Escalas Espaciais e Comunidades Aquáticas

Macedo, Diego Rodrigues; Callisto, Marcos; Castro, Diego Marcel Parreira de; Silva, Déborah Regina Oliveira; Carvalho, Débora Reis de; Santos, Gilmar B.; Becker, Barbara J.; Sanches, Bárbara; Alves, Carlos Bernardo Mascarenhas

doi:10.17648/bacias-hidrograficas-2

Cited by 2 publications

(2 citation statements)

References 80 publications

(113 reference statements)

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“…We sampled 97 wadeable stream sites in the Cerrado biome of southeastern Brazil. The sites were defined at a 1:100 000 scale, and selected via a spatially dispersed random survey design (Macedo et al, 2019;Macedo et al, 2014). The sites occurred in five hydrological units, defined as drainage areas within 35 km upstream of each of the hydropower reservoirs of Três Marias, Volta Grande, São Simão, Nova Ponte, and Pandeiros (Fig.…”

Section: Methodology Study Areamentioning

confidence: 99%

The past is never dead: legacy effects alter the structure of benthic macroinvertebrate assemblages

Linares¹,

Macedo²,

Hughes³

et al. 2023

Limnetica

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Land use is the most common and widespread threat to lotic ecosystem health and freshwater biodiversity conservation. The legacy effects of past anthropogenic land use and cover may also affect the structure and functioning of current lotic ecosys¬tems. Therefore, the aim of this study was to use benthic macroinvertebrate assemblages to evaluate the potential legacy effects of anthropogenic land use on headwater streams in the Neotropical Savanna. We tested three hypotheses. (1) The legacy effects on macroinvertebrates of the riparian zone are more important than those of the entire catchment. (2) Recent deforestation has a stronger effect on the current taxonomic structure of benthic macroinvertebrate assemblages than historical deforestation. (3) Sen-sitive taxa respond more readily than tolerant taxa to historical deforestation. To test these hypotheses, we estimated deforestation over the last 30 years for 97 stream sites in 5 hydrological units and tested it against benthic macroinvertebrate abundance, taxa richness, EPT abundance, EPT richness, Shannon-Wiener diversity, and Simpson diversity. The two first hypotheses were cor¬roborated, as Shannon-Wiener and Simpson diversity indices were significantly correlated with deforestation in the riparian zone (p < 0.05) and these diversity variables were positively correlated with older deforestation, meaning that such sites tended to recover their diversity over time after a deforestation event. The third hypothesis was only partially supported because EPT (sensitive taxa) did not represent most taxa with significant correlations with historical deforestation at catchment scale, but were the only taxa to do so at the 200 m riparian buffer. We conclude that recent deforestation has more significant effects, but past deforestation still plays a significant role in the structure and functioning of lotic ecosystems.

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Section: Methodology Study Areamentioning

confidence: 99%

The past is never dead: legacy effects alter the structure of benthic macroinvertebrate assemblages

Linares¹,

Macedo²,

Hughes³

et al. 2023

Limnetica

Self Cite

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“…A ecologia de paisagens tem muito a contribuir nos dois casos, ao lidar primariamente com escalas espaciais e temporais e por oferecer diversas ferramentas para o desenvolvimento de abordagens ecológicas inovadoras. A partir da ecologia de paisagens podemos avaliar padrões espaciais de distribuição da biodiversidade e da disponibilidade de recursos, considerar abordagens espaciais em múltiplas escalas hierárquicas, estimar fragmentação e perda de habitat e também propor diretrizes para o planejamento ambiental em escala de paisagem (Macedo et al 2019) e para a escolha de áreas prioritárias para a conservação da biodiversidade (ver Frederico et al 2021).…”

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A Ecologia De Peixes De Riacho Sob a Perspectiva Da Ecologia De Paisagens

2021

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Landscape ecology emphasizes the interaction between spatial patterns and ecological processes, i.e., the consequences of spatial heterogeneity across various scales. It is an interdisciplinary science that seeks to understand the relationships between ecological patterns and processes considering different spatial and temporal scales. This understanding has been supported by the rapid development of a methodological framework, largely based on Geographic Information Systems (GIS). Thus, it has allowed understanding how ecological processes are affected by anthropogenic activities that trigger profound changes in ecosystems, such as habitat loss and fragmentation. Although commonly applied to studies in terrestrial ecosystems, there is a time lag in both theoretical development and methodological adaptation of landscape ecology applied to studies in streams, especially in Brazil. Methodological adaptations are necessary considering the particularities of aquatic environments in relation to terrestrial ones. For example, streams have a hierarchical spatial organization that results in local conditions dependent on the regional context. In fact, streams are connected to the landscape in which they are inserted through multiple spatial and temporal scales. This hydrologic connectivity, and the low ratio/proportion of aquatic/terrestrial areas, in turn results in anthropogenic impacts accumulating along the hydrographic networks. Considering the above, the objectives of this chapter are: (1) Introduce the general concepts of landscape ecology; (2) Present the main methods of spatial data acquisition and management relevant to stream approaches; (3) Describe the spatial and temporal scales relevant to stream ecology and (4) Discuss the potential of landscape ecology to assess human impacts on streams. Landscape ecology has much to offer to the study of stream fish in Brazil and has shown to be a promising approach for advancing this frontier of knowledge.

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Escalas Espaciais e Comunidades Aquáticas

Cited by 2 publications

References 80 publications

The past is never dead: legacy effects alter the structure of benthic macroinvertebrate assemblages

The past is never dead: legacy effects alter the structure of benthic macroinvertebrate assemblages

A Ecologia De Peixes De Riacho Sob a Perspectiva Da Ecologia De Paisagens

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