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Transient Dynamics of an Altered Large Marine Ecosystem

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Transient Dynamics of an Altered Large Marine Ecosystem LETTER doi:10.1038/nature10285 Transient dynamics of an altered large marine ecosystem Kenneth T. Frank1, Brian Petrie1, Jonathan A. D. Fisher2 & William C. Leggett2 Overfishing of large-bodied benthic fishes and their subsequent apparent alternate states in which planktivorous forage fishes and population collapses on the Scotian Shelf of Canada’s east coast1,2 macroinvertebrates became the dominant predators3. Released from and elsewhere3,4 resulted in restructuring of entire food webs now predation on the eastern Scotian Shelf, the biomass of forage fishes dominated by planktivorous, forage fish species and macroinver- increased by 900% (Fig. 1b) and macroinvertebrates by 200% com- tebrates. Despite the imposition of strict management measures in pared to the pre-collapse years13. They then competed directly with force since the early 1990s, the Scotian Shelf ecosystem has not and/or preyed upon the early life stages of their once benthic predators, reverted back to its former structure. Here we provide evidence a phenomenon termed predator–prey reversal17 which seems to be one of the transient nature of this ecosystem and its current return of the leading causes of the delayed recovery of the benthic fish com- path towards benthic fish species domination. The prolonged plex in this and other large marine ecosystems4,17,18. Although forage duration of the altered food web, and its current recovery, was fish constitute approximately half the diet of an expanding, resident and is being governed by the oscillatory, runaway consumption grey seal (Halichoerus grypus) population, estimates of their consump- dynamics of the forage fish complex. These erupting forage species, tion of pelagic fish species (1995–2000) were only 35% of the benthic which reached biomass levels 900% greater than those prevalent during the pre-collapse years of large benthic predators, are now in decline, having outstripped their zooplankton food supply. This a 14,000 b t) 3 dampening, and the associated reduction in the intensity of pre- t) dation, was accompanied by lagged increases in species abundances 3 600 12,000 at both lower and higher trophic levels, first witnessed in zooplank- 10,000 ton and then in large-bodied predators, all consistent with a return 8,000 towards the earlier ecosystem structure. We conclude that the 400 reversibility of perturbed ecosystems can occur and that this bodes 6,000 well for other collapsed fisheries. 200 4,000 The recent demonstration that overfishing of large-bodied preda- biomass (×10 Predator Forage fish biomass (×10 2,000 tors in the northwest Atlantic initiated a trophic cascade, typified by reciprocal changes in biomass between adjacent trophic levels extend- 0 0 1970 1980 1990 2000 2010 ing to the base of the food web1,2, overturned the long-held view that 1970 1980 1990 2000 2010 large marine ecosystems are resistant to restructuring5. It has been proposed6,7 that such trophic cascades are characteristic of ecosystems 100 c that have been transformed into undesirable states involving large 50 changes in ecological functions and/or economic resources8,9. 0 Benthic fish d Although the excessive consumption characteristic of trophic cascades exploitation (%) 3 6 2 may be unstable , whether, how, and on what time scales such altered, Forage fish biomass peaks 1 diverse food webs and their key species and functional groups will 0 1,3,4 recover remains unknown . This has led to controversy regarding PCA1 –1 Benthic fish Biological collapse the efficacy of and experimentation with strategies based on conven- –2 Benthic fish tional management approaches such as moratoria on exploitation, –3 increase culling and re-stocking intended to return ecosystems to their former 6 e 5.2 °C 4.8 °C 5.0 °C structure10–13. Using four decades of high quality, annual, fishery- independent data (see Methods) representative of multiple trophic 4 Bottom water levels on the eastern Scotian Shelf (Supplementary Fig. 1), we docu- 2 0–50 m temperature anomaly –0.03 °C –0.07 °C 0.3 °C ment the transient nature of its altered ecosystem and its return 0 towards dominance by large-bodied predators. Temperature (°C) Temperature –2 The collapse of the northwest Atlantic cod (Gadus morhua) and 1970 1980 1990 2000 2010 several other large predatory fishes in the early 1990s (Fig. 1a), caused principally by over-fishing14,15, precipitated the first documented open Figure 1 | Variability of the eastern Scotian Shelf ecosystem. a–e,Data ocean trophic cascade in a large marine ecosystem1. The total biomass (Supplementary Fig. 1) based on large-bodied benthic fish (a), their prey of cod, one of the ecosystem’s dominant species, has hovered at less (forage fishes, b) with estimated carrying capacity (dashed line), benthic fish exploitation history expressed as annual per cent biomass removal than 5% of pre-collapse levels for almost two decades despite the 15 (c), changing ecosystem structure based on the leading mode (PCA1) of biotic implementation of strict regulations forbidding their capture . data spanning four trophic levels and the demarcation of regimes29 of 22, 14 and 13,16 Recent investigations have provided strong evidence that, fol- 4 years duration (pink solid line) (d), and temperatures with averages shown for lowing these collapses, the eastern Scotian Shelf, and other northwest the three regimes (dashed vertical lines) (e). Vertical bars in a and b show Atlantic ecosystems in which similar collapses occurred, moved to 6s.e.m. (n 5 27). 