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  • 2020-2022  (73)
  • 2015-2019  (303)
  • 2000-2004  (144)
  • 1990-1994  (196)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Chichester [u.a.] : Wiley
    Call number: AWI G5-96-0262
    Type of Medium: Monograph available for loan
    Pages: XVI, 526 S.
    ISBN: 0471940437
    Branch Library: AWI Library
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  • 2
    Publication Date: 2024-03-15
    Description: The response of the marine carbon cycle to changes in atmospheric CO2 concentrations will be determined, in part, by the relative response of calcifying and non-calcifying organisms to global change. Planktonic foraminifera are responsible for a quarter or more of global carbonate production, therefore understanding the sensitivity of calcification in these organisms to environmental change is critical. Despite this, there remains little consensus as to whether, or to what extent, chemical and physical factors affect foraminiferal calcification. To address this, we directly test the effect of multiple controls on calcification in culture experiments and core-top measurements of Globigerinoides ruber. We find that two factors, body size and the carbonate system, strongly influence calcification intensity in life, but that exposure to corrosive bottom waters can overprint this signal post mortem. Using a simple model for the addition of calcite through ontogeny, we show that variable body size between and within datasets could complicate studies that examine environmental controls on foraminiferal shell weight. In addition, we suggest that size could ultimately play a role in determining whether calcification will increase or decrease with acidification. Our models highlight that knowledge of the specific morphological and physiological mechanisms driving ontogenetic change in calcification in different species will be critical in predicting the response of foraminiferal calcification to future change in atmospheric pCO2.
    Keywords: Aragonite saturation state; Area; Benthos; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification intensity; Calcification intensity, standard error; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chamber number; Chromista; Coast and continental shelf; Experiment; Foraminifera; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Globigerinoides ruber; Growth/Morphology; Heterotrophic prokaryotes; Laboratory experiment; Magnesium/Calcium ratio; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard error; Red Sea; Salinity; Single species; Species; Temperate; Temperature, water; Type
    Type: Dataset
    Format: text/tab-separated-values, 264 data points
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  • 3
    Publication Date: 2021-07-21
    Description: The mid Miocene represents an important target for paleoclimatic study because the atmospheric CO2 concentration ranged from near modern values to ∼800 ppm, while a large, dynamic Antarctic ice sheet was likely to have been present throughout much of this interval. In this special issue, Modestou et al. (2020) (doi.org/10.1029/2020PA003927) reconstruct deep ocean warmth based on the clumped isotopic composition of benthic foraminifera, a technique that allows the ice volume and thermal components of the benthic oxygen isotope stack to be separated. These data reveal a very warm deep ocean while simultaneously suggesting that continental ice volume may, at times, have been greater than today. Here, I review these results in the context of recent developments in geochemical proxies and ice sheet modeling, and explore how the presence of a large Miocene ice sheet could be reconciled with CO2 at least as high as present. More broadly, I argue that many of the 'paradoxes' that pepper the paleoclimate literature result as much from our imperfect understanding of the proxies, as from our understanding of the climate system. Robust proxies with a well‐understood mechanistic basis, as employed by Modestou et al. (2020), as well as advances in model‐data comparability usher in a new era of palaeoclimate research; an exciting future of untangling Earth's myriad past climate states awaits.
    Description: Plain Language Summary: Reconstructing climate variation in Earth's geologic past informs us of the broad features of warm climates, which is relevant to preparing for climate change over the coming centuries. Moreover, these data can be compared to state‐of‐the‐art climate models, which provides a test of the degree to which our models can reproduce warm climate states. A paper recently published in this journal applies a new method in order to reconstruct the temperature of the deep ocean in the middle Miocene (between 17 and 12 million years ago), when the atmospheric CO2 concentration was naturally similar to or higher than it is today. Coupled with decades of previous study, these exciting results depict an unfamiliar world characterized by a warm deep ocean, and yet a large ice sheet was present on Antarctica. Both models and data agree that the Antarctic ice sheet in the Miocene was highly responsive to changes in the atmospheric CO2 concentration, a clear cause of concern in the context of ongoing anthropogenic climate change.
    Description: Key Points: The importance of a paper by Modestou et al. (2020) is explained, which reports middle Miocene benthic foraminifera clumped isotope data. Ways in which a large Antarctic ice sheet can be reconciled with a warm deep ocean and moderately high CO2 are explored. More broadly, I argue that recent advances in proxy methodology are resulting in ever increasing confidence in paleoclimate reconstructions.
    Keywords: 551.787 ; clumped isotope ; deep ocean temperature ; ice volume ; miocene climatic optimum ; miocene climate transition ; oxygen isotope
    Type: article
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  • 4
    Publication Date: 2021-05-19
    Description: La Siguanea inlet, one of the two inlets present in the Gulf of Batabanó, contains essential habitats such as seagrass beds and mangroves. However, it has been poorly studied and currently there is little information about the biological diversity in the area. The aim of this study was to make the first check list of fishes on this region of the Cuban archipelago. We used complementary methodologies such as multiple seine nets, gill net, drum lines, visual census and underwater video census. The inventory recorded 122 species of fishes distributed in 53 families. The best represented families were Haemulidae, Lutjanidae, Scaridae, Carangidae, Monacanthidae and Gerreidae. This finding coincided partially with similar studies done in other Cuban shelf areas, although the order of these may vary. During the surveys a high proportion of juvenile fishes was found, which suggests a possible nursery site that could be playing an important role in fish stocks in the area. This result contributes to raise the knowledge about marine biodiversity in Cuba and also for the Caribbean, providing a baseline of fish for the area. In this work we found a high diversity of fishes in La Siguanea inlet, as well as a high proportion of juveniles. Future studies that explore the composition and structure of fish stocks in the area are required; as well as studies on the possible connectivity between this area and the reefs in Punta Francés. Allowing a better understanding of ecological processes in the area, and in turn a better use and management of these natural resources.
