Seasonal Variability of Particulate Organic Matter in a Mountain Stream in Central Spain

Mollá, Salvador; Robles, Sandra; Casado, Carmen M.

doi:10.1002/iroh.200510857

Cited by 7 publications

(7 citation statements)

References 52 publications

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“…The most prominent temporal trend during our study was the autumn peak of PM in drift samples. Those observations diverge from results of seston research within Spanish (Molla et al 2006) and Pennsylvania (Richardson et al 2009) streams that evidenced peaking spring/summer PM concentrations, suggesting that spring/summer seston maxima might be a consequence of maximal stream organism activity (i.e., feeding and bioturbation) during warm seasons. In the previous study, Sertić Perić et al (2011) suggested that the autumn-peaking PM trend derives from the typical seasonal die-back of in-stream vegetation, and increased moss fragility caused by lack of protection by tufa accumulation during colder seasons.…”

Section: Patterns Of Particulate Matter Transportcontrasting

confidence: 86%

Meiofauna constitute a considerable portion of invertebrate drift among moss-rich patches within a karst hydrosystem

Perić¹,

Dražina²,

Špoljar³

et al. 2014

Biologia

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Aiming to establish the most frequent invertebrate taxa in drift at the small spatial scale within a moss-rich karst tufa-precipitating hydrosystem, we sampled drift among microhabitats differing in substratum type and flow conditions along a tufa barrier-cascading lotic reach. Additionally, we addressed the question of the contribution and the potential significance of meiofauna within the overall invertebrate drift at the small spatial scale. During the study period, a total of 60 invertebrate taxa were recorded in the drift. Six of these taxa belonged to the annelid/arthropod meiofauna and they represented 35% of total drift density. Macroinvertebrates found in drift were represented mainly by larval insects. The composition of the most abundant taxa in total drift was as follows: Alona spp. (Cladocera 26.7%), Riolus spp. (Coleoptera: Elmidae 13.2%), Simulium spp. (Diptera: Simuliidae 12.2%), Enchytraeidae (Oligochaeta 10.4%), Hydrachnidia (6.3%), Orthocladinae (Diptera: Chironomidae 3.9%) and Naididae (Oligochaeta 3.6%). Faunal drift densities and amounts of transported particulate matter (PM) were highest at the fast-flowing sites located at the barriers and lowest at the slowflowing sites within pools. Similarly to the seasonal amounts of transported PM, faunal drift was lowest in winter, and peaked in autumn and in late spring/early summer. Correlation between flow velocity and PM-faunal drift densities suggested a significant effect of the dislodged PM, though a minor influence of discharge and flow velocity on faunal drift. We suggest that the small-scale habitat heterogeneity and the respective feeding and refugial strategies of the fauna, as well as faunal passive dislodgement initiated by the shear forces of the flow were the most important drivers of observed drift patterns.

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Section: Patterns Of Particulate Matter Transportcontrasting

confidence: 86%

Meiofauna constitute a considerable portion of invertebrate drift among moss-rich patches within a karst hydrosystem

Perić¹,

Dražina²,

Špoljar³

et al. 2014

Biologia

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“…Therefore, we focused on baseflow transport of seston and POC. At base flow, seasonal peaks of POC concentration have been attributed to increased macroinvertebrate fragmentation of leaf litter as stream temperature increases (Molla et al 2006). …”

mentioning

confidence: 99%

Temporal dynamics of seston: A recurring nighttime peak and seasonal shifts in composition in a stream ecosystem

et al. 2009

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We measured the baseflow concentration and composition of seston and suspended particulate organic carbon (POC) over a 1-yr period in White Clay Creek, a third-order stream in the southeastern Pennsylvania Piedmont, to assess temporal variability in seston concentration and quality at seasonal and diel timescales. Each month, we sampled stream water under baseflow conditions every 1.5 h over a 24-h period and measured seston and POC concentrations, carbon composition, pigment content, and 13 C isotopic ratios. Seston and POC concentrations exhibited a strong diel pattern; nighttime concentrations exceeded daytime concentrations by 80% and 43%, respectively. Suspended chlorophyll a concentrations did not exhibit a diel pattern. We attribute the diel pattern of seston concentration to bioturbation by the nocturnal stream community, including crayfish, amphibians, eels, and macroinvertebrates. Seasonally, carbon content of seston increased from 9% throughout most of the year to 15% during November, December, and March, while seston d 13 C was depleted in the late fall and enriched in early spring months relative to the rest of the year. Chlorophyll a and pheophytin a concentrations in seston peaked during the early spring. Seasonal patterns in seston and POC composition reflect cycles of autumnal leaf litter inputs and vernal algal production. Bioturbation and shifts in organic carbon inputs mediate changes in POC quality and fluxes, which affect the bioavailability of POC and ultimately influence rates of heterotrophic respiration.

