Zonal and depth patterns in the trophic and community structure of hyperiid amphipods in the Southeast Pacific.

Espinosa-Leal, Liliana; Bode, Antonio; Escribano, Rubén

doi:10.1016/j.dsr.2020.103402

Cited by 5 publications

(4 citation statements)

References 79 publications

(103 reference statements)

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“…Overall, stable isotope values of zooplankton differed significantly for both sub-areas and inshore vs. offshore factors considered, with δ 15 N values decreasing southward and δ 13 C showing more constant patterns across the basin but with large variability at NA. The presence of differences in isotopic signature of zooplankton between inshore and offshore locations has already been reported by other authors (Bode et al, 2003;Chouvelon et al, 2014;Espinosa-Leal et al, 2020), and it could be linked to the different contribution of terrestrial vs. marine sources of nitrogen and carbon moving from inshore to offshore waters and/or to different trophic dynamics between coastal and oceanic food webs. Here δ 13 C values were highly variable at NA (spanning from −15.9 ‰ to −22.6 ‰) in accordance with the wide array of food sources (i.e.…”

Section: Spatial Variability In the Isotopic Composition Of Mesozoopl...supporting

confidence: 66%

Spatial changes in community composition and food web structure of mesozooplankton across the Adriatic basin (Mediterranean Sea)

et al. 2022

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Abstract. Zooplankton are critical to the functioning of ocean food webs because of their utter abundance and vital ecosystem roles. Zooplankton communities are highly diverse and thus perform a variety of ecosystem functions; thus changes in the community or food web structure may provide evidence of ecosystem alteration. Assemblage structure and trophodynamics of mesozooplankton communities were examined across the Adriatic basin, the northernmost and most productive basin of the Mediterranean Sea. Samples were collected in June–July 2019 within the framework of the MEDIAS (MEDiterranean International Acoustic Survey) project, along coastal–offshore transects and from the surface to ca. 200 m depth, covering the whole western Adriatic side; consistently environmental variables were also recorded. Results showed a clear separation between samples from the northern-central Adriatic and the southern ones, with a further segregation, although less clear, of inshore vs. offshore stations, the latter being mostly dominated in the central and southern stations by gelatinous plankton. Such patterns were mainly driven, based on the outputs of the distance-based linear model, by fluorescence (as a proxy for primary production) for northern-central stations, i.e. closer to the Po River input, and by dissolved oxygen, together explaining 44 % of the total variance. Overall, at the basin level, the analysis of stable isotopes of nitrogen and carbon allowed for identifying a complex food web characterized by three trophic levels from filter feeders–herbivores to carnivores, passing through a general pattern of omnivory with varying preference towards herbivory or carnivory. Stable isotope signatures spatially varied between inshore vs. offshore communities and across sub-areas, with the northern Adriatic exhibiting greater δ15N and more variable δ13C than the other two sub-areas, likely attributable to the occurrence in the area of organic matter of both terrestrial and marine origin. Our results contribute to the knowledge of mesozooplankton community and trophic structure, at the basin scale across a coastal–offshore gradient, also providing a baseline for the future assessment of pelagic food webs within the European Council (EC) Marine Strategy Framework Directive.

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Section: Spatial Variability In the Isotopic Composition Of Mesozoopl...supporting

confidence: 66%

Spatial changes in community composition and food web structure of mesozooplankton across the Adriatic basin (Mediterranean Sea)

et al. 2022

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“…Despite the contrasting physico-chemical conditions and productivity patterns that we found across the Southeast Pacific, the trophic level of the three zooplankton size classes remained relatively constant, ranging from omnivorous to carnivorous feeding habits through the metazoan food web (Figure 4A). Each size category likely contained a wider range of TPs at the individual and species level (e.g., Espinosa-Leal et al, 2020;Massing et al, 2022), but they still represented the dominant TP of the bulk community. A higher level of carnivory was detected along the UP-CTZ region, with zooplankton TPs up to 3.5, even though these waters were expected to be dominated by herbivorous zooplankton grazing on large phytoplankon cells, which would presumably result in shorter and more efficient food webs (Dećima, 2022;Massing et al, 2022).…”

