Log in

Relevant bibliographies by topics / Mediterranean streams / Journal articles

To see the other types of publications on this topic, follow the link: Mediterranean streams.

Journal articles on the topic 'Mediterranean streams'

Author: Grafiati

Published: 5 June 2025

Last updated: 24 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Mediterranean streams.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Elias, Carmen L., Ana Raquel Calapez, Salomé F. P. Almeida, and Maria João Feio. "From perennial to temporary streams: an extreme drought as a driving force of freshwater communities." Marine and Freshwater Research 66, no. 5 (2015): 469. http://dx.doi.org/10.1071/mf13312.

Full text

Abstract:

Alterations in trait proportions of diatom and aquatic macroinvertebrate communities were used to evaluate the consequences of the drying of temperate perennial streams due to an uncommon drought event. Four Atlantic-temperate Portuguese streams were sampled on three occasions; spring before the drought, 2 weeks after the return of water to the streambed, and spring after the drought. The traits from diatom and macroinvertebrate communities from temperate streams were also compared with those from Mediterranean systems to assess possible shifts in traits. The effects from stream drying were long-lasting for macroinvertebrates; however, only the diatom trait proportions shifted towards proportions similar to those occurring in Mediterranean streams. There was a significant reduction of macroinvertebrates with the ability to produce cocoons, to disperse actively by flight and passively disperse in the water and of swimmers following the return of water. A decrease in stalked species immediately after drought was evident in diatom communities. In contrast to temperate communities, Mediterranean ones were characterised by larger and less mobile diatoms, and smaller-bodied macroinvertebrates with shorter life cycles. Additional studies are required to determine the long-term effect of uncharacteristic drought events on biological traits and their ecosystem functions in typically perennial streams.

APA, Harvard, Vancouver, ISO, and other styles

2

Skoulikidis, Nikolaos T., Anastasia Lampou, and Sofia Laschou. "Unraveling Aquatic Quality Controls of a Nearly Undisturbed Mediterranean Island (Samothraki, Greece)." Water 12, no. 2 (2020): 473. http://dx.doi.org/10.3390/w12020473.

Full text

Abstract:

Due to its rough, mountainous relief, Samothraki remains one of the last minimally disturbed islands in the Mediterranean. This paper examines the hydrogeochemical regime of the island’s surface waters as it results from geological, morphological, and hydro(geo)logical controls within a frame of minimally disturbed environmental conditions. Shallow, fractured groundwater aquifers, in combination with steep slopes and predominant weathering resistant rocks, bring about flashy stream regimes with remarkably low solute concentrations. Streams and springs revealed hydrochemical similarities. Contrary to streams chiefly draining sedimentary rocks, streams underlined by granite and ophiolite rocks do not respond hydrochemically to geochemical differences. Using ion proportions instead of concentrations, geochemical fingertips of magmatic stream basins were detected. Atmospheric inputs largely affect stream and spring composition, e.g., by 75% regarding sodium. Only 20% of dissolved oxygen and pH variance was assigned to biological activity, while nutrient levels were consistent with the undisturbed conditions of the island, except nitrate. Small mountainous springs and brooks fed by restricted, fractured groundwater aquifers with perennial flow, despite scarce summer rainfalls, may be fueled by cloud and fog condensation. High night-day stream flow differences, high atmospheric humidity predominately occurring during the night, and low stream water travel times point out toward this phenomenon.

APA, Harvard, Vancouver, ISO, and other styles

3

Kourgialas, Nektarios N., Chrysoula Ntislidou, Eleana Kazila, Agathos Filintas, and Catherina Voreadou. "An Innovative GIS-Based Policy Approach to Stream Water Quality and Ecological Risk Assessment in Mediterranean Regions: The Case of Crete, Greece." Land 13, no. 11 (2024): 1801. http://dx.doi.org/10.3390/land13111801.

Full text

Abstract:

Due to the multiple pressures from human activities, many freshwater ecosystems are facing degradation. To address this issue, a new approach for assessing stream water quality and ecological (WQE) risk using a multi-criteria analysis through a GIS-based policy tool has been developed. The suggested methodology integrates eight different factors along the contaminant pathway from source to streams, including: (a) rainfall variability, (b) soil texture, (c) soil erodibility, (d) slope, (e) river buffer zone, (f) point source contamination buffer zone, (g) non-point source contamination of NO3, and (h) non-point source contamination of PO4. Utilizing fuzzy GIS tools, the above factors and their related maps were spatially overlaid (raster-based suitability for raster reclassification) to obtain the final stream WQE risk map. The final map depicts the spatial distribution of streams concerning their water quality risk and is represented by two classes of WQE risk. The first class is characterized as “appropriate”, in which there is no need for any further actions, while the other one is characterized as “non-appropriate”, indicating that actions should be taken to ensure the sustainability of streams’ water quality. The proposed approach was implemented for the island of Crete, which is located in the Southeast Mediterranean region. The developed methodology was validated using the Hellenic evaluation system (HESY2), an especially established and adapted to the Mediterranean river systems ecological quality metric method, obtained by in situ measurements that were conducted during different monitoring programs (1989–2015). Moreover, this study summarizes appropriate measures and practices that ensure the sustainable management of Mediterranean river basins. These practices can be adopted by local authorities, owners of polluting units, and farmers/breeders to improve the resiliency of streams’ water quality issues in the Mediterranean region.

APA, Harvard, Vancouver, ISO, and other styles

4

von Schiller, D., E. Martí, and J. L. Riera. "Nitrate retention and removal in Mediterranean streams with contrasting land uses: a <sup>15</sup>N tracer study." Biogeosciences Discussions 5, no. 4 (2008): 3307–46. http://dx.doi.org/10.5194/bgd-5-3307-2008.

