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Reproductive biology of Dikerogammarus haemobaphes: an invasive gammarid (Crustacea: Amphipoda) colonizing running waters in Central Europe

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Dikerogammarus haemobaphes is a Ponto-Caspian gammarid that has invaded vast areas in Central and Western Europe. Our paper is a first presentation of its life history features in an invaded region. The study was conducted in the Vistula River in Poland from autumn 2003 to autumn 2005 in two sites differing in hydrological conditions with one being water reservoir. The results showed that the reproductive period lasted 8months from April till October in both sites. Three generations per 1year were observed: autumn (overwintering), spring and summer. Ten cohorts per year were distinguished. The individuals from the reservoir were much bigger than those from the other site. The fecundity of those specimens was also higher and they laid 52 eggs per clutch in average in comparison with 37 eggs in the river itself. The strong relationship between the number of embryos (in developmental stage 2) per clutch and the length of females was noticed. The overall mean egg size of stage 2 of D. haemobaphes was 0.430±0.029mm which is smaller than noted for native species such as Gammarus fossarum. A potentially high reproductive capacity, comparatively small eggs, short time of eggs’ development, fast reaching sexual maturation, short life span, tolerance to a wide range of environmental conditions, all promote the invasion of this Ponto-Caspian gammarid in freshwater ecosystems of the temperate climate zone.
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... For example, juveniles' dominance indicates rapid growth of the population (Dobrzycka-Krahel et al. 2019). The reproductive potential of amphipods is related to body size, the number and size of eggs and embryos, the length of the reproductive period, the time of maturation and voltinism (San Vicente 2018; Bacela et al. 2009;Grabowski et al. 2007a;Bacela, Konopacka 2005;Sainte-Marie 1991). Life history traits are also dependent on other biological (competition and predation) and environmental factors (temperature, food, habitat, water quality and geographical location) (Poznańska-Kakareko et al. 2021;Grabowski et al. 2007a;2007b;Pöckl 2007;Kley, Maier 2006;Panov, McQueen 1998;Sutcliffe 1993;Sainte-Marie 1991;Welton, Clarke 1980;Nilsson 1977;Hynes 1955). ...
... Females prevailed, especially in the reproductive period (Figure 5,7,9), thus indicating a high potential to increase the population in a short time, as has been observed in studies on alien species. For example, in the aggressive alien species Dikerogammarus villosus in the Moselle River, France, D. haemobaphes in the Vistula River, Poland and P. robustoides in the Gulf of Finland (Neva estuary) in north-western Russia, females were more prevalent during the reproductive period, making a significant contribution to the development of the population with a large number of eggs and juveniles in the spring generation (Berezina 2016;Bacela et al. 2009;Devin et al. 2004). ...
... Other invasive alien species in freshwaters are also characterized by a high number of eggs per brood. The size and number of eggs will also depend on the life strategy of the species (Kurina 2017;Bacela et al. 2009;Grabowski et al. 2007a;Kley, Maier 2006;Pöckl 2007;Nelson 1980). ...
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Population structure, reproductive parameters and other life history traits are among the main preconditions for alien amphipods’ successful invasion. In the freshwaters of Northern Europe, i.e. Latvia, the overall life history of alien Ponto-Caspian amphipods is little known. Furthermore, the population structure and reproductivity of native Gammarus pulex have not been studied in Latvian freshwaters. The aim of the study was to describe the life history of Gammarus varsoviensis, Pontogammarus robustoides and the coexistent G. pulex. Their population structure, reproductive period and fecundity in the Daugava River were evaluated as part of this study from 2017 to 2019. The results revealed that the reproductive period of G. varsoviensis and P. robustoides lasted from four to five months, with up to three generations per year and a high proportion of juveniles. The average number of eggs for G. varsoviensis was 31 (maximum: 69) and for P. robustoides 28 (maximum: 81), with ovigerous females of both species being an average of 11.3 mm. Gammarus pulex had one generation per year with a high proportion of juveniles. The average number of eggs per brood was 27 (maximum: 41) with the average size of ovigerous females being 10.7 mm.
