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Introduction
My research investigates the environmental drivers and associated physiological responses determining biogeographical and temporal changes in zooplankton species abundance and productivity through a multidisciplinary approach. Some of my recent research has focused on the impact of climate change on the physiology of Arctic zooplankton and their capacity for rapid adaptation to ocean warming (https://www.changing-arctic-ocean.ac.uk/profile/dr-claudia-castellani/).
Additional affiliations
June 2017 - present
October 2008 - February 2017
Publications
Publications (34)
The boreal copepod Calanus finmarchicus sequesters substantial amounts of carbon (C) in the deep layers of the North Atlantic Ocean through their contribution to the “lipid pump.” This pump is driven by these zooplankton descending from the surface layers to spend prolonged periods at depth during which time they metabolise substantial lipid reserv...
The changing Arctic environment is affecting zooplankton that support its abundant wildlife. We examined how these changes are influencing a key zooplankton species, Calanus finmarchicus, principally found in the North Atlantic but expatriated to the Arctic. Close to the ice-edge in the Fram Strait, we identified areas that, since the 1980s, are in...
Warming, loss of sea icea and changes in ocean currents in the Arctic has led to biochemical changes in pelagic systems that propagate into, and disrupt the Arctic food web. The responses of plankton to environmental variability is critical in understanding how climate change may shape the structure of pelagic ecosystems in the Arctic. To further t...
The pelagic copepods Oithona similis and Calanus helgolandicus have overlapping geographic ranges, yet contrast in feeding mode, reproductive strategy and body size. We investigate how these contrasting traits influence the seasonality of copepod abundance and reproductive output under environmental variation, using time series data collected over...
We explored the small-scale behavior of the calanoid copepod Temora stylifera in relation to the diatoms Chaetoceros socialis, Leptocylindrus aporus, Leptocylindrus danicus and Pseudo-nitzschia calliantha offered as monospecific diets at similar carbon concentrations. These four diatoms are characterized by distinct size, shape and colony forming a...
A thorough understanding of planktonic organisms is the first step towards a real appreciation of the diversity, biology, and ecological importance of marine life. A detailed knowledge of their distribution and community composition is particularly important since these organisms are often very delicate and sensitive to change, and can be used as e...
A thorough understanding of planktonic organisms is the first step towards a real appreciation of the diversity, biology, and ecological importance of marine life. A detailed knowledge of their distribution and community composition is particularly important since these organisms are often very delicate and sensitive to change, and can be used as e...
A thorough understanding of planktonic organisms is the first step towards a real appreciation of the diversity, biology, and ecological importance of marine life. A detailed knowledge of their distribution and community composition is particularly important since these organisms are often very delicate and sensitive to change, and can be used as e...
A thorough understanding of planktonic organisms is the first step towards a real appreciation of the diversity, biology, and ecological importance of marine life. A detailed knowledge of their distribution and community composition is particularly important since these organisms are often very delicate and sensitive to change, and can be used as e...
We compare the long-term and seasonal patterns of abundance and phenology of the cyclopoid copepod Oithona similis at the L4 site (1988–2013) in the North Atlantic and at the LTER-MC site (1984–2013) in the Mediterranean Sea to investigate
whether high temperature limits the occurrence of this species with latitudinal cline. The two sites are well...
A report on the outputs of a workshop held in Belfast March 2011 on developing indicators and targets for the pelagic (plankton) habitat in the context of Good Environmental Status as defined by the MSFD
Here we present a new, pan-Atlantic compilation and analysis of data on C. finmarchicus abundance, demography, dormancy, egg production and mortality in relation to basin-scale patterns of temperature, phytoplankton biomass, circulation and other environmental characteristics in the context of understanding factors determining the distribution and...
Exploring climate and anthropogenic impacts to marine ecosystems requires an understanding of how trophic components interact. However, integrative end-to-end ecosystem studies (experimental and/or modelling) are rare. Experimental investigations often concentrate on a particular group or individual species within a trophic level, while tropho-dyna...
Here we present a new, pan-Atlantic compilation of data on key mesozooplankton species, including the possibly most important copepod, Calanus finmarchicus. Distributional data of ten representative zooplankton taxa, from recent (2000-2009) Continuous Plankton Recorder data, are presented, along with basin-scale data of the phytoplankton colour ind...
Copepods of the genus Calanus are key zooplankton species in temperate to arctic marine ecosystems. Despite their ecological importance, species identification remains challenging. Furthermore, the recent report of hybrids among Calanus species highlights the need for diagnostic nuclear markers in order to efficiently identify parental species and...
