Variability of energy density among mesozooplankton community: New insights in functional diversity to forage fish

Dessier, Aurélie; Dupuy, Corinne; Kerric, Anaïs; Mornet, Françoise; Authier, Matthieu; Bustamante, Paco; Spitz, Jérôme

doi:10.1016/j.pocean.2017.10.009

Cited by 15 publications

(11 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, higher NPP values were observed in the south than in the north and central areas. Higher NPP could thus favor a more energetic and abundant zooplankton production, and in consequence, a higher accumulation of fat reserves in sardine and anchovy during spring that would allow maintaining better body conditions during summer (Dessier et al, 2018). These differences in seasonal environmental conditions, in combination with genetic differences, could explain different phenotypic adaptations in each area.…”

Section: Latitudinalmentioning

confidence: 99%

Changes in Life History Traits of Small Pelagic Fish in the Western Mediterranean Sea

et al. 2021

View full text Add to dashboard Cite

Small pelagic fish (SPF) in the western Mediterranean Sea are key elements of the marine food web and are important in terms of biomass and fisheries catches. Significant declines in biomass, landings, and changes in the age/size structure of sardine Sardina pilchardus and anchovy Engraulis encrasicolus have been observed in recent decades, particularly in the northern area of the western Mediterranean Sea. To understand the different patterns observed in SPF populations, we analyzed key life history traits [total length at age, length at maturity, gonadosomatic index (GSI), and body condition (Kn)] of sardine and anchovy collected between 2003 and 2017, from different fishing harbors distributed along a latitudinal gradient from northern to southern Spain. We used Generalized Linear Models (GLM) to estimate the length at maturity and Generalized Additive Models (GAMs) to test the relationship with environmental variables (seawater temperature, water currents, and net primary productivity). The life history traits of both species presented seasonal, interannual and latitudinal differences with a clear decline in length at age, length at first maturity, and body condition, for both species in the northern part of the study area. In the southern part, on the contrary, life history traits did not present a clear temporal trend. The environmental conditions partially explained the long-term changes in life history traits, but the selected variables differed between areas, highlighting the importance of regional oceanographic conditions to understand the dynamics of small pelagic fish. The truncated length-at-age pattern for both species with the disappearance of the larger individuals of the population could have contributed to the poor condition of small pelagic fish populations in the northern part of the western Mediterranean Sea in recent years. In the south area, recent declines in body condition for sardine and anchovy were observed and could be a possible first sign for future population declines. This study highlights the importance of understanding the trade-off between the energy invested in reproduction, maintenance and growth at seasonal and interannual level to advance our knowledge on how environmental and human pressures influence population dynamics of small pelagic fish at local and regional scales.

show abstract

Section: Latitudinalmentioning

confidence: 99%

Changes in Life History Traits of Small Pelagic Fish in the Western Mediterranean Sea

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Consequently, increasing the consumption of T. longicornis in winter would be favored, as catching this species would come at relatively low energy cost. Furthermore, T. longicornis has a relatively low energetic value per individual [73], which may explain why it was found in large quantities to fulfil whiting energetic needs. δ 13 C values obtained in winter are consistent with a diet based on pelagic crustaceans for small size class, then switching to benthic crustaceans for intermediates and pelagic fish for largest individuals.…”

Section: Plos Onementioning

confidence: 99%

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea

et al. 2020

View full text Add to dashboard Cite

An accurate description of trophic interactions is crucial to understand ecosystem functioning and sustainably manage marine ecosystems exploitation. Carbon and nitrogen stable isotopes were coupled with stomach content analyses to investigate whiting (Merlangius merlangus, Linnaeus, 1758) feeding behavior in the Eastern English Channel and Southern North Sea. Whiting juveniles and adults were sampled in autumn and winter to investigate both ontogenetic and seasonal changes. In addition, queen scallops (Aequipecten opercularis) samples were collected along with fish to be used as isotopic benthic baseline. Results indicated an ontogenetic diet change from crustaceans to fish and cephalopods. In autumn, δ 15 N values generally increased with fish size while in winter, a decrease of δ 15 N values with fish size was observed, as a potential result of spatial variation in baseline δ 15 N values. In winter, a nutrient-poor period, an increase in feeding intensity was observed, especially on the copepod Temora longicornis. This study provides further insights into whiting trophic ecology in relation to ontogenetic and seasonal variations, and it confirms the importance of combining several trophic analysis methods to understand ecosystem functioning.

show abstract

“…Indeed, predators are known to be sensitive to the species composition of the available preys with respect to prey quality (Österblom et al, 2008;Spitz et al, 2012;Trites and Donnelly, 2003). Similarly, anchovy and sardine prey on a variety of zooplankton organisms which "cannot be considered as a homogeneous resource in terms of quality" (Dessier et al, 2017). The energetic content of zooplankton is also very variable among species, size class, area and season (Barroeta et al, 2017;Dessier et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, anchovy and sardine prey on a variety of zooplankton organisms which "cannot be considered as a homogeneous resource in terms of quality" (Dessier et al, 2017). The energetic content of zooplankton is also very variable among species, size class, area and season (Barroeta et al, 2017;Dessier et al, 2017). Energetic condition indices such as ED are also of large interest for bioenergetic modelling (Gatti et al, 2017;Hartman and Brandt, 1995;Pecquerie et al, 2009) and for food web modelling (Albo-Puigserver et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Bioenergetic condition of anchovy and sardine in the Bay of Biscay and English Channel

Gatti

Cominassi

Duhamel

et al. 2018

Progress in Oceanography

Self Cite

View full text Add to dashboard Cite

Highlights ► Exploration of energy density sources of variability: species, season, region, size. ► Relationships between dry mass content and ED are strong but species specific. ► Larger length, mass and ED at age in the English Channel than in the Bay of Biscay. ► Sardine display larger energy reserves than anchovy. ► Larger reserves are likely in link with larger spawning or maintenance costs. ► A strong scaling of ED with size with a dome shape pattern for sardine. ► Decrease of ED with size is discussed in link with feeding and spawning behaviours.

show abstract

Variability of energy density among mesozooplankton community: New insights in functional diversity to forage fish

Abstract: International audienc

Cited by 15 publications

References 55 publications

Changes in Life History Traits of Small Pelagic Fish in the Western Mediterranean Sea

Changes in Life History Traits of Small Pelagic Fish in the Western Mediterranean Sea

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea

Bioenergetic condition of anchovy and sardine in the Bay of Biscay and English Channel

Contact Info

Product

Resources

About