Daniel Oesterwind

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• Dr.
• Senior Researcher at Thünen Institute

In der vorliegenden Roten Liste und Gesamtartenliste der Fische und Neunaugen der marinen Gewässer Deutschlands, welche die Liste von 2013 ersetzt, werden insgesamt 105 etablierte Arten aufgeführt, die bewertet werden. Davon sind 2 Arten (Meerengel und Stechrochen) deutschlandweit ausgestorben oder verschollen. Insgesamt werden 10 Arten als bestand...

Non-indigenous species (NIS) are on a rise globally. They can pose strong impacts on ecosystems in their non-native range and can therefore be a serious threat to biodiversity. Here, we compile the existing information available regarding the extent to which commercially and recreationally used fish stocks (exploited fish species) are affected by N...

Squids occur worldwide in marine ecosystems and play a major role in pelagic food webs by connecting lower and higher trophic levels. Their high feeding intensities and pronounced diel vertical migrations make squids important components of nutrient cycles in marine ecosystems. This study assessed the trophic position and nutritional ecology of a s...

Species Distribution Models (SDMs) are widely used tools for studying potential climate-induced shifts in species distribution to support future marine spatial planning. However, the ecological plausibility of selected models is often neglected, particularly in marine ecosystems, resulting in potentially misleading outcomes, especially when climate...

Climate-induced changes in the marine ecosystem have been documented worldwide. As one of the main consequences, a shift in the distribution of species is observable in many marine areas, resulting in the formation of new species communities and new interactions. In the North Sea, the squid community has changed considerably over the last 100 years...

Fisheries independent surveys require rethinking because of increasing spatial restrictions and interactions with offshore wind energy development (OWD). Fisheries, protected species, and environmental data collections have been conducted by scientific institutions to meet societal demands for food security, conservation, and other marine uses. The...

We evaluated the feasibility of classifying ommastrephid and loliginid squid species by statolith shape analysis into fisheries management units, or stocks. Statoliths of Illex coindetii (Verany, 1839) and Loligo forbesii (Steenstrup, 1856) were studied from multiple areas of the North East Atlantic and Northern Mediterranean Sea during 2021-2022....

Scientific monitoring is a fundamental basis of scientific advice. Among others, monitoring aims at contributing towards understanding the influence of anthropogenic use (e.g. fisheries), the health of a stock and individuum and effectiveness of management and conservation measures (e.g. MPAs). Monitoring of demersal and benthic fish communities is...

Fish stock assessment and sustainable management requires that the whole distribution area of the managed fish stocks is representatively sampled. Along with an increasing demand for renewable energy in Europe, a growing number of areas are allocated for current and future offshore wind farms (OWF). Besides various unknown environmental effects, im...

Improving the conservation status and the management of Red List species requires knowledge on the biology and distribution of the organisms as well as an evaluation of the appropriateness of management measures. This study provides information on the trophic ecology and seasonal abundances of two Red List fish species from the Western Baltic Sea,...

In the face of ongoing habitat destruction and biodiversity loss, adequate sampling methods for coastal fish communities are required to conduct sound ecological research and reduce sampling impacts in vulnerable habitats like seagrass meadows. However, different active and passive fishing methods might only capture specific fragments of fish diver...

The study of marine food web models has increased during the last years, but input data of important groups such as cephalopods are missing sometimes which restricts the quality of the model results. Cephalopods feed on a variety of preys, ranging from small crustaceans to large commercially important fish species. In turn, they are taken by larger...

Bottom trawling is one of the main pressures on benthic ecosystems, directly impacting the targeted species and physically disturbing the seabed and the benthic invertebrate communities, in turn indirectly impacting benthivorous fish and the entire benthic food web structure and functioning. To predict the cascading effect of bottom trawling on ben...

The Workshop on a Research Roadmap for Offshore and Marine Renewable Energy (WKOMRE) examined the ICES role in providing science, data, and advice in the context of offshore and marine renewable energy development. For 120 years, ICES has led an international marine science collaboration to support the sustainable use of the ocean. Much of the focu...

Globally, successful invasions of non-indigenous species affect biodiversity and can push ecosystems beyond tipping points. This study aimed to identify factors that influence round goby (Neogobius melanostomus) abundances and distribution pathways along the eastern German coast of the Baltic Sea over a 12-year period. The study further explored ho...

Despite being landed in commercial cephalopod fisheries, species of Alloteuthis are not yet well defined, with A. subulata and A. media often confused. DNA barcoding combined with morphometric analyses has begun to clarify the distinction between these two morphologically similar species but has been limited in its geographic coverage to date. Here...

