Journal of Plankton Research

http://plankt.oxfordjournals.org

List of Papers (Total 2,340)

Stoichiometric regulation in micro- and mesozooplankton

Aquatic ecosystems experience large natural variation in elemental composition of carbon (C), nitrogen (N) and phosphorus (P), which is further enhanced by human activities. Primary producers typically reflect the nutrient ratios of their resource, whose stoichiometric composition can vary widely in conformity to environmental conditions. In contrast, C to nutrient ratios in ...

Patterns of thermal limits of phytoplankton

The latitudinal patterns of the optimal, minimal and maximal growth temperatures of phytoplankton are analyzed using linear mixed-effect models, and whether environmental temperature plays a role in affecting these thermal traits is tested. The optimal, minimal and maximal growth temperatures of phytoplankton decrease with latitude for marine taxa; whereas the minimal and maximal ...

Heating up a cold subject: prospects for under-ice plankton research in lakes

Long-term patterns and drivers of ecosystem structure may be misunderstood if knowledge of an ecosystem is derived primarily from a single season, a situation common in many temperate lakes where the role of winter has been less studied. In lakes, avoidance of winter research has been especially pronounced for those that experience winter ice, but critical ecological processes can ...

Persistence of Calanus finmarchicus in the western Gulf of Maine during recent extreme warming

The planktonic copepod, Calanus finmarchicus, resides at the southern edge of its subarctic range in the Gulf of Maine (GoM). Here we investigate the population response of C. finmarchicus to record warming in the GoM in 2012. Demographic data from two time series stations and a plankton survey conducted in early autumn 2012 show that C. finmarchicus did not produce an autumn ...

Female mating status affects mating and male mate-choice in the copepod genus Acartia

Mating in many copepod species is not random; moreover, individuals have preferences for certain qualities in their mates. This study tested whether female mating status (virgin versus mated) affects mate choice in males in the copepod species Acartia tonsa and Acartia hudsonica, both in laboratory and field populations. In addition, the costs and benefits associated with mating ...

Long-term patterns in 50 years of scyphomedusae catches in the western Dutch Wadden Sea in relation to climate change and eutrophication

Using a unique 50-year high-resolution time series of daily kom-fyke catches, long-term patterns of scyphomedusae in the western Dutch Wadden Sea were analysed and related to changes in environmental conditions [eutrophication in the 1980s–1990s and recent climate change (increased water temperature)] in the area. Over the years, species composition and general pattern of ...

Interannual patterns during spring and late summer of larvaceans and pteropods in the coastal Gulf of Alaska, and their relationship to pink salmon survival

Larvacean (=appendicularian) and pteropod (Limacina helicina) composition and abundance were studied with physical variables each May and late summer across 11 years (2001–2011), along a transect that crosses the continental shelf of the sub-Arctic Gulf of Alaska (GoA) and five stations within Prince William Sound (PWS). Collection with 53-µm plankton nets allowed the ...

Fine-scale zooplankton vertical distribution in relation to hydrographic and optical characteristics of the surface waters on the Arctic shelf

One of the main challenges in contemporary biological oceanography is to understand the factors that drive the spatial heterogeneity of pelagic organisms. Our study was performed at 10-m depth intervals within the upper 50 m of the ocean, at two different localities on the West Spitsbergen Shelf in the summers of 2009 and 2010. The fine-scale patterns in vertical zooplankton ...

Structuring of zooplankton and fish larvae assemblages in a freshwater-influenced Greenlandic fjord: influence from hydrography and prey availability

The recent increase in temperature and freshwater runoff in the Arctic will influence the functioning of the plankton ecosystem and hence the life of the fish larvae residing in these areas. Here, we studied the strength of physical–biological linkages and the adaptability of individual larval fish species to changing hydrographical and feeding environments in a sub-Arctic area in ...

Subtropical zooplankton assemblage promotes the harmful cyanobacterium Cylindrospermopsis raciborskii in a mesocosm experiment

Harmful algal blooms (HABs) with public health impacts threaten freshwater ecosystems, including drinking water reservoirs, globally. Subtropical systems are often dominated by filamentous and colonial cyanobacteria, algae that are potentially less accessible for consumption by resident meso-zooplankton grazers. Less understood than selective grazing is the role of zooplankton in ...

Environmental filtering of crustacean zooplankton communities in fishless boreal lakes: expectations and exceptions

To test the paradigm that large-bodied zooplankton species dominate in fishless lakes, we evaluated crustacean zooplankton composition of 53 fishless boreal lakes across a broad geographic scale (north-west Saskatchewan, Canada) in relation to contemporary environmental factors. Lake productivity, acid–base status and intensity of invertebrate predation were the three major ...

Diversity of the Daphnia longispina species complex in Chinese lakes: a DNA taxonomy approach

Cladocerans of the Daphnia longispina complex are often the key components of pelagic food webs in northern temperate lakes and ponds. In the present study, we aimed to fill the gap in knowledge on the biogeography and diversity of this species complex, through analysis (by sequencing two mitochondrial genes) of the taxonomic structure of 18 lake populations across China, covering ...

