While aquatic invasive predators are among the most impactful trophic groups, we lack understanding of whether alternative food resources mediate adverse predatory effects and stabilise native prey communities. Here, we use comparative functional responses to examine the influence of alternative food resources (Fucus sp.) on predator-prey interaction strengths from three gammarid crustaceans, with one native (Gammarus locusta) and two existing and emerging invasive (Gammarus tigrinus, Pontogammarus maeoticus, respectively) species, towards larval chironomid prey. All gammarids...
Stable isotope analysis (SIA) has become a pivotal method in food web and ecological research, leading to the establishment of the research field “stable isotope ecology”. We conducted the first systematic review of stable isotope studies in this field in the Baltic Sea macro-region (Eglite et al. 2022). The meta-data collection provided here includes the information extracted from all 164 studies identified in the systematic review across various dimensions (topic, space, time, taxonomic, and technical...
Niche partitioning between planktivorous fish in the pelagic Baltic Sea assessed by DNA metabarcoding, qPCR and microscopy: Data and AnalysesAndreas Novotny, Kinlan Jan, Jan Dierking & Monika Winder
Marine communities undergo rapid changes because of human-induced ecosystem pressures. The Baltic Sea pelagic food web has experienced several regime shifts during the past century, resulting in a system where competition between planktivorous mesopredators is assumed to be high. While the two clupeids sprat and herring reveal signs of competition, the stickleback population has increased drastically during the past decades. Here, we investigate diet overlap between the three dominating planktivorous fish in the Baltic Sea,...
Organisms living on the seafloor are subject to encrustations by a wide variety of animal, plants, and microbes. Sea urchins, however, thwart this covering. Despite having a sophisticated immune system, there is no clear mechanism that allows sea urchins to remain clean. Here, by using CRISPR/Cas9, we test the hypothesis that pigmentation biosynthesis in sea urchin spines influences their interactions with microbes in vivo. We have three primary findings. First, the microbiome of sea urchin...
Climate change is impacting virtually all marine life. Adaptation strategies will require a robust understanding of the risk to species and ecosystems and how those propagate to human societies. We develop a unified and spatially explicit index to comprehensively evaluate the climate risks to marine life. Under high emissions (SSP5-8.5), almost 90% of ~25,000 species are at high or critical risk, with species at risk across 85% of their native distributions. One-tenth of the ocean...
DNA-metabarcoding reveals the importance of gelatinous zooplankton in the diet of Pandalus borealis, a keystone species in the ArcticPaulina Urban, Kim Præbel, Shripathi Bhat, Jan Dierking & Owen S. Wangensteen
Information about the dietary composition of species is crucial to understand their position and role in the food web. Stomach content analysis (SCA) and stable isotope analysis (SIA) are commonly used to study marine trophic relationships. SCA can provide high taxonomic resolution but requires taxonomic expertise and frequently underestimates digestible taxa. SIA provides a time-integrated view of the dietary sources but often lacks in taxonomic resolution. The use of molecular approaches such as DNA-metabarcoding may...
Bacterial symbionts are functionally integral to animal reproduction and development, some of which have evolved additional mechanisms to override these host programs. One habitat that is increasingly recognized to contain phylogenetically related lineages of reproductive manipulators is the ocean. The reproduction of marine invertebrates often occurs by free-spawning instead of by the physical contact of copulation in terrestrial systems. We developed an integrated model to understand whether and when microbes that manipulate host reproduction by...
GEOMAR Helmholtz Centre for Ocean Research Kiel7
National Oceanography Centre1
Queen's University Belfast1
UiT The Arctic University of Norway1
University of Freiburg1
Purdue University West Lafayette1
GEOMAR - Helmholtz Centre for Ocean Research Kiel1
University College London1
Jacobs University Bremen gGmbH1