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“…Notwithstanding the increase in average downstream export in high-flow conditions, there was no increase in average downstream suspended particulate concentration across all sites, suggesting that increased discharge rather than concentration was the main driver of the increase in suspended particulate export. Higher discharge and flow velocity increases the capacity of a stream to remove sediment and keep it in suspension (Golladay, 1997;Mollá et al, 2006). We did not sample during storm events-which were virtually absent during our survey period-when suspended particulate export is likely to be the greatest (Wallace et al, 1991;Golladay, 1997).…”

Section: Discussionmentioning

confidence: 94%

“…Higher concentrations of organic suspended particulate in summer compared to winter/autumn may occur due to increased biological activity during the warmer months (Mollá et al, 2006). However, the streams in our study were highly shaded (c. 80%) and water temperature was indistinguishable between seasons (low flow -spring -mean = 11.6 ± 1.5°C SD, high flow -summer -mean = 11.8 ± 2.4°C SD), so there was unlikely to be a large difference in biological activity between seasons.…”

Section: Discussionmentioning

confidence: 98%

“…However, we found no change in stored BOM between flow seasons despite large differences in discharge. In highly retentive streams, stored BOM can be relatively constant, changing only when there are extreme high-flow events (Wallace et al, 1995;Mollá et al, 2006). In three headwater streams in the Appalachian Mountains of the eastern USA, over a period of almost a decade, export of coarse particulate organic matter (CPOM) was little correlated with discharge and was more closely associated with storm frequency and magnitude (Wallace et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

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Do tributaries affect loads and fluxes of particulate organic matter, inorganic sediment and wood? Patterns in an upland river basin in south-eastern Australia

2009

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Tributary junctions are points in river networks where there can be an influx of organic matter and inorganic sediment. Addition of materials at tributary junctions is likely to alter food availability and habitat for aquatic organisms. We surveyed junctions of upland cobble-bed streams (stream orders 1-4, 2.2-10.8 m wide) in the Acheron River catchment (or watershed) in Victoria, Australia, to determine whether tributaries were an important source of suspended particulate matter, and whether benthic organic matter and coarse wood density increased at tributary junctions. We conducted measurements in high (austral spring 2005) and low flows (austral summer 2006) seasons. There were no systematic patterns in concentrations of suspended particulate matter with respect to positions within confluences (tributaries, upstream mainstem, downstream mainstem and confluence). However, total exports of suspended particulate matter in high-flow appeared to be the summation of exports from the upstream mainstem and the tributary in an approximate ratio of 2:1. In low flow, the 2:1 ratio was similar but the downstream mainstem value was similar to the upstream mainstem value (i.e., no clear summation). The fraction of organic matter in the suspended particulate matter did not depend on position within the junction, but was about 19% higher in the low-flow season. Tributaries had lower amounts of benthic organic matter than any measured positions in the mainstem, which themselves were indistinguishable. However, benthic organic matter was positively related to discharge ratio (tributary:mainstem), which may indicate that smaller, upriver junctions, which tended to have higher discharge ratios, were associated with higher standing crops of benthic organic matter. The distribution of coarse wood (logs and branches C10 cm diameter) was asystematic with respect to position in the junction. Overall, tributaries had little effect in these junctions, with the most evident effect being an increase of about one-third in exports of suspended particulate matter when flows are high.

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Seasonal Variability of Particulate Organic Matter in a Mountain Stream in Central Spain

Cited by 7 publications

References 52 publications

Meiofauna constitute a considerable portion of invertebrate drift among moss-rich patches within a karst hydrosystem

Meiofauna constitute a considerable portion of invertebrate drift among moss-rich patches within a karst hydrosystem

Temporal dynamics of seston: A recurring nighttime peak and seasonal shifts in composition in a stream ecosystem

Do tributaries affect loads and fluxes of particulate organic matter, inorganic sediment and wood? Patterns in an upland river basin in south-eastern Australia

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