Contrasting spawning temperature optima: Why are anchovy and sardine regime shifts synchronous across the North Pacific?

Takasuka, Akinori; Oozeki, Yoshioki; Kubota, Hiroshi; Lluch-Cota, Salvador E.

doi:10.1016/j.pocean.2008.03.008

Cited by 99 publications

(99 citation statements)

References 42 publications

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“…Temperature preference may be more of a correlation where certain prey may be available for sardine during weak upwelling, with usually warmer temperatures and for anchovy during strong upwelling, with usually cooler temperatures off the western margin of continents. In other regions with weaker upwelling like the Northwestern Pacific Oyashio and South Africa Agulhas extension regions, sardines and their favored prey of sardines occur during cooler conditions and anchovy and their favored prey of anchovy occur during warmer conditions [79,80]. The alternation in dominance of small pelagic species is consistent with the flow hypothesis of MacCall [81] in which periods of weak boundary current flow favor sardines and periods of strong flow and stronger upwelling favor anchovies.…”

Section: Alternations In Fish Populationssupporting

confidence: 67%

Decadal Patterns of Westerly Winds, Temperatures, Ocean Gyre Circulations and Fish Abundance: A Review

Oviatt

Smith

McManus

et al. 2015

Climate

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Abstract:The purpose of this review is to describe the global scope of the multidecadal climate oscillations that go back at least, through several hundred years. Literature, historic data, satellite data and global circulation model output have been used to provide evidence for the zonal and meridional jet stream patterns. These patterns were predominantly zonal from the 1970s to 1990s and switched since the 1990s to a meridional wind phase, with weakening jet streams forming Rossby waves in the northern and southern hemispheres. A weakened northern jet stream has allowed northerly winds to flow down over the continents in the northern hemisphere during the winter period, causing some harsh winters and slowing anthropogenic climate warming regionally. Wind oscillations impact ocean gyre circulation affecting upwelling strength and pelagic fish abundance with synchronous behavior in sub Arctic gyres during phases of the oscillation and asynchronous behavior in subtropical gyres between the Atlantic and Pacific oceans.

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Section: Alternations In Fish Populationssupporting

confidence: 67%

Decadal Patterns of Westerly Winds, Temperatures, Ocean Gyre Circulations and Fish Abundance: A Review

Oviatt

Smith

McManus

et al. 2015

Climate

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“…For this reason, the Oyashio is the main feeding grounds for many pelagic fish species (Odate 1994, Sakurai 2007. However, the distribution of these pelagic fishes is directly affected by water temperature (Oozeki et al 2007, Takasuka et al 2008b. Water temperatures of the Kuroshio-Oyashio region increase from spring to summer by solar heating and by the seasonal decrease of cold water transport of the Oyashio current (Kawai 1972, Qiu 2001.…”

Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

“…Furthermore, the distribution of pelagic fishes that shearwaters mainly feed on is affected directly by SST (Oozeki et al 2007, Takasuka et al 2008a. For example, Japanese anchovy appear to prefer particular ranges of SST (from 12 to 18°C for feeding, and from 20 to 22°C for spawning; Tsuruta & Takahashi 1997, Mihara 1998, Takasuka et al 2008b). In fact, female streaked shearwaters from both colonies appeared to favour relatively narrow ranges of SST through several months, as compared to males (Fig.…”

Section: Sex-related Differencesmentioning

confidence: 99%

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Yamamoto

Takahashi²,

Oka³

et al. 2011

Mar. Ecol. Prog. Ser.

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As the spatial distribution of marine organisms is often affected by seasonal changes, pelagic seabirds may change their foraging areas in response to seasonal changes in the marine environment. Here, we examined the foraging area of streaked shearwaters Calonectris leucomelas, breeding at Sangan (SA) and Mikura Islands (MK), Japan, from spring to summer during pre-laying and incubation periods. Those colonies are located at the north and south of the Northwestern Pacific's Kuroshio-Oyashio transition area where high seasonal temperature changes are observed, and where, consequently, birds may show comparable responses to such changes. Our results showed that streaked shearwaters from both colonies shifted their foraging areas northwards as the season progressed. The seasonal shift of foraging areas appeared to coincide with the movement pattern of pelagic fishes that migrate northward in association with the increase in water temperature. However, the pattern of seasonal movement differed between the 2 colonies; shearwaters from SA moved their foraging area along the coastal area of the Kuroshio-Oyashio transition, while those from MK moved along the Kuroshio Extension. Our results also indicated sex-related differences in this general pattern: females showed clear seasonal changes in foraging area, while males did not. During the pre-laying period males returned to the colony frequently to defend their nests or mates, and spent less time at sea. Our results suggest that streaked shearwaters changed their foraging areas in response to seasonal changes in the marine environment, although colony location and sex-related differences in reproductive roles may constrain the birds' responses to seasonal change.

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“…This theory simply posits that temperature shifts between these optima lead to shifts between the 'warm' anchovy and 'cool' sardine regimes in the western North Pacific, providing a potential explanation of why one species flourishes and the couterpart species collapses under the same ocean regime. By comparing spawning temperature optima among species, the idea was then extended to multi-species regime shifts of anchovy, sardine, mackerel Scomber japonicus and S. australasicus and jack mackerel Trachurus japonicus in the western North Pacific (Takasuka et al 2008a) and synchronous anchovy and sardine alternations on opposite sides of the North Pacific (Takasuka et al 2008b). However, no single factor or mechanism appears sufficient to fully explain observed population dynamics.…”

Section: Introductionmentioning

confidence: 99%

Spawning overlap of anchovy and sardine in the western North Pacific

Takasuka¹,

Kubota²,

Oozeki³

2008

Mar. Ecol. Prog. Ser.

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Spatial and temporal spawning overlaps in Japanese anchovy Engraulis japonicus and sardine Sardinops melanostictus were examined using a long-term data set (1978 to 2004) of monthly egg and larval surveys (total of 102 613 vertical tow samples) off the Pacific coast of Japan. Egg abundance was estimated in 15' latitude × 15' longitude squares, and spawning area was calculated by summing areas of squares positive for egg occurrence. Both species had offshore expansion (inshore contraction) of spawning grounds with protracted (shortened) spawning periods during high-(low-) biomass phases. Although anchovy and sardine had different peak spawning periods (April to July and February to March, respectively), their spawnings were coincident from February to June in coastal waters. For anchovy, annual overlapping spawning area percentages of total spawning area and egg abundances in overlapping areas as percentages of total egg abundances were consistently low (6.4 to 30.6% and 7.2 to 39.9%, respectively). In contrast, for sardine these percentages were consistently high and notably increased as population size decreased (21.1 to 80.8% and 1.4 to 86.9%, respectively). Averaged over 5 yr (2000 to 2004), 68.5% of the total area of sardine spawning grounds overlapped with anchovy spawning grounds, and 61.8% of annual sardine egg abundance was produced in spawning grounds that overlapped with anchovy. Thus, Japanese sardine population recovery is likely more difficult than Japanese anchovy population recovery (when interspecific interavtions occur).

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Contrasting spawning temperature optima: Why are anchovy and sardine regime shifts synchronous across the North Pacific?

Cited by 99 publications

References 42 publications

Decadal Patterns of Westerly Winds, Temperatures, Ocean Gyre Circulations and Fish Abundance: A Review

Decadal Patterns of Westerly Winds, Temperatures, Ocean Gyre Circulations and Fish Abundance: A Review

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Spawning overlap of anchovy and sardine in the western North Pacific

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