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article

DNA metabarcoding reveals the importance of gelatinous zooplankton in the diet of Pandalus borealis, a keystone species in the Arctic

Paulina Urban, Kim Præbel, Shripathi Bhat, Jan Dierking, more

Molecular Ecology > 31 > 5 > 1562 - 1576

Information about the dietary composition of a species is crucial to understanding their position and role in the food web. Increasingly, molecular approaches such as DNA metabarcoding are used in studying trophic relationships, not least because they may alleviate problems such as low taxonomic resolution or underestimation of digestible taxa in the diet. Here, we used DNA metabarcoding with universal...

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Convective circulation influences horizontal movement by planktonic crustaceans in the littoral zone of a mesotrophic lake

Vladimir I. Razlutskij, Zhanna F. Buseva, Irina Yu. Feniova, Vitaliy P. Semenchenko

Freshwater Biology > 66 > 4 > 716 - 729

Crustacean zooplankton perform diel vertical and horizontal migrations in lakes to avoid predators and/or exploit food resources more efficiently. Crustaceans may also move passively with convective flows that are generated by the nocturnal cooling of the surface water. Water in the shallow littoral zone cools faster than deeper pelagic waters. Therefore, bottom water moves from inshore to the...

article

Adaptive divergence across Southern Ocean gradients in the pelagic diatom Fragilariopsis kerguelensis

Ute Postel, Barbara Glemser, Katherine Salazar Alekseyeva, Sarah Lena Eggers, more

Molecular Ecology > 29 > 24 > 4913 - 4924

The Southern Ocean is characterized by longitudinal water circulations crossed by strong latitudinal gradients. How this oceanographic background shapes planktonic populations is largely unknown, despite the significance of this region for global biogeochemical cycles. Here, we show, based on genomic, morphometric, ecophysiological and mating compatibility data, an example of ecotypic differentiation...

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Vulnerability of marine resources to small‐scale fishing in a tropical area: The example of Sunda Strait in Indonesia

Yonvitner Yonvitner, Josep LIoret, Mennofatria Boer, Rahmat Kurnia, more

Fisheries Management and Ecology > 27 > 5 > 472 - 480

Although small‐scale fisheries (SSF) play an important socio‐economic role in developing nations, overfishing seems to be increasing the risk of stock vulnerability. This study aims to quantify the pressure of SSF on fish stocks in Sunda Strait (Indonesia) using several biological indicators that are important in quantifying fishing pressure. Data on these indicators were collected monthly for three...

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Petrography of Late Cambrian to Middle Ordovician radiolarian chert in Kazakhstan with special reference to the emergence of benthic animals in the pelagic realm

Yoshitaka Kakuwa, Olga I. Nikitina, Catherine Reid

Sedimentology > 67 > 5 > 2764 - 2776

Upper Cambrian to Middle Ordovician radiolarian chert successions from Kazakhstan were studied to clarify the history of the emergence of benthic animals in ocean floor sediments. Radiolarian tests and clay were deposited for a period of 30 Myr without experiencing an influx of continent‐derived coarse clastic materials. Red, grey and black cherts of the Upper Cambrian to the upper mid‐Darriwilian...

article

Lifeform indicators reveal large‐scale shifts in plankton across the North‐West European shelf

Jacob Bedford, Clare Ostle, David G. Johns, Angus Atkinson, more

Global Change Biology > 26 > 6 > 3482 - 3497

Increasing direct human pressures on the marine environment, coupled with climate‐driven changes, is a concern to marine ecosystems globally. This requires the development and monitoring of ecosystem indicators for effective management and adaptation planning. Plankton lifeforms (broad functional groups) are sensitive indicators of marine environmental change and can provide a simplified view of plankton...

article

The evolution of specialized dentition in the deep‐sea lanternfishes (Myctophiformes)

Rene P. Martin, Matthew P. Davis

Journal of Morphology > 281 > 4-5 > 536 - 555

The evolution of heterodonty, the possession of varied tooth morphologies on the jaws of animals, has been relatively unexplored in ray‐finned fishes compared to terrestrial vertebrates, and to an even lesser degree in deep‐sea fish lineages. Lanternfishes (Myctophiformes) are an abundant and species‐rich group endemic to deep‐sea pelagic habitats. In this study, we document the presence of heterodonty...

article

Thermal response of demersal and pelagic juvenile fishes from the surf zone during a heat‐wave simulation

Eidi Kikuchi, Fernando Rafael De Grande, Rafael Mendonça Duarte, Teodoro Vaske‐Júnior

Journal of Applied Ichthyology > 35 > 6 > 1209 - 1217

Experimental measurements were collected in the laboratory to evaluate the maximum thermal limit and thermal plasticity of Neotropical juvenile fish with different life habitats (demersal and pelagic) from surf zone in response to a “heat‐wave experiment”. Trials were conducted using two temperature acclimations (T_a), including the current average temperature of Southeastern Brazil (T_a: 14 days at...

article

Variation in Hg accumulation between demersal and pelagic fish from Puruzinho Lake, Brazilian Amazon

Lucas Silva Azevedo, Inácio Abreu Pestana, Adriely Ferreira Costa Nery, Wanderley Rodrigues Bastos, more

Ecotoxicology > 2019 > 28 > 10 > 1143-1149

Aquatic ecosystems in the Amazon are exposed to mercury, mostly from natural sources. Hg accumulation in fish tissues poses a risk to the local population since fish is one of the main sources of protein in the region. The aim of this study was to evaluate Hg distribution in demersal and pelagic carnivorous fish between seasons in Puruzinho Lake in the Brazilian Amazon. Total Hg was quantified in...

