Impact of environmental deviations on the larval and year-class abundances in the spring spawning herring (Clupea harengus membras L.) of the Gulf of Riga (Baltic Sea) in 1947–2004

Ojaveer, Evald; Arula, Timo; Lankov, Ain; Shpilev, Heli

doi:10.1016/j.fishres.2010.11.001

Cited by 21 publications

(30 citation statements)

References 15 publications

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“…2, and Fig. S3)-the latter likely through enhanced recruitment (23). The relatively low herring population at the beginning of the 1970s was likely due to high fishing pressure (Fig.…”

Section: Resultsmentioning

confidence: 97%

Predator transitory spillover induces trophic cascades in ecological sinks

Casini

Blenckner²,

Möllmann³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

104

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Understanding the effects of cross-system fluxes is fundamental in ecosystem ecology and biological conservation. Source-sink dynamics and spillover processes may link adjacent ecosystems by movement of organisms across system boundaries. However, effects of temporal variability in these cross-system fluxes on a whole marine ecosystem structure have not yet been presented. Here we show, using 35 y of multitrophic data series from the Baltic Sea, that transitory spillover of the top-predator cod from its main distribution area produces cascading effects in the whole food web of an adjacent and semi-isolated ecosystem. At varying population size, cod expand/contract their distribution range and invade/retreat from the neighboring Gulf of Riga, thereby affecting the local prey population of herring and, indirectly, zooplankton and phytoplankton via top-down control. The Gulf of Riga can be considered for cod a "true sink" habitat, where in the absence of immigration from the source areas of the central Baltic Sea the cod population goes extinct due to the absence of suitable spawning grounds. Our results add a metaecosystem perspective to the ongoing intense scientific debate on the key role of top predators in structuring natural systems. The integration of regional and local processes is central to predict species and ecosystem responses to future climate changes and ongoing anthropogenic disturbances.ecosystem regulation | predator distribution | landscape ecology | exploited resources | cross-system management

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“…2, and Fig. S3)-the latter likely through enhanced recruitment (23). The relatively low herring population at the beginning of the 1970s was likely due to high fishing pressure (Fig.…”

Section: Resultsmentioning

confidence: 97%

Predator transitory spillover induces trophic cascades in ecological sinks

Casini

Blenckner²,

Möllmann³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

104

View full text Add to dashboard Cite

show abstract

“…Recruitment success, including that of Baltic herring (Oeberst et al 2009a, Ojaveer et al 2011, depends on the number of larvae produced in a given reproductive season that survive to older ages (Houde 2008, Shepherd and Cushing 1980, Heath 1992, Nash et al 2009). Therefore, three factors are crucial for obtaining good year-classes: the availability of suitable spawning grounds, the occurrence of conditions permitting the spawning of adults, and appropriate conditions supporting the survival of eggs, hatching success, and growth and survival of larvae.…”

Section: Discussionmentioning

confidence: 99%

“…In the period 2010-2011, covered by the study, it involved the construction of the external harbour, the repair of the old breakwater, and the construction of a new 3-km-long breakwater. All those operations must have been responsi- : -1998: Years: 2007: -2011 ble for substantial sediment suspension and noise pollution (especially during pile driving). Sediment suspension can potentially affect the quality of spawning grounds by scaring the fish, dispersing spawning aggregations (Westerberg et al 1996, Engell-Sorensen andSkyt 2001), and increasing mortality of demersal eggs and small larvae (Westerberg et al 1996).…”

Section: Discussionmentioning

confidence: 99%

Abundance and distribution of larval herring, Clupea harengus (Actinopterygii: Clupeiformes: Clupeidae) in the Pomeranian Bay, Baltic Sea as an indicator of spawning sites

Fey¹

2014

Acta Ichthyol. Piscat

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“…G j -1 is a trawl index for juvenile and larval gobies (from here on: gobies) in Pärnu Bay proportional to the median of goby abundance determined by weekly Hensen trawls above the thermocline during May-July (Ojaveer et al 2011, Arula et al 2012. T j -1 refers to the average May-July air temperature in Pärnu during the year the recruits where spawned, while I j -1 is the ice duration in Pärnu Bay during their first winter; a, b, and c are model coefficients, while s() denotes nonparametric spline functions.…”

Section: Methodsmentioning

confidence: 99%