Functional diversity and functional traits of periphytic algae during a short-term successional process in a Neotropical floodplain lake

Dunck, Bárbara; Rodrigues, Liliana; Dc, Bicudo

doi:10.1590/1519-6984.17813

Cited by 18 publications

(6 citation statements)

References 39 publications

(61 reference statements)

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“…In these ecosystems, seasons had a less pronounced effect, and the related hydrological cycle, as well as the substrate type, had no significant effect on functional diversity, in contrast to the case of freshwater, where high water periods support the appearance of a number of periphytic algal species with different traits, thus resulting in a high degree of functional diversity (Dunck, Algarte, Cianciaruso, & Rodrigues, ; Dunck, Rodrigues, & Bicudo, ). At the taxonomic level, seasonal effects (Lengyel et al, ) can also be detected in the benthic diatom, as well as in the planktic communities of saline lakes (Alfonso et al, ).…”

Section: Discussionmentioning

confidence: 99%

Trait‐based diatom functional diversity as an appropriate tool for understanding the effects of environmental changes in soda pans

Stenger‐Kovács

Lengyel

Buczkó

et al. 2019

Ecology and Evolution

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Saline lakes, among the most seriously endangered ecosystems, are threatened due to climate change and human activities. One valuable feature of these environments is that they constitute areas of high biodiversity. Ecologists are, therefore, under great pressure to improve their understanding of the effects of natural and anthropogenic disturbances on the biodiversity of saline lakes. In this study, a total of 257 samples from 32 soda pans in Central Europe between 2006 and 2015 were examined. The effects of environmental variables and of geographical and limnoecological factors on functional diversity were analyzed. Furthermore, the explanatory power of the trait-based approach was assessed, and the applicability of the indices for biomonitoring purposes was determined. It was found that low habitat heterogeneity and harsh environments lead to the selection of a small number of suitable traits, and consequently, to a naturally low level of functional diversity. Anthropogenic activities enhance diversity at functional level due to the shift toward freshwater characteristics. On the regional scale, the effects of the region and status (natural, degraded, reconstructed) on diatom functional diversity were significant and more pronounced than that of the environmental and other limnoecological factors. The degree of variance found in functional diversity ascribed to environmental variables is five times greater in the case of the application of a trait-based approach, than when a taxonomic one is employed in the literature. Each of the tested functional diversity indices was sensitive to the most important environmental variables. Furthermore, these were type-specific and proved to be more complex indicators than taxonomic metrics. It is possible to suggest four functional diversity indices (FGR, FRic, FDis, and FDiv) which emphasize their independence from substrate and seasonal variations for ecological status assessment and conservation planning. K E Y W O R D Sconservation, diversity indices, ecological status, environmental constrains, saline ecosystems | 321 STENGER-KOVÁCS ET al.

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Section: Discussionmentioning

confidence: 99%

Trait‐based diatom functional diversity as an appropriate tool for understanding the effects of environmental changes in soda pans

Stenger‐Kovács

Lengyel

Buczkó

et al. 2019

Ecology and Evolution

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“…Col colonial, Fil filamentous, Uni unicellular, Dcb differentiated basal cell, Ent entangled, Het heterotrichous, Mob mobile, Sta stalked, Mup mucilaginous pad, Pro prostrate, Mut mucilage tubes, (1) Garças Lake, (2) Baía River, (3) Xirica Lake, (4) Ivinhema River, (5) Ivinhema River (medium), (6) Ivinhema Lake, (7) Ivinhema River (bass), (8) Amambaí River, (9) Paraná River 1, (10) Paraná River 2, (11) Iguatemi River, (12) Paraná River 3 Species complex A. minutissimum and E. incisa are the only organisms present in all sampling sites. A. minutissimum is among the most registered diatoms in the world and may occur in acid or alkaline environments, and in oligotrophic to eutrophic environments (Round 2004;Dunck et al 2015b;Bichoff et al 2016). Eunotia incisa is common in acid habitats, with great variation in conductivity values (Ortiz-Lerín and Cambra 2007); however, in this study, it was found in oligotrophic to mesotrophic environments.…”

