Reservoirs override seasonal variability of phytoplankton communities in a regulated Mediterranean river

Tornés, Elisabet; Pérez, M.C.; Durán, Concha; Sabater, Sergi

doi:10.1016/j.scitotenv.2013.04.086

Cited by 30 publications

(23 citation statements)

References 63 publications

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“…It is important to note that in this study, the taxon list for each site encompassed two samplings, under both high-and low-flow conditions. We therefore propose that along with high-and low-flow conditions, being a major factor determining algal local communities in Mediterranean streams (as suggested by Torn es & Sabater, 2010), that hydrological variability of each site (i.e. regardless of the flow conditions at the moment of sampling) is a factor determining local algal communities.…”

Section: Causes Of Nestedness In Benthic Diatom Meta-communitiesmentioning

confidence: 85%

“…Contrasting flow periods (high‐flow and low‐flow waters) are also expected to become even more pronounced (Giorgi & Lionello, ). Increases in the frequency and severity of floods and droughts have already been described to affect the physical, chemical and biological properties of freshwater systems negatively and accompany other changes related to human pressure (Sabater & Tockner, ; Timoner et al ., ; Tornés et al ., ). Our results imply that idiosyncratic diatom species are likely to be favoured by future global change in Mediterranean rivers and streams.…”

Section: Discussionmentioning

confidence: 97%

“…As a result, headwater and middle-order streams often become intermittent or have intermittent reaches (Lake, 2003), or have areas of reaches that are dry for extended periods (Sabater & Tockner, 2010). Intermittency influences the survival and performance of stream biota (Boulton, 2003;Datry, Arscott & Sabater, 2011) and controls the effects of small-scale heterogeneity (Torn es & Sabater, 2010). Specifically, droughts are known to have a profound impact on the densities and size-or age-structure of populations, on community composition and diversity, and on ecosystem processes (Lake, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Flow intermittency decreases nestedness and specialisation of diatom communities in Mediterranean rivers

Tornés

Ruhí

2013

Freshwater Biology

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1. Due to their ubiquity and highly efficient passive dispersal, benthic diatoms are an ideal group in which to explore the drivers of community spatial structure and the ultimate links between such patterns and species autoecology. However, studies addressing these issues have largely overlooked unicellular taxa to date. 2. We examined the spatial order (i.e. nestedness) of a diatom meta-community of 122 lotic sites in the north-east Iberian Peninsula and the relationship between the contributions of individual species to nestedness and their niche breadths [measured using outlying mean index (OMI) analyses]. 3. We observed a significantly nested pattern in the meta-community (T = 14.05, NODF = 22.57), although idiosyncratic species accounted for a substantial fraction (34%) of the global species pool. Hydrological stability was identified as the main driver of nestedness. Highly stable, moderately stable and intermittent sites differed in nestedness and in alpha diversity, with intermittent sites being the most species poor and the least nested. 4. We also observed a significant association between nestedness and niche attributes, with idiosyncratic species exhibiting wider distributions and larger niche breadths compared with nested species. Overall, our results indicate that diatom communities inhabiting hydrologically stable rivers present a higher level of order in community spatial pattern and a higher proportion of specialist taxa than communities in intermittent streams. 5. Because recent hydroclimatic models predict an increase in stream intermittency in the Mediterranean region, our findings may help anticipate future diatom biodiversity patterns resulting from global change. We suggest that the current need to protect a diverse network of sites (as opposed to a few species-rich sites) will be even greater in the near future because local communities are not only probably to become taxonomically and functionally poorer but also less predictable, making it more difficult to implement efficient programmes for biodiversity conservation at the regional scale.

