Sophie Pitois

Sophie Pitois
Centre for Environment, Fisheries and Aquaculture Science | CEFAS · Division of Environment and Ecosystems (Pelagic Science)

PhD

About

49
Publications
25,716
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,273
Citations
Additional affiliations
April 2012 - present
Centre for Environment, Fisheries and Aquaculture Science
Position
  • M1101: Evaluating shelf-wide spatial and temporal changes in fish larval distribution over the last half century in relation to environmental factors and adult distributions
January 2011 - present
Centre for Environment, Fisheries and Aquaculture Science
Position
  • MEMO (Mnemiopsis Leidyi Ecology Modelling and Observation)
August 2007 - March 2013
Centre for Environment, Fisheries and Aquaculture Science
Position
  • Demersal fish recruitment processes in the Irish Sea - generating and testing hypotheses based on high-resolution data on eggs, larvae and prey collected since 1995
Education
October 1992 - October 1996
University of Strathclyde
Field of study
  • Environmental health
September 1991 - June 1992
University of Strathclyde
Field of study
  • chemistry

Publications

Publications (49)
Article
The size, type and abundance of planktonic organisms influence the efficiency with which carbon is transferred through the lower trophic levels, ultimately affecting dynamics at the higher trophic levels of the marine food web. In temperate shelf sea, such as the waters south-west of the UK, the plankton growing season span from early spring to aut...
Article
Zooplankton play a central role in marine trophic webs, influencing both biogeochemistry and productivity of the oceans. Changes in their communities are important indicators of overall ecosystem health and global change impacts. With increasing exploitation and pressures on the marine environment, there is a growing need for high-resolution monito...
Article
Full-text available
Since 2005, the ctenophore Mnemiopsis leidyi has been reported as present in northern Europe. Although the impacts of this voracious predator on North Sea fisheries remain uncertain, it is in direct competition with fish larvae for food availability and is considered a threat to the structure and function of the marine ecosystem. M. leidyi has neve...
Article
Full-text available
Plankton form the base of the marine food web and are sensitive indicators of environmental change. Plankton time series are therefore an essential part of monitoring progress towards global biodiversity goals, such as the Convention on Biological Diversity Aichi Targets, and for informing ecosystem-based policy, such as the EU Marine Strategy Fram...
Preprint
Full-text available
Plankton form the base of the marine food web and are sensitive indicators of environmental change. Plankton time-series are therefore an essential part of monitoring progress towards global biodiversity goals, such as the Convention on Biological Diversity Aichi Targets, and for informing ecosystem-based policy, such as the EU Marine Strategy Fram...
Article
Full-text available
The threat posed by invasive non-native species worldwide requires a global approach to identify which introduced species are likely to pose an elevated risk of impact to native species and ecosystems. To inform policy, stakeholders and management decisions on global threats to aquatic ecosystems, 195 assessors representing 120 risk assessment area...
Article
Full-text available
Being located between primary producers and fish, zooplankton are a key element of marine food webs, the trophic structure of which is dependent upon the size distribution of species. Changes in zooplankton community size structure have the potential to alter the food web structure and ultimately the quality of food for planktivorous fish. Zooplank...
Article
The Plankton Imager (PI) is an underway semi-automated, high-speed imaging instrument, which takes images of all passing particles and classifies the mesozooplankton present. We used data (temperature, salinity and mesozooplankton abundance) collected in the Celtic Sea in spring and autumn from 2016 to 2019 to assess the ability of the PI to descri...
Article
Full-text available
Jellyfish are increasingly recognised as important components of the marine ecosystem, yet their specific role is poorly defined compared to that of other zooplankton groups. This paper presents the first global ocean biogeochemical model that includes an explicit representation of jellyfish and uses the model to gain insight into the influence of...
Preprint
Full-text available
Abstract. Jellyfish are increasingly recognised as important components of the marine ecosystem, yet their specific role is poorly defined compared to that of other zooplankton groups. This paper presents the first global ocean biogeochemical model that includes an explicit representation of jellyfish, and uses the model to gain insight into the in...
Article
Full-text available
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 environme...
Article
Full-text available
