Spatio-temporal overlap of the alien invasive ctenophore Mnemiopsis leidyi and ichthyoplankton in the Bornholm Basin (Baltic Sea)

Schaber, Matthias; Haslob, Holger; Huwer, Bastian; Harjes, Anne; Hinrichsen, Hans‐Harald; Storr-Paulsen, Marie; Schmidt, Jörn O.; Voss, R.; Neumann, Viola; Köster, Fritz

doi:10.1007/s10530-011-9936-7

Cited by 19 publications

(16 citation statements)

References 46 publications

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“…In the Black Sea, M. leidyi was collected only above the steep thermocline at 20 to 30 m in summer; importantly, the oxycline was much deeper (50−100 m; Mutlu 1999), suggesting that low oxygen did not determine the ctenophore depth distribution there. In the central Baltic Sea, peak densities of M. leidyi were at 62.5 to 72.5 m, below the pycnocline at ~55 m during the day (Schaber et al 2011); ctenophores may have avoided the cold waters (≤5°C) above the pycnocline, because DO (~2−6 ml l −1 ) and salinities above (~8) and below (~16) the pycnocline should not have restricted them. Thus, various factors may affect the vertical distribution of M. leidyi.…”

Section: Vertical Distributions Of Ctenophores Medusae and Copepodsmentioning

confidence: 99%

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Fine-scale vertical distributions of Mnemiopsis leidyi ctenophores: predation on copepods relative to stratification and hypoxia

Purcell¹,

Decker²,

Breitburg³

et al. 2014

Mar. Ecol. Prog. Ser.

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Plankton concentrations near discontinuities in the water column (clines) are believed to be important for intensifying trophic interactions; however, evidence for increased feeding by predators at clines in situ is scarce. Here we demonstrate enhanced feeding near pycnoclines by a voracious planktivore, the ctenophore Mnemiopsis leidyi. To determine their feeding relative to stratification, we quantified temperature, salinity, dissolved oxygen concentration (DO), densities of ctenophores and copepods at 1 to 2 m depth intervals, and gut contents of ctenophores collected by depth layer at stations in a tributary and in the mainstem Chesapeake Bay during summer from 1999 to 2001. We tested the null hypotheses that patterns in the tributary and the bay were similar and that ctenophore vertical distributions and feeding were independent of the vertical distributions of the physical variables, stratification, and copepods. We rejected all null hypotheses. Ctenophores and copepods had peak densities below the pycnocline in the weakly stratified tributary, where DO was above 2 mg l −1 throughout the water column; by contrast, they were more concentrated above the strong pycnocline and near-anoxic waters at ~11 m in the bay. Predation on copepods by ctenophores was highest where both populations were concentrated. Our results illustrate the importance of stratification to planktonic trophic interactions for M. leidyi, which thrives in anthropogenically degraded waters and now is established throughout European seas, where it can negatively affect planktonic food webs and fisheries.KEY WORDS: Jellyfish · Aggregation · Cline · Acartia · Zooplankton · Low dissolved oxygen · Feeding · Clearance · Chesapeake Bay (USA) Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 500: [103][104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119][120] 2014 tion of organisms and enhanced feeding at clines abounds in the laboratory (e.g. Woodson & McManus 2007); however, evidence of increased feeding in situ is rare (see Möller et al. 2012).Ctenophores, medusae, and copepods are known to accumulate at density discontinuities in the water column (Arai 1992, Graham et al. 2001, Malej et al. 2007, Jacobsen & Norrbin 2009, Frost et al. 2010. Arai (1992) concluded that Sarsia tubulosa hydromedusae behaviorally aggregate at salinity discontinuities. Similarly, hydromedusae of Nemopsis bachei remain in discontinuities created by salinity gradients with and without thin layers of algae and copepods (Frost et al. 2010). Most Aurelia spp. medusae occur at clines (Rakow & Graham 2006, Malej et al. 2007. Acartia tonsa copepods also aggregate in layers ). Thus, gelatinous predators and their prey actively aggregate at density discontinuities. Although medusae and their feeding increase at clines (Frost et al. 2010), we know of no previous studies on ctenophore feeding in situ in relation to stratification.The mesohaline Chesapeake Bay (USA) and its tributaries can have ...

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Section: Vertical Distributions Of Ctenophores Medusae and Copepodsmentioning

confidence: 99%

“…Stratification of the water column and layering of the organisms have been studied extensively in the field with closing nets (e.g. Keister et al 2000, Schaber et al 2011 and at finer scales with acoustic, particlecounting, and camera systems (e.g. Cheriton et al 2007, Möller et al 2012, Bi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Fine-scale vertical distributions of Mnemiopsis leidyi ctenophores: predation on copepods relative to stratification and hypoxia

Purcell¹,

Decker²,

Breitburg³

et al. 2014

Mar. Ecol. Prog. Ser.