1Ocean Sciences Division, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada. 2Department of Biology, Queen’s University, Kingston, Ontario K7L 3N6, Canada. 86 | NATURE | VOL 477 | 1 SEPTEMBER 2011 ©2011 Macmillan Publishers Limited. All rights reserved LETTER RESEARCH fish complex13 and insufficient to suppress the outbreaks and biomass 6 6,000 variability of forage fishes (Fig. 1b). a Atlantic herring The changing status of the eastern Scotian Shelf ecosystem exhibited 5,000 ) 4 t two transitions. A period of intensive fishing, when aggregate landings Northern 3 ×10 of benthic fishes averaged close to 105,000 tonnes (t) representing sand lance 4,000 ( 2 annual biomass removals of .50% (Fig. 1c), resulted in the first transi- Capelin tion centred in 1991–1992 from a ‘pre-collapse’ state dominated by 3,000 benthic fish species to a ‘collapsed’ state dominated by forage fish 1 0 species . A cod and haddock fishing moratorium implemented in 2,000 e fish biomass 1993 had the desired effect of reducing aggregate exploitation (,5% g since 2000; Fig. 1c) but did not produce the anticipated recovery –2 1,000 Fora (Supplementary Figs 2 and 3). The second transition, centred in Body weight anomaly (s.d. units) 2005–2006, represents a return towards a ‘recovering’ state of benthic –4 0 fish domination described here (Fig. 1d and Methods). An additional 1960 1970 1980 1990 2000 2010 bottom trawl survey, beginning in 1986, revealed a similar pattern of 70 2.0 collapse and recent increase in benthic fish biomass (Supplementary b Fig. 4). The physical environment during the three states, assessed using 60 ) annual bottom temperatures, 0–50 m water temperatures (Fig. 1e) and –3 1.5 water column stratification (Supplementary Information), showed 50 only minor changes. The bottom temperatures during the collapsed state were only 0.33 uC and 0.24 uC lower than during the pre-collapse 40 1.0 and recovering periods, respectively. The magnitude of this temper- lankton colour index ature change would have only minimal or no effect on individual and 30 p to population growth rates as well as other life history traits (Methods). 0.5 y Large zooplankton (m Large Further, the dominant large-scale atmospheric forcing mechanism in 20 Ph the western North Atlantic (that is, the North Atlantic Oscillation) No observations induces a bimodal response of ocean temperatures with a nodal point 10 0.0 in bottom temperature occurring in the middle of the eastern Scotian 1960 1970 1980 1990 2000 2010 19 Shelf . Consequently, the temperature response to such forcing in this Figure 2 | Physiological changes in forage fish species and resultant food region is minimal and is reflected in the dampening of regional vari- web effects. a, Species-specific body weight anomalies (stacked histograms) 20 ability in other biological properties such as species richness . and smoothed forage fish biomass (solid line; 30% LOESS; Supplementary Differences in water column temperature anomalies were also slight Fig. 8). b, Time series of large-bodied zooplankton abundance and for the three periods: on average, temperatures during the pre-collapse phytoplankton colour index (a measure of abundance) from the Continuous and collapsed periods were within 0.1 uC, during the forage fish out- Plankton Recorder survey (http://www.safhos.ac.uk). Recent (2000–2007) break temperatures were elevated by about 0.4 uC; overall, tempera- increases in large-bodied zooplankton, coincident with major reductions in tures varied over a range of about 2 uC. There was no relationship forage fish biomass shown in a, indicate a weakening of the inhibitory effects of between water column temperatures and forage fish biomass at zero the predator–prey reversal mechanism to benthic fish species recovery. lag (Supplementary Fig. 5; correlation coefficient, r 5 0.02) or for lags (forage fish biomass relative to temperature) up to four years increased abundances. The density of large-bodied zooplankton, (Methods). The minor increases in stratification occurred primarily which has varied inversely (r 520.32, n 5 22 years) with the forage during summer, outside of the peak period of phytoplankton produc- fish biomass (their principal predators), reached a broad minimum of 3 tion (Methods). The timing and magnitude of this ongoing recovery of about 17 individuals per m at the approximate peak (1994) of the the benthic fish complex was initiated and is being sustained by forage group biomass—a signature of excessive grazing.
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