GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Data_Sheet_1.docx
    Frontiers Media SA ; 2022
    In:  Frontiers in Ecology and Evolution Vol. 10 ( 2022-10-18)
    Details
    In: Frontiers in Ecology and Evolution, Frontiers Media SA, Vol. 10 ( 2022-10-18)
    Abstract: The Wadden Sea is the world’s largest intertidal ecosystem and provides vital food resources for a large number of migratory bird and fish species during seasonal stopovers. Previous work using bulk stable isotope analysis of carbon found that microphytobenthos (MPB) was the dominant resource fueling the food web with particulate organic matter making up the remainder. However, this work was unable to account for the trophic structure of the food web or the considerable increase in δ 15 N values of bulk tissue throughout the benthic food web occurring in the Eastern regions of the Dutch Wadden Sea. Here, we combine compound-specific and bulk analytical stable isotope techniques to further resolve the trophic structure and resource use throughout the benthic food web in the Wadden Sea. Analysis of δ 15 N for trophic and source amino acids allowed for better identification of trophic relationships due to the integration of underlying variation in the nitrogen resources supporting the food web. Baseline-integrated trophic position estimates using glutamic acid (Glu) and phenylalanine (Phe) allow for disentanglement of baseline variations in underlying δ 15 N sources supporting the ecosystem and trophic shifts resulting from changes in ecological relationships. Through this application, we further confirmed the dominant ecosystem support by MPB-derived resources, although to a lesser extent than previously estimated. In addition to phytoplankton-derived particulate, organic matter and MPB supported from nutrients from the overlying water column there appears to be an additional resource supporting the benthic community. From the stable isotope mixing models, a subset of species appears to focus on MPB supported off recycled (porewater) N and/or detrital organic matter mainly driven by increased phenylalanine δ 15 N values. This additional resource within MPB may play a role in subsidizing the exceptional benthic productivity observed within the Wadden Sea ecosystem and reflect division in MPB support along green (herbivory) and brown (recycled/detrital) food web pathways.
    Type of Medium: Online Resource
    ISSN: 2296-701X
    URL: Article
    URL: Article
    DOI: 10.3389/fevo.2022.951047
    DOI: 10.3389/fevo.2022.951047.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2745634-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Seasonal variation in the diet of estuarine bivalves
    Public Library of Science (PLoS) ; 2019
    In:  PLOS ONE Vol. 14, No. 6 ( 2019-6-17), p. e0217003-
    Details
    In: PLOS ONE, Public Library of Science (PLoS), Vol. 14, No. 6 ( 2019-6-17), p. e0217003-
    Type of Medium: Online Resource
    ISSN: 1932-6203
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1371/journal.pone.0217003
    DOI: 10.1371/journal.pone.0217003.g001
    DOI: 10.1371/journal.pone.0217003.g002
    DOI: 10.1371/journal.pone.0217003.g003
    DOI: 10.1371/journal.pone.0217003.g004
    DOI: 10.1371/journal.pone.0217003.g005
    DOI: 10.1371/journal.pone.0217003.g006
    DOI: 10.1371/journal.pone.0217003.g007
    DOI: 10.1371/journal.pone.0217003.g008
    DOI: 10.1371/journal.pone.0217003.g009
    DOI: 10.1371/journal.pone.0217003.t001
    DOI: 10.1371/journal.pone.0217003.t002
    DOI: 10.1371/journal.pone.0217003.t003
    DOI: 10.1371/journal.pone.0217003.t004
    DOI: 10.1371/journal.pone.0217003.s001
    DOI: 10.1371/journal.pone.0217003.s002
    DOI: 10.1371/journal.pone.0217003.s003
    DOI: 10.1371/journal.pone.0217003.s004
    Language: English
    Publisher: Public Library of Science (PLoS)
    Publication Date: 2019
    detail.hit.zdb_id: 2267670-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Trophic position, elemental ratios and nitrogen transfer in a planktonic host–parasite–consumer food chain including a fungal parasite
    Springer Science and Business Media LLC ; 2020
    In:  Oecologia Vol. 194, No. 4 ( 2020-12), p. 541-554
    Details
    In: Oecologia, Springer Science and Business Media LLC, Vol. 194, No. 4 ( 2020-12), p. 541-554
    Abstract: Parasitism is arguably the most commonly occurring consumer strategy. However, only a few food web studies assess how well stable isotopes reflect the trophic position of parasitic consumers and results are variable. Even fewer studies have measured the nutrient transfer by parasitic consumers, hindering an assessment of their role in nutrient transfer through food webs. Here we used a food chain consisting of a diatom as host, a chytrid as its parasitic consumer and a rotifer as the predatory consumer of the chytrid, to assess the trophic position of all three food-chain components using their natural 13 C and 15 N isotope signatures, and to measure the nitrogen transfer from the host via the chytrid to the rotifer by tracing 15 N of a labelled host up the food chain. Additionally, we measured the carbon to nitrogen (C:N) ratios of all food-chain components. Natural isotope abundance results showed no clear 15 N enrichment in the chytrid or rotifer relative to the primary producer. However, estimates of nitrogen transfer indicated that about 14% of host nitrogen was transferred per day from host to chytrid during infection epidemics and that some of this nitrogen was also transferred onward to the rotifer. Moreover, C:N ratios decreased with trophic level, suggesting that the chytrid provided a high-quality food source to the rotifer. In conclusion, our results support the “mycoloop”. The mycooloop proposes that chytrid infections allow the transfer of nutrients bound in large, inedible phytoplankton to zooplankton through the production of edible transmission spores, thereby rerouting nutrients back into the food web.