Extensive changes in plankton ecosystems around the British Isles over the last 60 years, including production, biodiversity and species distributions, have had effects on fisheries production and other marine life. This has been mainly driven by climate variability and ocean warming. These changes include: • Extensive changes in the planktonic eco...
Article
Harmful algae can cause death in fish, shellfish, marine mammals, and humans, via their toxins or from effects associated with their sheer quantity. There are many species, which cause a variety of problems around north-west Europe, and the frequency and distribution of algal blooms have altered in the recent past. Species distribution modelling wa...
Article
Full-text available
Aim Invasive species are of increasing global concern. Nevertheless, the mechanisms driving further distribution after the initial establishment of non‐native species remain largely unresolved, especially in marine systems. Ocean currents can be a major driver governing range occupancy, but this has not been accounted for in most invasion ecology s...
Article
Full-text available
Gelatinous zooplankton, including cnidarians, ctenophores, and tunicates (appendicularians, pyrosomes, salps and doliolids), are often overlooked by scientific studies, ecosystem assessments and at a management level. Despite the important economic consequences that they can have on human activities and on the marine food-web, arguments often relat...
Article
Full-text available
Three plankton collection methods were used to gather plankton samples in the Celtic Sea in October 2016. The Plankton Image Analysis (PIA) system is a high-speed color line scan-based imaging instrument, which continuously pumps water, takes images of the passing particles, and identifies the zooplankton organisms present. We compared and evaluate...
Article
Full-text available
Marine environmental monitoring is undertaken to provide evidence that environmental management targets are being met. Moreover, monitoring also provides context to marine science and over the last century has allowed development of a critical scientific understanding of the marine environment and the impacts that humans are having on it. The seas...
Article
Full-text available
Marine environmental monitoring has tended to focus on site-specific methods of investigation. These traditional methods have low spatial and temporal resolution and are relatively labor intensive per unit area/time that they cover. To implement the Marine Strategy Framework Directive (MSFD), European Member States are required to improve marine mo...
Article
We compared and evaluated the performance of a Continuous Automatic Litter and Plankton Sampler (CALPS) against the traditional ring net vertical haul. CALPS is a custom-made semi-automatic sampler, which collects water using a pump system at a single depth along a predetermined transect as the ship sails. CALPS underestimated species abundance com...
Article
Full-text available
Ocean Sampling Day was initiated by the EU-funded Micro B3 (Marine Microbial Biodiversity, Bioinformatics, Biotechnology) project to obtain a snapshot of the marine microbial biodiversity and function of the world’s oceans. It is a simultaneous global mega-sequencing campaign aiming to generate the largest standardized microbial data set in a singl...
Article
Full-text available
The value of the Continuous Plankton Recorder (CPR) fish larvae dataset, with its extensive spatio-temporal coverage, has been recently demonstrated with studies on long-term changes over decadal scales in the abundance and distribution of fish larvae in relation to physical and biological factors in the North Sea. We used a similar approach in the...
Technical Report
Full-text available
The ICES/CIESM Joint Workshop on Mnemiopsis Science (JWMS) chaired by Sophie Pitois (UK) and Tamara Shiganova (Russia), met in A Coruña, Spain from 18 to 20 September 2014. Scientists affiliated with the International Council for the Exploration of the Sea (ICES) and the Mediterranean Science Commission (CIESM) participated in the Joint Workshop to...
Article
We applied a physiological individual-based model for the foraging and growth of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) larvae, using observed temperature and prey fields data from the Irish Sea, collected during the 2006 spawning season. We used the model to estimate larval growth and survival and explore the different productiv...
Article
Full-text available
Recent records of the invasive ctenophore Mnemiopis leidyi A. Agassiz, 1865 in the North Sea are a cause for concern due to the detrimental effects this invader has had on fish stocks in the Black and Caspian seas. The North Sea is a major fishing ground and has spawning and nursery areas for many important fish species. These may be affected by co...
Article
Full-text available