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Section: Causes Of Nestedness In Benthic Diatom Meta-communitiesmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Flow intermittency decreases nestedness and specialisation of diatom communities in Mediterranean rivers

Tornés

Ruhí

2013

Freshwater Biology

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“…Community changes between the wet and the dry season in Mediterranean-climate regions have been reported for many aquatic organisms, including microbes (e.g., [58]), phytoplankton (e.g., [59,60]), benthic algae (e.g., [61][62][63], macroinvertebrates (e.g., [19,64,65]), and fish (e.g., [44,47,63]), and for riparian vegetation (e.g., [66]). Nevertheless, macroinvertebrates are by far the most investigated group and studies on seasonal changes have focused on whole communities as well as the composition of particular taxonomic groups (e.g., Plecoptera [67]; Trichoptera [68]; or Chironomidae [69]).…”

Section: Macroinvertebrate Communitiesmentioning

confidence: 99%

High Variability Is a Defining Component of Mediterranean-Climate Rivers and Their Biota

Cid

Bonada

Carlson

et al. 2017

Water

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Abstract:Variability in flow as a result of seasonal precipitation patterns is a defining element of streams and rivers in Mediterranean-climate regions of the world and strongly influences the biota of these unique systems. Mediterranean-climate areas include the Mediterranean Basin and parts of Australia, California, Chile, and South Africa. Mediterranean streams and rivers can experience wet winters and consequent floods to severe droughts, when intermittency in otherwise perennial systems can occur. Inter-annual variation in precipitation can include multi-year droughts or consecutive wet years. Spatial variation in patterns of precipitation (rain vs. snow) combined with topographic variability lead to spatial variability in hydrologic patterns that influence populations and communities. Mediterranean streams and rivers are global biodiversity hotspots and are particularly vulnerable to human impacts. Biomonitoring, conservation efforts, and management responses to climate change require approaches that account for spatial and temporal variability (including both intra-and inter-annual). The importance of long-term data sets for understanding and managing these systems highlights the need for sustained and coordinated research efforts in Mediterranean-climate streams and rivers.

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“…A similar hydrology‐related masking of seasonal effects was noted by Tornés et al . () in a regulated Mediterranean river. Therefore, these results represent temporal floodplain homogenization in contrast to the spatial floodplain homogenization described by Thomaz et al ().…”

Section: Discussionmentioning

confidence: 99%

Towards deconfounding hydrological and seasonal temperature variability in the determination of selected limnological variables of a temperate floodplain ecosystem

Palijan

2014

Ecohydrology

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This paper presents a methodological approach that can aid the assessment of variation in limnological variables in response to hydrological phases and seasonal temperature variation. The investigation was conducted in the Danube River floodplain, Kopački Rit, Croatia. The proposed approach facilitates a more accurate examination of the effects of first factor, while maintaining second factor less variable, and vice versa. Samples were collected in the floodplain channel and lake along a temporal connectivity gradient, and were grouped according to three hydrological phases (isolation, flow pulse and flood pulse) and according to three seasons (spring, summer and autumn). A permutational multivariate analysis of variance was used to analyse the hydrological effects within seasons, as well as seasonal effects within hydrological phases on selected limnological variables: pH, conductivity, dissolved oxygen, nitrites, nitrates, ammonium, total Kjeldahl nitrogen, total phosphorus, chlorophyll a concentrations and ratio of copiotrophic to oligotrophic bacteria. A multivariate data cloud was structured by hydrological phases during all investigated seasons, but not by all seasons during different hydrological phases. The strongest impact of hydrological phases on limnological variables occurred during summer. Seasonal effects were significant during the isolation and the flood pulse phases. The flow pulse phase somehow obscured the effects of seasonal change, resulting in temporal floodplain homogenization. One possible explanation is that water temperature determines potential limnological conditions, whereas hydrology determines actual conditions. Such results must be taken into account if the accurate effects of hydrology and seasonal change are to be assessed in temperate floodplain ecosystems. Copyright © 2014 John Wiley & Sons, Ltd.

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Reservoirs override seasonal variability of phytoplankton communities in a regulated Mediterranean river

Cited by 30 publications

References 63 publications

Flow intermittency decreases nestedness and specialisation of diatom communities in Mediterranean rivers

Flow intermittency decreases nestedness and specialisation of diatom communities in Mediterranean rivers

High Variability Is a Defining Component of Mediterranean-Climate Rivers and Their Biota

Towards deconfounding hydrological and seasonal temperature variability in the determination of selected limnological variables of a temperate floodplain ecosystem

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