    Type of Medium: Online Resource
    ISSN: 0029-8549 , 1432-1939
    URL: Article
    DOI: 10.1007/s00442-020-04721-w
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 1462019-4
    detail.hit.zdb_id: 123369-5
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Carbon isotopic ratios of modern C 3 and C 4 vegetation on the Indian peninsula and changes along the plant–soil–river continuum – implications for vegetation reconstructions
    Copernicus GmbH ; 2022
    In:  Biogeosciences Vol. 19, No. 17 ( 2022-09-05), p. 4107-4127
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 19, No. 17 ( 2022-09-05), p. 4107-4127
    Abstract: Abstract. The large difference in the fractionation of stable carbon isotopes between C3 and C4 plants is widely used in vegetation reconstructions, where the predominance of C3 plants suggests wetter and that of C4 plants drier conditions. The stable carbon isotopic composition of organic carbon (OC) preserved in soils or sediments may be a valuable (paleo-)environmental indicator, based on the assumption that plant-derived material retains the stable carbon isotopic value of its photosynthetic pathway during transfer from plant to sediment. In this study, we investigated the bulk carbon isotopic values of C3 and C4 plants (δ13C) and of organic carbon (δ13Corg) in soils, river suspended particulate matter (SPM) and riverbed sediments to gain insight into the control of precipitation on C3 and C4 plant δ13C values and to assess changes in δ13Corg values along the plant–soil–river continuum. This information allows us to elucidate the implications of different δ13C end-members on C3 / C4 vegetation reconstructions. Our analysis was performed in the Godavari River basin, located in the core monsoon zone in peninsular India, a region that integrates the hydroclimatic and vegetation changes caused by variation in monsoonal strength. The basin has distinct wet and dry seasons and is characterised by natural gradients in soil type (from clay-rich to sandy), precipitation (∼ 500 to 1500 mm yr−1) and vegetation type (from mixed C3 / C4 to primarily C3) from the upper to the lower basin. The δ13C values of Godavari C3 plants were strongly controlled by mean annual precipitation (MAP), showing an isotopic enrichment of ∼ 2.2 ‰ from ∼ 1500 to 500 mm yr−1. Tracing δ13Corg values from plant to soils and rivers revealed that soils and riverbed sediments reflected the transition from mixed C3 and C4 vegetation in the dry upper basin to more C3 vegetation in the humid lower basin. Soil degradation and stabilisation processes and hydrodynamic sorting within the river altered the plant-derived δ13C signal. Phytoplankton dominated the δ13Corg signal carried by SPM in the dry season and year-round in the upper basin. Application of a linear mixing model showed that the %C4 plants in the different subbasins was ∼ 7 %–15 % higher using plant end-members based on measurement of the Godavari vegetation and tailored to local moisture availability than using those derived from data compilations of global vegetation. Including a correction for the 13C enrichment in Godavari C3 plants due to drought resulted in maximally 6 % lower estimated C4 plant cover. Our results from the Godavari basin underline the importance of making informed choices about the plant δ13C end-members for vegetation reconstructions, considering characteristics of the regional vegetation and environmental factors such as MAP in monsoonal regions.