Section: Planktonic Food Web Structure Along the Productivity Gradientmentioning

confidence: 99%

“…In its western part, by contrast, the blue temperate waters of the oligotrophic gyre are considered the largest oceanic desert globally, a marine region that has suffered chronic undersampling (Appeltans et al, 2016). Although some efforts have recently been made to explore the longitudinal patterns of zooplankton biodiversity (Gonzaĺez et al, 2020;Medellıń-Mora et al, 2021), metabolism (Frederick et al, 2018) and trophic ecology (Gonzaĺez et al, 2018;Espinosa-Leal et al, 2020) across the Southeast Pacific, these either lacked enough resolution to cover the whole oceanographic gradient or were focused on the upper water column. Our current understanding of the environmental controls on planktonic food web structure in the Southeast Pacific is therefore incomplete, as is also the question of the extent to which the biological communities inhabiting the oligotrophic ocean rely on organic material synthesized in the more eutrophic waters of the Peru-Chile coastal current.…”

Section: Introductionmentioning

confidence: 99%

“…Either way, there is consensus that the trophic interactions associated with upwelling environments are more complex and dynamic than in the oligotrophic ocean, where zooplankton carnivory consistently prevails (e.g. Hunt et al, 2015;Loick-Wilde et al, 2019;Espinosa-Leal et al, 2020). Furthermore, whether zooplankton trophic ecology in the deep ocean mirrors that in the sunlit surface layer along the productivity gradient is yet to be resolved.…”

Section: Introductionmentioning

confidence: 99%

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Trophic ecology of midwater zooplankton along a productivity gradient in the Southeast Pacific

Fernández‐Urruzola

Bode²,

Loick‐Wilde³

et al. 2023

Front. Mar. Sci.

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The environmental regulation of planktonic food web structure is a key determinant for the efficiency of energy transfer through trophic levels, with direct implications for the amount of energy that is available to top-consumers and deep-sea communities. Yet, the complex trophic interplay between the different components of plankton communities under contrasting environmental conditions remains unresolved. Here, we present a comprehensive field study based on compound-specific isotope analysis of amino acids that aims to explore depth-resolved changes in the trophic strategies of various size-classes of mesozooplankton from distinct habitats across the Southeast Pacific. According to the δ15N values of the so-called source amino acids such as phenylalanine, we first identified a clear shift in nitrogen sources for biological production, from nitrate in the productive upwelling waters of the Humboldt Current System to increased inputs of diazotroph-N within the ultra-oligotrophic South Pacific gyre. These shifts in the productivity and in the source of N at the base of the food web were not accompanied by significant changes in the trophic position (TP) of mesozooplankton, which were mainly omnivores (TP = 2.8 ± 0.3, n = 65) in all ecoregions. However, although the planktonic food web length remained relatively unaltered along the productivity gradient, the microbial contribution to mid-trophic level consumers appeared to be more important at relatively high productivities, likely due to more intense remineralization processes in a late successional stage of the upwelling throughout the coastal-transition zone. Altogether, this research work will contribute to a better understanding of the food web functioning in one of the least explored marine regions of the world’s oceans.

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Mesopelagic community supported by epipelagic production in the western North Pacific Ocean based on stable isotope ratios of carbon and nitrogen

Kobari

Nakamura

Noguchi-Aita

et al. 2022

Deep Sea Research Part I: Oceanographic Research Papers

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Zonal and depth patterns in the trophic and community structure of hyperiid amphipods in the Southeast Pacific.

Cited by 5 publications

References 79 publications

Spatial changes in community composition and food web structure of mesozooplankton across the Adriatic basin (Mediterranean Sea)

Spatial changes in community composition and food web structure of mesozooplankton across the Adriatic basin (Mediterranean Sea)

Trophic ecology of midwater zooplankton along a productivity gradient in the Southeast Pacific

Mesopelagic community supported by epipelagic production in the western North Pacific Ocean based on stable isotope ratios of carbon and nitrogen

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