Prey-induced vertical migration in Chaoborus larvae under different predator and light regimes

For freshwater prey like Daphnia and larvae of Chaoborus, it is well documented that they adjust their residence depth in the water column in response to predator kairomones in order to decrease encounter probability with the respective predator. Despite the importance of infochemicals in predator–prey interactions, it has not been tested if predators adjust their residence depth ...

When everything is not everywhere but species evolve: an alternative method to model adaptive properties of marine ecosystems

The functional and taxonomic biogeography of marine microbial systems reflects the current state of an evolving system. Current models of marine microbial systems and biogeochemical cycles do not reflect this fundamental organizing principle. Here, we investigate the evolutionary adaptive potential of marine microbial systems under environmental change and introduce explicit ...

Effect of P-limitation on prokaryotic and viral production in surface waters of the Northwestern Mediterranean Sea

The effect of P-limitation and viral infection on prokaryotic production (PP) and respiration was determined during the early winter in the Northwestern Mediterranean Sea. Addition of P enhanced prokaryotic growth and viral production. The concentrations of total dissolved nitrogen increased linearly with decreasing viral abundance, PP and growth efficiency across treatments. Our ...

Non-destructive DNA extraction for small pelagic copepods to perform integrative taxonomy

Molecular analyses of small-sized copepods (≤1 mm) generally involve the complete destruction of the specimens. Consequently, incongruences between the molecular and morphological results cannot be investigated since no specimen vouchers remain. The present study provides a modified column-based DNA extraction method to retain the exoskeleton of the specimen and thus, to enable ...

Prey selectivity in piscivorous bluefin tuna larvae reared in the laboratory

Prey size selectivity in piscivorous fish larvae is important to both aquaculture and fisheries science, but laboratory experiments are few. We analyzed selective foraging in Atlantic bluefin tuna larvae (Thunnus thynnus) using two larval fish prey species. The experiments revealed that selective foraging of prey sizes differed among bluefin tuna predator sizes (15–25 mm SL) and ...

Population density and mate selection in the copepod Acartia tonsa

Population density changes the intensity of mate choice in numerous animal taxa. We used video recordings to test whether such changes can also be observed in the copepod Acartia tonsa during short-term exposures to densities (16–640 ind L−1) for which their egg production is known to be affected. The ratio of observed mating attempts to theoretical encounters was constant among ...

Arctic complexity: a case study on diel vertical migration of zooplankton

Diel vertical migration (DVM) of zooplankton is a global phenomenon, characteristic of both marine and limnic environments. At high latitudes, patterns of DVM have been documented, but rather little knowledge exists regarding which species perform this ecologically important behaviour. Also, in the Arctic, the vertically migrating components of the zooplankton community are usually ...

Individual shrinking to enhance population survival: quantifying the reproductive and metabolic expenditures of a starving jellyfish, Pelagia noctiluca

The holoplanktonic jellyfish Pelagia noctiluca is renowned for periods of high abundance, causing considerable problems to tourism and aquaculture. Little is understood about the drivers of its periodic presence and absence or how it survives unfavourable periods. Studying the effect of starvation, we evaluated the main metabolic expenses (reproduction, respiration and excretion) ...

Morphological and behavioral responses of a rotifer to the predator Asplanchna

Brachionus variabilis, a facultative epibiont on cladocerans, has a pronounced morphological response to Asplanchna. Adult amictic females of the Asplanchna-induced morph, compared with those of the basic or non-induced morph, had a 13% larger lorica, 150% longer posterior spines and 30–40% longer anterior spines. Similar responses occur in many other brachionid rotifers as an ...

Fine-scale vertical distribution of macroplankton and micronekton in the Eastern Tropical North Pacific in association with an oxygen minimum zone

The 0- to 1000-m vertical distribution patterns of micronekton and macrozooplankton were determined in the Costa Rica Dome region (9° N; 90° W) of the Eastern Tropical North Pacific in October–November 2007 and December 2008–January 2009. The area has a pronounced oxygen minimum zone (OMZ) that impacts the distribution of both migrating and mesopelagic species. Sampling was ...

The role of zooplankton communities in carbon recycling in the Ocean: the case of the Southern Ocean

Basin-scale carbon recycling estimates were obtained by combining high-resolution data on zooplankton taxonomic and functional composition with species-specific respiration rates. Datasets were collected in the Atlantic and Indian sectors of the Southern Ocean during four cruises covering spring, mid-summer, autumn and late winter between 1993 and 1998. Carbon recycling by ...

Systematically variable planktonic carbon metabolism along a land-to-lake gradient in a Great Lakes coastal zone

During the summers of 2002–2013, we measured rates of carbon metabolism in surface waters of six sites across a land-to-lake gradient from the upstream end of drowned river-mouth Muskegon Lake (ML) (freshwater estuary) to 19 km offshore in Lake Michigan (LM) (a Great Lake). Despite considerable inter-year variability, the average rates of gross production (GP), respiration (R) and ...