Full text

Abstract:

Abstract. We used 15N-labelled nitrate (NO−3) additions to investigate nitrogen (N) cycling at the whole-reach scale in three Mediterranean streams subjected to contrasting land uses (i.e. forested, urban and agricultural). Our aim was to examine: i) the magnitude and relative importance of NO−3 retention (i.e. assimilatory uptake), and removal, (i.e. denitrification), ii) the relative contribution of the different primary uptake compartments to NO−3 retention, and iii) the regeneration, transformation and export pathways of the retained N. The concentration of NO−3 increased and that of dissolved oxygen (DO) decreased from the forested to the agricultural stream, with intermediate values in the urban stream. Standing stocks of primary uptake compartments were similar among streams and dominated by detritus compartments (i.e. fine and coarse benthic organic matter). In agreement, metabolism was net heterotrophic in all streams, although the degree of heterotrophy increased from the forested to the agricultural stream. The NO−3 uptake length decreased along this gradient, whereas the NO−3 mass-transfer velocity and the areal NO−3 uptake rate were highest in the urban stream. Denitrification was not detectable in the forested stream, but accounted for 9% and 68% of total NO−3 uptake in the urban and the agricultural stream, respectively. The relative contribution of detritus compartments to NO−3 assimilatory uptake was highest in the forested and lowest in the agricultural stream. In all streams, the retained N was rapidly transferred to higher trophic levels and regenerated back to the water column. Due to a strong coupling between regeneration and nitrification, most retained N was exported from the experimental reaches in the form of NO−3. This study evidences fast N cycling in Mediterranean streams. Moreover, results indicate that permanent NO−3 removal via denitrification may be enhanced over temporary NO−3 retention via assimilatory uptake in heterotrophic human-altered streams characterized by high NO−3 and low DO concentrations.

APA, Harvard, Vancouver, ISO, and other styles

5

Luís, Ana T., Alexa C. Alexander, Salomé F. P. Almeida, Eduardo Ferreira da Silva, and Joseph M. Culp. "Benthic diatom communities in streams from zinc mining areas in continental (Canada) and Mediterranean climates (Portugal)." Water Quality Research Journal 48, no. 2 (2013): 180–91. http://dx.doi.org/10.2166/wqrjc.2013.043.

Full text

Abstract:

This study compares regional differences in benthic diatom communities exposed to similar stresses in Canada and Portugal. Diatoms were sampled in the Água Forte Stream, Aljustrel (SW Portugal) and in the Little River, New Brunswick (SE Canada), both streams surround the respective zinc mine and are subject to similar metal (e.g. Cd, Cu, Fe, Zn) and acidic (Água Forte pH = 1.9–2.9 vs. Little River pH = 2.2–5.5) stresses. In this kind of extreme environment, diatoms are frequently the main algae group in the streams, widely used as bioindicators. Diatom communities in the Água Forte Stream were dominated mostly by Pinnularia aljustrelica and Eunotia exigua (5% teratological forms), whereas communities in the Little River were more diverse (e.g. Achnanthidium minutissimum, Nitzschia palea, Eunotia sp.). Shannon-Wiener Index (H′) and percentage of taxa relative abundance were used to characterize the diversity and species composition of the diatom communities. Using canonical correspondence analysis (CCA), it was found that regional variation in acceptable in-stream concentrations of metals, conductivity and pH were the primary drivers of benthic diatom community. Mine remediation to decrease metal concentrations and increase pH in streams will increase diatom diversity even in highly impacted streams such as Água Forte.

APA, Harvard, Vancouver, ISO, and other styles

6

von Schiller, D., E. Martí, and J. L. Riera. "Nitrate retention and removal in Mediterranean streams bordered by contrasting land uses: a <sup>15</sup>N tracer study." Biogeosciences 6, no. 2 (2009): 181–96. http://dx.doi.org/10.5194/bg-6-181-2009.

Full text

Abstract:

Abstract. We used 15N-labelled nitrate (NO3−) additions to investigate pathways of nitrogen (N) cycling at the whole-reach scale in three stream reaches with adjacent forested, urban and agricultural land areas. Our aim was to explore among-stream differences in: (i) the magnitude and relative importance of NO3− retention (i.e. assimilatory uptake) and removal (i.e. denitrification), (ii) the relative contribution of the different primary uptake compartments to NO3− retention, and (iii) the regeneration, transformation and export pathways of the retained N. Streams varied strongly in NO3− concentration, which was highest in the agricultural stream and lowest in the forested stream. The agricultural stream also showed the lowest dissolved oxygen (DO) concentration and discharge. Standing stocks of primary uptake compartments were similar among streams and dominated by detritus compartments (i.e. fine and coarse benthic organic matter). Metabolism was net heterotrophic in all streams, although the degree of heterotrophy was highest in the agricultural stream. The NO3− uptake length was shortest in the agricultural stream, intermediate in the urban stream, and longest in the forested stream. Conversely, the NO3− mass-transfer velocity and the areal NO3− uptake rate were highest in the urban stream. Denitrification was not detectable in the forested stream, but accounted for 9% and 68% of total NO3− uptake in the urban and the agricultural stream, respectively. The relative contribution of detritus compartments to NO3− assimilatory uptake was greatest in the forested and lowest in the agricultural stream. In all streams, the retained N was rapidly regenerated back to the water column. Due to a strong coupling between regeneration and nitrification, most retained N was exported from the experimental reaches in the form of NO3−. This study provides evidence of fast in-stream N cycling, although the relative importance of N retention and removal varied considerably among streams. Results suggest that permanent NO3− removal via denitrification may be enhanced over temporary NO3− retention via assimilatory uptake in heterotrophic human-altered streams characterized by high NO3− and low DO concentrations.

APA, Harvard, Vancouver, ISO, and other styles

7

Falasco, E., E. Piano, A. Doretto, S. Fenoglio, and F. Bona. "Resilience of benthic diatom communities in Mediterranean streams: role of endangered species." Marine and Freshwater Research 70, no. 2 (2019): 212. http://dx.doi.org/10.1071/mf17282.

Full text

Abstract:

The extent of drought in Mediterranean streams has been intensifying recently, and the mean annual discharge is expected to experience a decreasing trend in coming years, with significant effects on aquatic ecosystems. The aim of this study was to analyse colonisation patterns of diatom communities that differed in terms of taxonomic composition and percentage of endangered taxa exploring the possible development of resistance mechanisms. To this end, we selected three Mediterranean streams comparable in terms of water quality, but different in terms of surrounding land use, and we performed two experimental treatments. The first treatment consisted in artificially drying and cleaning of substrates (cobbles) to analyse the post-drought recolonisation process that is only driven by drift and immigration. In the second treatment cobbles coming from a site experiencing a seasonal drought were transplanted upstream in a perennial stretch to explore the possible development of resistance mechanisms within diatom communities periodically exposed to droughts. We observed that stream identity played an important role in determining diatom assemblage composition. Highly natural stretches had a high abundance of endangered species, which were less resilient to drought than assemblages composed of general and widespread taxa. Moreover, according to our results, resistance mechanisms did not play a significant role in recovery patterns. Improving our knowledge of diatom resilience mechanisms is very important in a global climate change scenario, especially in Mediterranean streams.

