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    Interactive effects of temperature and salinity on shell formation and general condition in Baltic Sea Mytilus edulis and Arctica islandica (2012)
    Inter Research
    In:  Aquatic Biology, 14 (3). pp. 289-298.
    Details
    Publikationsdatum: 2019-09-24
    Beschreibung: Stress often induces metabolically expensive countermeasures. Bivalve shell production is costly and can thus be indirectly impacted by environmental stress. Suboptimal salinity and temperature may constitute stressors that allocate energy away from shell production to cellular processes such as osmoregulation or to the repair of cellular damage. In the course of climate change, water temperatures of the Baltic Sea are predicted to increase, and salinity is predicted to regionally decrease. These shifts may lead to increased stress for temperate marine species adapted to relatively cool water temperatures and high salinity conditions. To better understand the importance of climate change-related stress, we assessed the isolated and interactive effects of salinity and temperature on shell increment (cumulative growth: shell), cellular oxidative stress (accumulation of oxidized lipids and proteins: lipofuscin), instantaneous physiological condition (condition index: CI), and mortality of young Mytilus edulis and Arctica islandica from the western Baltic Sea. Temperature and salinity interactively affected shell increment, lipofuscin accumulation, and mortality of M. edulis as well as shell increment of A. islandica. Shell increment of M. edulis was less affected by hyposalinity than shell increment of A. islandica. In both species the CI decreased and lipofuscin accumulation increased with increasing temperature. Lipofuscin accumulation negatively correlated with shell increment in M. edulis. We conclude that Baltic Sea populations of ecologically relevant bivalve species may experience severe stress by the predicted regional scenario of warming and desalination if evolutionary adaptation does not happen at a similar rate.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.3354/ab00405
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 2
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    Salinity Driven Selection and Local Adaptation in Baltic Sea Mytilid Mussels (2021)
    Frontiers
    Details
    Publikationsdatum: 2024-02-07
    Beschreibung: Baltic blue mussels can colonise and dominate habitats with far lower salinity (〈 10 psu) than other Mytilus congeners. Pervasive gene flow was observed between Western Baltic Mytilus edulis living at high salinity conditions and Eastern Baltic M. trossulus living at lower salinites, with highest admixture proportions within a genetic transition zone located at intermediate salinities (Darss Sill area). Yet, we do not understand the impacts of low salinity on larval performance, and how salinity may act as an early selective pressure during passive larval drift across salinity gradients. This study tested whether larvae originating from two different populations along the natural salinity cline in the Baltic Sea have highest fitness at their native salinities. Our results suggest that Eastern Baltic M. trossulus (Usedom, 7 psu) and Western Baltic M. edulis (Kiel, 16 psu) larvae display better performance (fitness components: growth, mortality, settlement success) when reared at their respective native salinities. This suggests that these populations are adapted to their local environment. Additionally, species diagnostic markers were used for genetic analyses of transition zone (Ahrenshoop, 11 psu) mussel larvae exposed to low salinity. This revealed that low salinity selection resulted in a shift towards allele frequencies more typical for Eastern Baltic M. trossulus. Thus, salinity acts as a selective pressure during the pre-settlement phase and can shape the genetic composition of Baltic mussel populations driving local adaptation to low salinity. Future climate change driven desalination, therefore, has the potential to shift the Baltic Sea hybrid gradient westward with consequences for benthic ecosystem structure.
    Materialart: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 3
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    Capacity for Cellular Osmoregulation Defines Critical Salinity of Marine Invertebrates at Low Salinity (2022)
    Frontiers
    Details
    Publikationsdatum: 2024-02-07
    Beschreibung: Low-salinity stress can severely affect the fitness of marine organisms. As desalination has been predicted for many coastal areas with ongoing climate change, it is crucial to gain more insight in mechanisms that constrain salinity acclimation ability. Low-salinity induced depletion of the organic osmolyte pool has been suggested to set a critical boundary in osmoconforming marine invertebrates. Whether inorganic ions also play a persistent role during low-salinity acclimation processes is currently inconclusive. We investigated the salinity tolerance of six marine invertebrate species following a four-week acclimation period around their low-salinity tolerance threshold. To obtain complete osmolyte budgets, we quantified organic and inorganic osmolytes and determined fitness proxies. Our experiments corroborated the importance of the organic osmolyte pool during low-salinity acclimation. Methylamines constituted a large portion of the organic osmolyte pool in molluscs, whereas echinoderms exclusively utilized free amino acids. Inorganic osmolytes were involved in long-term cellular osmoregulation in most species, thus are not just modulated with acute salinity stress. The organic osmolyte pool was not depleted at low salinities, whilst fitness was severely impacted. Instead, organic and inorganic osmolytes often stabilized at low-salinity. These findings suggest that low-salinity acclimation capacity cannot be simply predicted from organic osmolyte pool size. Rather, multiple parameters (i.e. osmolyte pools, net growth, water content and survival) are necessary to establish critical salinity ranges. However, a quantitative knowledge of cellular osmolyte systems is key to understand the evolution of euryhalinity and to characterize targets of selection during rapid adaptation to ongoing desalination.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
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