Diel variations in physical and chemical parameters in a semi-arid stream in Spain (Chicamo Stream)

Vidal-Abarca, Rosario; Suárez, Luisa Paz Rodríguez; Gómez, Rosa; Moreno, J.L.; Guerrero, Cristina

doi:10.1080/03680770.2001.11901890

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…More recently, research has focused on natural saline streams in semiarid southern Spain. These studies highlighted the ecological and biogeographical interests in terms of physico-chemical features (Martínez et al 1998;Moreno et al 1995;Vidal-Abarca et al 2001, 2002, primary production (Suárez and Vidal-Abarca 2000;Velasco et al 2003;Gutiérrez-Cánovas et al 2009), secondary production (Barahona et al 2005;Perán et al 1999), invertebrate taxa (Gallardo-Mayenco 1994; Moreno et al 1997Moreno et al , 2004Ribera 2000;Velasco et al 2006), aquatic flora (Aboal 1986(Aboal , 1988Aboal and Fletcher 1996;Moreno et al 2001), the effects of floods on macroinvertebrate communities (Ortega et al 1991), their conservation value (Gómez et al 2005) and the genetics of endangered aquatic coleoptera . The present study is the first that quantifies the seasonal dynamics of a natural saline stream through the analysis of macroinvertebrate community structure.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions

2009

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Semiarid saline streams are rare aquatic ecosystem types. Their constituent biota is expected to have adapted evolutionarily to strong hydrological variability and salinity stress; however, their ecology is not well known. In this study, we quantify the seasonal changes in the structure of the macroinvertebrate community in the Reventón Rambla (south-eastern Spain), a permanent saline spring stream which is included in a drainage system consisting of ephemeral dry channels (so-called ''ramblas''). Seasonal patterns of community structure were studied in two reaches with contrasting environmental regimes using univariate and multivariate statistics. The upstream site showed more stable environmental conditions than the downstream site, and both sites also differed with regard to species richness, and structural and functional group attributes. On a seasonal basis, community dissimilarity was high during periods when both sites were isolated during summer droughts but dissimilarity decreased when both sites were connected through surface flow. Furthermore, the communities tended to show cyclical trajectories in multivariate ordination space. Rather than being related to salinity stress, these patterns seemed to track the hydrological disturbance regime of this rambla system. Spates tended to disrupt communities, while signs of recovery were evident during low-flow periods. Results suggest that salinity fluctuation does not pose a severe abiotic constraint to these adapted macroinvertebrate communities. Their suits of functional properties provide them with the necessary traits to recover quickly from natural disturbance. While human-caused salinization of streams severely impacts communities eventually reducing their recovery potential, our results suggest that communities in natural saline streams may show similar responses to hydrological disturbance as communities from non-saline streams.

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Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions

2009

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“…The basin exhibits several semiarid ecosystems that include different habitat types, and it has high biodiversity and a variety of animals vulnerable to anthropogenic impacts (Velasco et al, 2003;Gómez et al, 2005). These systems present a wide range of environmental conditions, including both extremely low and high conductivities (Vidal-Abarca et al, 2002;Mellado et al, 2002;Sánchez-Montoya et al, 2007). However, since 1979, the Tajo-Segura river diversion has brought water for irrigation; as a consequence, the ecological status of several streams in the basin has decreased (Vidal-Abarca, 1990).…”

Section: Sampling Proceduresmentioning

confidence: 99%

Pollution-toxicity relationships in sediments of the Segura River Basin

García¹,

Gómez²,

Barboza³

et al. 2015

Limnetica

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Pollution-toxicity relationships in sediments of the Segura River BasinRiver basins are characterised by their geomorphology and the water flow of the catchment area and, therefore, the transport and fate of materials suspended and dissolved in the water. In this context, the distribution of pollutants in a river is expected to be determined by the different uses of the soil and the environmental characteristics of the basin. Thus, integrative approaches that consider the causes (pollutants) and effects (toxicities) of anthropogenic impacts and take into account the environmental particularities of a basin are vital for generating appropriate mitigation and management plans for specific sites. Here, we analysed the association between sediment concentrations of trace metals and endocrine disrupting compounds (EDCs) with sediment toxicity levels (genotoxicity) at different altitudinal points of the Segura River Basin. The highest levels of chromium, lead, zinc, nickel and copper, as well as EDCs, were found in downstream points near Orihuela city. Toxicity was positively correlated with most of the pollutants and negatively correlated with the altitude. Due to flow reduction in plain areas, high pollutant concentrations and toxicities were observed in lowlands, where most of the contaminant inputs and accumulations occur.

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“…Flow cessation enhances the correlation between water and air temperatures, leading to larger daily variations in temperature with notably higher water temperatures in the daytime (Morrill et al, 2005). During heatwaves, some unusually high temperatures can be reached (Gómez et al, 2017; Vidal‐Abarca et al, 2002), triggering acute heat stress in phototrophic benthic microorganisms. Given the important functional role of phototrophic biofilms and the predicted climate change scenario, the effects of heat stress on these communities have been understudied.…”

Section: Introductionmentioning

confidence: 99%

Disentangling the effects of microalgal diversity and thermal history on freshwater phototrophic biofilms facing heat stress: A thermal dose approach

et al. 2022

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The increase in heatwave intensity and duration is challenging microalgal photosynthesis in shallow waters. In particular, the extent of photosynthesis impairment or limitation due to short extreme heat stress events occurring during a heatwave remains unknown. In this study, we investigated the importance of microalgal diversity and thermal history in response of phototrophic biofilms to severe heat stress. We exposed isolated microalgal strains, synthetic communities previously acclimated at three temperatures, and natural phototrophic biofilms sampled at different seasons to several temperature/duration pairs (from 31 to 44°C for 30, 60, 120 or 180 min). Microalgal photosynthetic activity (FV/FM) was measured after each heat stress and was shown to be a function of thermal dose, defined as the product of time and an exponential function of temperature. It appeared that the thermal history plays an important role in tolerance to heat stress, with synthetic communities acclimated at highest temperature being more tolerant. However, the responsiveness (i.e. the strength of the response) to heat stress was driven by the microalgal diversity of the community. Synthesis. Our analysis showed that although photosynthetic activity was negatively impacted by heat stress, gross primary productivity was even more strongly and rapidly impacted, highlighting the fact that in situ, even moderate heat stress can significantly impair primary productivity in shallow waters.

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Diel variations in physical and chemical parameters in a semi-arid stream in Spain (Chicamo Stream)

Cited by 5 publications

References 13 publications

Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions

Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions

Pollution-toxicity relationships in sediments of the Segura River Basin

Disentangling the effects of microalgal diversity and thermal history on freshwater phototrophic biofilms facing heat stress: A thermal dose approach

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