APA, Harvard, Vancouver, ISO, and other styles

8

Almeida, David, Juan Diego Alcaraz-Hernández, Alejandra Cruz, Esther Lantero, David H. Fletcher, and Emili García-Berthou. "Seasonal Effects on Health Status and Parasitological Traits of an Invasive Minnow in Iberian Waters." Animals 14, no. 10 (2024): 1502. http://dx.doi.org/10.3390/ani14101502.

Full text

Abstract:

Biological invasions are of special conservation concern in the Iberian Peninsula and other regions with high levels of endemism. Environmental variability, such as the seasonal fluctuations of Mediterranean streams, is a key factor that affects the spread of aquatic species in novel habitats. Fish parasites have a great potential to reflect such changes in the habitat features of freshwater ecosystems. The aim of this study consisted of seasonally analysing the health status and parasitological traits of non-native fish in Iberian waters. In particular, a strongly invasive population of Languedoc minnow Phoxinus septimaniae (leuciscid species native to south-east France) was assessed in Tordera Stream (north-eastern Iberian Peninsula, Mediterranean conditions). Fish were sampled in April, July, and October 2023 by electrofishing. Health status (external/internal organs) was significantly better in autumn (HAI = 28.8) than spring (HAI = 35.6). Life-cycle complexity was higher in spring (LCI = 1.98), whereas parasite abundance and Shannon diversity were significantly lower in autumn (TA = 19.6 and H’ = 2.15, respectively). In October (more ‘benign’ environmental conditions in Iberian streams), minnows could display elevated foraging activity, with fish increasing their health condition and level of parasite resistance/tolerance. Overall results showed a particular seasonal profile of health and parasite infra-communities that allow this minnow species to thrive under highly fluctuating habitat conditions. This information could help environmental managers to control non-native fish in Mediterranean streams.

APA, Harvard, Vancouver, ISO, and other styles

9

Ball, Joan E., Leah A. Bêche, Patina K. Mendez, and Vincent H. Resh. "Biodiversity in Mediterranean-climate streams of California." Hydrobiologia 719, no. 1 (2012): 187–213. http://dx.doi.org/10.1007/s10750-012-1368-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Meixner, Thomas, Mark Fenn, and Mark Poth. "Nitrate in Polluted Mountainous Catchments with Mediterranean Climates." Scientific World JOURNAL 1 (2001): 564–71. http://dx.doi.org/10.1100/tsw.2001.324.

Full text

Abstract:

The mountains of southern California receive some of the highest rates of nitrogen (N) deposition in the world (~40 kg ha�1 year�1). These high rates of deposition have translated into consistently high levels of nitrate (NO3�) in some streams of the San Bernardino Mountains. However, not all streams are exhibiting these high levels of NO3�. Perennial streams have high NO3� concentrations (~200 [b.mu ]moles l�1) while ephemeral streams do not (~20 [b.mu ]moles l�1). This difference points to groundwater as the source of the NO3� observed in streams. Furthermore, the evidence indicates a differential impact of N deposition on terrestrial and aquatic systems in Mediterranean climates, with aquatic systems being impacted more quickly. The primary reason for this difference involves the asynchrony between the time that atmospheric deposition occurs (summer), the time period of maximum soil NO3� availability and leaching (winter), and the time of maximum plant N demand (spring). Our results indicate that semiarid Mediterranean climate systems behave differently from more humid systems in that, because of this asynchrony, aquatic systems may not be indicative of changes in terrestrial ecosystem response. These differences lead us to the conclusion that the extrapolation of impacts from humid to Mediterranean climates is problematic and the concept of N saturation may need to be revisited for semiarid and seasonally dry systems.

APA, Harvard, Vancouver, ISO, and other styles

11

Romaní, A. M. "Characterization of extracellular enzyme kinetics in two Mediterranean streams." Fundamental and Applied Limnology 148, no. 1 (2000): 99–117. http://dx.doi.org/10.1127/archiv-hydrobiol/148/2000/99.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Cid-Rodríguez, María, Lorena González-Paz, and Cristina Delgado. "Nitzschia transtagensis Morales, Novais, Wetzel, Morais & Ector (Bacillariophyceae) – the second record in the Mediterranean Region." Biodiversity Data Journal 12 (March 19, 2024): e115601. https://doi.org/10.3897/BDJ.12.e115601.

Full text

Abstract:

The Mediterranean Region holds significant ecological importance, characterised by its unique climate, biodiversity and the crucial role it plays in global ecosystems. Mediterranean streams are naturally highly-stressed environments mainly due to fluctuations in water quantity. River flow generally varies from perennial to ephemeral and temporary rivers constitute significant water resources. Streams that flow through Balearic Islands are subjected to these conditions. The majority of these streams sustain water flow for 4–5 months annually, with exceptions noted for streams associated with springs, which typically maintain water throughout most of the year.Benthic diatoms are widely recognised as reliable bioindicators of water quality, used in many aquatic ecosystems. Analysing diatom communities and their biodiversity serves as a valuable tool to ensure the ecological and sustainable utilisation of water resources as well as the accurate development of guidelines for their conservation.The field of diatom taxonomy and distribution plays a crucial role in advancing our understanding of aquatic ecosystems and their biodiversity. Species of the genus <i>Nitzschia</i> are extensively found throughout the Mediterranean Region, including the Balearic Islands. However, they have rarely been investigated in temporary streams.This study presents the first record of <i>Nitzschia transtagensis</i> Morales, Novais, Wetzel, Morais & Ector, outside the type locality and being the second record in Europe. In this study, the authors found this taxon in one temporary stream of Majorca Island, Torrent des Castellot in November 2005 (Balearic Islands). <i>Nitzschia transtagensis</i> occurred at 2.6% abundance in this stream with oligotrophic waters (0.052 mg∙l-1 of nitrate), slightly alkaline pH values (7.8) and water conductivity levels of 626.5 µS cm-1. This species was recorded in the biofilm of the stones together with other taxa such as <i>Achnanthidium minutissimum</i> (Kützing) Czarnecki (39.2%), <i>Gomphonema rosenstockianum</i> Lange-Bertalot & Reichardt (28.9%) and <i>Halamphora oligotraphenta</i> (Lange-Bertalot) Levkov (20.4%). The <i>Nitzschia transtagensis</i> frustules found in the examined material have similar dimensions and a higher fibulae count (8–11 in 10 μm vs. 6–10 in 10 μm) compared to the type material of <i>Nitzschia transtagensis</i>. The habitat characteristics in which this species was found are described, together with LM micrographs of this taxon.

