Tracking Baltic hypoxia and cod migration over millennia with natural tags

Limburg, Karin E.; Olson, Carina; Walther, Yvonne; Dale, Darren; Slomp, Caroline P.; Høie, Hans

doi:10.1073/pnas.1100684108

Cited by 118 publications

(102 citation statements)

References 35 publications

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“…Two-way ANOVA investigating effects on Atlantic croaker otolith mass and elemental ratios, of Treatment (control, constant hypoxia, periodic hypoxia), Sex (male, female), and the interaction of Treatment × Sex in the 10 wk hypoxia study. Significant effects (p < 0.05) are shown in bold field studies have attributed elevated otolith Mn to hypoxic redox conditions in Pamlico Sound (Thorrold & Shuttleworth 2000), Chesapeake Bay (Dorval et al 2007), and the Baltic Sea (Limburg et al 2011). The mechanism of Mn incorporation into otoliths is unclear, but substitution with Ca 2+ ions in the aragonite crystal lattice has been suggested, as Mn has not been detected bound to proteins in cod otoliths (Miller et al 2006).…”

Section: Redox-sensitive Otolith Proxiesmentioning

confidence: 99%

“…Although much otolith chemistry research has focused on chemical identifiers of migratory movements and stock discrimination (Walther & Limburg 2012), there is significant potential for geochemical indicators of hypoxia exposure to be recorded in otoliths. In particular, otolith manganese (Mn) is a viable geochemical hypoxia proxy (Limburg et al 2011). Hypoxia alters redox conditions such that Mn oxides are reduced; the reduced forms (primarily Mn 2+ but also Mn 3+ ) are soluble, and under suboxic/hypoxic conditions, dissolved Mn can be released into the water column (Thamdrup et al 1994, Slomp et al 1997) and remain dissolved for several days (Pakhomova et al 2007).…”

Section: Open Pen Access Ccessmentioning

confidence: 99%

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Influence of constant and periodic experimental hypoxic stress on Atlantic croaker otolith chemistry

Mohan¹,

Rahman²,

Thomas³

et al. 2014

Aquat. Biol.

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Section: Redox-sensitive Otolith Proxiesmentioning

confidence: 99%

Section: Open Pen Access Ccessmentioning

confidence: 99%

Influence of constant and periodic experimental hypoxic stress on Atlantic croaker otolith chemistry

Mohan¹,

Rahman²,

Thomas³

et al. 2014

Aquat. Biol.

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“…Ancient DNA (aDNA) analysis can now exploit a larger array of materials and preservational settings than previously assumed, with a temporal scope to 1 Ma (million years ago) and full paleo-genomes now within reach (42). Diet, home range, growth rate, and other life-history information are regularly reconstructed for specimens from well-dated assemblages using many of the same isotopic, elemental, and histologic (e.g., sclerochronologic) methods applied to live-collected individuals, revealing both the vulnerability of species undergoing past population bottlenecks and their unsuspected trophic and life-history flexibility (43)(44)(45)(46).…”

mentioning

confidence: 99%

Biology in the Anthropocene: Challenges and insights from young fossil records

Kidwell

2015

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

125

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With overwhelming evidence of change in habitats, biologists today must assume that few, if any, study areas are natural and that biological variability is superimposed on trends rather than stationary means. Paleobiological data from the youngest sedimentary record, including death assemblages actively accumulating on modern land surfaces and seabeds, provide unique information on the status of present-day species, communities, and biomes over the last few decades to millennia and on their responses to natural and anthropogenic environmental change. Key advances have established the accuracy and resolving power of paleobiological information derived from naturally preserved remains and of proxy evidence for environmental conditions and sample age so that fossil data can both implicate and exonerate human stressors as the drivers of biotic change and permit the effects of multiple stressors to be disentangled. Legacy effects from Industrial and even pre-Industrial anthropogenic extirpations, introductions, (de)nutrification, and habitat conversion commonly emerge as the primary factors underlying the present-day status of populations and communities; within the last 2 million years, climate change has rarely been sufficient to drive major extinction pulses absent other human pressures, which are now manifold. Young fossil records also provide rigorous access to the baseline composition and dynamics of modern-day biota under pre-Industrial conditions, where insights include the millennial-scale persistence of community structures, the dominant role of physical environmental conditions rather than biotic interactions in determining community composition and disassembly, and the existence of naturally alternating states.biodiversity | ecology | conservation | paleobiology | paleoecology

