An estimate of the percentage of non-predatory dead variability in coastal zooplankton of the southern Humboldt Current System

Krautz, M. Cristina; Hernández‐Miranda, Eduardo; Veas, Rodrigo; Bocaz, Patricia; Riquelme, P.; Quiñones, Renato A.

doi:10.1016/j.marenvres.2017.10.008

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…In a biological context, the increase of the SST, the weak circulation, and the stratification of the water column in the GA, associated with the presence of USs, affect the biological productivity because of the decrease in the advective water exchange, generating a retention area of plankton inside the protected bay and limiting the transport with the oceanic zones. In this case, USs in GA could explain why this Gulf has registered one order of magnitude higher in the total abundance of zooplankton, holoplankton, and meroplankton, mainly in summer (Krautz et al., 2017). However, more studies with a biological focus are required to evaluate these changes.…”

Section: Discussionmentioning

confidence: 99%

Upwelling Shadows Driven by the Low‐Level Jet Along the Subtropical West Coast of South America: Gulf of Arauco, Chile

et al. 2022

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Coastal wind-driven upwelling is an oceanographic process characterized by the rise of cold and nutrient-rich water to shallower ocean layers due to surface wind stress and Ekman transport (Strub et al., 1998). This process develops with higher intensity in the eastern edge zone of the oceans, known as eastern boundary upwelling systems (EBUS;Bakun & Nelson, 1991). One of the most important EBUS, in terms of its biological productivity, is present on the subtropical west coast of South America (

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Section: Discussionmentioning

confidence: 99%

Upwelling Shadows Driven by the Low‐Level Jet Along the Subtropical West Coast of South America: Gulf of Arauco, Chile

et al. 2022

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“…Plankton communities are generally composed of larval stages of vertebrates and invertebrates that are transient in this environment (meroplankton) and organisms that remain throughout their entire lifecycle in the water column, like copepods (holoplankton). The spatial and temporal variability of abundance and composition of holo-and meroplankton species are strongly dependent on local environmental conditions [33]. Knowledge of the spatial distribution of zooplankton communities, their dissimilarities and the environmental conditions of the water column, along with advective transport mechanisms in a determined area, can be a quantitative tool to characterize coastal zones (e.g.…”

Section: Open Accessmentioning

confidence: 99%

Spatial dissimilarity of zooplankton and hydrodynamic conditions in a Patagonian channel used intensely by aquaculture: the influence of a geomorphological constriction

Hernández‐Miranda

Betancourt

Sobarzo

et al. 2022

Rev. Chil. de Hist. Nat.

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Background Marine aquaculture is a very important economic and food production activity in Patagonian channels. The biophysical mechanisms through which farms interact with surrounding areas is poorly understood. A better understanding of the relationship between zooplankton distribution, hydrodynamics and aquaculture farms in Patagonian channels can contribute to the environmental sustainability of this activity. Methods The study was conducted in winter in the Caucahué Channel (Chiloé Island, southern Chile), which is composed of two asymmetric northern and southern sections separated by a geomorphological constriction (a narrows) and hosts 55 aquaculture farms. Intensive zooplankton and water column sampling (time scale: 12 h) was carried out, together with current measurements as a background of the channel hydrodynamics (time scale: 30 days). Results Spatial dissimilarities in composition and abundances of zooplankton communities and in water column variables were identified between the two sections of the channel in this short-term time scale. In the southern section we found higher abundances of holo- and meroplankton and higher species richness. No differences in zooplankton community were found between sampling sites near and far from aquaculture farms. Southward asymmetrical residual flow and semidiurnal tidal excursion were verified in the central part of the channel during two tidal fortnightly time periods. Conclusions (i) Clear dissimilarity in zooplankton composition were found between the two sections of Caucahué Channel in the time scale studied; and (ii) Quemchi geomorphological constriction and the asymmetrical southward residual flow could act as a physical barrier favoring the spatial dissimilarities found in biotic and abiotic variables between the two sections of the channel.

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“…and Paracalanus spp. at coastal sites in Chile (Krautz et al, 2017), and for Calanus finmarchicus in the Massachusetts Bay (Turner et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Environmental drivers of a decline in a coastal zooplankton community

Wells

Bresnan

Cook

et al. 2021

ICES Journal of Marine Science

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Major changes in North Atlantic zooplankton communities in recent decades have been linked to climate change but the roles of environmental drivers are often complex. High temporal resolution data is required to disentangle the natural seasonal drivers from additional sources of variability in highly heterogeneous marine systems. Here, physical and plankton abundance data spanning 2003–2017 from a weekly long-term monitoring site on the west coast of Scotland were used to investigate the cause of an increasing decline to approximately -80± 5% in annual average total zooplankton abundance from 2011 to 2017. Generalized additive mixed models (GAMMs), with an autoregressive correlation structure, were used to examine seasonal and inter-annual trends in zooplankton abundance and their relationship with environmental variables. Substantial declines were detected across all dominant taxa, with ∼ 30–70% of the declines in abundance explained by a concurrent negative trend in salinity, alongside the seasonal cycle, with the additional significance of food availability found for some taxa. Temperature was found to drive seasonal variation but not the long-term trends in the zooplankton community. The reduction in salinity had the largest effect on several important taxa. Salinity changes could partly be explained by locally higher freshwater run-off driven by precipitation as well as potential links to changes in offshore water masses. The results highlight that changes in salinity, caused by either freshwater input (expected from climate predictions) or fresher offshore water masses, may adversely impact coastal zooplankton communities and the predators that depend on them.

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An estimate of the percentage of non-predatory dead variability in coastal zooplankton of the southern Humboldt Current System

Cited by 9 publications

References 47 publications

Upwelling Shadows Driven by the Low‐Level Jet Along the Subtropical West Coast of South America: Gulf of Arauco, Chile

Upwelling Shadows Driven by the Low‐Level Jet Along the Subtropical West Coast of South America: Gulf of Arauco, Chile

Spatial dissimilarity of zooplankton and hydrodynamic conditions in a Patagonian channel used intensely by aquaculture: the influence of a geomorphological constriction

Environmental drivers of a decline in a coastal zooplankton community

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