the variation on fish assemblage’s structure. The results reinforce the role of cascade systems in the increase of non-native species, as well as the importance of free-flowing rivers in structuring the fish fauna in such conditions.
Keywords	fauna ; fish ; introduced species ; temperature ; watersheds
Language	English
Dates of publication	2022-11
Size	p. 1535-1547.
Publishing place	Springer Netherlands
Document type	Article ; Online
ZDB-ID	196790-3
ISSN	1573-5133 ; 0378-1909
ISSN (online)	1573-5133
ISSN	0378-1909
DOI	10.1007/s10641-022-01345-2
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