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“…Cod landings in the Baltic decline with an increase in stratification that affects the buoyancy of cod eggs so that they do not reach suitable habitat for development and with an increase in volume of hypoxic bottom-water that negatively affects survivability (9,10). A similar decrease in cod landings in the western Atlantic is potentially related to increasing nutrient loads in the St. Lawrence River estuary and subsequent hypoxia (11,12).…”

mentioning

confidence: 99%

Human impacts on fisheries across the land–sea interface

Rabalais

2015

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

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A long-held paradigm is that estuaries are important to the welfare of estuarine-dependent coastal fisheries, providing spawning areas, suitable salinity gradients for development, protection from predators, and food. Many publications link the beneficial nature of estuaries with fisheries production and decry human activities that modify habitat, and therefore potentially decrease fisheries production. However, what if the water quality of the estuary, often human-driven, results in less than suitable habitat for coastal fisheries productivity, both in the estuary and in the adjacent offshore waters? Finding the data to support relationships (positive and negative) among estuaries and coastal fisheries production is difficult because of inadequate data, highly variable data, or data with no clear linkages to processes. Hughes et al. (1), however, amassed a dense and multifaceted database of declining estuarine water quality in the form of worsening hypoxia to declines of fish diversity, reduced estuarine habitat suitability, and declines in offshore fisheries. The authors defend a plausible mechanism across the landsea interface.Relationships among hypoxic waters and fisheries productivity (either catch per unit effort or landings) remain as elusive as relationships of nitrogen loading and fisheries productivity. Efforts to understand these ocean trophic models shifted over the 20th century from agricultural models of food stimulated by nutrients that feed higher primary producer standing stocks and secondary production to concerns of higher N and P loads into water bodies, excess phytoplankton biomass, and the deleterious effects of eutrophication, including harmful algal blooms and hypoxia ( Fig. 1) (2-6).A meta-analysis by Micheli (7) of 47 food webs (natural and experimental) verified a relationship between nitrogen loading and primary production but not necessarily standing stocks of secondary consumers in the form of fisheries. Breitburg et al. (8) followed with a broad global analysis of 30 estuaries and semienclosed seas and found few strong relationships between N loading and fisheries production and hypoxia and fisheries production. Their divisions for fisheries were pelagic planktivores, benthopelagics, and benthics. Fisheries landings were positively related to N loading only for the benthopelagics and pelagics. None were related to the percent of the bottom water that was hypoxic.On more local or regional scales, however, there are documented decreases in landings or catch per unit effort with increase in area of hypoxia. Cod landings in the Baltic decline with an increase in stratification that affects the buoyancy of cod eggs so that they do not reach suitable habitat for development and with an increase in volume of hypoxic bottom-water that negatively affects survivability (9, 10). A similar decrease in cod landings in the western Atlantic is potentially related to increasing nutrient loads in the St. Lawrence River estuary and subsequent hypoxia (11,12).The bottom-waters of the northern Gulf o...

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Tracking Baltic hypoxia and cod migration over millennia with natural tags

Cited by 118 publications

References 35 publications

Influence of constant and periodic experimental hypoxic stress on Atlantic croaker otolith chemistry

Influence of constant and periodic experimental hypoxic stress on Atlantic croaker otolith chemistry

Biology in the Anthropocene: Challenges and insights from young fossil records

Human impacts on fisheries across the land–sea interface

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