APA, Harvard, Vancouver, ISO, and other styles

13

Puig, M. A., H. Ríos, and M. Aboal. "Food webs in autotrophic and heterotrophic Mediterranean streams." SIL Proceedings, 1922-2010 27, no. 6 (2001): 3308. http://dx.doi.org/10.1080/03680770.1998.11902438.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Verkaik, Iraima, Maria Rieradevall, Scott D. Cooper, John M. Melack, Tom L. Dudley, and Narcís Prat. "Fire as a disturbance in mediterranean climate streams." Hydrobiologia 719, no. 1 (2013): 353–82. http://dx.doi.org/10.1007/s10750-013-1463-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Aragón, Gregorio, Marina Vicente, Gil Fernando Giménez, and Pilar Hurtado. "New data on freshwater lichens in Mediterranean streams." Mediterranean Botany 44 (June 12, 2023): e84924. http://dx.doi.org/10.5209/mbot.84924.

Full text

Abstract:

New chorological data on freshwater lichens in central Spain are presented. We have identified twenty-one saxicolous species resistant to periodic immersion at five localities of Montes de Toledo. Eighteen species are reported for the first time in Castilla-La Mancha territory. Remarkable extensions in the distribution range are found for most lichen species highlighting the importance of intermittent streams for lichen diversity in the Mediterranean Region

APA, Harvard, Vancouver, ISO, and other styles

16

Caballol, Maria, Dora Štraus, Héctor Macia, Xavier Ramis, Miguel Á. Redondo, and Jonàs Oliva. "Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient." Journal of Fungi 7, no. 2 (2021): 112. http://dx.doi.org/10.3390/jof7020112.

Full text

Abstract:

Halophytophthora species have been traditionally regarded as brackish water oomycetes; however, recent reports in inland freshwater call for a better understanding of their ecology and possible pathogenicity. We studied the distribution of Halophytophthora fluviatilis in 117 forest streams by metabarcoding river filtrates taken in spring and autumn and by direct isolation from floating leaves. Pathogenicity on six Fagaceae species and Alnus glutinosa was assessed by stem inoculations. The distribution of H. fluviatilis was correlated with high mean annual temperatures (>93.5% of reports in Ta > 12.2 °C) and low precipitation records. H. fluviatilis was therefore widely distributed in forest streams in a warm–dry climate, but it was mostly absent in subalpine streams. H. fluviatilis was primarily detected in autumn with few findings in spring (28.4% vs. 2.7% of streams). H. fluviatilis was able to cause small lesions on some tree species such as Quercus pubescens, Q. suber and A. glutinosa. Our findings suggest that H. fluviatilis may be adapted to warm and dry conditions, and that it does not pose a significant threat to the most common Mediterranean broadleaved trees.

APA, Harvard, Vancouver, ISO, and other styles

17

Butturini, A., S. Bernal, S. Sabater, and F. Sabater. "The influence of riparian-hyporheic zone on the hydrological responses in an intermittent stream." Hydrology and Earth System Sciences 6, no. 3 (2002): 515–26. http://dx.doi.org/10.5194/hess-6-515-2002.

Full text

Abstract:

Abstract. Stream and riparian groundwater hydrology has been studied in a small intermittent stream draining a forested catchment for a system representative of a Mediterranean climate. The relationship between precipitation and stream runoff and the interactions between stream water and the surrounding riparian groundwater have been analysed under a wide spectrum of meteorological conditions. The hypothesis that the hydrological condition of the near-stream groundwater compartment can regulate the runoff generation during precipitation events was tested. Stream runoff is characterised by a summer dry period, and precipitation input explained only 25% of runoff variability over the study period (r2 =0.25, d.f.=51, p<0.001). The variability of precipitation v. stream runoff is explained partly by the hydrogeological properties of the riparian near-stream zone. This zone is characterised by high hydrological conductivity values and abrupt changes in groundwater level in summer. The summer dry period begins with a rapid decrease in near-stream groundwater level, and ends just after the first autumnal rain when the original groundwater level recovers suddenly. Within this period, storms do not cause major stream runoff since water infiltrates rapidly into the riparian compartment until it is refilled during the subsequent winter and spring; then the precipitation explains the 80% of the stream runoff variability (r2=0.80, d.f.=34, p<0.001). These results suggest that the hydrological interaction between the riparian groundwater compartment and the stream channel is important in elucidating the hydrological responses during drought periods in small Mediterranean streams. Keywords: riparian zone, groundwater hydrology, runoff, intermittent stream, Mediterranean climate

APA, Harvard, Vancouver, ISO, and other styles

18

DE FIGUEROA, JOSÉ MANUEL TIERNO, JULIO MIGUEL LUZÓN-ORTEGA, and MANUEL JESÚS LÓPEZ-RODRÍGUEZ. "A study of stonefly taxa (Insecta: Plecoptera) inhabiting a saline stream (Arroyo Salado) in southern Spain." Zoosymposia 11 (November 18, 2016): 156–63. http://dx.doi.org/10.11646/zoosymposia.11.1.16.

Full text

Abstract:

Few studies of the ecology of Mediterranean saline streams exist. The strong selective pressure exerted by salinity greatly limits the presence of many taxa, Plecoptera (stoneflies) among them. However, a few species of stoneflies have been reported inhabiting saline streams, particularly components of the thermophilous biocoenosis seemed to have adapted to salinity pulses caused by fluctuations in annual rainfall. For two years, three sites within a saline stream, Arroyo Salado in southern Iberian Peninsula, were sampled to determine the stonefly species composition. Conductivity at the three sites ranged from 2290 to 87792, 2550 to 90824, and 206 to 2818 μS/cm, respectively. A total of seven different stonefly taxa were identified at the three sites: Brachyptera auberti Consiglio, Nemoura lacustris Pictet, Capnioneura libera (Navás), Tyrrhenoleuctra sp., Hemimelaena flaviventris (Pictet), Protonemura alcazaba Aubert, and Perla marginata (Panzer), the latter two only at the site where the stream flowed continuously and conductivity was lower. The possible strategies enabling these stonefly species to surviving in Arroyo Salado are discussed.

