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  • 1
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    Unbekannt
    Salinity experiments on Gammaridae species (2018)
    PANGAEA
    In:  Supplement to: Paiva, Filipa; Barco, Andrea; Chen, Yiyong; Mirzajani, Alireza; Chan, Farrah T; Lauringson, Velda; Baltazar-Soares, Miguel; Zhan, Aibin; Bailey, Sarah A; Javidpour, Jamileh; Briski, Elizabeta (2018): Is salinity an obstacle for biological invasions? Global Change Biology, 24(6), 2708-2720, https://doi.org/10.1111/gcb.14049
    Details
    Publikationsdatum: 2024-03-08
    Beschreibung: Invasions of freshwater habitats by marine and brackish species have become more frequent in recent years with many of those species originating from the Ponto-Caspian region. Populations of Ponto-Caspian species have successfully established in the North and Baltic Seas and their adjoining rivers, as well as in the Great Lakes-St. Lawrence River region. To determine if Ponto-Caspian taxa more readily acclimatize to and colonize diverse salinity habitats than taxa from other regions, we conducted laboratory experiments on 22 populations of eight gammarid species native to the Ponto-Caspian, Northern European and Great Lakes-St. Lawrence River regions. In addition, we conducted a literature search to survey salinity ranges of these species worldwide. Finally, to explore evolutionary relationships among examined species and their populations, we sequenced the mitochondrial cytochrome c oxidase subunit I gene (COI) from individuals used for our experiments. Our study revealed that all tested populations tolerate wide ranges of salinity, however, different patterns arose among species from different regions. Ponto-Caspian taxa showed lower mortality in fresh water, while Northern European taxa showed lower mortality in fully marine conditions. Genetic analyses showed evolutionary divergence among species from different regions. Due to the geological history of the two regions, as well as high tolerance of Ponto-Caspian species to fresh water whereas Northern European species are more tolerant of fully marine conditions, we suggest that species originating from the Ponto-Caspian and Northern European regions may be adapted to freshwater and marine environments, respectively. Consequently, the perception that Ponto-Caspian species are more successful colonizers might be biased by the fact that areas with highest introduction frequency of NIS (i.e., shipping ports) are environmentally variable habitats which often include freshwater conditions that cannot be tolerated by euryhaline taxa of marine origin.
    Schlagwort(e): Anzali_P.maeoticus; Bandare Anzali, Iran; Chaboksar, Iran; Chaboskar_O.crassus; DATE/TIME; Description; Event label; Experimental treatment; Falckenstein_G.locusta; Falckenstein_G.salinus; Falckenstein, Germany; Gisom_O.crassus; Gisom, Iran; HAND; Havigh_O.crassus; Havigh, Iran; Helgoland_G.locusta; Helgoland_G.salinus; Helgoland, North Sea; Identification; Individuals; Jafrud_P.maeoticus; Jafrud, Iran; Jones-Beach_G.fasciatus; Jones Beach, Port Weller, Lake Ontario, Canada; Kiel_G.oceanicus; Kiel_G.salinus; Kiel, Germany; Kronenloch_G.zaddachi; Kronenloch, Germany; Liu_G.tigrinus; Liu, Estonia; Mitchell's Bay, Lake St. Clair, Canada; Mitchells-Bay_G.fasciatus; Paernu_G.tigrinus; Pärnu, Estonia; Port-Colborne_G.fasciatus; Port Colborne, Lake Erie, Canada; Salinity; Sample code/label; Sampling by hand; Shafarud_P.maeoticus; Shafarud, Iran; Species; Travemuende_G.salinus; Travemuende_G.tigrinus; Travemünde, Germany; Treatment; Warnemuende_G.locusta; Warnemuende_G.zaddachi; Warnemünde, Germany
    Materialart: Dataset
    Format: text/tab-separated-values, 38124 data points
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    DATA PANGAEA
  • 2
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    Unbekannt
    Beyond propagule pressure: importance of selection during the transport stage of biological invasions (2018)
    ESA (Ecological Society of America)
    In:  Frontiers in Ecology and the Environment, 16 (6). pp. 345-353.
    Details
    Publikationsdatum: 2021-02-08
    Beschreibung: Biological invasions are largely considered to be a “numbers game”, wherein the larger the introduction effort, the greater the probability that an introduced population will become established. However, conditions during transport – an early stage of the invasion – can be particularly harsh, thereby greatly reducing the size of a population available to establish in a new region. Some successful non‐indigenous species are more tolerant of environmental and anthropogenic stressors than related native species, possibly stemming from selection (ie survival of only pre‐adapted individuals for particular environmental conditions) during the invasion process. By reviewing current literature concerning population genetics and consequences of selection on population fitness, we propose that selection acting on transported populations can facilitate local adaptation, which may result in a greater likelihood of invasion than predicted by propagule pressure alone. Specifically, we suggest that detailed surveys should be conducted to determine interactions between molecular mechanisms and demographic factors, given that current management strategies may underestimate invasion risk.
    Materialart: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    DOI: 10.1002/fee.1820
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
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    Specialization among amphipods: the invasiveGammarus tigrinushas narrower niche space compared to native gammarids (2016)
    Wiley
    In:  Ecosphere, 7 (6). e01306.