... In our study, the maximum TBL of females and males were higher at the Medsave site than at the Jarun site. It was suggested that the significant differences in the length of individuals of Dikerogammarus haemobaphes (Eichwald, 1841) (Amphipoda) inhabiting two sites with different hydrological characteristics could be due to different hydrological conditions and different predation pressures [81]. In our study, the water levels and discharges of the Sava River were similar at the two sampling sites. ...
... When we observed only sexually mature individuals, the lowest mean TBL was in autumn for most age groups (females at the Medsave site and males at the Medsave and Jarun sites). The opposite pattern was observed in the study on adult individuals of the amphipod Dikerogammarus haemobaphes, who had the lowest size in summer and the highest size in autumn [81]. ...
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Estimating the growth and population dynamics of crustaceans is important for understanding the role of species in ecosystems and for conservation and monitoring purposes. This study investigated temporal and spatial variation in population dynamics (growth rate, instantaneous mortality rates, and longevity) of the stygophilous freshwater amphipod Synurella ambulans (F. Müller, 1846), and influencing environmental factors. Seasonal sampling was conducted from December 2018 to October 2019 at two sampling sites (Jarun and Medsave) along the Sava River in northwestern Croatia. A Bhattacharya cohort analysis was applied to the length-frequency data using the FISAT software package. At least four cohorts were distinguished during the year. The possible influence of environmental factors on growth parameters was investigated using Canonical Correspondence Analysis (CCA), which revealed that the important environmental factors influencing S. ambulans abundance were water temperature and dissolved oxygen concentration. The average total body length (TBL) of females was 4.25 mm, while the TBL of males was 3.34 mm. The asymptotic length (L∞) and growth coefficient (K) were estimated to be 6.30 mm and 0.92 year−1 for females and 5.40 mm and 0.59 year−1 for males, respectively, at the Jarun site. L∞ and K were estimated to be 7.20 mm and 0.34 year−1, respectively, for females and 4.00 mm and 1.20 year−1, respectively, for males at the Medsave site. Estimated total mortality (Z) for each sex had higher values for males than females at both sampling sites. The lack of ecological knowledge on S. ambulans populations and relationships with invertebrate communities in the hyporheic zone of the large river ecosystems emphasises the importance of a detailed study for protecting this species and its vulnerable ecotonal groundwater-connected environment.
... Only June of all summer months was the hottest (Fig. 2, Tab. 2) (Latvian Environment, Geology and Meteorology Centre 2020). It has been shown that the life history traits of various species of amphipod (induction of reproduction, size of body, number of generations per year, number of eggs, maturation time, and choice or migration of habitat) depend on the water temperature and food (Berezina 2016, Bacela et al. 2009, Bacela & Konopacka 2005, Pöckl et al. 2003, Panov & McQueen 1998, Sutcliffe 1993, Sainte-Marie 1991. ...
... As similar to G. varsoviensis the population structure and breeding of P. robustoides during the study can explain by the water temperature. For example, in the population of alien amphipod Dikerogammarus haemobaphes in the Vistula River, from egg fertilization to release of juveniles took around three weeks from 10°C to 13°C in April (Bacela et al. 2009). But in our study, the average water temperature was from 8.2°C in April to 11.5°C in May, and only at the beginning of June it was 14.4°C. ...
... The demon shrimp has a high potential for invasion (Grabowski et al. 2007a;Bacela et al. 2009;Bacela-Spychalska and Van der Velde 2013). However, another invasive species of the genus Dikerogammarus, the so-called killer shrimp D. villosus, was often considered a more successful invader (Dick et al. 2002;Rewicz et al. 2015;Kobak et al. 2016), attracting more scientific attention than D. haemobaphes. ...
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... One example of just such an invader is Dikerogammarus haemobaphes (Eichwald, 1841), also referred to as the "demon shrimp". D. haemobaphes originates from the Ponto-Caspian region, however the species has been documented to progressively move across much of Central and Western Europe over recent years ( Bacela et al. 2009). In the United Kingdom, it was first recorded in 2012 in the river Severn ( Constable and Birkby 2016;Aldridge 2018), and has since spread rapidly through many canal and river networks across the country (Constable and Birkby 2016). ...
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