Abiotic features and macroinvertebrate colonization of the hyporheic zones of two tributaries of the river Elbe (Germany)

Winkelmann, Carola; Koop, Jochen H. E.; Benndorf, Jürgen

doi:10.1016/s0075-9511(03)80040-3

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…This was possibly the case for the comparison of total abundance, total biomass, and number of taxa. Together with similar epibenthic colonization, the basic structure of the hyporheic invertebrate communities did not differ (Winkelmann et al 2003).…”

Section: Discussionmentioning

confidence: 86%

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Finding appropriate reference sites in large-scale aquatic field experiments

et al. 2007

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Defining the reference condition is one of the most critical aspects of ecosystem investigations since it describes the baseline against which the experimental sites will be evaluated and compared. In large-scale ecosystem experiments, this reference is ideally another ecosystem which is similar to the experimental system. We investigated two streams for their potential as experimental sites for a full-size pairwise ecosystem experiment. Temporal (2 years) and spatial (pool, riffle) variabilities of abiotic factors and as biotic element the structure of the macroinvertebrate communities were investigated. Criteria of similarity that we applied at the two streams were:(1) high similarity in abiotic factors, (2) only small differences in the faunal assemblages (abundance structures, composition, feeding types), and (3) that the differences between the two systems should not exceed the temporal and spatial differences within each system. Among the abiotic factors investigated, only the inorganic nutrients (nitrate and soluble reactive phosphorus), major ions (magnesium, calcium), electric conductivity, and pH showed significant differences between the two streams. Discharge rate, current velocity, temperature, and oxygen concentrations did not significantly differ between the streams. Also, the community structure did not differ in species richness, abundance, and biomass; and only small differences in dominance structure and feeding-type composition were observed. The differences between habitats within each stream were always higher than those between the streams. Thus, both the streams are characterized by a similar structure of the macroinvertebrate community, a main component of the stream food-web, which make them suitable for a full size pairwise ecosystem experiment. The present case study can form a basis for other full-size field experiments.

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Section: Discussionmentioning

confidence: 86%

“…Groundwater contribution to base flow is low because of the bedrock substrate (Winkelmann et al 2003). The average retention time of the water in the catchment of the experimental stream is 28 years and that of the reference stream 22.5 years.…”

Section: Study Sitementioning

confidence: 96%

Finding appropriate reference sites in large-scale aquatic field experiments

et al. 2007

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“…Abundances were expressed as number of individuals per litre substrate (Maridet et al, 1992;Fraser & Williams, 1997), per 9 l substrate (Adkins & Winterbourn, 1999), per dm 3 substrate (Scarsbrook & Halliday, 2002;Weigelhofer & Waringer, 2003;Olsen & Townsend, 2005). Moreover, some authors divided substrate volume by height of the core section following Klemens (1983) to express abundances as number of individuals per m 2 (Winkelmann et al, 2003;Varricchione et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

A conceptual model for unbiased calculations of invertebrate abundances from freeze core samples

Huber

Hauer

2020

Hydrobiologia

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Freeze coring is a commonly used method for the investigation of the bed sediment fauna of rivers. It is considered to produce quantitative numbers of invertebrate abundance in different depth layers. Calculations of abundance use total volume of the freeze core sample as spatial reference. This definition of sample volume is incorrect. In the present, study freeze core samples are shown to consist of two parts: (1) a cylindrical inner core in which the pore water has turned into ice and (2) all parts of sediment, which protrude from this inner core. Invertebrates are fixed only within the inner core since the protruding parts contain no pores and therefore no invertebrate habitat. In samples from gravel rivers, the protruding parts form a considerable bias, which depends on the size of the core and the coarseness of the sediment. In the present study, total volume of individual core segments varied between 97 and 248% of actual sample volume. The inner core can be measured directly to avoid the bias. The procedure is proposed for future studies to produce unbiased, comparable values of invertebrate abundance and consequently reliable data on vertical distribution.

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“…There are several ways of expressing the density of benthos in sediments: number of individuals, which in fact is not density but abundance, in sampled sections of the same length (Efford, 1960;Ford, 1962;Dauer et al, 1987;Olafsson, 1992;Soumille and Thiery, 1997); relative (percentage) density in sampled sections (Takacs and Tokeshi, 1994;Soumille and Thiery, 1997;Rae, 2013), with some not always of equal length (Shiozawa and Barnes, 1977;Dauer et al, 1987;Van de Bund and Groenendijk, 1994); per unit surface area of bottom in sampling sections of the same length (Schiemer et al, 1969;Milbrink, 1973;Beckett et al, 1992;Soumille and Thiery, 1997); per unit surface area of bottom in samples of unequal length (Kajak and Dusoge, 1971;Nalepa and Robertson, 1981;Newrkla and Wijegoonawardana, 1987;Kornijo´w, 1997;Martin et al, 1999Martin et al, , 2005Narita, 2006;Persson and Svensson, 2006;Cardoso et al, 2010;Urban-Malinga et al, 2014); per unit volume of sediment in sampling sections of unequal or equal lengths (Heuschele, 1982;Strayer, 1985;Strommer and Smock, 1989;Mcelravy and Resh, 1991;Maridet et al, 1992;Winkelmann et al, 2003;Kornijo´w and Pawlikowski, 2015).…”

Section: Introductionmentioning

confidence: 99%

A common error in calculating density of invertebrates in sediment core sections of unequal lengths

Kornijów

Pawlikowski

2016

Ann. Limnol. - Int. J. Lim.

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In benthic studies, an absolute measure of invertebrate density with depth in the sediment is desirable. It can be expressed as invertebrates per unit of sediment volume or invertebrates per unit of sediment surface area. Calculations are often distorted, however, by whether the core is divided into unequal or equal segments. This is demonstrated in a study conducted in the Vistula Lagoon (South Baltic Sea). We collected 30 cores, and performed an analysis of distribution of invertebrates along the sediment profiles divided into sections of different lengths, or of equal lengths. In both cases, animal density/biomass was calculated both per unit area (m 2) and per unit volume (L). When cores are divided into equal sections, various ways of data computing do not affect the final results. If, for any reason, the cores are divided into sections varying in length, the only way to obtain an accurate measure of invertebrate distribution in the sediment profile is to express the data per unit volume. In many studies, calculations have been made per unit area using unequal segments, and these calculations are erroneous. The same error is made if density is expressed as the percentage contribution of the numbers/biomass or number of specimens recorded in particular unequal sections.

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Abiotic features and macroinvertebrate colonization of the hyporheic zones of two tributaries of the river Elbe (Germany)

Cited by 9 publications

References 26 publications

Finding appropriate reference sites in large-scale aquatic field experiments

Finding appropriate reference sites in large-scale aquatic field experiments

A conceptual model for unbiased calculations of invertebrate abundances from freeze core samples

A common error in calculating density of invertebrates in sediment core sections of unequal lengths

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