Community stability and seasonal biotic homogenisation emphasize the effect of the invasive tropical tanner grass on macrophytes from a highly dynamic neotropical tidal river

Galvanese, Elena Fukasawa; Costa, Ana Paula Lula; Araújo, Elielton Silva; Falkievicz, Bruno Cesar; Melo, Gabriel Garcia Valente de; Vitule, Jean Ricardo Simões; Padial, André Andrian

doi:10.1007/s00027-022-00858-3

Cited by 9 publications

(15 citation statements)

References 79 publications

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“…Unfortunately, due to logistic and financial constraints, we were not able to measure abiotic variable to better define the environmental gradient of Guaraguaçu River (see description of sampling below). Even so, evidence for the strong gradient abovementioned was already described by the high spatial turnover of aquatic macrophyte community (Galvanese et al, 2022).…”

Section: Study Sitementioning

confidence: 96%

“…The Guaraguaçu River (25° 37' 36.4'' S, 48° 30' 29.2'' W, Fig. 1) is a subtropical river with strong tidal influence and strong ecological variation from upstream to downstream (see also Vitule et al, 2006;Araújo et al, 2021;Galvanese et al, 2022). The Guaraguaçu River is the largest river of the Paraná State coastal basin in South Brazil.…”

Section: Study Sitementioning

confidence: 99%

“…The environmental gradient is strong considering changes from areas near headwater streams and mangroves. Sampling occurred in 16 sampling sites located along all navigable stretch of the river (Galvanese et al, 2022, see Fig. 1 for location and coordinates).…”

Section: Study Sitementioning

confidence: 99%

“…As said, aforementioned, environmental data was not sampled in this long-term monitoring given logistic and financial restrictions, particularly the lack of equipment and support in Brazilian research centers. Even so, data on aquatic macrophytes are available and demonstrate great turnover along the 16 sampling sites (Galvanese et al, 2022). Indeed, the locations sampling sites were chosen following an adaptation of the RAPELD protocol for long-term monitoring (Magnusson et al, 2005), and were selected to represent meaningful ecological gradients (Galvanese et al, 2022).…”

Section: Samplings and Data Analysesmentioning

confidence: 99%

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Temporal stability in beta diversity does not guarantee surrogacy or compositional stability in a micro-phytoplankton metacommunity

Sampaio¹,

Ferreira²,

Ludwig³

et al. 2023

Limnetica

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Temporal stability in beta diversity does not guarantee surrogacy or compositional stability in a micro-phytoplankton meta¬community. In this study, we evaluated phytoplankton community organization (i.e., microalgae filtered in 20 μm mesh-sized plankton net) in a highly dynamic subtropical tidal river over three years. Specifically, we assessed temporal stability in the spatial organization of phytoplankton, the diatoms’ efficiency as an indicator (surrogate group) of ecological patterns of other phytoplankton groups, the temporal variation in species composition, and the beta diversity of a metacommunity. We performed six sampling occasions at the end of the summers and winters from 2017 to 2019 at 16 sampling points comprising a strong en¬vironmental gradient in the Guaraguaçu River, South Brazil. We tested for correlations of community structures from different periods and for correlations between diatoms species and those from other phytoplankton groups using Mantel tests. Species compositions were compared among periods using a permutational multivariate analysis of variance, and temporal variation in metacommunity beta diversity was evaluated using null models. There was temporal stability in the spatial dissimilarities of communities. Diatoms were poorly correlated with the other phytoplankton groups. The temporal stability in spatial structure, a facet of beta diversity, was in line with the temporal stability in compositional variation – a measurement of metacommuni¬ty beta diversity. Our results also showed that such stability was not static, since community compositions varied over time, mainly between seasons. We conclude that even in a highly dynamic tidal river, the temporal stability of spatial organization may indicate that the spatial gradient is so strong that it maintains spatial structuring over time. Such patterns were maintained even with the dynamic species changes over seasons. The fact that different phytoplankton groups do not respond similarly to the spatial gradient reinforces that microalgae should be analyzed separately in ecological studies, and long-term monitoring should consider different algal groups for a complete assessment of ecological patterns.

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Section: Study Sitementioning

confidence: 96%

Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Samplings and Data Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Temporal stability in beta diversity does not guarantee surrogacy or compositional stability in a micro-phytoplankton metacommunity

Sampaio¹,

Ferreira²,

Ludwig³

et al. 2023

Limnetica

Self Cite

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“…Representatives of this genus (including U. arrecta) have been responsible for negative impacts such as the reduction of the diversity of aquatic communities, replacement of native ora, increase of biotic homogenization and the blocking of canals, bridges, and water intake ducts for hydroelectric power plants (Carniatto et al 2013;Amorim et al 2015;Latini et al 2016;Galvanese et al 2022). Furthermore, U. arrecta has high plasticity and can grow as an epiphytic life form on drifting oating macrophyte mats, which enhances its dispersion and potential impacts (Michelan et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Low genetic diversity in an African invasive Poaceae in Brazil

Scorsim

Diamante

Fabrin

et al. 2022

Preprint

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Poaceae has numerous species that are highly invasive thorough the planet. Urochloa, native to Africa, stands out in terms of invasion and impacts in South America. However, the correct identification of the species included in this genus is complex due to their morphological similarity with other species and there is a lack of studies involving the genetic variability of some species in Brazil, which is important for understanding the invasion mechanisms and planning control measures. In this study, we evaluated the genetic variability of the invasive exotic Poaceae Urochloa arrecta in different Brazilian regions, by using the nuclear marker ITS and the chloroplast marker trnL-trnF. The sequences obtained were compared with those available in GenBank (NCBI). The results indicated a low genetic differentiation among the sampled populations. Seven and ten distinct haplotypes were identified for ITS and trnL-trnF, respectively, and most specimens shared a single haplotype. These results indicate that a limited number of propagules were introduced in the invasive range and/or that this species reproduces mainly through asexual reproduction. This last possibility is suggested by the great regeneration and colonization rates of asexual propagules of this species. The data obtained are useful for understanding the invasion mechanisms of the group in the region.

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Urochloa arrecta: an African invasive Poaceae in Brazil with low genetic diversity

et al. 2022

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Community stability and seasonal biotic homogenisation emphasize the effect of the invasive tropical tanner grass on macrophytes from a highly dynamic neotropical tidal river

Cited by 9 publications

References 79 publications

Temporal stability in beta diversity does not guarantee surrogacy or compositional stability in a micro-phytoplankton metacommunity

Temporal stability in beta diversity does not guarantee surrogacy or compositional stability in a micro-phytoplankton metacommunity

Low genetic diversity in an African invasive Poaceae in Brazil

Urochloa arrecta: an African invasive Poaceae in Brazil with low genetic diversity

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