APA, Harvard, Vancouver, ISO, and other styles

19

Ros, M. Dolores, José Pedro Marín-Murcia, and Marina Aboal. "Biodiversity of diatom assemblages in a Mediterranean semiarid stream: implications for conservation." Marine and Freshwater Research 60, no. 1 (2009): 14. http://dx.doi.org/10.1071/mf07231.

Full text

Abstract:

Many semiarid streams are threatened both by human demands and climatic effects (global warming), but little is known about their algal biodiversity and their conservation value, especially in Mediterranean areas. The aim of the present study was to evaluate annual changes in the structure and species richness of diatom communities in runs and pools of an oligohaline, semiarid stream in south-eastern Spain, and their relationship with nutrients and hydrology. The pool substrate was covered most of the time by a yellow-brown coat, mainly composed of diatoms and a few cyanophytes (Leptolyngbya). In the runs, cyanophytes were dominant (Rivularia) and diatoms occurred as epiphytes. The diversity of these diatom assemblages was high, particularly in the pools. Some species were present throughout the year, whereas others showed a bimodal growth pattern. Maximum biomasses were reached in summer in the pools and in autumn in the runs, when levels of phosphorus increased as a result of flooding. Species richness and diversity were correlated with hydrology and sulfate concentrations, whereas biomass (as chlorophyll a and ash-free dry weight) was associated with variations in temperature, conductivity and ammonium. These semiarid streams are refuges of biodiversity, representing habitats reliant on cycles of drought and floods, which should be considered in proposals for their conservation.

APA, Harvard, Vancouver, ISO, and other styles

20

García-García, V., R. Gómez, M. R. Vidal-Abarca, and M. L. Suárez. "Nitrogen retention in natural Mediterranean wetland-streams affected by agricultural runoff." Hydrology and Earth System Sciences 13, no. 12 (2009): 2359–71. http://dx.doi.org/10.5194/hess-13-2359-2009.

Full text

Abstract:

Abstract. Nitrogen retention efficiency in natural Mediterranean wetland-streams affected by agricultural runoff was quantified and the effect of the temporal variability and hydrological/chemical loading was examined from March 2007 to June 2008 in two wetland-streams located in Southeast Spain. Nitrate-N (NO−3-N), ammonium-N (NH+4-N), total nitrogen-N (TN-N), total organic nitrogen-N (TON-N) and chloride (Cl−) concentrations were analyzed to calculate nitrogen retention efficiencies. These wetland-streams consistently reduced water nitrogen concentration throughout the year with higher values for NO−3-N (72.3%), even though the mean value of inflow NO−3-N concentrations was above 20 mg l−1. Additionally, they usually acted as sinks for TON-N (8.4%), but as sources for NH+4-N. Over the entire study period, the Taray and Parra wetland-streams were capable of removing on average 1.6 and 0.8 kg NO−3-N a day−1, respectively. Retention efficiencies were not affected by temperature variation. NO−3-N retention efficiency followed a seasonal pattern with the highest retention values in summer (June–September). The temporal variability for NO−3-N retention efficiency was positively and negatively explained by the hydrologic retention and the inflow NO−3-N concentration (R2adj=0.815, p<0.01), respectively. No significant regression model was found for TON-N and NH+4-N. Finally, the conservation of these Mediterranean wetland-streams may help to not only improve the surface water quality in agricultural catchments, but to also achieve good ecological status for surface waters, this being the Water Framework Directive's ultimate purpose.

APA, Harvard, Vancouver, ISO, and other styles

21

Larsen, Stefano, Laura Mancini, Giorgio Pace, Massimiliano Scalici, and Lorenzo Tancioni. "Weak Concordance between Fish and Macroinvertebrates in Mediterranean Streams." PLoS ONE 7, no. 12 (2012): e51115. http://dx.doi.org/10.1371/journal.pone.0051115.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Guasch, Helena, and Sergi Sabater. "Primary production of epilithic communities in undisturbed Mediterranean streams." SIL Proceedings, 1922-2010 25, no. 3 (1994): 1761–64. http://dx.doi.org/10.1080/03680770.1992.11900484.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

SÁNCHEZ-MONTOYA, MARIA DEL MAR, TURA PUNTÍ, MARIA LUISA SUÁREZ, et al. "Concordance between ecotypes and macroinvertebrate assemblages in Mediterranean streams." Freshwater Biology 52, no. 11 (2007): 2240–55. http://dx.doi.org/10.1111/j.1365-2427.2007.01826.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Fierro, Pablo, Ivan Arismendi, Robert M. Hughes, Claudio Valdovinos, and Alfonso Jara-Flores. "A benthic macroinvertebrate multimetric index for Chilean Mediterranean streams." Ecological Indicators 91 (August 2018): 13–23. http://dx.doi.org/10.1016/j.ecolind.2018.03.074.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Sánchez-Montoya, M. M., M. R. Vidal-Abarca, T. Puntí, et al. "Defining criteria to select reference sites in Mediterranean streams." Hydrobiologia 619, no. 1 (2008): 39–54. http://dx.doi.org/10.1007/s10750-008-9580-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Hershkovitz, Yaron, and Avital Gasith. "Resistance, resilience, and community dynamics in mediterranean-climate streams." Hydrobiologia 719, no. 1 (2012): 59–75. http://dx.doi.org/10.1007/s10750-012-1387-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Beltrami, Maria Elena, Sául Blanco, Nicolas Scheidecker, et al. "GOMPHONEMA VIDALIISP. NOV. A NEW DIATOM FROM MEDITERRANEAN STREAMS." Diatom Research 25, no. 1 (2010): 29–42. http://dx.doi.org/10.1080/0269249x.2010.9705827.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Mazzoni, Rosana, Piatã Santana Marques, and Javier Lobón-Cervià. "PRODUÇÃO DE PEIXES EM RIACHO: REVISITANDO PRINCÍPIOS, MÉTODOS E PERSPECTIVAS." Oecologia Australis 25, no. 02 (2021): 464–74. http://dx.doi.org/10.4257/oeco.2021.2502.15.