The CPR survey records over 500 taxonomic entities and although the number of fish larvae on each sample is counted, they are not routinely identified to species or taxonomic group. The fish larvae project was an ambitious study to identify the fish larvae and transfer the results to a database incorporating the data from an earlier CPR Fish Atlas...
Article
Full-text available
Lynam, C. P., Halliday, N. C., Höffle, H., Wright, P. J., van Damme, C. J. G., Edwards, M., and Pitois, S. 2013. Spatial patterns and trends in abundance of larval sandeels in the North Sea: 1950–2005 – ICES Journal of Marine Science, 70: 540–553. Early recruitment indices based on larval fish data from the Continuous Plankton Recorder (CPR) have t...
Article
Full-text available
We present a unique view of mackerel (Scomber scombrus) in the North Sea based on a new time series of larvae caught by the Continuous Plankton Recorder (CPR) survey from 1948-2005, covering the period both before and after the collapse of the North Sea stock. Hydrographic backtrack modelling suggested that the effect of advection is very limited b...
Data
Maps of continuous plankton recorder sample locations in the spawning season May-July. a) 1948–1959. b) 1960–1974. c) 1975–1989. d) 1990–2005. (TIF)
Data
Animation of modeled annual spatial distribution of mackerel larvae caught by CPR. Color scale from white (low abundance) to red (high abundance). (SWF)
Article
Full-text available
The Continuous Plankton Recorder (CPR) dataset on fish larvae has an extensive spatio-temporal coverage that allows the responses of fish populations to past changes in climate variability, including abrupt changes such as regime shifts, to be investigated. The newly available dataset offers a unique opportunity to investigate long-term changes ove...
Conference Paper
Full-text available
The CPR survey records over 500 taxonomic entities and although it counts the number of fish larvae on each sample it does not routinely speciate this group. The fish larvae project was an ambitious study to retrospectively re-analyse CPR samples and record and speciate the findings. Throughout the history of the CPR survey something like this had...
Article
Full-text available
A changing Earth System requires knowledge on a global scale. The only way of obtaining detailed information at these scales is by using satellite remote sensing and/or modeling. In the marine environment, information on primary production (PP) is derivable from satellite data, whereas datasets of higher trophic levels are sparse. The challenge is...
Article
Full-text available
Pitois, S. G., and Fox, C. J. 2008. Empirically modelling the potential effects of changes in temperature and prey availability on the growth of cod larvae in UK shelf seas. – ICES Journal of Marine Science, 65: 1559–1572. It has been hypothesized that changes in zooplankton community structure over the past four decades led to reduced growth and s...
Article
Recent years have seen a plethora of studies reporting that ‘regime shifts’ have occurred in the North Atlantic and Pacific Oceans during the last century. In many cases, the criteria used to distinguish a regime shift have not been explicitly stated. In other cases, a formal definition has been proposed and the data set assessed against it. Develo...
Article
Full-text available
Data from the Continuous Plankton Recorder (CPR) survey over the past 40 years have shown that the abundance of copepods in many parts of the North Atlantic has declined, indicating geographical shifts in the plankton communities. Because the CPR does not sample all zooplankton species with equal efficiency, these observations may give a biased vie...
Article
Full-text available
Blooms of cyanobacteria (toxic blue-green algae) can produce health and environmental hazards in water, including water used for drinking or recreational purposes. How, why, and when these blooms are produced, as well as how to deal with them, are questions whose answers are vital to the safeguarding of public health in regions where the algae occu...
Article
Full-text available
Eutrophication of waters can lead to the development of blooms of cyanobacteria (blue-green algae) and consequent health and environmental problems. The presence of these organisms in recreational and drinking waters is generally undesirable or even hazardous, although nitrogen fixing blue-green algae can be beneficially used as biofertilisers for...
Article
Full-text available
Nutrient levels (phosphorus and nitrogen) were measured in a small reservoir in Scotland between March 1994 and October 1995. Algae species were identified. Dense blooms of Gloeotrichia echinulata have regularly occurred in late summer in the reservoir for many years, but it did not reach bloom proportions during the 1995 summer and seemed to have...

Network

Cited By

Projects

Projects (4)
Project
To develop instrumentation and software that can replace net-sampling of the mesozooplankton. Our long term goal is to not use sub-sampling techniques when analysing the image data collected, but to report on every particle imaged during sampling. The current offering is the Pi-10, see www.planktonanalytics.com for more information.