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Effect of light intensity and substrate type on siscowet lake trout (Salvelinus namaycush siscowet) predation on deepwater sculpin (Myoxocephalus thompsonii)

Trevor D. Keyler, Thomas R. Hrabik, Allen F. Mensinger, Loranzie S. Rogers, more

Hydrobiologia > 2019 > 840 > 1 > 77-88

Foraging characteristics of siscowet lake trout (Salvelinus namaycush siscowet) on deepwater sculpin (Myoxocephalus thompsonii) were studied under ecologically relevant downwelling light intensities (9.0 × 10⁸ to 1.62 × 10¹¹ photons m⁻² s⁻¹) and emission spectrum (500–510 nm) on varying substrates (gravel, sand, and black fabric). Siscowet reaction distance within our trials increased with light intensity...

article

Siscowet lake charr (Salvelinus namaycush siscowet) visual foraging habitat in relation to daily and seasonal light cycles

Trevor D. Keyler, Bryan G. Matthias, Thomas R. Hrabik

Hydrobiologia > 2019 > 840 > 1 > 63-76

Using siscowet lake charr (Salvelinus namaycush siscowet) as an example organism, we modeled visual foraging habitat in relation to: (i) daily solar and lunar intensity, (ii) seasonal changes in maximum solar and lunar altitude, (iii) foraging for pelagic or benthic prey, and (iv) increased turbidity that may occur with climate change. Siscowet foraging success increased with light intensity and was...

article

Big fish eat small fish: implications for food chain length?

U. Sommer, E. Charalampous, M. Scotti, M. Moustaka-Gouni

Community Ecology > 2018 > 19 > 2 > 107-115

Food chains in the pelagic zones of oceans and lakes are longer than in terrestrial ecosystems. The perception of the pelagic food web has become increasingly complex by progressing from a linear food chain (phytoplankton — crustacean zooplankton — planktivorous fish — predatory fish) to a food web because of an increasing appreciation of microbial trophic pathways, side-tracks by gelatinous zooplankton...

article

Ecosystem spatial structure revealed by integrated survey data

Pierre Petitgas, Martin Huret, Christine Dupuy, Jérôme Spitz, more

Progress in Oceanography > 2018 > 166 > C > 189-198

Integrated marine survey series such as PELGAS provide comprehensive geo-referenced data over large sea areas in major ecosystem components with defined biological resolution and spatio-temporal sampling scale. These data enable to develop product at different levels of biological organization and spatial scale that are useful for ecosystem integrated assessments. Using the PELGAS integrated data...

article

A novel heterocyst glycolipid detected in a pelagic N2-fixing cyanobacterium of the genus Calothrix

Nicole J. Bale, Ellen C. Hopmans, Denise Dorhout, Lucas J. Stal, more

Organic Geochemistry > 2018 > 123 > C > 44-47

Previous studies have shown that heterocyst glycolipids (HGs) are unique markers for N₂-fixing heterocystous cyanobacteria. In this study, the HGs of a marine pelagic Calothrix sp. CCY1611 isolated from the tropical western North Atlantic were analyzed by ultra-high pressure liquid chromatography–high resolution mass spectrometry and it was shown that this organism contains an unusual C₂₈ triol HG...

article

Towards an Autonomous Pelagic Observatory: Experiences from Monitoring Fish Communities around Drifting FADs

Patrice Brehmer, Gorka Sancho, Vasilis Trygonis, David Itano, more

Thalassas: An International Journal of Marine Sciences > 2019 > 35 > 1 > 177-189

This work presents a methodological synthesis for the in situ monitoring of fish aggregating devices (FADs) using a combination of optical, echosounder and SCUBA observations conducted in the vicinity of drifting FADs. The acoustic methods allowed, according to the devices used, the description of the spatial organisation and dynamics of biotic scattering layers, individual fishes, schools, shoals...

article

Association between the interannual variation in the oceanic environment and catch rates of bigeye tuna (Thunnus obesus) in the Atlantic Ocean

Kuo‐Wei Lan, Ming‐An Lee, Chin‐Pei Chou, Ali Haghi Vayghan

Fisheries Oceanography > 27 > 5 > 395 - 407

The environmental processes associated with variability in the catch rates of bigeye tuna in the Atlantic Ocean are largely unexplored. This study used generalized additive models (GAMs) fitted to Taiwanese longline fishery data from 1990 to 2009 and investigated the association between environmental variables and catch rates to identify the processes influencing bigeye tuna distribution in the Atlantic...

article

Are ocean conditions and plastic debris resulting in a ‘double whammy’ for marine birds?