Full text

Abstract:

Production studies are fundamental for understanding various aspects of the organization and functioning of aquatic systems. The current state of knowledge on this subject is still little explored, especially regarding streams in the Neotropical region. In this study, we present the main theoretical frameworks, the different methods available in the literature, as well as perspectives on the topic for fish from neotropical streams. We emphasize that all available methods lead to similar results and the choice of one or the other falls on the circumstances of the research. For tropical stream fish we recommend using the Size Distribution Method. We also present a step-by-step guide for using the R software (TropFishR package) for production calculations. A comparative approach is carried out for the known production rates in Tropical, Temperate and Mediterranean regions, suggesting an inverse pattern between the species diversity and the production rates of these environments. We hope, with the present study, to stimulate research in this area of knowledge, to include the patterns and processes that generate production in neotropical streams in a broader context of ecological theory.

APA, Harvard, Vancouver, ISO, and other styles

29

Gallart, F., N. Prat, E. M. García-Roger, et al. "Developing a novel approach to analyse the regimes of temporary streams and their controls on aquatic biota." Hydrology and Earth System Sciences Discussions 8, no. 5 (2011): 9637–73. http://dx.doi.org/10.5194/hessd-8-9637-2011.

Full text

Abstract:

Abstract. Temporary streams are those water courses that undergo the recurrent cessation of flow or the complete drying of their channel. The biological communities in temporary stream reaches are strongly dependent on the temporal changes of the aquatic habitats determined by the hydrological conditions. The use of the aquatic fauna structural and functional characteristics to assess the ecological quality of a temporary stream reach can not therefore be made without taking into account the controls imposed by the hydrological regime. This paper develops some methods for analysing temporary streams' aquatic regimes, based on the definition of six aquatic states that summarize the sets of mesohabitats occurring on a given reach at a particular moment, depending on the hydrological conditions: flood, riffles, connected, pools, dry and arid. We used the water discharge records from gauging stations or simulations using rainfall-runoff models to infer the temporal patterns of occurrence of these states using the developed aquatic states frequency graph. The visual analysis of this graph is complemented by the development of two metrics based on the permanence of flow and the seasonal predictability of zero flow periods. Finally, a classification of the aquatic regimes of temporary streams in terms of their influence over the development of aquatic life is put forward, defining Permanent, Temporary-pools, Temporary-dry and Episodic regime types. All these methods were tested with data from eight temporary streams around the Mediterranean from MIRAGE project and its application was a precondition to assess the ecological quality of these streams using the current methods prescribed in the European Water Framework Directive for macroinvertebrate communities.

APA, Harvard, Vancouver, ISO, and other styles

30

Sroczyńska, K., F. Leitão, I. Maximo, and P. Range. "Independent effects of habitat and stream typology on macroinvertebrate communities in Mediterranean-type intermittent streams." Limnetica 38, no. 2 (2019): 535–53. http://dx.doi.org/10.23818/limn.38.31.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Topaz, Tom, Roey Egozi, Gil Eshel, and Benny Chefetz. "Pesticide load dynamics during stormwater flow events in Mediterranean coastal streams: Alexander stream case study." Science of The Total Environment 625 (June 2018): 168–77. http://dx.doi.org/10.1016/j.scitotenv.2017.12.213.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Ferreira, M. Teresa, and Francisca C. Aguiar. "Riparian and aquatic vegetation in Mediterranean-type streams (western Iberia)." Limnetica 25, no. 1 (2006): 411–24. http://dx.doi.org/10.23818/limn.25.29.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Gkenas, Christos, Maria Filomena Magalhães, Julien Cucherousset, Rafael Leonardo Orjuela, and Filipe Ribeiro. "Dietary niche divergence between two invasive fish in Mediterranean streams." Knowledge & Management of Aquatic Ecosystems, no. 420 (2019): 24. http://dx.doi.org/10.1051/kmae/2019018.

Full text

Abstract:

Clarifying the mechanisms associated with the coexistence of invasive species is important to understand the overall impact of multiple invasions on recipient communities. Here we examined whether divergence or convergence in dietary niche occurred when invasive Lepomis gibbosus and Australoheros facetus coexist in Iberian streams. We used stomach content analyses to determine dietary niche composition, width, and overlap in allopatric and sympatric counterparts in the Lower Guadiana throughout the dry-season. The variations in dietary niche between pumpkinseed and the cichlid were consistent with predictions derived from the niche divergence hypothesis. Although there were no changes in the use of plant material from allopatry to sympatry in either species, sympatric pumpkinseed and the cichlid displayed marked shifts in the use of animal prey and a decrease in niche width relative to allopatric counterparts. Moreover, sympatric pumpkinseed and cichlid showed similar niche width but differed significantly in plant and animal prey use. Taken together these results suggest that divergence in dietary niches may play a role in mediating coexistence of multiple invaders in Iberian streams.

APA, Harvard, Vancouver, ISO, and other styles

34

Figueroa, Ricardo, Núria Bonada, Meyer Guevara, et al. "Freshwater biodiversity and conservation in mediterranean climate streams of Chile." Hydrobiologia 719, no. 1 (2013): 269–89. http://dx.doi.org/10.1007/s10750-013-1685-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Romaní, Anna M., Stefano Amalfitano, Joan Artigas, et al. "Microbial biofilm structure and organic matter use in mediterranean streams." Hydrobiologia 719, no. 1 (2012): 43–58. http://dx.doi.org/10.1007/s10750-012-1302-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Robson, Belinda J., Edwin T. Chester, Bradley D. Mitchell, and Ty G. Matthews. "Disturbance and the role of refuges in mediterranean climate streams." Hydrobiologia 719, no. 1 (2012): 77–91. http://dx.doi.org/10.1007/s10750-012-1371-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Camarasa-Belmonte, Ana M. "Flash floods in Mediterranean ephemeral streams in Valencia Region (Spain)." Journal of Hydrology 541 (October 2016): 99–115. http://dx.doi.org/10.1016/j.jhydrol.2016.03.019.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Vila-Gispert, Anna, Carles Alcaraz, and Emili García-Berthou. "Life-history traits of invasive fish in small Mediterranean streams." Biological Invasions 7, no. 1 (2005): 107–16. http://dx.doi.org/10.1007/s10530-004-9640-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Millán, A., J. Velasco, C. Gutiérrez-Cánovas, et al. "Mediterranean saline streams in southeast Spain: What do we know?" Journal of Arid Environments 75, no. 12 (2011): 1352–59. http://dx.doi.org/10.1016/j.jaridenv.2010.12.010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Falasco, Elisa, Elena Piano, and Francesca Bona. "Diatom flora in Mediterranean streams: flow intermittency threatens endangered species." Biodiversity and Conservation 25, no. 14 (2016): 2965–86. http://dx.doi.org/10.1007/s10531-016-1213-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Oueslati, Ons, Anna Maria De Girolamo, Aziz Abouabdillah, Thomas R. Kjeldsen, and Antonio Lo Porto. "Classifying the flow regimes of Mediterranean streams using multivariate analysis." Hydrological Processes 29, no. 22 (2015): 4666–82. http://dx.doi.org/10.1002/hyp.10530.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

De Girolamo, Anna Maria, Giovanni Francesco Ricci, Ossama M. M. Abdelwahab, et al. "Suspended Sediment Transport in Mediterranean Streams: Monitoring and Load Estimation." Water 15, no. 15 (2023): 2715. http://dx.doi.org/10.3390/w15152715.

