Top‐down pressure on a coastal ecosystem by harbor seals

Aarts, Geert; Brasseur, S.M.J.M.; Poos, Jan Jaap; Schop, Jessica; Kirkwood, Roger; Kooten, Tobias van; Mul, Evert; Reijnders, P.J.H.; Rijnsdorp, A.D.; Tulp, Ingrid

doi:10.1002/ecs2.2538

Cited by 38 publications

(35 citation statements)

References 68 publications

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“…3, Table 1) (Minagawa and Wada 1984;Newsome et al 2010). Moreover, the important proportion of pelagic sandeels in German grey seal diet and of benthic resources in German harbour seal diet (Behrends 1985;Gilles et al 2008;de la Vega et al 2016;ICES 2018;Aarts et al 2019) is confirmed by the δ 34 S vs. δ 15 N, δ 34 S vs. T-Hg and δ 34 S vs. Se plots ( Fig.…”

Section: Germanymentioning

confidence: 79%

“…This may be related to the important proportion of benthic resources such as flatfish (e.g. plaice and sole) (Behrends 1985;Gilles et al 2008;de la Vega et al 2016;ICES 2018;Aarts et al 2019) according to different stomach content and stable isotope studies on southeast bay of the North Sea. The lower δ 15 N values of German grey seals may also be related to the high proportion of sandeels in their diet mostly present in offshore areas less frequented by harbour seals (Hall et al 1998;Rindorf et al 2019).…”

Section: Germanymentioning

confidence: 99%

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Habitat and resource segregation of two sympatric seals in the North Sea

Siebert

Pomeroy

Lepoint

et al. 2021

Science of The Total Environment

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Germanymentioning

confidence: 79%

Section: Germanymentioning

confidence: 99%

Habitat and resource segregation of two sympatric seals in the North Sea

Siebert

Pomeroy

Lepoint

et al. 2021

Science of The Total Environment

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“…Marine mortality of salmonids is influenced by several factors (Sobocinski et al 2018), including body size (Berg and Jonsson 1990;Jonsson and Jonsson 2009), timing of seaward migration (Jonsson and Jonsson 2009;, feeding efficiency and growth (Kennedy et al 2008;Henderson et al 2018;Jensen et al 2018a), environmental conditions (Gosselin et al 2018) pathogens (Gargan et al 2012;Gjelland et al 2014;Skaala et al 2014;Halttunen et al 2018) as well as predation by birds (Dieperink et al 2002;Wiese et al 2008) and seals. Harbour seals (Phoca vitulina, Linnaeus 1758) are abundant in the Wadden Sea (Reijnders et al 2010) and are growing in numbers in the area (Jensen et al 2015a;Aarts et al 2019). Seal density often correlate negatively with salmonid productivity (Nelson et al 2018) and seals may threaten salmonid species (Wright et al 2007;Thomas et al 2017).…”

Section: Discussionmentioning

confidence: 99%

Investigating fish migration, mortality, and physiology to improve conservation planning of anadromous salmonids: a case study on the endangered North Sea houting (Coregonus oxyrinchus)

et al. 2019

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Understanding migratory behavior, mortality, and physiology is essential for conservation of many species, particularly anadromous fish. In this study, freshwater and marine migrations of the endangered salmonid North Sea houting (Coregonus oxyrinchus (Linnaeus, 1758)) were investigated using telemetry. Furthermore, physiological samples were collected from North Sea houting and from resident and anadromous populations of the closely related European whitefish (Coregonus lavaretus (Linnaeus, 1758)) to compare hypo-osmotic tolerances. On average, North Sea houting spent 193 days at sea where the mortality was 36%. Most fish returned from sea in the autumn, and river entry correlated inversely with river temperature and positively with discharge. Fish spent an average of 49 days in the estuarine area. Artificial lakes negatively affected migration speeds. Migration speeds did not differ consistently between individuals (i.e., not a repeatable trait) but correlated positively with water temperature. Fish arrived at spawning areas in November. In the post-spawning state, Na+/K+-ATPase activities were elevated in North Sea houting and anadromous whitefish compared with resident whitefish, while osmolality was elevated only in North Sea houting. Our study provides important information for conservation planning related to the Habitat Directive of the European Union that lists the North Sea houting as critically endangered.

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“…In 2016/2017 werden er in de Voordelta 437 gewone zeehonden en 1478 grijze zeehonden geteld (Arts et al 2018). Het is lang niet duidelijk geweest wat de gewone zeehonden in de Waddenzee eten maar daar is recent onderzoek naar gedaan aan de hand van vissen otolieten in zeehonden uitwerpselen (Aarts et al 2018). (2018) het dieet gebaseerd op otolieten.…”

Section: Zeehondenunclassified