The sedimentary record of climatic and anthropogenic influence on the Patuxent estuary and Chesapeake Bay ecosystems

Cronin, Thomas M.; Vann, Cheryl D.

doi:10.1007/bf02695962

Cited by 86 publications

(74 citation statements)

References 21 publications

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“…In area column B = Baltic; D = Denmark; F = Finland; N = Norway; S = Spain; Fla = Florida; Mx = Mexico. See Brush (2001), Cronin and Vann (2003), Kemp et al (2000) and Rabalais et al (2007) Andrén et al (1999); 7) Barmawidjaja et al (1995); 8) Blackwelder et al (1996); 9) Bratton et al (2003) ; 10) Brunner (2006); 11) Cearreta et al (2000); 12) Chen et al (2001); 13) Chmura et al (2004); 14) Clarke et al (2003); 15) Clarke et al (2006); 16) Colman and Bratton (2003); 17) Cooper (1995); 18) Brush (1991, 1993); 19) Cornwell et al (1996); 20) Cronin and Vann (2003) Thomas et al (2000Thomas et al ( , 2004; 55) Toyoda and Kitazato (1995); 56) Tsujimoto et al (2006a); 57) Tsujimoto et al (2008); 58) Turner and Rabalais (1994); 59) Turner et al (2004); 60) Turner et al (2006); 61) Voss and Struck (1997); 62) Willard et al (2003); 63) Yasuhara et al (2003); 64) Yasuhara and Yamazaki (2005); 65) Yasuhara et al (2007); 66) Zheng et al (2003); 67) Zimmerman and Canuel (2000); 68) Zimmerman and Canuel (2001); 69) Zimmerman and Canuel (2002) …”

Section: Terminologyunclassified

“…Unlike foraminiferans, and in common with most crustacean taxa (e.g. Moodley et al, 1997), they usually are intolerant of hypoxia, although a few marine and brackish-water species are exceptions (Modig and Olafsson, 1998;Cronin and Vann, 2003;Whatley et al, 2003;Ruiz et al, 2005;Corbari et al, 2005). Cyprideis torosa, one of the most abundant metazoans in coastal Baltic waters, survives in sulphidic habitats by oxidizing sulphide to thiosulphate (Jahn et al, 1996).…”

Section: Benthic Ostracodamentioning

confidence: 99%

“…An important study by Cronin and Vann (2003) applied information on modern ostracod assemblages in Chesapeake Bay to reconstruct trends in salinity, dissolved oxygen and turbidity over a 500-year period based on a core obtained from the bay at the mouth of the Patuxet River (Chesapeake Bay). One particular species, Cytheromorpha curta, was able to tolerate periodic anoxia as well as high turbidity and a wide range of salinities, whereas most other species required oxygenated water but tolerated different salinity and turbidity levels.…”

Section: Benthic Ostracodamentioning

confidence: 99%

“…7b). Cronin and Vann (2003) consider the increased intensity of seasonal anoxia to be the most likely explanation for this recent faunal shift. Yasuhara et al (2007) described changes in ostracod abundance, diversity and faunal composition in four cores taken along a transect from the innermost part of Osaka Bay (Japan) near the mouth of the Yodo River, to the centre of the Bay.…”

Section: Benthic Ostracodamentioning

confidence: 99%

“…The time periods investigated range from decades to >2000 years, although the most intense human impacts generally occurred during the 20th Century. Where sedimentation rates are high, temporal resolution may be as little as a few years, at least for the 20th Century (Turner and Rabalais, 1994;Cronin and Vann, 2003). Studies of hypoxia in the sediment record began in the 1980s (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Historical records of coastal eutrophication-induced hypoxia