Full text

Abstract:

The suspended sediment (SS) load provides valuable insights into soil loss magnitude, requiring comprehensive monitoring of streamflow (Q) and SS concentrations (SSC) across various hydrological conditions. The primary aim of this paper was to quantify SS loads in two mountainous river basins: the Carapelle (506 km2) and the Celone (72 km2) located in Apulia (Southeast Italy) where different monitoring strategies were adopted (i.e., continuous and discrete). The specific objective was to develop sediment rating curves to address gaps in the SSC time series. An optical probe was used to continuously monitor the SSC during 2007 to 2011 in a river section of the Carapelle river, while Q was measured with the ultrasonic method. A comprehensive dataset comprising continuous Q measurements and discrete SSC measurements was systematically acquired for the Celone river over the period of 2010 to 2011. Distinct sediment rating curves were formulated for three specific subsets of data delineated by discernible hydrological conditions (i.e., high, normal, and low flow) and SSCs were computed for the missing daily records. The annual specific sediment load exhibited a range of 2.4 to 6.06 t ha−1 yr−1 for the Celone river, while the Carapelle river displayed a range of 0.9 to 7.45 t ha−1 yr−1. A significant majority of the SS load was transported during high-flow conditions, accounting for over 80% of the total load. In contrast, during low-flow conditions, the SS load constituted less than 1% of the total load. The findings of this study highlight the significance of the hydrological regime as a critical factor influencing sediment transport in mountainous Mediterranean rivers. Furthermore, it demonstrates that the duration of the sampling period, along with its specific characteristics, such as dry or wet conditions, can have a substantial impact on the accurate quantification of the sediment load.

APA, Harvard, Vancouver, ISO, and other styles

43

De, Girolamo Anna Maria. "Suspended Sediment Transport in Mediterranean Streams: Monitoring and Load Estimation." Water 15, no. 2715 (2023): 2–18. https://doi.org/10.3390/w15152715.

Full text

Abstract:

The suspended sediment (SS) load provides valuable insights into soil loss magnitude, requiring comprehensive monitoring of streamflow (Q) and SS concentrations (SSC) across various hydrological conditions. The primary aim of this paper was to quantify SS loads in two mountainous river basins: the Carapelle (506 km<sup>2</sup>) and the Celone (72 km<sup>2</sup>) located in Apulia (Southeast Italy) where different monitoring strategies were adopted (i.e., continuous and discrete). The specific objective was to develop sediment rating curves to address gaps in the SSC time series. An optical probe was used to continuously monitor the SSC during 2007 to 2011 in a river section of the Carapelle river, while Q was measured with the ultrasonic method. A comprehensive dataset comprising continuous Q measurements and discrete SSC measurements was systematically acquired for the Celone river over the period of 2010 to 2011. Distinct sediment rating curves were formulated for three specific subsets of data delineated by discernible hydrological conditions (i.e., high, normal, and low flow) and SSCs were computed for the missing daily records. The annual specific sediment load exhibited a range of 2.4 to 6.06 t ha<sup>−1</sup> yr<sup>−1</sup> for the Celone river, while the Carapelle river displayed a range of 0.9 to 7.45 t ha<sup>−1</sup> yr<sup>−1</sup>. A significant majority of the SS load was transported during high-flow conditions, accounting for over 80% of the total load. In contrast, during low-flow conditions, the SS load constituted less than 1% of the total load. The findings of this study highlight the significance of the hydrological regime as a critical factor influencing sediment transport in mountainous Mediterranean rivers. Furthermore, it demonstrates that the duration of the sampling period, along with its specific characteristics, such as dry or wet conditions, can have a substantial impact on the accurate quantification of the sediment load.

APA, Harvard, Vancouver, ISO, and other styles

44

Aboal, Marina, and MªAngeles Puig. "Microcystin production in Rivularia colonies of calcareous streams from Mediterranean Spanish basins." Algological Studies 130 (October 1, 2009): 39–52. http://dx.doi.org/10.1127/1864-1318/2009/0130-0039.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Aparicio, Enric, Rafel Rocaspana, Adolfo de Sostoa, Antoni Palau-Ibars, and Carles Alcaraz. "Movements and dispersal of brown trout (Salmo trutta Linnaeus, 1758) in Mediterranean streams: influence of habitat and biotic factors." PeerJ 6 (October 12, 2018): e5730. http://dx.doi.org/10.7717/peerj.5730.

Full text

Abstract:

Dispersal is a critical determinant of animal distribution and population dynamics, and is essential information for management planning. We studied the movement patterns and the influence of habitat and biotic factors on Mediterranean brown trout (Salmo trutta) by mark-recapture methods in three headwater streams of the Ebro Basin (NE Iberian Peninsula). Fish were sampled by electrofishing on five occasions over 18–24 months and movements of over 3,000 individually tagged trout (age 1+ onwards) were recorded. Most of the tagged fish exhibited limited movement and were recaptured within 100 m from the initial capture section. Small seasonal differences in the movement pattern were observed, but in two of the streams, displacement distances increased prior the spawning period in autumn. The frequency distributions of dispersal distances were highly leptokurtic and skewed to the right and fitted well to a two-group exponential model, thus trout populations were composed of mobile and stationary individuals, the latter being the predominant component in the populations (71.1–87.5% of individuals). The mean dispersal distances, for fish captured at least in three sampling events, ranged 20.7–45.4 m for the stationary group and 229.4–540.5 m for the mobile group. Moving brown trout were larger than non-moving individuals and exhibited higher growth rates in two of the streams. Habitat features were not consistently linked to movement rates, but there were some interaction effects between stream and habitat characteristics such as depth, cover and water velocity.

