Landscape variables influence taxonomic and trait composition of insect assemblages in Neotropical savanna streams

Castro, Diego Marcel Parreira de; Dolédec, Sylvain; Callisto, Marcos

doi:10.1111/fwb.12961

Cited by 35 publications

(19 citation statements)

References 84 publications

(132 reference statements)

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“…Local and regional factors regulate the biodiversity of stream ecosystems by filtering organisms based on their attributes (Poff, ). Environmental factors, such as rainfall, altitude (regional scale) and flow types, heterogeneity and substrate types (local scale), for example, are known as key components structuring aquatic invertebrate distribution and abundance in streams (Castro, Dolédec & Callisto, ; Heino, Muotka & Paavola, ; Silva, Ligeiro, Hughes & Callisto, ). However, the main drivers of their community assembly along tropical altitudinal gradients remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Beta diversity of aquatic invertebrates increases along an altitudinal gradient in a Neotropical mountain

et al. 2019

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Mountains harbor rich biodiversity and high levels of endemism, particularly due to changes in environmental conditions over short spatial distances, which affects species distribution and composition. Studies on mountain ecosystems are increasingly needed, as mountains are highly threatened despite providing ecosystem services, such as water supply for half of the human population. We aimed to understand the patterns and drivers of alpha and beta diversities of aquatic invertebrates in headwater streams along an altitudinal gradient in the second largest South American mountain range, the Espinhaço mountains. Headwater streams were selected at each 100 m of elevation along an altitudinal gradient ranging from 800 to 1400 m asl, where three substrate types per stream were sampled: leaf litter, gravel, and cobbles. Environmental variables were sampled to represent local riparian canopy cover, instream physical habitat, water quality, climatic data, and land use. Generalized linear models and mixed models were used to test relationships between altitude and the richness and abundance of invertebrates and to assess the influence of environmental variables on the same metrics. Patterns of spatial variation in aquatic invertebrate assemblages along the altitudinal gradient were assessed using multiplicative beta diversity partitioning.The richness and abundance of aquatic invertebrates decreased with increasing altitude, whereas beta diversity increased with increasing altitude. Significant differences in assemblage composition and in relative abundance of invertebrates were observed for both substrates and altitude. We thus show that the high regional beta diversity in aquatic ecosystems in the studied site is due to the high turnover among areas.Abstract in Portuguese is available with online material. K E Y W O R D Saquatic ecosystems, elevation, macroinvertebrate assemblages, mountain ecology, rupestrian grassland, species distribution

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Section: Introductionmentioning

confidence: 99%

Beta diversity of aquatic invertebrates increases along an altitudinal gradient in a Neotropical mountain

et al. 2019

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“…Lower streambed stability values suggest that there are ongoing landscape or channel erosion processes (Kaufmann et al, 2009). Other studies have found that this process is intensified by reduced vegetation cover resulting from agricultural activities (de Castro, Dolédec, & Callisto, 2017;Leal et al, 2018;Leitão et al, 2018).…”

Section: Resultsmentioning

confidence: 98%

Major risks to aquatic biotic condition in a Neotropical Savanna River basin

Martins

Macedo

Hughes

et al. 2021

River Research & Apps

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Conditions in freshwater ecosystems are responsible for maintaining biodiversity and other ecosystem services. Identifying and understanding how anthropogenic disturbances affect biotic conditions are important steps in rehabilitating and protecting environmental quality. The relative risk, relative extent, and attributable risk approaches are used to determine ecosystem conditions in ecological monitoring programs conducted across large spatial extents. Our study was conducted in the Pandeiros River basin, which is a protected area in Minas Gerais, Brazil, that contains 233 km of mapped streams that were perennial and accessible. Field sampling was conducted in the dry period (April and June 2016) at 40 randomly selected sites. Ten multimetric indices (MMIs), previously determined to be sensitive in this river basin, were calculated. All the physical habitat disturbance metrics were significantly correlated with the MMIs. The risk of finding poor MMI scores was 1.6-1.7 times higher at sites with a high integrated disturbance index (IDI) or local disturbance index (LDI) score. Pasture was the most extensive disturbance, affecting 40.8% of the stream length, followed by 40.1% for low bed stability, 29% for fine substrates (<16 mm), 24.4% for high IDI scores, and 21.7% for high LDI scores. This is useful to know for five reasons: ( 1) standardized MMIs can assess environmental quality. (2) MMIs clarify that both catchment and local disturbances may represent serious risks to aquatic assemblages. (3) MMIs indicate which disturbances represent the most risk by comparing MMI scores against disturbance scores. (4) MMI risk assessments facilitate choosing the most appropriate mitigation actions. (5) Our results suggest environmental conservation actions for similar river basins.

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“…Tabela 2 -Exemplos de atributos funcionais de macroinvertebrados bentônicos (adaptado de Castro et al 2017).…”

Section: -Atributos Biológicos E Ecológicosunclassified

Abordagens Ecológicas

Castro¹,

Callisto²,

Linares³

et al. 2019

Bases Conceituais Para Conservação E Manejo De Bacias Hidrográficas

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Landscape variables influence taxonomic and trait composition of insect assemblages in Neotropical savanna streams

Cited by 35 publications

References 84 publications

Beta diversity of aquatic invertebrates increases along an altitudinal gradient in a Neotropical mountain

Beta diversity of aquatic invertebrates increases along an altitudinal gradient in a Neotropical mountain

Major risks to aquatic biotic condition in a Neotropical Savanna River basin

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