Microhabitat patterns of soft-bodied benthic algae in a lowland river largely fed by groundwater

Bolpagni, Rossano; Laini, Alex

doi:10.5507/fot.2016.007

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…However, the influence of NO 3 − on macroinvertebrate community composition is especially evident at sites further away from Lake Iseo (e.g., site 3, Table 4) as previously demonstrated by Laini et al [36]. Groundwater inputs have been reported to support macrophyte assemblages in the same system by providing habitat heterogeneity [8,78], these may in turn indirectly affect macroinvertebrate community structure [79]. According to Bonada et al [80], following Dufrêne and Legendre [49], IV ≥ 0.5 (in case of "indicespecies" package approach) can be considered as a threshold to judge adequate an indicator taxon.…”

Section: Differences In the Similarity: Cross-site Comparisonsupporting

confidence: 57%

Taxonomic and Functional Responses of Benthic Macroinvertebrate Communities to Hydrological and Water Quality Variations in a Heavily Regulated River

Laini

Viaroli

Bolpagni

et al. 2019

Water

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Aquatic macroinvertebrates are frequently used to evaluate river system conditions and restoration project performance. A better understanding of macroinvertebrate community responses to multiple stressors is a primary challenge for river science. In this paper, macroinvertebrate responses to hydrological and water quality variability were studied in the regulated Oglio River (northern Italy). We hypothesized that in regulated rivers the hydrological, rather than the physico-chemical conditions, would affect macroinvertebrate communities and biomonitoring tools (taxonomic metrics and functional indices). Repeated sampling (six times a year) was performed at four sites downstream of four dams in a 30 km river stretch during 2014 and 2015. Data were analysed using a linear mixed effect framework, to take into account random variation due to site and sampling date, and with multivariate analysis to track changes in community structure. A total of 69 families and 134,693 organisms were identified. The investigated metrics were mainly affected by the coefficient of variation of discharge, minimum discharge, ammonium, and temperature. The short-term dynamics of hydrological and physico-chemical variables were generally less important than the overall random effects as drivers of macroinvertebrate-based metrics. However, the relevance of a random effect (site, time, their interaction) differed depending on the biological metrics analysed. Understanding potential differences in response to short term and short stretch conditions would benefit biomonitoring and restoration procedures in both regulated and natural rivers.

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Section: Differences In the Similarity: Cross-site Comparisonsupporting

confidence: 57%

Taxonomic and Functional Responses of Benthic Macroinvertebrate Communities to Hydrological and Water Quality Variations in a Heavily Regulated River

Laini

Viaroli

Bolpagni

et al. 2019

Water

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“…In fact, several authors pointed out high levels of lateral variation in taxa diversity and community structure for braided systems (e.g., Arscott et al, 2005;Gray and Harding, 2007, respectively in north-eastern Italy and New Zealand). Similar outputs were also recorded for primary producers in lowland rivers largely fed by groundwater (Bolpagni and Laini, 2016), suggesting the existence of complex metabolic gradients across habitats in hydro-systems.…”

Section: Introductionsupporting

confidence: 63%

Mesohabitat mosaic in lowland braided rivers: Short-term variability of macroinvertebrate metacommunities

et al. 2017

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Braided rivers are among the most variable and dynamic riverine systems. Changes in these environments are sudden and frequent, driven by the high hydrological variability. They host high levels of local heterogeneity, with many different habitats in close proximity establishing a mosaic of patches. This provides the conditions for high levels of biodiversity, with strong community variability in particular among the different habitats at the stream-reach level. Nevertheless, these systems are still poorly studied and their complexity is often not taken into account in biomonitoring protocols. We applied mixed effects modelling, spatial ordination techniques and beta-diversity partitioning (into nestedness and turnover components) with the aim of improving the knowledge of braided rivers, investigating: i) the organization of macroinvertebrate communities among the different habitats of a river reach, and ii) the temporal variability of this organization (both among seasons and during summer). We predicted a differentiation of macroinvertebrate communities between distinct habitats within rivers, with this differentiation increasing during the low-flow period. We carried out our study in four braided rivers and streams of the Po River basin (Northern Italy) sampling three different kinds of mesohabitats (main channel, secondary channel and pool) in eight stations during seven campaigns from June 2015 to April 2016. We found a high variability of taxa richness, abundance and community structure among mesohabitats, with marginal ones accounting for the greater part of macroinvertebrate diversity. Secondary channels resulted as being the habitat hosting greater taxa diversity, with 10 exclusive taxa. Surprisingly the mesohabitat communities differed greatly during the seasonal phase, whereas their dissimilarity decreased during summer. This could be explained considering the summer flow reduction as a homogenizing force, leading to a general loss of the most sensitive taxa. However, the summer taxa turnover value resulted higher than nestedness, suggesting a strong environmental control on community organization, with taxa well adapted to the different conditions of mesohabitats and able to manage the effects of flow reduction. Our work represents a remarkable issue for biomonitoring protocols, highlighting the importance of taking into account the whole complexity of braided rivers for a more realistic evaluation of macroinvertebrate communities.

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“…Following the river continuum concept (Vannote et al, 1980) and the serial discontinuity concept proposed by Ward and Stanford (1983), a large body of literature has outlined the contribution of river fragmentation to fish population dynamics and population viability as well as to macroinvertebrate community patterns (Guareschi et al, 2014;Peacock et al, 2016). The relationships between river primary producers and riverbed features, such as damming, have instead received a limited amount of attention, especially in lowland, highly modified, rivers (Benítez-Mora and Camargo, 2014;Ceschin et al, 2015;Bolpagni et al, 2015;Bolpagni and Laini, 2016).…”

Section: Introductionmentioning

confidence: 99%

Fragmentation and groundwater supply as major drivers of algal and plant diversity and relative cover dynamics along a highly modified lowland river

Bolpagni

Racchetti

Laini

2016

Science of The Total Environment

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Microhabitat patterns of soft-bodied benthic algae in a lowland river largely fed by groundwater

Cited by 7 publications

References 32 publications

Taxonomic and Functional Responses of Benthic Macroinvertebrate Communities to Hydrological and Water Quality Variations in a Heavily Regulated River

Taxonomic and Functional Responses of Benthic Macroinvertebrate Communities to Hydrological and Water Quality Variations in a Heavily Regulated River

Mesohabitat mosaic in lowland braided rivers: Short-term variability of macroinvertebrate metacommunities

Fragmentation and groundwater supply as major drivers of algal and plant diversity and relative cover dynamics along a highly modified lowland river

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