Community response of zooplankton to oceanographic changes (2002–2012) in the central/southern upwelling system of Chile

Medellín-Mora, Johanna; Escribano, Rubén; Schneider, Wolfgang

doi:10.1016/j.pocean.2016.01.005

Cited by 21 publications

(12 citation statements)

References 48 publications

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“…These more typical community responses have been shown to occur in mesoscale eddies in the NPSG (Landry et al, ) and in the North Atlantic subtropical gyre (Goldthwait & Steinberg, ), where shifts in phytoplankton size structure are reflected in increased mesozooplankton biomass and larger organisms. Our results also do not agree with the negative relationships between zooplankton size diversity and productivity in the East China Sea (García‐Comas et al, ) and Chilean upwelling systems (Medellín‐Mora et al, ), where shifts toward smaller zooplankton (juveniles) occur in response to productivity pulses. While we did not find a relationship (linear or nonlinear) between NB‐SS slopes and PP, Sprules and Barth () have observed that the NB‐SS index is not always sensitive to productivity changes, as, for example, in the East China Sea (García‐Comas et al, ).…”

Section: Discussioncontrasting

confidence: 97%

“…In dynamic regions of the oceans, variability in system productivity is well demonstrated to modulate significant shifts in the size structure of zooplankton communities (Décima et al, ; Manríquez et al, ; Medellín‐Mora et al, ; Rykaczewski & Checkley, ). While the magnitudes of environmental variability are much smaller in the subtropical open oceans (Quiñones et al, ; Rodríguez & Mullin, ; Sprules & Munawar, ), here we show that systematic changes in size structure can also occur in such systems.…”

Section: Discussionmentioning

confidence: 99%

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Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre

Valencia

Décima

Landry

2018

Global Biogeochemical Cycles

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Using size‐fractionated mesozooplankton biomass data collected over 23 years (1994–2016) of increasing primary production (PP) at station ALOHA (A Long‐Term Oligotrophic Habitat Assessment), we evaluate how changing environmental conditions affect mesozooplankton size structure, trophic cycling, and export fluxes in the subtropical North Pacific. From generalized additive model analysis, size structure is significantly influenced by a nonlinear relationship with sea surface temperature that is mainly driven by the strong 1997–1998 El Niño and a positive and linear relationship with PP. Increasing PP has more strongly enhanced the biomass of smaller (0.2–0.5 mm) and larger (>5 mm) mesozooplankton, increasing evenness of the biomass spectra, while animals of 2–5 mm, the major size class for vertically migrating mesozooplankton, show no long‐term trend. Measured PP is sufficient to meet feeding requirements that satisfy mesozooplankton respiration and growth rates, as determined by commonly used empirical relationships based on animal size and temperature, consistent with a tightly coupled food web with one intermediate level for protistan consumers. Estimated fecal pellet production suggests an enhanced contribution of mesozooplankton to passive particle export relative to the material collected in 150 m sediment traps. In contrast, the biomass of vertically migrants does not vary systematically with PP due to the varying responses of the different size classes. These results illustrate some complexities in understanding how varying environmental conditions can affect carbon cycling and export processes at the community level in open‐ocean oligotrophic systems, which need to be confirmed and better understood by process‐oriented mechanistic study.

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Section: Discussioncontrasting

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre

Valencia

Décima

Landry

2018

Global Biogeochemical Cycles

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“…ovigerous females) and the early stages of the life cycle (i.e. eggs and larvae) are exposed to the seasonal variations in temperature (Medellín‐Mora, Escribano, & Schneider, ) and food availability (i.e. quantity of organic matter; Guiñez, Valdés, & Siffedine, ), and in the amounts of chlorophyll (Morales et al., ) and zooplankton in the water column (Anabalón, Morales, Escribano, & Varas, ; Bottjer & Morales, ; Escribano, Hidalgo, Fuentes, & Donoso, ; Escribano & Schneider, ) that occur in temperate regions such as the Chilean coast.…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in the biochemical composition of females and offspring of red squat lobster, Pleuroncodes monodon (Decapoda, Munididae), from the Southeastern Pacific

et al. 2017

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Pleuroncodes monodon is an important fishery resource and key species from the Southeastern Pacific. During its prolonged reproductive period (from February to December), ovigerous females are exposed to seasonal variation in environmental factors (e.g. temperature and food availability), with higher levels of these environmental parameters during summer and lower in winter, and must adjust their biochemistry to ensure their own survival and that of their embryos. The aim of this study was to analyse seasonal changes in the biochemical composition of ovigerous females and their eggs. The data show that the content of lipids, proteins and organic matter in the hepatopancreases of females was significantly higher in winter than in summer.Similarly, the lipid content of the eggs was significantly higher in winter than in summer, yet the protein content of the eggs had the opposite pattern with greater values found in summer. Consistent with the 'reproductive energetic model', the initial and final energy produced by the hepatopancreas showed significant seasonal variations, whereas female investment in egg production (in absolute values) did not show significant seasonal differences. The seasonal differences observed in the biochemistry, organic matter and energy content of the female hepatopancreases may be related to the storage of energy for growth and reproduction. Furthermore, the seasonal variation in the content of lipids, proteins and energy in eggs is likely related to embryogenesis and larval hatching in function with environmental conditions. Seasonal variation in the biochemical composition of P. monodon has direct effects on the marine food web and also upon fisheries.

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“…These studies provide insight into the characteristics of the ecosystem as a whole but provide little understanding of the structure and function of the particular biological communities of direct importance to planktivorous fish. However, continued development of zooplankton imaging methodologies and their application to process zooplankton collected during regular oceanographic surveys has fostered insight into the relationships among hydrographic processes, biogeochemical conditions, and mesozooplankton size spectra and the potential implications for fish recruitment (Grosjean et al 2004, Irigoien et al 2009, Manriquez et al 2009, Medellin-Mora et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Changes in mesozooplankton size structure along a trophic gradient in the California Current Ecosystem and implications for small pelagic fish

Rykaczewski¹

2019

Mar. Ecol. Prog. Ser.

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Community response of zooplankton to oceanographic changes (2002–2012) in the central/southern upwelling system of Chile

Cited by 21 publications

References 48 publications

Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre

Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre

Seasonal changes in the biochemical composition of females and offspring of red squat lobster, Pleuroncodes monodon (Decapoda, Munididae), from the Southeastern Pacific

Changes in mesozooplankton size structure along a trophic gradient in the California Current Ecosystem and implications for small pelagic fish

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