Jorissen²,

et al. 2009

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Abstract. Under certain conditions, sediment cores from coastal settings subject to hypoxia can yield records of environmental changes over time scales ranging from decades to millennia, sometimes with a resolution of as little as a few years. A variety of biological and geochemical indicators (proxies) derived from such cores have been used to reconstruct the development of eutrophication and hypoxic conditions over time. Those based on (1) the preserved remains of benthic organisms (mainly foraminiferans and ostracods), (2) sedimentary features (e.g. laminations) and (3) sediment chemistry and mineralogy (e.g. presence of sulphides and redox-sensitive trace elements) reflect conditions at or close to the seafloor. Those based on (4) the preserved remains of planktonic organisms (mainly diatoms and dinoflagellates), (5) pigments and lipid biomarkers derived from prokaryotes and eukaryotes and (6) organic C, N and their stable isotope ratios reflect conditions in the water column. However, the interpretation of these indicators is not straightforward. A central difficulty concerns the fact that hypoxia is strongly correlated with, and often induced by, organic enrichment caused by eutrophication, making it difficult to separate the effects of these phenomena in sediment records. The problem is compounded by the enhanced preservation in anoxic and hypoxic sediments of organic microfossils and biomarkers indicating eutrophication. The use of hypoxiaCorrespondence to: A. J. Gooday (ang@noc.soton.ac.uk) specific proxies, such as the trace metals molybdenum and rhenium and the bacterial biomarker isorenieratene, together with multi-proxy approaches, may provide a way forward. All proxies of bottom-water hypoxia are basically qualitative; their quantification presents a major challenge to which there is currently no satisfactory solution. Finally, it is important to separate the effects of natural ecosystem variability from anthropogenic effects. Despite these problems, in the absence of historical data for dissolved oxygen concentrations, the analysis of sediment cores can provide plausible reconstructions of the temporal development of humaninduced hypoxia, and associated eutrophication, in vulnerable coastal environments.

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Section: Terminologyunclassified

Section: Benthic Ostracodamentioning

confidence: 99%

Section: Benthic Ostracodamentioning

confidence: 99%

Section: Benthic Ostracodamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Historical records of coastal eutrophication-induced hypoxia

Jorissen²,

et al. 2009

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Ostracods and sea level

Cronin

2015

Handbook of Sea‐Level Research

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Human‐induced marine ecological degradation: micropaleontological perspectives

Yasuhara

Hunt

Breitburg

et al. 2012

Ecology and Evolution

109

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We analyzed published downcore microfossil records from 150 studies and reinterpreted them from an ecological degradation perspective to address the following critical but still imperfectly answered questions: (1) How is the timing of human-induced degradation of marine ecosystems different among regions? (2) What are the dominant causes of human-induced marine ecological degradation? (3) How can we better document natural variability and thereby avoid the problem of shifting baselines of comparison as degradation progresses over time? The results indicated that: (1) ecological degradation in marine systems began significantly earlier in Europe and North America (∼1800s) compared with Asia (post-1900) due to earlier industrialization in European and North American countries, (2) ecological degradation accelerated globally in the late 20th century due to post-World War II economic growth, (3) recovery from the degraded state in late 20th century following various restoration efforts and environmental regulations occurred only in limited localities. Although complex in detail, typical signs of ecological degradation were diversity decline, dramatic changes in total abundance, decrease in benthic and/or sensitive species, and increase in planktic, resistant, toxic, and/or introduced species. The predominant cause of degradation detected in these microfossil records was nutrient enrichment and the resulting symptoms of eutrophication, including hypoxia. Other causes also played considerable roles in some areas, including severe metal pollution around mining sites, water acidification by acidic wastewater, and salinity changes from construction of causeways, dikes, and channels, deforestation, and land clearance. Microfossils enable reconstruction of the ecological history of the past 102–103 years or even more, and, in conjunction with statistical modeling approaches using independent proxy records of climate and human-induced environmental changes, future research will enable workers to better address Shifting Baseline Syndrome and separate anthropogenic impacts from background natural variability.

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The sedimentary record of climatic and anthropogenic influence on the Patuxent estuary and Chesapeake Bay ecosystems

Cited by 86 publications

References 21 publications

Historical records of coastal eutrophication-induced hypoxia

Historical records of coastal eutrophication-induced hypoxia

Ostracods and sea level

Human‐induced marine ecological degradation: micropaleontological perspectives

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