    Type of Medium: Online Resource
    ISSN: 1726-4189
    URL: Article
    URL: Article
    DOI: 10.5194/bg-19-4107-2022
    DOI: 10.5194/bg-19-4107-2022-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2022
    detail.hit.zdb_id: 2158181-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Table_1.xlsx
    Frontiers Media SA ; 2021
    In:  Frontiers in Microbiology Vol. 12 ( 2021-5-5)
    Details
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 12 ( 2021-5-5)
    Abstract: Carbon cycling in anoxic marine sediments is dependent on uncultured microbial communities. Niches of heterotrophic microorganisms are defined by organic matter (OM) type and the different phases in OM degradation. We investigated how OM type defines microbial communities originating from organic-rich, anoxic sediments from the Baltic Sea. We compared changes in the sediment microbial community, after incubation with different stable isotope labeled OM types [i.e., particulate algal organic matter (PAOM), protein, and acetate], by using DNA stable isotope probing (DNA-SIP). Incorporation of 13 C and/or 15 N label was predominantly detected in members of the phyla Planctomycetes and Chloroflexi , which also formed the majority ( & gt;50%) of the original sediment community. While these phylum-level lineages incorporated label from all OM types, phylogenetic analyses revealed a niche separation at the order level. Members of the MSBL9 ( Planctomycetes ), the Anaerolineales ( Chloroflexi ), and the class Bathyarchaeota , were identified as initial degraders of carbohydrate-rich OM, while other uncultured orders, like the CCM11a and Phycisphaerales ( Planctomycetes ), Dehalococcoidia , and JG30-KF-CM66 ( Chloroflexi ), incorporated label also from protein and acetate. Our study highlights the importance of initial fermentation of complex carbon pools in shaping anoxic sediment microbial communities and reveals niche specialization at the order level for the most important initial degraders in anoxic sediments.
    Type of Medium: Online Resource
    ISSN: 1664-302X
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3389/fmicb.2021.628301
    DOI: 10.3389/fmicb.2021.628301.s001
    DOI: 10.3389/fmicb.2021.628301.s002
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2587354-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Tissue‐ and diet‐dependent stable carbon and nitrogen isotope discrimination: a calibration study in a captive shorebird species
    Wiley ; 2023
    In:  Journal of Avian Biology Vol. 2023, No. 9-10 ( 2023-09)
    Details
    In: Journal of Avian Biology, Wiley, Vol. 2023, No. 9-10 ( 2023-09)
    Abstract: In ecology, stable‐isotope ratios are widely used to determine diets of organisms and reconstruct food webs. This is usually done by analyzing the stable‐isotope ratios of nitrogen (δ 15 N), which increase with increasing trophic level, and those of carbon (δ 13 C), which correlate with the δ 13 C value of food source(s) and generally differ between terrestrial and marine food sources. Assimilation of food changes stable‐isotope ratios, resulting in different values between the food source and its consumer. These differences are known as isotope trophic discrimination factors and, if known, can be used to determine from the stable‐isotope ratios in the consumer's tissue what the consumer has been eating. What is often ignored is that discrimination factors can differ between consumer's food sources and also between tissue types. Therefore, we performed a controlled feeding study in red knots Calidris canutus to determine discrimination factors between different food sources and red knot tissues. We kept two groups of red knots in captivity on a stable diet, one group feeding on mudsnails and the other on Trouvit pellets, for several months, during which the birds molted their feathers. We analyzed δ 13 C and δ 15 N in both food sources and in five red knot tissues (blood cells, blood plasma and three feather types) and subsequently calculated the isotope discrimination factors. We confirmed that the discrimination factors differed between tissues, and also between diets. Our values deviated from general averages reported in reviews on a wide range of animals/birds, but were very similar to values from previous red knot and dunlin studies. We therefore think that our discrimination factors can be used in future stable isotope studies, not only on red knots, but also on other marine shorebird species and plea for careful consideration of using the right discrimination factors. Keywords: δ 13 C, δ 15 N, discrimination factor, red knot, shorebird, stable isotope
    Type of Medium: Online Resource
    ISSN: 0908-8857 , 1600-048X
    URL: Issue
    URL: Article
    DOI: 10.1111/jav.v2023.i9-10
    DOI: 10.1111/jav.03094
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2028018-X
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Reconstructing the diet, trophic level and migration pattern of mysticete whales based on baleen isotopic composition
    The Royal Society ; 2021
    In:  Royal Society Open Science Vol. 8, No. 12 ( 2021-12)
    Details
    In: Royal Society Open Science, The Royal Society, Vol. 8, No. 12 ( 2021-12)
    Abstract: Baleen from mysticete whales is a well-preserved proteinaceous material that can be used to identify migrations and feeding habits for species whose migration pathways are unknown. Analysis of δ 13 C and δ 15 N values from bulk baleen have been used to infer migration patterns for individuals. However, this approach has fallen short of identifying migrations between regions as it is difficult to determine variations in isotopic shifts without temporal sampling of prey items. Here, we apply analysis of δ 15 N values of amino acids to five baleen plates belonging to three species, revealing novel insights on trophic position, metabolic state and migration between regions. Humpback and minke whales had higher reconstructed trophic levels than fin whales (3.7–3.8 versus 3–3.2, respectively) as expected due to different feeding specialization. Isotopic niche areas between baleen minima and maxima were well separated, indicating regional resource use for individuals during migration that aligned with isotopic gradients in Atlantic Ocean particulate organic matter. Phenylanine δ 15 N values confirmed regional separation between the niche areas for two fin whales as migrations occurred and elevated glycine and threonine δ 15 N values suggested physiological changes due to fasting. Simultaneous resolution of trophic level and physiological changes allow for identification of regional migrations in mysticetes.