Section: Discussionmentioning

confidence: 52%

Trait structure and functional diversity of periphytic algae in a floodplain conservation area

et al. 2018

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We aimed to evaluate the structure of periphytic algae communities, the trait distribution and the patterns of functional diversity in the last non-dammed stretch of the Upper Paraná River floodplain. We hypothesize that there is an increase in the functional diversity and a change of the traits and environmental variables structure along this floodplain. We expected an increase in the functional diversity due to the increase in tributaries propagule input leading to a functional divergence, provided by deterministic processes. The sampling was in channels, lakes and rivers in a floodplain area covering 230 km of extension of the main river. The periphyton was obtained from scraping petioles of the floating macrophyte Eichhornia azurea (Sw.) Kunth. The traits evaluated were life form and strength and form of adherence to the substrate. The functional diversity was calculated from a functional dendrogram and assembly rules. The hypotheses proposed in this study were partially accepted, since there was no increase in functional diversity along the sampled area, but we observed a change in the structure of the functional traits along the different stretches of the floodplain. The results showed diatoms as the dominant algae, and functional convergence as the assembly rule prevalent for this community. There was a large difference between local environmental factors along the floodplain. The protected areas housed the greatest functional diversity values, which was apparently influenced by the increase in functional diversity, which can be explained by the limnological factors and the input of propagules from the tributaries to the Paraná River. We noted the importance of the protected areas and local factors for assembly of this community.

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“…Algae are used to assess the quality of the environment (Sabater et al., 2007), especially diatoms due to their sensitivity to many environmental factors (Gómez and Licursi, 2001; Zampella et al., 2006; Seeligmann et al., 2008; Dunck et al., 2015). Fluoride has unfavorable effects for algae because it interacts negatively on photosynthesis, respiration, pigment synthesis, among other biological systems (Bhatnagar, 1997), causing chlorosis, necrosis, and morphological abnormalities in algae and aquatic plants (McPherson et al., 2014).…”

Section: Discussionmentioning

confidence: 99%

Anuran tadpoles inhabiting a fluoride-rich stream: diets and morphological indicators

Pollo

Cibils‐Martina

Otero

et al. 2019

Heliyon

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We in situ assessed the influence of natural fluoride concentrations in lotic freshwater ecosystems on diet and morphology of Boana cordobae tadpoles. Two streams were sampled in Argentina: Los Vallecitos stream (LF-LV) and Los Cerros Negros stream (HF-CN) with low and high fluoride levels, respectively. We captured tadpoles of B. cordobae in each stream using nets. Body weight (BW), total length (TL) and body condition (BC) of tadpoles was registered. Food items were identified to genus level and assigned to functional traits. Tadpoles showed significant differences in TL between streams, with smaller individuals in HF-CN, while did not show differences in BW and BC. The diet of tadpoles consisted mostly of microalgae. In tadpoles from HF-CN stream the proportion of cyanobacteria was lower than tadpoles from LF-LV. In relation to functional traits, small algae, high profile and colonial algae were more abundant in HF-CN. Algae attached by pads showed a higher proportion in HF-CN diets and stalked algae were more abundant in LF-LV. The differences in TL and diet of tadpoles can be attributed to differences in algal community composition, with genera that are affected by high concentrations of natural fluoride; for example cyanobacteria. The low algal richness registered in HF-CN stream does not affect the physiological state of the tadpoles, possibly because of a higher algal density in HF-CN diets. However, in further studies it would be important to evaluate the population status of B. cordobae from the HF-CN, because a small body length of tadpoles could have consequences at the population level.

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Functional diversity and functional traits of periphytic algae during a short-term successional process in a Neotropical floodplain lake

Cited by 18 publications

References 39 publications

Trait‐based diatom functional diversity as an appropriate tool for understanding the effects of environmental changes in soda pans

Trait‐based diatom functional diversity as an appropriate tool for understanding the effects of environmental changes in soda pans

Trait structure and functional diversity of periphytic algae in a floodplain conservation area

Anuran tadpoles inhabiting a fluoride-rich stream: diets and morphological indicators

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