Ecological uniqueness of fish communities from streams in modified landscapes of Eastern Amazonia

Sousa, Híngara Leão; Siqueira, Tadeu; Torres, Naiara Raiol; Montag, Luciano Fogaça de Assis

doi:10.1016/j.ecolind.2019.106039

Cited by 43 publications

(26 citation statements)

References 83 publications

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“…In CL streams, the greater differences when compared to RIL or UF may be related to the close link between conventional The study streams were located in the Capim River Basin, Pará, in the eastern Amazon of Brazil. The values presented in parentheses in the fourth column (F-to-remove) correspond to the degrees of freedom (df) logging and other types of land use, such as cattle ranching and farming (Leão et al, 2020). These activities tend to expose the riparian vegetation to a greater risk of disturbance, which may also include water diversion for agricultural practices.…”

Section: Discussionmentioning

confidence: 99%

The effect of different logging regimes on the ecomorphological structure of stream fish assemblages in the Brazilian Amazon

et al. 2021

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We evaluated the effects of changes in habitat structure resulting from conventional logging (CL) and reduced-impact logging (RIL) on the ecomorphological structure of stream fish assemblages in the eastern Brazilian Amazon, investigating (1) which habitat characteristics are influenced by different logging methods, (2) the differences in the ecomorphological structure of fish assemblages between two logging methods and undisturbed forest (UF), and (3) the relationships between ecomorphological traits of fish assemblages and habitat variables. We measured 13 habitat variables and characterized 11 ecomorphological traits of 55 fish species collected in 34 sampling sites (stream stretches) located in CL, RIL, and UF. In logged areas, the streams present a fine sediment increase and reduced vegetation cover, while in the UF a greater amount of natural shelter and more cover vegetation were observed. These environmental changes selected ecomorphological traits of stream fish assemblages, recording a greater relative width of the mouth in UF, higher ventral flattening index in RIL, or greater relative head length, and higher caudal peduncle compression index in CL. In this sense, we recommend that logging practices, including RIL, should be reviewed as a means of adopting better strategies to minimize human disturbances in streams.

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Section: Discussionmentioning

confidence: 99%

The effect of different logging regimes on the ecomorphological structure of stream fish assemblages in the Brazilian Amazon

et al. 2021

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“…This, together with the distinct responses of species to environmental conditions, gives rise to an increase in ecosystem stability (insurance effect of biodiversity, Yachi & Loreau, 1999). The studied streams still share several similarities with least or non-disturbed conditions (Juen et al, 2016;Montag et al, 2019;Leão et al, 2020), so an increase in stability could favour the biological communities in face of landscape changes. This is particularly important considering that these streams are inserted in the arc of deforestation, a region subjected to intensive logging where the effects of climatic changes together with land use activities are expected to be severe (Souza et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

How modified landscapes filter rare species and modulate the regional pool of ecological traits?

et al. 2020

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Common and rare species differ in their level of dispersal ability and habitat specialization, and thus should respond to distinct assembly rules. Rare species are much more spatially restricted and usually show higher habitat specialization, so they can be much more vulnerable to landscape changes than common species. We simulated three species-loss scenarios to assess how different groups of stream fish species respond to environmental and spatial variables and how potential extinctions affected regional functional richness and the average functional distinctiveness. Rare and common species contribute similarly to the global functional richness, but the loss of common species led to a marked decrease in local redundancy. Whilst intermediate and rare species are regulated by dispersal, dominant species respond to niche processes and are more affected by land-use changes. Therefore, common and rare species are under distinct assembly rules and may exhibit distinct responses in the face of environmental anthropization. Addressing rare species is often overlooked, despite constant claims regarding their importance and their frequently concerning conservation status. Accounting for their rarity can offer a more refined look at the responses of species to human modifications, providing valuable information on how to tackle biodiversity loss.Keywords Species loss Á Land-use changes Á Dispersal ability Á Environmental filtering Á Extinction Naraiana Loureiro Benone and Bruno Eleres Soares are sharing co-first authorship.

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“…Queiroz et al, 2013;Zuanon et al, 2015), mas também com representatividade em áreas com algum grau de impacto (e.g. Corrêa et al, 2012;Leão et al, 2020).…”

Section: Discussionunclassified

“…Seus resultados, em sua maioria, revelam que os impactos além de provocar a desconfiguração física e estrutural desses ecossistemas, afetam a riqueza de espécies, abundâncias, padrões de dominância, tendência à homogeneização da ictiofauna e o desaparecimento de espécies mais sensíveis. Entre esses estudos de igarapés impactados e/ou degradados na Amazônia: Corrêa et al, 2012, Leal et al, 2017, Lima et al, 2017, Montag et al, 2018, Ilha et al, 2019, Leão et al, 2020Fernandes et al, 2013e Santos et al, 2017Ramalho et al, 2014e Virgílio et al, 2018Anjos & Zuanon, 2007, Beltrão et al, 2018e Costa & Rocha, 2016, Brejão et al, 2018e Costa et al, 2020 Em poucos anos o crescente investimento de esforços para o conhecimento da ictiofauna das bacias da Amazônia Sul Ocidental evidenciou uma das mais ricas ictiofaunas existentes na Amazônia e no mundo. Tal condição foi possível em função de grande esforço amostral realizado na bacia do rio Madeira, incluindo seus grandes e pequenos tributários o que resultou na catalogação de 1.062 espécies de peixes para esta drenagem (Queiroz et al, 2013;Doria et al, 2019), o que equivale a cerca de 40% das 2.716 espécies que vivem em toda hidrografia amazônica (Dagosta & Pinna, 2019).…”

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A ictiofauna de igarapés da microbacia do Belmont, um sistema hidrográfico degradado pela expansão urbana na Amazônia Sul Ocidental

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Ecological uniqueness of fish communities from streams in modified landscapes of Eastern Amazonia

Cited by 43 publications

References 83 publications

The effect of different logging regimes on the ecomorphological structure of stream fish assemblages in the Brazilian Amazon

The effect of different logging regimes on the ecomorphological structure of stream fish assemblages in the Brazilian Amazon

How modified landscapes filter rare species and modulate the regional pool of ecological traits?

A ictiofauna de igarapés da microbacia do Belmont, um sistema hidrográfico degradado pela expansão urbana na Amazônia Sul Ocidental

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