WGCEPH worked on six Terms of Reference. These involved reporting on the status of stocks; reviewing advances in stock identification, assessment for fisheries management and for the Marine Strategy Framework Directive (MSFD), including some exploratory stock assessments; reviewing impacts of human activities on cephalopods; developing identificati...

With the aim of maintaining or obtaining good environmental status in the Northeast Atlantic and northern Mediterranean Sea, the European Marine Strategy Framework Directive (EU-MSFD) came into force in 2008. All EU Member States (MS) have the task of assessing the current state of their adjacent waters to guarantee sustainable use of marine resour...

The aim of the Workshop on Stickleback and Round Goby in the Baltic Sea (WKSTARGATE) was to update, summarize and synthesize the current knowledge of both species with respect to their ecology and potential use in fisheries. Ongoing projects were presented in the mornings of the first two days to inform participants about current research in the re...

The inshore commercial squids, Loligo vulgaris and L. forbesii, co-occur in the ecoregions of Celtic Seas and Greater North Sea but the spatio-temporal structure of their spawning ranges is poorly understood. To help solve the problem, data sets collected during the last 30 years by British, German, French, and Irish scientists, as well as observat...

The veined squid, Loligo forbesii Steenstrup, 1856, occurs at the European Shelf areas including the Azores and represents a valuable resource for the European commercial fishery in the North East Atlantic. However, very little is known about its population structure and phylogeography. This lack of knowledge also impedes the development of sustain...

Global studies imply that cephalopods have benefited from climate change. However, in most areas, species-specific long-term cephalopod data sets do not exist to support this implication and to analyse the response of cephalopods to environmental changes. Our results illustrate that historical studies, in combination with recent data sets, can fil...

Recent review papers have addressed progress in stock assessment and forecasting for fished cephalopods but there remains a need to develop appropriate management for many European cephalopod fisheries, given that cephalopods are not quota species under the Common Fisheries Policy. Here we briefly review potential barriers to sustainable fishing an...

In past centuries, the impacts on cephalopods from humankind were negligible. The first documented small-scale exploitation of cephalopods occurred in the Mediterranean and Asia. Between 1950-2019, global cephalopod catches increased by about an order of magnitude, from 0.5 million tones to a peak of 4.85 million tons. The human impact on the ocean...

Management measures to facilitate the recovery of fish stocks can lead to shifts in traditional fishing patterns and target species. In the Baltic Sea, drastic reductions in catch quota for cod (Gadus morhua) force mixed demersal trawl fisheries to avoid cod bycatch and focus on flatfish species. This study developed and tested a simple selection c...

Knowledge of stock structure is a priority for effective assessment of commercially-fished cephalopods. Loligo forbesii squid are thought to migrate inshore for breeding and offshore for feeding and long-range movements are implied from past studies showing genetic homogeneity in the entire neritic population. Only offshore populations (Faroe and R...

Native to the Ponto-Caspian region, the benthic round goby (Neogobius melanostomus) has invaded several European inland waterbodies as well as the North American Great Lakes and the Baltic Sea. The species is capable of reaching very high densities in the invaded ecosystems, with not only evidence for significant food-web effects on the native biot...

Marine protected areas (MPAs) are designated parts of the ocean that restrict human activities to a certain degree. MPAs are established around the world using a wide range of legislative instruments and thus come in a variety of forms and shapes. Despite being regarded as the “cornerstone” of global marine conservation efforts, they currently cove...

European squid, Loligo vulgaris and veined squid, Loligo forbesii have nearly coinciding distributions in the northeast Atlantic, a similar reproductive seasonality, and largely overlapping depth ranges of spawning grounds. There are no unambiguous criteria to distinguish between egg masses of both species. This pioneering study was focused on the...

This experimental field study provides first insights into the impact of a widely spread non-native fish species, round goby Neogobius melanostomus (Pallas 1814), on the diversity of native epifaunal macroinvertebrate communities in the Baltic Sea. A cage experiment was conducted in a macrophyte habitat in the Åland islands located in the northern...

With the depletion of many commercial fish stocks and an increasing demand for marine protein for human consumption, cephalopods have become more important as a fishery resource. In EU waters, cephalopod stocks are not routinely assessed and exploitation of these species by large-scale fisheries is largely unregulated. For sustainable exploitation,...

The lesser flying squid (Todaropsis eblanae) and the shortfin squid (Illex coindetii) are two abundant ommastrephids of the northeast Atlantic. Spawning ground existence was inferred from the captures of mature, mated females in summer 2016–2019 and their occurrences were compared with respective oceanographic data from international surveys to gai...

