A prey-related shift in the abundance of small pelagic fish in eastern Tasmania?

McLeod, David J.; Hobday, Alistair J.; Lyle, JM; Welsford, Dirk

doi:10.1093/icesjms/fss069

Cited by 24 publications

(12 citation statements)

References 39 publications

(54 reference statements)

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“…The absence of Jack Mackerel from the surface waters resulted in the collapse of the purse‐seine fishery near Maria Island [ Harris et al ., ]. A more recent study documented a temperature‐driven shift to a small copepod dominated zooplankton community at Maria Island; further disadvantaging Jack Mackerel, while advantaging Redbait ( Emmelichthys nitidus ) [ McLeod et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Decadal and seasonal changes in temperature, salinity, nitrate, and chlorophyll in inshore and offshore waters along southeast Australia

2015

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Sixty years of oceanographic in situ data at Port Hacking (348S) and Maria Island (428S) and 15 years of satellite-derived chlorophyll a (chl a) in inshore and offshore waters of southeast Australia show changes in the seasonality and trend of water properties consistent with long-term intensification and southerly extensions of East Australian Current (EAC) water. Decadal analyses reveal that the EAC extension water at Maria Island increased gradually from the 1940s to 1980s, followed by a rapid increase since the 1990s. This acceleration coincided with enhanced winter nitrate, implying increased injections of subantarctic water at Maria Island. Satellite-derived chl a at six coastal sites and offshore companion sites in the western Tasman Sea showed significant inshore-offshore variations in seasonal cycle and long-term trend. After 2004-2005, the Maria Island seasonal cycle became increasingly similar to those of Bass Strait and St. Helens, suggesting that the EAC extension water was extending further southward. Comparative analyses of inshore-offshore sites showed that the presence of EAC extension water declined offshore. Seasonal cycles at Maria Island show a recent shift away from the traditional spring bloom, toward increased winter biomass, and enhanced primary productivity consistent with extensions of warm, energetic EAC extension water and more frequent injections of cooler, fresher nitrate-replete waters. Overall, we find complex temporal, latitudinal, and inshore-offshore changes in multiple water masses, particularly at Maria Island, and changes in primary productivity that will profoundly impact fisheries and ecosystems.

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Section: Discussionmentioning

confidence: 99%

Decadal and seasonal changes in temperature, salinity, nitrate, and chlorophyll in inshore and offshore waters along southeast Australia

2015

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“…With time, significant alternations in biomass of sardine and anchovy catches have been noted, not only in the Adriatic Sea, but also worldwide. Recently, these stock-size fluctuations have attracted scientific attention and many studies that have taken an ecosystem-based approach have been performed, which suggest that food limitation is one of the processes that might cause these alternations in abundance (Cury et al, 2000;Agostini & Bakun, 2002;Lloret et al, 2004;Santojanni et al, 2006;McLeod et al, 2012;Zorica et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Feeding Habits and Helminth Parasites of Sardine (S. Pilchardus) and Anchovy (E. Encrasicolus) in the Adriatic Sea

et al. 2015

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We examined the stomach contents of two of the most economically and ecologically important small pelagic fish species, the sardine, Sardina pilchardus and the anchovy, Engraulis encrasicolus, obtained monthly from commercial purse-seine catches operating on Croatian fishing grounds during a one-year period (January–December, 2011). Both species generally showed a similar diet, with copepod and decapod larvae as dominant prey groups. The composition of anchovy and sardine stomach contents was not size- or sex-related, but throughout the year, a significant difference in diet composition was observed for each species as well as between species. Two gastrointerstinal helminths; the digenean Parahemiurus merus and nematode Hysterothylacium aduncum, were recorded during the stomach content analysis. Differences in population dynamics between the two parasites are congruent with differences in the prey composition of sardine and anchovy, reflecting fine-tuned interactions in the trophic web between parasites and intermediate or paratenic hosts included in the sardine and anchovy diet.

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“…However, temperature may not be the only environmental driver to induce population-level shifts. Adult population size can be strongly affected by prey availability during the late larval and early juvenile stages (McLeod et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Warming shelf seas drive the subtropicalization of European pelagic fish communities

Montero‐Serra

Edwards

Genner

2014

Global Change Biology

104

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Pelagic fishes are among the most ecologically and economically important fish species in European seas. In principle, these pelagic fishes have potential to demonstrate rapid abundance and distribution shifts in response to climatic variability due to their high adult motility, planktonic larval stages, and low dependence on benthic habitat for food or shelter during their life histories. Here, we provide evidence of substantial climate-driven changes to the structure of pelagic fish communities in European shelf seas. We investigated the patterns of species-level change using catch records from 57,870 fisheries-independent survey trawls from across European continental shelf region between 1965 and 2012. We analysed changes in the distribution and rate of occurrence of the six most common species, and observed a strong subtropicalization of the North Sea and Baltic Sea assemblages. These areas have shifted away from cold-water assemblages typically characterized by Atlantic herring and European sprat from the 1960s to 1980s, to warmer-water assemblages including Atlantic mackerel, Atlantic horse mackerel, European pilchard and European anchovy from the 1990s onwards. We next investigated if warming sea temperatures have forced these changes using temporally comprehensive data from the North Sea region. Our models indicated the primary driver of change in these species has been sea surface temperatures in all cases. Together, these analyses highlight how individual species responses have combined to result in a dramatic subtropicalization of the pelagic fish assemblage of the European continental shelf.

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A prey-related shift in the abundance of small pelagic fish in eastern Tasmania?

Cited by 24 publications

References 39 publications

Decadal and seasonal changes in temperature, salinity, nitrate, and chlorophyll in inshore and offshore waters along southeast Australia

Decadal and seasonal changes in temperature, salinity, nitrate, and chlorophyll in inshore and offshore waters along southeast Australia

Feeding Habits and Helminth Parasites of Sardine (S. Pilchardus) and Anchovy (E. Encrasicolus) in the Adriatic Sea

Warming shelf seas drive the subtropicalization of European pelagic fish communities

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