Life‐cycle, drift and production of <i>Gammarus pulex</i> L. (Amphipoda) in a Danish spring

Iversen, Torben Moth; Jessen, J. Heinrich

doi:10.1111/j.1365-2427.1977.tb01676.x

Cited by 54 publications

(48 citation statements)

References 13 publications

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“…In our case, the maximal individual growth rate was 4.05% dry weight day −1 . The secondary production of G. fossarum in the Prosiečanka stream was similar as Iversen & Jessen (1977) found in G. pulex in the headwater streams. On the other hands P/B ratios were significantly different.…”

Section: Discussionsupporting

confidence: 57%

Life history, secondary production and population dynamics of Gammarus fossarum (Koch, 1836) in a constant temperature stream

2012

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Population of the freshwater amphipod Gammarus fossarum was investigated in a calcareous stream with almost constant temperature (7-8• C) in the Chočské Vrchy Mts (West Carpathians, Slovakia). Quantitative samples of G. fossarum taken during 2005 showed population densities varying from 100 m −2 in August to 585 m −2 in late November. The population was split into juveniles, mature males, mature females without eggs and females with eggs. The percentage of juveniles (40-64%) was always the highest of any of the categories. Ovigerous females occurred throughout the year. The mean sex ratio was 1 : 2.4 (male: female), although its values varied considerably with the time of year. Breeding was continuous, although juvenile recruitment peaked in early spring, summer and early winter. Three discrete cohorts were distinguished from the size frequency distributions. The life span was 6-7 months and the individuals matured approximately in the half of life cycle. The mean fecundity was 9.6 embryos per brood. Variation in fecundity was mostly explained by size of the incubating females. The absolute growth of this species was best described by the Gompertz growth function. Relative growth rates (% body DM day −1 ) fluctuated in a nonlinear manner with size and age. The highest values of daily growth (2-4% of dry mass per day) were noted approximately in the half of life cycle. Annual production, estimated by the size-frequency method, was 1618.9 g dry mass m −2 and P/B ratio was 5.15.

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Section: Discussionsupporting

confidence: 57%

Life history, secondary production and population dynamics of Gammarus fossarum (Koch, 1836) in a constant temperature stream

2012

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“…The single report in the literature of a correlation between drift and production where both were simultaneously measured is that of Pearson and Kramer (1972), who found a direct correlation over a 2-year period for the caddisfly Oligophlebodes sigma in a Utah mountain stream. Iversen and Jessen (1977) reported drift and production for Gammarus pulex, but the nature of their data did not permit a test of correlation. Virtually no instance of drift having caused a depopulation in upstream reaches, even when drift rates were high and upstream reaches were examined, has been reported (Elliott 1967;Ulfstrand 1968;Schuhmacher 1969;Miiller 1974).…”

Section: Discussionmentioning

confidence: 99%

“…All weight units are dry weight. Iversen and Jessen (1977) reported 38 kg. ha-l for Gammurus pulex in a Danish spring, and Welton (1979) reported nearly 130 kg* ha-r for the same species in an English stream.…”

Section: Discussionmentioning

confidence: 99%

“…Amphipods frequently make up an important part of the stream fauna, particularly species of Gammarus, and have a high propensity to drift (Waters 1962a;Miiller 1963;Iversen and Jessen 1977). They also serve as a major item of fish diet where they occur in abundance (Hanson and Waters 1974), and one cstimate of production previously in the literature indicated high production (Tilly 1968).…”

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confidence: 99%

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Annual production and drift of the stream amphipod Gammarus pseudolimnaeus in Valley Creek, Minnesota1

Waters

Hokenstrom

1980

Limnology & Oceanography

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Annual production and drift of Gammarus pseudolimnaeus were measured in a 100‐m section of Valley Creek for the 5‐year period 1968–1973. Production was estimated by the procedure previously termed the “Hynes method,” herein proposed to be termed the “size‐frequency method.” Annual production was 271 and 231 kg·ha−1 (dry wt) in the first 2 years but declined subsequently to a low of 64 kg·ha−1, apparently the result of a severe siltation. Annual mean daily drift corresponded, being high at 41 and 46 g·d−1·m−3 s−1 in the first 2 years, but only about 7 and 11 in the last 2 years. Mean annual standing stock was also high in the first 2 years (47 and 35 kg·ha−1) but substantially lower n the last 2 years (11 and 17); mean annual density was 7,176 and 6,849·m−2 in the first 2 years and 1,586 and 2,363·m−2 in the last 2 years. Annual P:B ratios were 5.7–6.6 over the 5‐year period, with an average of 6.0.

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“…S2 for exact dates for both sites) and checked it against previous descriptions of the life cycle of gammarids (e.g. Hynes, 1955;Iversen and Jessen, 1977;Pöckl et al, 2003). Water temperature was measured daily.…”

Section: Experimental and Field Methodsmentioning

confidence: 99%

From population-level effects to individual response: modelling temperature dependence in Gammarus pulex

Moenickes

Schneider

Mühle

et al. 2011

Journal of Experimental Biology

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SUMMARYPopulation-level effects of global warming result from concurrent direct and indirect processes. They are typically described by physiologically structured population models (PSPMs). Therefore, inverse modelling offers a tool to identify parameters of individual physiological processes through population-level data analysis, e.g. the temperature dependence of growth from size-frequency data of a field population. Here, we make use of experiments under laboratory conditions, in mesocosms and field monitoring to determine the temperature dependence of growth and mortality of Gammarus pulex. We found an optimum temperature for growth of approximately 17°C and a related temperature coefficient, Q 10 , of 1.5°C -1 , irrespective of whether we classically fitted individual growth curves or applied inverse modelling based on PSPMs to laboratory data. From a comparison of underlying data sets we conclude that applying inverse modelling techniques to population-level data results in meaningful response parameters for physiological processes if additional temperature-driven effects, including within-population interaction, can be excluded or determined independently. If this is not the case, parameter estimates describe a cumulative response, e.g. comprising temperature-dependent resource dynamics. Finally, fluctuating temperatures in natural habitats increased the uncertainty in parameter values. Here, PSPM should be applied for virtual monitoring in order to determine a sampling scheme that comprises important dates to reduce parameter uncertainty. Supplementary material available online at

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Life‐cycle, drift and production of Gammarus pulex L. (Amphipoda) in a Danish spring

Cited by 54 publications

References 13 publications

Life history, secondary production and population dynamics of Gammarus fossarum (Koch, 1836) in a constant temperature stream

Life history, secondary production and population dynamics of Gammarus fossarum (Koch, 1836) in a constant temperature stream

Annual production and drift of the stream amphipod Gammarus pseudolimnaeus in Valley Creek, Minnesota1

From population-level effects to individual response: modelling temperature dependence in Gammarus pulex

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