We examined small-scale distribution and feeding ecology of a non-native fish species, round goby (Neogobius melanostomus (Pallas, 1814)), in different habitats of a coastal lagoon situated in the south-western Baltic Sea. First observations of round goby in this lagoon were reported in 2011, 3 years before the current study was conducted, and info...

The Working Group on Cephalopod Fisheries and Life History (WGCEPH) improves knowledge about and the assessment of cephalopods as an exploited resource. WGCEPH report provides information on status and trends in cephalopod stocks; preliminary assessments of selected stocks update information on life history parameters; social and economic profile...

I. coindetii (Vérany 1839) is an oceanic, benthopelagic ommastrephid squid occurring in subtropical / temperate, offshore and coastal waters and continental slope areas. In the Eastern Atlantic, the species is widely distributed, but an evidence that the species occurs in the brackish Baltic Sea and Kattegat has never been published. Here we presen...

Since the beginning of the 21st century, electronic monitoring (EM) has emerged as a cost‐efficient supplement to existing catch monitoring programmes in fisheries. An EM system consists of various activity sensors and cameras positioned on vessels to remotely record fishing activity and catches. The first objective of this review was to describe t...

Global changes drive abundance and distribution of species worldwide. It seems that at least some cephalopod stocks profit from global changes as indicated by increases in biomass and/or expansion of their geographical distribution, as appears to be the case for the commercially important ommastrephid squid Illex coindetii, in the North Sea. Based...

There are different studies illustrating that fauna and flora in marine oceans have changed significantly over the last decades. Many of those studies focus on taxa with long-living species, particularly fish. In contrast, cephalopod species with annual live cycles are able to adjust faster to changing environments and may therefore benefit from gl...

The Working Group on Technology Integration for Fishery-Dependent Data (WGTIFD) met in Copenhagen, Denmark, 7-9 May 2019 for its first meeting in its three-year multi-annual cycle. WGTIFD has diverse membership including technology service providers, academic and gov-ernmental marine institutions, and non-profit environmental organizations, across...

The Ponto-Caspian round goby (Neogobius melanostomus Pallas, 1814) is a prominent invasive species in many European waters. Eggs of the Western Baltic Spring Spawning Atlantic herring might be attractive prey for the invasive round goby during the spawning season. However, investigations of the small fish fauna in an important spawning area of herr...

HELCOM facts sheet (also available here http://www.helcom.fi/baltic-sea-trends/environment-fact-sheets/biodiversity/abundance-and-distribution-of-round-goby/) on the abundance, distribution and impacts of the invasive round goby (Neogobius melanostomus) in the Baltic region.

Coastal global oceans are expected to undergo drastic changes driven by climate change and increasing anthropogenic pressures in coming decades. Predicting specific future conditions and assessing the best management strategies to maintain ecosystem integrity and sustainable resource use are difficult, because of multiple interacting pressures, unc...

Due to its unique characteristics with substantial drainage area and limited water exchange with the North Sea, considerable salinity gradient, permanent stratification as well as a combination of numerous, strong anthropogenic and climatic pressures the Baltic Sea environment is under constant stress. Considering the intensity of exploitation and...

The goal of BONUS BIO-C3 was to investigate the causes and consequences of changes in biodiversity on all its biological scales-genetic, taxonomic, functional, habitat and ecosystem diversity-in the Baltic Sea system. We wanted to move away from a static to a dynamic system view incorporating environmental change as well as the potential for specie...

Identification and quantification of pressure‐state links of biodiversity indicators is one of the major scientific challenges ahead. This task aimed at identifying and quantifying the pressure-state links of selected biodiversity indicators, their relevance and response to management measures. Relevant indicators have been selected based on their...

In the Baltic, the first observation of the round goby (Neogobius melanostomus, Pallas 1814) was made in 1990. Within the past decade the species became invasive and spread rapidly throughout the Baltic Sea. Studies about the fishes potential impacts on resident species promote the need for an increasing knowledge of their basic stock structures su...

In fishery science, early life-stage survival and development are regarded as major factors driving the population dynamics of marine fishes. During the last century, the main research focus has been on the spatio-temporal match of larval fish and appropriate food (bottom-up processes). However, these field studies are often criticised for their li...

Protecting the ecological integrity of marine waters is a prime objective that has recently been explicitly acknowledged by the United Nations with the sustainable development goal SDG14, but that is challenged by the mounting pressures on marine systems. We here argue that the Baltic Sea can serve as marine time machine to study the causes and con...