    Details
    Publikationsdatum: 2019-02-01
    Beschreibung: Human-mediated invasions of nonindigenous species are modifying global biodiversity. Despite significant interest in the topic, niche separation and specialization of invasive and closely related native sympatric species are not well understood. It is expected that combined use of various methods may reveal different aspects of niche space and provide stronger evidence for niche partitioning as compared to a single method. We applied the species marginality index (OMI) and species distribution modeling (SDM) in the northern Baltic Proper to determine (1) if environmental niche spaces at habitat scale differ between taxonomically and functionally closely related invasive and native gammarid species, and (2) whether the observed pattern relates to the species distribution overlap. Both methods agreed in notably narrower and more segregated realized niche of invasive Gammarus tigrinus compared to the studied native gammarids. Among native species, the distribution of G. zaddachi overlapped the most with G. tigrinus. Our results confirm that widespread colonization does not require a wide niche of the colonizer, but may rather be a function of other biological traits and/or the saturation of the recipient ecosystem. The niche divergence and wider environmental niche space of native species are likely to safeguard their existence in habitats less suitable for G. tigrinus.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1002/ecs2.1306
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  • 4
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    Which environmental scales and factors matter for mesozooplankton communities in a shallow brackish water ecosystem? (2016)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 38 (1). pp. 139-153.
    Details
    Publikationsdatum: 2019-02-01
    Beschreibung: Aquatic invertebrate communities are influenced by interactions between the abiotic and biotic environment at multiple spatial and temporal scales. Studies of mesozooplankton community patterns in relation to spatial and temporal scales are rare. In this study, we examined scale-specific variability of mesozooplankton in the shallow coastal Baltic Sea and related this variability to key environmental proxies. Seasonality defined the majority of variability in taxonomic composition and abundance patterns, as well as in aggregated parameters of zooplankton. However, these properties also varied spatially at a large, 100-km scale. The variability in all properties except taxonomic composition was negligible at the smaller spatial scale. Taxonomic richness increased until moderate levels of total abundance, whereas peak blooms were always characterized by higher dark diversity. Shannon diversity was unrelated to total abundance. Observed spatio-temporal patterns were strongly related to abiotic forcing and uncoupled from phytoplankton standing stock and primary production. Results show the importance of seasonality over spatial variability and abiotic factors over phytoplankton variability for sub-boreal brackish coastal mesozooplankton at the spatial scales studied. Information loss from spatial generalization can be larger for taxonomic occurrences and rare species than for species abundances and aggregated community parameters such as total abundance or taxonomic richness.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/fbv111
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
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    Mussels of a marginal population affect the patterns of ambient macrofauna: A case study from the Baltic Sea (2016)
    Elsevier
    In:  Marine Environmental Research, 116 . pp. 10-17.
    Details
    Publikationsdatum: 2019-02-01
    Beschreibung: In contemporary ecosystems, organisms are increasingly confronted with suboptimal living conditions. We aimed to understand the role of ecosystem engineering species in suboptimal habitats from a population inhabiting the species range margin in naturally stressful conditions. We determined the impact of 2-4 cm sized patches of dwarfed mussels Mytilus trossulus close to its lower salinity limit in the North-Eastern Baltic Sea, on epibenthic community patterns. Mussels affected total macrofaunal abundance and biomass and the taxonomic and functional community structure based on abundances, as well as the species composition of macrofauna. Mussels did not affect ephemeral algae or sediment chlorophyll content, but increased the abundance, biomass, richness, and diversity of grazers, within a radius approximately twelve times the size of mussel patches. We can expect marginal populations of ecosystem engineers in suboptimal habitats to contribute to spatial heterogeneity in biotic patterns and eventual ecosystem stability.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.marenvres.2016.02.010
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
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    Is salinity an obstacle for biological invasions? (2018)
    Wiley
    Details
    Publikationsdatum: 2023-01-31
    Beschreibung: Invasions of freshwater habitats by marine and brackish species have become more frequent in recent years with many of those species originating from the Ponto-Caspian region. Populations of Ponto-Caspian species have successfully established in the North and Baltic Seas and their adjoining rivers, as well as in the Great Lakes-St. Lawrence River region. To determine if Ponto-Caspian taxa more readily acclimatize to and colonize diverse salinity habitats than taxa from other regions, we conducted laboratory experiments on 22 populations of eight gammarid species native to the Ponto-Caspian, Northern European and Great Lakes-St. Lawrence River regions. In addition, we conducted a literature search to survey salinity ranges of these species worldwide. Finally, to explore evolutionary relationships among examined species and their populations, we sequenced the mitochondrial cytochrome c oxidase subunit I gene (COI) from individuals used for our experiments. Our study revealed that all tested populations tolerate wide ranges of salinity, however, different patterns arose among species from different regions. Ponto-Caspian taxa showed lower mortality in fresh water, while Northern European taxa showed lower mortality in fully marine conditions. Genetic analyses showed evolutionary divergence among species from different regions. Due to the geological history of the two regions, as well as high tolerance of Ponto-Caspian species to fresh water, whereas Northern European species are more tolerant of fully marine conditions, we suggest that species originating from the Ponto-Caspian and Northern European regions may be adapted to freshwater and marine environments, respectively. Consequently, the perception that Ponto-Caspian species are more successful colonizers might be biased by the fact that areas with highest introduction frequency of NIS (i.e., shipping ports) are environmentally variable habitats which often include freshwater conditions that cannot be tolerated by euryhaline taxa of marine origin.
    Materialart: Article , PeerReviewed
    Format: text
    Format: text
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