6 Works

Disentangling temporal food web dynamics facilitates understanding of ecosystem functioning

Susanne Kortsch, Romain Frelat, Laurene Pecuchet, Pierre Olivier, Ivars Putnis, Erik Bonsdorff, Henn Ojaveer, Iveta Jurgensone, Solvita Strāķe, Gunta Rubene, Ēriks Krūze & Marie C. Nordström
Studying how food web structure and function varies through time represents an opportunity to better comprehend and anticipate ecosystem changes. Yet, temporal studies of highly resolved food web structure are scarce. With few exceptions, most temporal food web studies are either too simplified, preventing a detailed assessment of structural properties, or binary, missing the temporal dynamics of energy fluxes among species. Using long-term, multi-trophic biomass data coupled with highly resolved information on species feeding relationships,...

Data from: Microbiome symbionts and diet diversity incur costs on the immune system of insect larvae

Indrikis Krams, Sanita Kecko, Priit Jõers, Giedrius Trakimas, Didzis Elferts, Ronalds Krams, Severi Luoto, Markus J. Rantala, Inna Inashkina, Dita Gudrā, Dāvids Fridmanis, Jorge Contreras-Garduño, Lelde Grantiņa-Ieviņa & Tatjana Krama
Communities of symbiotic microorganisms that colonize the gastrointestinal tract play an important role in food digestion and protection against opportunistic microbes. Diet diversity increases the number of symbionts in the intestines, a benefit that is considered to impose no cost for the host organism. However, less is known about the possible immunological investments that hosts have to make in order to control the infections caused by symbiont populations that increase due to diet diversity. By...

Data from: Hypoxic areas, density-dependence and food limitation drive the body condition of a heavily exploited marine fish predator

Michele Casini, Filip Käll, Martin Hansson, Maris Plikshs, Tatjana Baranova, Olle Karlsson, Karl Lundström, Stefan Neuenfeldt, Anna Gardmark & Joakim Hjelm
Investigating the factors regulating fish condition is crucial in ecology and the management of exploited fish populations. The body condition of cod (Gadus morhua) in the Baltic Sea has dramatically decreased during the past two decades, with large implications for the fishery relying on this resource. Here, we statistically investigated the potential drivers of the Baltic cod condition during the past 40 years using newly compiled fishery-independent biological data and hydrological observations. We evidenced a...

Data from: Spatial contraction of demersal fish populations in a large marine ecosystem

Alessandro Orio, Ulf Bergström, Ann-Britt Florin, Andreas Lehmann, Ivo Šics & Michele Casini
Aim: The interdependencies between trophic interactions, environmental factors and anthropogenic forcing determine how species distributions change over time. Large changes in species distributions have occurred as a result of climate change. The objective of this study was to analyse how the spatial distribution of cod and flounder have changed in the Baltic Sea during the past four decades characterized by large hydrological changes. Location: Baltic Sea Taxon: Cod (Gadus morhua) and flounder (Platichthys flesus) Methods:...

Data from: Oxygen depletion in coastal seas and the effective spawning stock biomass of an exploited fish species

Hans-Harald Hinrichsen, Burkhard Dewitz, Jan Dierking, Holger Haslob, Andrejs Makarcuks, Christoph Petereit, Rudi Voss & H.-H. Hinrichsen
Environmental conditions may have previously underappreciated effects on the reproductive processes of commercially exploited fish populations, for example eastern Baltic cod, that are living at the physiological limits of their distribution. In the Baltic Sea, salinity affects neutral egg buoyancy, which is positively correlated with egg survival, as only water layers away from the oxygen consumption-dominated sea bottom contain sufficient oxygen. Egg buoyancy is positively correlated to female spawner age/size. From observations in the Baltic...

Data from: Male mealworm beetles increase resting metabolic rate under terminal investment

Indrikis A. Krams, Tatjana Krama, Fhionna R. Moore, Inese Kivleniece, Aare Kuusik, Todd M. Freeberg, Raivo Mänd, M. J. Rantala, Janina Daukšte & Marika Mänd
Harmful parasite infestation can cause energetically costly behavioural and immunological responses, with the potential to reduce host fitness and survival. It has been hypothesized that the energetic costs of infection cause resting metabolic rate (RMR) to increase. Furthermore, under terminal investment theory, individuals exposed to pathogens should allocate resources to current reproduction when life expectancy is reduced, instead of concentrating resources on an immune defence. In this study, we activated the immune system of Tenebrio...

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