The round goby (Neogobius melanostomus) is considered to be one of the most successful piscine invaders in the Baltic Sea. Combining several case studies on habitat preferences, feeding ecology and their appropriateness as prey organism for higher trophic levels we examined the biological and ecological causes and consequences of the establishment...

The round goby (Neogobius melanostomus) is considered to be one of the most successful piscine invaders in the Baltic Sea. Based on stomach content analysis, current studies reveal a negligible direct effect of round goby on native fish species, while spatial and temporal overlap between spawning grounds were largely ignored. Therefore, we conducte...

Atlantic herring (Clupea harengus) migrates from offshore to coastal areas to spawn and their eggs and larvae may substantially increase prey resources for resident predators. We combined an in situ predator exclusion experiment using eggs naturally spawned on submerged aquatic vegetation and field observations of predator abundance to estimate the...

The deliverable shed light on the direct and indirect food-web effects of increasing abundance and expanding ranges of certain invasive non-indigenous species on native populations and ecosystem functioning. The results support predictions about impact of invasive and non-indigenous species performed in WP3 and WP4. Focus was given on the invasive...

The task 3.4 ‘Dynamics of habitats in space and time under driver forcing’ in BONUS BIO-C3 aimed to investigate the dynamics of current habitats of the Baltic Sea by examining historical data on marine physics, chemistry, geology, and socio‐economic development. Further, the task developed models to represent spatio‐temporal variation of drivers. T...

Different studies on the position of the non-indigenous species Neogobius melanostomus within the coastal food web of the Pomeranian Bay (western Baltic) were performed, resulting in a quantitative and qualitative species list of prey organisms found in the stomachs of the invader and an estimation concerning the importance of round goby as prey fo...

In 2015 the EU Commission decided to review the structure of the criteria and indicators of the Marine Strategy Framework Directive (MSFD). This paper reviews some shortcomings of the current structure of Descriptor 3 (D3) addressing the status of exploited fish and shellfish stocks and suggests a more operational structure for D3. By reframing D3,...

The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not available, leaving the present stock status unclear and casting doubts about the magnitude of the recent increase...

In the marine sciences an increasing number of studies on environmental changes, their causes, and environmental assessments emerged in recent years. Often authors use non-uniform and inconsistent definitions of key terms like driver, threats, pressures etc. Although all of these studies clearly define causal dependencies between the interacting so...

Bottom-up and top-down driven larvae mortality is generally accepted to be a key element controlling the recruitment success and population dynamics of fishes. The majority of studies that examine larvae predation have been conducted in offshore and rather oceanic habitats. However, many important spawning beds and larval nursery areas of marine fi...

All organisms move during some stage(s) in their life-cycle. Movement can be inter-generational dispersal by eggs, spores or larvae/juveniles, or it may be migrations during the adult stage, e.g. to feeding or spawning areas. On an evolutionary timescale also genes move through space from one generation to the next, also known as gene flow. The mov...

The catchment area of the Baltic includes 14 countries, about 85 million people and around 200 rivers. Therefore it is not surprising that different drivers and pressures induced by human activities impact the Baltic ecosystem. Therefore the task is a mix between a review of important drivers and pressures and results from model runs to hind- ca...

The Baltic Sea experienced large changes in community composition, yet it is largely unknown how these changes affect ecosystem functioning. The objectives of BIO-C3 Task 2.1 is to improve our understanding on how biodiversity changes at the base of the food web propagate to higher trophic levels and affect ecosystem functioning. This overall quest...

This report presents a brief overview of ecologically or economically important species of different habitats and trophic levels in the Baltic. It supplies the modeling groups within BIO C3 with species specific information on environmental tolerances and preferences and identifies some gaps in knowledge. Where possible, information was provided...

The Ponto-Caspian round goby Neogobius melanostomus has spread to various locations worldwide as an invasive species and is now amongst others present in the Great Lakes, European river systems and in the Baltic Sea. We investigated the abundance and feeding ecology of the round goby in different habitat types in the Greifswalder Bodden situated in...

Round goby Neogobius melanostomus is one of the most successful invasive fish species. From its origin, the Ponto-Caspian region, the euryhaline species invaded different locations worldwide. In 1990 first individuals were observed in the Great Lakes in North America and within a very short period, the goby became a pervasive fish species there. At...

Cephalopods are important predators and key organisms in numerous marine ecosystems, but their abundance in the North Sea, one of the most productive shelf seas, seems to be low. Here we report on three Ommastrephidae (Illex coindetii, Todarodes sagittatus, and Todaropsis eblanae) that have been caught on several North Sea cruises between 2007 and...

