Interaction of two key pelagic species in the Humboldt Current: euphausiid predation on anchoveta eggs estimated by immunoassays

Krautz, M. Cristina; Castro, L. R.; González, Margarita

doi:10.3354/meps335175

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…The polyunsaturated fatty acid 22:6(n-3) has also been found to be abundant in fish (anchoveta) eggs in times of increased dinoflagellate abundance. The presence of this fatty acid in E. vallentini (Table 2) suggests an ingestion of these type of eggs by E. vallentini, similarly to E. mucronata predation on anchoveta eggs in the Humboldt Current off central-northern Chile (Krautz et al 2007), being an additional reason for fish mortality. In contrast, the fatty acids with a terrestrial signature, such as 18:2(n-6) and 18:3(n-3) (Harwood & Russell 1984, Dalsgaard et al 2003, were very minor in E. vallentini, on average less than 1% (Table 2).…”

Section: Euphausiid Ecologymentioning

confidence: 92%

Carbon flow through the pelagic food web in southern Chilean Patagonia: relevance of Euphausia vallentini as a key species

González¹,

Graeve²,

Kattner³

et al. 2016

Mar. Ecol. Prog. Ser.

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The southernmost Patagonian region constitutes a major glaciered area with a high freshwater input loaded with particulate and dissolved matter. We assessed the relevance of the terrestrial (allochthonous) and marine (autochthonous) matter that permeates into the fjord and channel system and their possible impact on the euphausiid-based food web. A research cruise (CIMAR 16) was conducted from 18 October to 13 November 2010 (austral spring) in the area between Magellan Strait and Drake Passage to study the physical-chemical and biological characteristics of the pelagic food web, as well as the main biological processes linked with the food web. The dominance of phytoplankton within the autochthonous fractions of particulate organic carbon (POC) and the high abundance and bacterivory rate shown by the heterotrophic nanoflagellates suggest an interplay between microbial and classical food webs. Euphausia vallentini showed a moderate grazing impact (3% of the gross primary production) and a daily ration of 18.6%, and the fecal pellet production rate corresponded to 24.5% of the ingestion rate. This species removed heterotrophic prey (67.5%) preferentially over diatoms (32.5%), and the ingested diet was mainly dinoflagellates, tintinnids, crustacean nauplii and centric diatoms. Overall, euphausiids fed preferentially on marine matter, which showed a tight link with the pelagic food web. Congeneric species of the genus Euphausia shared the condition of 'key species' as they constitute a major carbon and energy flow from lower to higher trophic levels and an important part of the POC flux through their active vertical migration and passive fecal-carbon export. KEY WORDS: Chilean Patagonia · Euphausia vallentini · Pelagic carbon flux · Euphausiid dietResale or republication not permitted without written consent of the publisher

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Section: Euphausiid Ecologymentioning

confidence: 92%

Carbon flow through the pelagic food web in southern Chilean Patagonia: relevance of Euphausia vallentini as a key species

González¹,

Graeve²,

Kattner³

et al. 2016

Mar. Ecol. Prog. Ser.

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“…The dinoflagellates Noctiluca (1-2 mm in diameter) and Ichthyodinium (,0.1 mm) can be significant consumers of fish eggs. Pelagic crustaceans consumed an estimated 14% of the annual walleye pollock egg production in the western Gulf of Alaska (Bailey et al 1993) and 24% of the daily anchoveta egg production off Chile (Krautz et al 2007). In 59 samples of mackerel eggs from the northeast Atlantic, 46% were parasitized by Ichthyodinium, representing the potential loss of 11.5% of the entire mackerel egg production in that year (Meneses et al 2003).…”

Section: Beneficiaries Of Egg Boonsmentioning

confidence: 99%

Egg boons: central components of marine fatty acid food webs

Fuiman,

Connelly,

Lowerre-Barbieri

et al. 2015

Ecology

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Food web relationships are traditionally defined in terms of the flow of key elements, such as carbon, nitrogen, and phosphorus, and their role in limiting production. There is growing recognition that availability of important biomolecules, such as fatty acids, may exert controls on secondary production that are not easily explained by traditional element-oriented models. Essential fatty acids (EFAs) are required by most organisms for proper physiological function but are manufactured almost entirely by primary producers. Therefore, the flow of EFAs, especially docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), and arachidonic acid (ARA), through aquatic food webs is critical for ecosystem functioning. A meta-analysis of data on the EFA content of marine organisms reveals that individual eggs of marine animals have exceptionally high concentrations of EFAs, and that superabundances of eggs released in temporally and spatially discrete patches create rich, but temporary, nutritional resources for egg predators, called "egg boons." Mortality rates of fish eggs are disproportionately higher than animals of similar size, and those eggs are consumed by predators, both larger and smaller than the adults that produce the eggs. Thus, egg boons are a major trophic pathway through which EFAs are repackaged and redistributed, and they are among the few pathways that run counter to the main direction of trophic flow. Egg boons can transport EFAs across ecosystems through advection of patches of eggs and spawning migrations of adults. Recognizing the significance of egg boons to aquatic food webs reveals linkages and feedbacks between organisms and environments that have important implications for understanding how food webs vary in time and space. Examples are given of top-down, bottom-up, and lateral control mechanisms that could significantly alter food webs through their effects on eggs. Our results suggest that trophodynamic food web models should include EFAs generally, and egg production and egg EFA content in particular.

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“…However, predation by marine invertebrate has been largely absent from fish recruitment models although it is known that euphausiacea (Krautz et al, 2007) and chaetognatha (Terazaki, 2005) may be important causes of mortality of anchovy eggs. For example, predation by euphausiacea accounted for 24-27% of natural mortality in the Chilean anchoveta Engraulis ringens (Krautz et al, 2007) and 47-78% of the natural mortality on northern anchovy (Engraulis mordax) eggs and yolk-sac larvae (Theilacker et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Briefly, two molecular approaches have been applied intensively to detect predation in the field: (1) immunoassays and (2) DNA based assays. Although immunoassays have been used to measure predation on other anchovy species ELS (Theilacker et al, 1986(Theilacker et al, , 1993Krautz et al, 2003Krautz et al, , 2007, DNA-based methods present several advantages making them the method of choice when facing the molecular determination of diet. Briefly DNA-based methods are not only easier and cheaper to develop than immunoassays, but also allow rapid screening against a multitude of different prey likely to be encountered in the field (e.g.…”

Section: Introductionmentioning

confidence: 99%

A real-time PCR assay to estimate invertebrate and fish predation on anchovy eggs in the Bay of Biscay

Albaina

Irigoien

Aldalur

et al. 2015

Progress in Oceanography

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Interaction of two key pelagic species in the Humboldt Current: euphausiid predation on anchoveta eggs estimated by immunoassays

Cited by 19 publications

References 26 publications

Carbon flow through the pelagic food web in southern Chilean Patagonia: relevance of Euphausia vallentini as a key species

Carbon flow through the pelagic food web in southern Chilean Patagonia: relevance of Euphausia vallentini as a key species

Egg boons: central components of marine fatty acid food webs

A real-time PCR assay to estimate invertebrate and fish predation on anchovy eggs in the Bay of Biscay

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