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“…Recent warming has also been associated with an increase in invasive species in the Baltic region (Ojaveer et al 2011). An example of this is the relatively recent increase in Mnemiopsis leidyi, a ctenophore that will compete with ichthyoplankton for zooplankton prey resources and that can pose a direct predation threat for pelagic fish eggs and larvae (Haslob et al 2007;Schaber et al 2011). …”

Section: Discussionmentioning

confidence: 99%

Temperature effects on vital rates of different life stages and implications for population growth of Baltic sprat

et al. 2012

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Baltic sprat (Sprattus sprattus balticus S.) is a key species in the pelagic ecosystem of the Baltic Sea. Most stocks of small pelagic species are characterized by natural, fishery-independent fluctuations, which make it difficult to predict stock development. Baltic sprat recruitment is highly variable, which can partly be related to climate-driven variability in hydrographic conditions. Results from experimental studies and field observations demonstrate that a number of important life history traits of sprat are affected by temperature, especially the survival and growth of early life stages. Projected climate-driven warming may impact important processes affecting various life stages of sprat, from survival and development during the egg and larval phases to the reproductive output of adults. This study presents a stage-based matrix model approach to simulate sprat population dynamics in relation to different climate change scenarios. Data obtained from experimental studies and field observations were used to estimate and incorporate stage-specific growth and survival rates into the model. Model-based estimates of population growth rate were affected most by changes in the transition probability of the feeding larval stage at all temperatures (?0, ?2, ?4, ?6°C). The maximum increase in population growth rate was expected when ambient temperature was elevated by 4°C. Coupling our stage-based model and more complex, biophysical individual-based models may reveal the processes driving these expected climate-driven changes in Baltic Sea sprat population dynamics.

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“…The vertical distribution of M. leidyi showed that it was mostly confined to water layers below the permanent halocline, and Schaber et al [32] suggested that food limitation plays a major role in the decline of M. leidyi in the central Baltic Sea during summer, and while they considered a self-sustaining population unlikely, they stated that M. leidyi is "most likely re-introduced" every year. Schaber et al [33] investigated the temporal and spatial overlap of M. leidyi and eggs and larvae of cod and sprat in order to assess the potential impact of the new invader on two of the most important Baltic fish stocks. The spatial overlap between M. leidyi and fish eggs and larvae was found to be low for most of the period observed, although situations with high overlaps were detected, for example for sprat larvae and cod eggs in spring, but on a general level it was concluded that M. leidyi "presently does not have a strong impact" [33].…”

Section: Occurrence In the Central Baltic Seamentioning

confidence: 99%

“…Schaber et al [33] investigated the temporal and spatial overlap of M. leidyi and eggs and larvae of cod and sprat in order to assess the potential impact of the new invader on two of the most important Baltic fish stocks. The spatial overlap between M. leidyi and fish eggs and larvae was found to be low for most of the period observed, although situations with high overlaps were detected, for example for sprat larvae and cod eggs in spring, but on a general level it was concluded that M. leidyi "presently does not have a strong impact" [33]. …”

Section: Occurrence In the Central Baltic Seamentioning

confidence: 99%

Invasion of Danish and Adjacent Waters by the Comb Jelly Mnemiopsis leidyi—10 Years After

Riisgård¹

2017

OJMS

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The invasive ctenophore Mnemiopsis leidyi, which comes from North America's east coast, was observed in Danish waters for the first time in 2007. Since then, the new invader has every summer spread in Danish and adjacent waters (i.e. North Sea, Limfjorden, Skagerrak, Kattegat, Belt Sea, Baltic Sea). The invasive comb jelly has apparently come to stay, as it has no effective enemies.Possible harmful effects of M. leidyi which feeds voraciously on zooplankton, fish eggs and larvae, have so far not been thoroughly studied in Danish waters, although dedicated attempts have been made in Limfjorden and in the central Baltic Sea. Over the last 10 years, the Danish national environmental monitoring program did not include gelatinous zooplankton, but new initiatives have been recently taken. A brief overview of our current knowledge on the impact of M. leidyi in Danish waters is given here.

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Spatio-temporal overlap of the alien invasive ctenophore Mnemiopsis leidyi and ichthyoplankton in the Bornholm Basin (Baltic Sea)

Cited by 19 publications

References 46 publications

Fine-scale vertical distributions of Mnemiopsis leidyi ctenophores: predation on copepods relative to stratification and hypoxia

Fine-scale vertical distributions of Mnemiopsis leidyi ctenophores: predation on copepods relative to stratification and hypoxia

Temperature effects on vital rates of different life stages and implications for population growth of Baltic sprat

Invasion of Danish and Adjacent Waters by the Comb Jelly Mnemiopsis leidyi—10 Years After

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