Survey-based abundance indices (catch per unit effort, cpue) and harvest ratios (HRs) are usable proxies for spawning-stock biomass and fishing mortality (F). Here, we present an easy approach to calculate secondary indicators based on a public dataset. However, the performance of different cpue/HR indicator metrics varied between stocks, and, ther...

Der Nutzungskonflikt zwischen Fischerei und Naturschutz nimmt auch in der öffentlichen Wahrnehmung seit Jahren zu. Die Ausweisung von Schutzgebieten, für die Umweltverbände die Einstellung der Nutzung durch die Fischerei fordern, wird im schlimmsten Fall die Fischerei mit Grundschlepp- und Stellnetzen sehr stark einschränken. Es gibt jedoch kaum be...

The Ecosystem Based Management (EBM) within the EU Marine Strategy Framework Directive (MSFD) calls for a more holistic view of the exploited marine ecosystem. To inform this approach, data collection from the marine environment beyond fisheries’ target species and specifically data on the impact of human activities has to be extended. Sampling of...

Here we present current and past work of the Rebikoff-Niggeler Foundation (FRN) a non-profit institution which was established in 1994 on the island of Faial/Azores. The FRN is named after Dimitri and Ada Rebikoff-Niggeler, a Franco-Suisse couple who dedicated their lives to the development of underwater technology. The main objectives of the found...

The squid Alloteuthis subulata (Cephalopoda: Loliginidae) is a small species, widely distributed in shallow coastal waters of the north-eastern Atlantic and adjacent waters. It is commercially exploited in some areas, principally as by-catch, but it is not considered to be economically important at present, and very little is known about its ecolog...

http://www.helcom.fi/Core%20Indicators/HELCOM-CoreIndicator-Proportion_of_large_fish_in_the_community.pdf

Cephalopods were sampled during the ICES International Bottom Trawl Survey (IBTS) in the North Sea from 2007 to 2010. Relative catch numbers of dominant long-finned squids (Alloteuthis subulata and Loligo forbesii) were calculated from all stations of the surveys over three years, and spatial interpolations such as deterministic inverse distance we...

In 2010 the European Commission published a suite of criteria, indicators and methodological standards how to assess the environmental status within the eleven descriptors of the MSFD (EU-COM Decision 477/2010). For Descriptor 3 that covers the status of exploited fish and shellfish stocks, the EU-guideline distinguishes between primary and seconda...

The EU’s Marine Strategy Framework Directive (MSFD) requests Member States to develop marine strategies for the marine areas under their responsibility that must contain a detailed assessment of the state of the environment, a definition of ‘good environmental status’ (GES), and the establishment of clear environmental targets and monitoring progra...

The Marine Strategy Framework establishes four European Marine Regions, based on geographical and environmental criteria. Each Member State is required to develop a marine strategy for their own waters (EEZs or extended Continental Shelf areas), but Good Environmental Status will be considered at region or subregion scale. The Northeast Atlantic Ma...

Cephalopods were sampled from bycatches of recent ICES international bottom‐trawl surveys performed in the North Sea. In terms of numbers and biomass, the long‐fin squids Alloteuthis subulata and Loligo forbesi were by far the most dominant. Relative catch numbers of both species were calculated from all stations of the surveys, and spatial interpo...

The EU’s Marine Strategy Framework Directive (MSFD) requests Member States to develop marine strategies for the marine areas under their responsibility that must contain a detailed assessment of the state of the environment, a definition of ‘good environmental status’ (GES), and the establishment of clear environmental targets and monitoring progra...

The Terms of Reference for WGECO in 2011 were more diverse, and also more focused on responses to other groups within ICES than has been the case in some previous years. There was also a considerable overlap in scope between the ToR. As in previous years, there was considerable focus on the science needed to support the objectives of the Marine Str...

Between summer 2007 and winter 2010, during ICES International Bottom Trawl Surveys (IBTS) 12 cephalopod species were encountered (Alloteuthis subulata, Loligo forbesi, Loligo vulgaris, Illex coindetii, Todarodes sagittatus, Todaropsis eblanae, Rossia macrosoma, Sepiola atlantica, Sepietta oweniana, Sepia elegans, Sepia officinalis, Eledone cir...

Zwischen dem Sommer 2007 und dem Winter 2010 konnten im Rahmen des International Bottom Trawl Survey (IBTS) in der Nordsee 178.847 Tintenfische gefangen werden. Insgesamt konnten 12 verschiedene Arten (Alloteuthis subulata, Loligo forbesi, Loligo vulgaris, Illex coindetii, Todarodes sagittatus, Todaropsis eblanae, Rossia macrosoma, Sepiola atlantic...