Mark C. Drever, Jennifer F. Provencher, Patrick D. O'Hara, Laurie Wilson, more

Marine Pollution Bulletin > 2018 > 133 > C > 684-692

We report a mortality event of Red Phalaropes (Phalaropus fulicarius) that occurred from October to November 2016 on the north coast of British Columbia, Canada. All individuals were severely underweight and showing signs of physiological stress. The guts of all carcasses contained ingested plastics (100%, n = 9). Distribution modelling from pelagic bird surveys (1990–2010) indicated that Red Phalaropes...

article

Auto-correlated directional swimming can enhance settlement success and connectivity in fish larvae

Igal Berenshtein, Claire B Paris, Hezi Gildor, Erick Fredj, more

Journal of Theoretical Biology > 2018 > 439 > C > 76-85

Larvae of coastal-marine fishes have been shown repeatedly to swim directionally in the pelagic environment. Yet, biophysical models of larval dispersal typically impose a Simple Random Walk (SRW) algorithm to simulate non-directional movement in the open ocean. Here we investigate the use of a Correlated Random Walk (CRW) algorithm; imposing auto-correlated directional swimming onto simulated larvae...

article

Effects of Terrestrial Organic Matter on Aquatic Primary Production as Mediated by Pelagic–Benthic Resource Fluxes

Francisco Rivera Vasconcelos, Sebastian Diehl, Patricia Rodríguez, Jan Karlsson, more

Ecosystems > 2018 > 21 > 6 > 1255-1268

Flows of energy and matter across habitat boundaries can be major determinants of the functioning of recipient ecosystems. It is currently debated whether terrestrial dissolved organic matter (tDOM) is a resource subsidy or a resource subtraction in recipient lakes. We present data from a long-term field experiment in which pelagic phosphorus concentration and whole-ecosystem primary production increased...

article

Nutritional physiology of mahi-mahi (Coryphaena hippurus): Postprandial metabolic response to different diets and metabolic impacts on swim performance

John D. Stieglitz, Daniel D. Benetti, Martin Grosell

Comparative Biochemistry and Physiology Part A: Molecular & Integrative... > 2018 > 215 > C > 28-34

Migratory pelagic fish species, such as the mahi-mahi (Coryphaena hippurus), must balance numerous metabolic demands simultaneously in order to survive in a challenging oceanic environment. Energetic support for such demands comes from a variety of natural prey items in the wild and can come from manufactured pelletized feed in captivity. This study quantified postprandial metabolism, commonly referred...

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Search results

DNA metabarcoding reveals the importance of gelatinous zooplankton in the diet of Pandalus borealis, a keystone species in the Arctic

Convective circulation influences horizontal movement by planktonic crustaceans in the littoral zone of a mesotrophic lake

Adaptive divergence across Southern Ocean gradients in the pelagic diatom Fragilariopsis kerguelensis

Vulnerability of marine resources to small‐scale fishing in a tropical area: The example of Sunda Strait in Indonesia

Petrography of Late Cambrian to Middle Ordovician radiolarian chert in Kazakhstan with special reference to the emergence of benthic animals in the pelagic realm

Lifeform indicators reveal large‐scale shifts in plankton across the North‐West European shelf

The evolution of specialized dentition in the deep‐sea lanternfishes (Myctophiformes)

Thermal response of demersal and pelagic juvenile fishes from the surf zone during a heat‐wave simulation

Variation in Hg accumulation between demersal and pelagic fish from Puruzinho Lake, Brazilian Amazon

Effect of light intensity and substrate type on siscowet lake trout (Salvelinus namaycush siscowet) predation on deepwater sculpin (Myoxocephalus thompsonii)

Siscowet lake charr (Salvelinus namaycush siscowet) visual foraging habitat in relation to daily and seasonal light cycles

Big fish eat small fish: implications for food chain length?

Ecosystem spatial structure revealed by integrated survey data

A novel heterocyst glycolipid detected in a pelagic N2-fixing cyanobacterium of the genus Calothrix

Towards an Autonomous Pelagic Observatory: Experiences from Monitoring Fish Communities around Drifting FADs

Association between the interannual variation in the oceanic environment and catch rates of bigeye tuna (Thunnus obesus) in the Atlantic Ocean

Are ocean conditions and plastic debris resulting in a ‘double whammy’ for marine birds?

Auto-correlated directional swimming can enhance settlement success and connectivity in fish larvae

Effects of Terrestrial Organic Matter on Aquatic Primary Production as Mediated by Pelagic–Benthic Resource Fluxes

Nutritional physiology of mahi-mahi (Coryphaena hippurus): Postprandial metabolic response to different diets and metabolic impacts on swim performance

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