    Description: La Ensenada de la Siguanea es una de las dos ensenadas presentes en el Golfo de Batabanó, en la cual se pueden encontrar importantes hábitats para el desarrollo de los peces como son los pastizales y los manglares. No obstante, esta ensenada ha sido poco estudiada y se cuenta con poca información sobre la diversidad biológica en el área. El objetivo de este estudio fue realizar, por primera vez para el área, un inventario de las especies de peces. Se emplearon diferentes metodologías de muestreo como redes de pesca, palangres, censos visuales y videos bajoel agua. Se inventariaron 122 especies de peces distribuidas en 53 familias. Las familias más diversas fueron Haemulidae, Lutjanidae, Scaridae, Carangidae, Monacanthidae y Gerreidae, coincidiendo parcialmente con resultados previos en otras regiones del país, aunque su orden puede variar. En los muestreos se encontró una alta proporción de juveniles de peces, sugiriendo que esta es una zona de crianza, que puede tener un rol importante en las poblaciones de peces en el área. Estos resultados contribuyen al conocimiento de la diversidad marina en Cuba y el Caribe, proporcionado una línea base de la ictiofauna para la Ensenada de la Siguanea. En este trabajo se encontró una alta diversidad de de peces en la Siguanea, así como un elevada proporción de juveniles. Se requieren de estudios futuros que exploren la composición y estructura de las poblaciones de peces en el área, así como la posible conectividad entre esta área y el Parque Nacional Punta Francés. Esto permitirá un mejor entendimiento de los procesos ecológicos en el área, y un mejor uso y manejo de los recursos naturales.
    Description: Published
    Keywords: Diversidad ; Peces ; Inventario ; Diversity ; Fishes ; Inventory
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 29-45
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  • 5
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    In:  http://aquaticcommons.org/id/eprint/2099 | 403 | 2011-09-29 19:41:17 | 2099
    Publication Date: 2021-07-12
    Description: Health advisories are now posted in northern Florida Bay, adjacent to the Everglades, warning of high mercury concentrations in some species of gamefish. Highestconcentrations of mercury in both forage fish and gamefish have been measured in the northeastern corner of Florida Bay, adjacent to the dominant freshwater inflows from the Everglades. Thirty percent of spotted seatrout (Cynoscion nebulosus Cuvier, 1830) analyzed exceeded Florida’s no consumption level of 1.5 μg g−1 mercury in this area. We hypothesized that freshwater draining the Everglades servedas the major source of methylmercury entering the food web supporting gamefish. A lack of correlation between mercury concentrations and salinity did not support this hypothesis, although enhanced bioavailability of methylmercury is possible as freshwater is diluted with estuarine water. Stable isotopes of carbon, nitrogen, andsulfur were measured in fish to elucidate the shared pathways of methylmercury and nutrient elements through the food web. These data support a benthic source of both methylmercury and nutrient elements to gamefish within the eastern bay, as opposed to a dominant watershed source. Ecological characteristics of the eastern bay, including active redox cycling in near-surface sediments without excessive sulfide production are hypothesized to promote methylmercury formation and bioaccumulation in the benthos. Methylmercury may then accumulate in gamefish through a food web supported by benthic microalgae, detritus, pink shrimp (Farfantepenaeus duorarum Burkenroad, 1939), and other epibenthic feeders. Uncertainty remains as to the relative importance of watershed imports of methylmercury from the Everglades and in situ production in the bay, an uncertainty that needs resolution if the effects of Everglades restoration on mercury levels in fish are to be modeled and managed.
    Keywords: Ecology ; Fisheries ; Chemistry
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 321-345
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  • 6
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    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, 48, pp. e2021GL092773, ISSN: 0094-8276
    Publication Date: 2021-08-23
    Description: A quantitative analysis of any environment older than the instrumental record relies on proxies. Uncertainties associated with proxy reconstructions are often underestimated, which can lead to artificial conflict between different proxies, and between data and models. In this paper, using ordinary least squares linear regression as a common example, we describe a simple, robust and generalizable method for quantifying uncertainty in proxy reconstructions. We highlight the primary controls on the magnitude of uncertainty, and compare this simple estimate to equivalent estimates from Bayesian, nonparametric and fiducial statistical frameworks. We discuss when it may be possible to reduce uncertainties, and conclude that the unexplained variance in the calibration must always feature in the uncertainty in the reconstruction. This directs future research toward explaining as much of the variance in the calibration data as possible. We also advocate for a “data-forward” approach, that clearly decouples the presentation of proxy data from plausible environmental inferences.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 55 (1990), S. 1698-1700 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 55 (1990), S. 2280-2282 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 56 (1991), S. 4576-4579 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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