In the last decade, the analysis based on Continuous Plankton Recorder survey in the eastern North Atlantic Ocean detected one of the most striking examples of marine poleward migration related to sea warming. The main objective of this study is to verify the poleward shift of zooplankton species (Calanus finmarchicus, C. glacialis, C. helgolandicu...
We investigated the seasonal changes in the respiration rate of adult T. longicornis acclimatised to in situ condition over one year study. Mean (± SE) respiration rate (R) varied from 50.5 ± 2.8 nlO2 cop-1 hr-1 in December to 73.2 ± 3.53 nlO2 cop-1 hr-1 in August for copepod of body dry weight (DW) between 33.5 ± 1.1 µg and 26.3 ± 0.95 µg respecti...
A laboratory study was undertaken to determine the effect of food
quality on feeding, respiration, reproduction and the resulting carbon
budget of Temora longicornis. The stoichiometric ratios N : P, C : N and
C : P of Rhodomonas salina were used as indicators of food quality. R.
salina was grown in media with different inorganic nutrient
concentra...
This study describes phenotypic and genotypic variations in the planktonic copepod, Centropages typicus (Copepoda: Calanoida) that indicate differentiation between geographical samples. We found consistent differences in the morphology of the chela of the sexually modified fifth pereiopod (P5) of male C. typicus between samples from the Mediterrane...
Arising from D. G. Boyce, M. R. Lewis & B. Worm Nature 466, 591–596 (2010); Boyce et al. reply
Phytoplankton account for approximately 50% of global primary production, form the trophic base of nearly all marine ecosystems, are fundamental in trophic energy transfer and have key roles in climate regulation, carbon sequestration and oxygen producti...
We report evidences that the zooplankton biomass in the tropical Atlantic has declined with an almost 10-fold drop from the
1950s to 2000. The results of the multiple regression analysis showed that the decline in zooplankton biomass was positively
related to the NAO-index and to phosphate concentration. We also found that the depth of the thermocl...
As the UK's national marine data centre, a key responsibility of the British Oceanographic Data Centre (BODC) is to provide data management support for the scientific activities of complex multi-disciplinary long-term research programmes. Since the initial cruise in 1995, the NERC funded Atlantic Meridional Transect (AMT) project has undertaken 18...
The present investigation reviews published data on the feeding rates and prey selection of Oithona similis females, Calanus finmarchicus nauplii and females in the Irminger Sea in April/May and July/August 2002. Our aim was to examine how the feeding rates and prey selection of these three copepod stages respond to concomitant changes in microplan...
Oithona spp. standing stock and production is considered relatively stable in space and time as a
result of continuous breeding, low metabolism, reduced predation mortality and the ability of these
small cyclopoids to exploit microbial food webs more efficiently than larger copepods. However,
through a review of the published literature, we show th...
Net sampling within the vicinity of the Crozet archipelago, in the Indian Ocean sector of the Southern Ocean, was conducted during late spring/summer (November 2004–January 2005) to describe the composition, distribution and grazing impact of mesozooplankton, and to investigate their relationships with the prevailing oceanographic regime in the are...
The factors controlling the temporal dynamics of egg production rate (EPR) in Temora longicornis were investigated during a 3 yr study. T longicornis produced eggs all year round, with an annual maximum (EPRmax) between 27 and 48 eggs female(-1) d(-1) during spring/summer and minimum of 1.4 eggs female(-1) d(-1) in autumn/winter. The highest EPR va...
Although cyclopoids of the genus Oithona are considered the most abundant copepods
in the marine environment, there is still very little information about what sustains their population
and almost constant reproduction rate throughout the year. Feeding and egg production
rate (EPR) of O. similis were measured at coastal and oceanic stations during...
Oithona spp. is considered the most abundant and ubiquitous copepod genus in the
marine environment, often outnumbering calanoid copepods throughout the year. Previous studies
have argued that one of the reasons for such success is that the respiration rate of Oithona spp. is
insensitive to temperature changes and lower than in calanoids. However,...
Recent studies have shown that the passage from nauplius to copepodite is a key event
in the population dynamics of Calanus finmarchicus. As a first step towards understanding if and how
trophic interactions influence this event, we investigated the feeding of C. finmarchicus nauplii
IV–VI in the Irminger Sea during spring and summer in a series of...
We report here on the seasonal changes in ultramicroscopic morphology of the eggs of the calanoid copepod Temora longicornis. During a field study between 1996 and 1998 in the Menai Strait, eastern Irish Sea, T. longicornis produced two types of eggs; hatching or subitaneous eggs were spawned during autumn–winter, whereas a high proportion of non-h...