APA, Harvard, Vancouver, ISO, and other styles

46

Guilherme, João L., Afonso Rocha, Hugo Lousa, and José A. Alves. "Are artificial agricultural ponds a suitable alternative nesting habitat for the Little Ringed Plover?" Avian Biology Research 12, no. 4 (2019): 133–38. http://dx.doi.org/10.1177/1758155919856770.

Full text

Abstract:

Climatic scenarios for the Mediterranean predict an increase in drought and erratic precipitation, which may affect waterbirds breeding in freshwater habitats. Artificial wetlands may provide an alternative for these species when conditions in natural habitats deteriorate. We studied Little Ringed Plovers Charadrius dubius nesting in natural streams and agricultural ponds in southern Portugal. Based on 24 nests and 31 colour-ringed adults, we describe nest-site characteristics, breeding parameters and site fidelity. In streams, nests (n = 17) were in sites with more abundant and coarser gravel, while in ponds there was more vegetation around the nest (n = 7). In both habitats, nests were close and at similar distances to water, but this was unrelated to nest outcome (success of 30.8% across habitats). Nest failure in natural streams was mostly attributable to flooding after heavy rains, while in agricultural ponds cattle trampling was the main cause of failure. Based on their renesting capacity and relatively high breeding site fidelity (25%–36% return rate to same area), we suggest that Little Ringed Plovers may trade-off the overall better conditions of natural streams (i.e. higher availability of nesting substrate, food resources and lower disturbance from cattle) against the stochastic risk of floods. Nevertheless, under current predictions of climate change, agricultural ponds can provide more stable and reliable nesting conditions for this and other species, as unpredictable changes in Mediterranean streams’ flooding regimen may become more frequent. Despite the limitations of our dataset, we provide novel information on the breeding biology of this understudied species and highlight its potential for future research.

APA, Harvard, Vancouver, ISO, and other styles

47

JESÚS CASAS, J., MARK O. GESSNER, DALILA LÓPEZ, and ENRIQUE DESCALS. "Leaf-litter colonisation and breakdown in relation to stream typology: insights from Mediterranean low-order streams." Freshwater Biology 56, no. 12 (2011): 2594–608. http://dx.doi.org/10.1111/j.1365-2427.2011.02686.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Prenda, José, and Alfonso Gallardo‐Mayenco. "Distribution Patterns, Species Assemblages and Habitat Selection of the Stoneflies (Plecoptera) from Two Mediterranean River Basins in Southern Spain." International Review of Hydrobiology 84, no. 6 (1999): 595–608. http://dx.doi.org/10.1002/iroh.199900054.

Full text

Abstract:

AbstractThe stonefly distribution and its relationship with habitat changes, based on stream physico chemical features, were investigated in two Mediterranean river basins (Guadaira and Guadalete, S Spain). Plecopteran nymph distribution varied along an elevation gradient. Both stonefly species richness and species diversity increased with altitude. Stoneflies were able to tolerate a wide range of environmental conditions but were absent from low altitude sites, temporary streams with high salinity values and high water temperature. A total of 13 stonefly species were found in the study area, from which Tyrrhenoleuctra minuta (Klapálek) and Protonemura sp. were dominant. The most widespread species were Nemoura lacustris and Capnioneura mitis. Three distinct species assemblages were observed according to their distribution patterns, but with similar environmental preferences. Capnioneura petitpierreae and T. minuta showed preferences to low altitude sites, whereas C. mitis and N. lacustris were found throughout all sites. T. minuta and N. lacustris inhabited permanent and temporary sites, while the same species and C. mitis also were found in semipermanent streams. Temporally, most stoneflies were caught during winter (85.9%), especially at the low altitude sites.

APA, Harvard, Vancouver, ISO, and other styles

49

EVELPIDOU, Niki, Niki POLYKRETI, Anna KARKANI, Eirini KARDARA, Stamatina SEFERLI, and Theofilos VALSAMIDIS. "Modelling flood hazard at Paratrechos/Peritsi stream, Naxos Island (Cyclades, Greece)." Revista de Geomorfologie 20, no. 1 (2018): 123–29. http://dx.doi.org/10.21094/rg.2018.035.

Full text

Abstract:

Flash floods are one of the most significant natural hazards in the Mediterranean, affecting most basins in the region. Flash floods usually occur in ephemeral streams after particularly heavy rainfall. Although the average annual rainfall in the Cycladic islands (Greece) does not exceed 400 mm, flash floods are frequent, since most of that rainfall is often concentrated in few but very intense events. The case study is the drainage basin of Paratrechos or Peritsi stream in Naxos Island. This particular basin was selected due to the recorded flood events, the stream's proximity to the city that intensifies the flood impact, the slopes' gradient abrupt changes and the diverse infiltration rate of the geological formations. Furthermore, some parts of the basin are intact by human activities, while others are severely affected. This study investigates the relationship between rain and runoff through Unitary Hydrographs, in order to estimate and evaluate the flood potential of the aforementioned hydrologic basin and to determine the causes of the hazard and vulnerability. The Clark method was implemented and its results were further evaluated by field measurements.

APA, Harvard, Vancouver, ISO, and other styles

50

Robson, B. J., E. T. Chester, and C. M. Austin. "Why life history information matters: drought refuges and macroinvertebrate persistence in non-perennial streams subject to a drier climate." Marine and Freshwater Research 62, no. 7 (2011): 801. http://dx.doi.org/10.1071/mf10062.

Full text

Abstract:

In some arid, semi-arid or Mediterranean climate regions, increased water extraction combined with climate change will prolong periods of drought in non-perennial streams, but the effects on macroinvertebrate populations are poorly understood. Drought refuges allow species to survive drying but their use depends on species’ traits, and refuge availability depends on landscape structure. This review evaluates the utility of existing ecological concepts for predicting the role of drought refuges for sustaining biodiversity in non-perennial streams. We also suggest traits that may determine invertebrate species’ resistance or resilience to prolonged drying. Parts of the likely responses by populations to increased stream drying are described by existing ecological concepts, such as the biological traits of species and their interaction with the habitat templet, barriers to dispersal and metapopulation dynamics, the use of drought refuges, habitat fragmentation and population and landscape genetics. However, the limited knowledge of invertebrate life histories in non-perennial streams restricts our ability to use these concepts in a predictive manner. In particular, reach or pool occupancy by species cannot be accurately predicted, but such predictions are necessary for evaluating potential management actions such as the use of environmental flows to sustain drought refuges during dry periods.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!