    Type of Medium: Online Resource
    ISSN: 2054-5703
    URL: Article
    DOI: 10.1098/rsos.210949
    Language: English
    Publisher: The Royal Society
    Publication Date: 2021
    detail.hit.zdb_id: 2787755-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Isotopic discrimination in helminths infecting coral reef fishes depends on parasite group, habitat within host, and host stable isotope value
    Springer Science and Business Media LLC ; 2021
    In:  Scientific Reports Vol. 11, No. 1 ( 2021-02-25)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 11, No. 1 ( 2021-02-25)
    Abstract: Stable isotopes of carbon and nitrogen characterize trophic relationships in predator–prey relationships, with clear differences between consumer and diet (discrimination factor Δ 13 C and Δ 15 N). However, parasite–host isotopic relationships remain unclear, with Δ 13 C and Δ 15 N remaining incompletely characterized, especially for helminths. In this study, we used stable isotopes to determine discrimination factors for 13 parasite–host pairings of helminths in coral reef fish. Differences in Δ 15 N values grouped according to parasite groups and habitat within the host with positive Δ 15 N values observed for trematodes and nematodes from the digestive tract and variable Δ 15 N values observed for cestodes and nematodes from the general cavity. Furthermore, Δ 13 C values showed more complex patterns with no effect of parasite group or habitat within host. A negative relationship was observed between Δ 15 N and host δ 15 N values among different host-parasite pairings as well as within 7 out of the 13 pairings, indicating that host metabolic processing affects host-parasite discrimination values. In contrast, no relationships were observed for Δ 13 C values. Our results indicate that parasite group, habitat within host, and host stable isotope value drive Δ 15 N of helminths in coral reef fish while their effect on Δ 13 C is more idiosyncratic. These results call for use of taxon- or species-specific and scaled framework for bulk stable isotopes in the trophic ecology of parasites.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-021-84255-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2615211-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Millennial-scale variability in Red Sea circulation in response to Holocene insolation forcing : RS CIRCULATION IN RESPONSE TO INSOLATION
    American Geophysical Union (AGU) ; 2010
    In:  Paleoceanography Vol. 25, No. 3 ( 2010-09)
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 25, No. 3 ( 2010-09)
    Type of Medium: Online Resource
    ISSN: 0883-8305
    URL: Article
    DOI: 10.1029/2009PA001826
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
    detail.hit.zdb_id: 637876-6
    detail.hit.zdb_id: 2916554-4
    SSG: 16,13
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Testing algal-based pCO2 proxies at a modern CO2 seep (Vulcano, Italy)
    Springer Science and Business Media LLC ; 2020
    In:  Scientific Reports Vol. 10, No. 1 ( 2020-06-29)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 10, No. 1 ( 2020-06-29)
    Abstract: Understanding long-term trends in atmospheric concentrations of carbon dioxide ( p CO 2 ) has become increasingly relevant as modern concentrations surpass recent historic trends. One method for estimating past p CO 2 , the stable carbon isotopic fractionation associated with photosynthesis (Ɛ p ) has shown promise over the past several decades, in particular using species-specific biomarker lipids such as alkenones. Recently, the Ɛ p of more general biomarker lipids, organic compounds derived from a multitude of species, have been applied to generate longer-spanning, more ubiquitous records than those of alkenones but the sensitivity of this proxy to changes in p CO 2 has not been constrained in modern settings. Here, we test Ɛ p using a variety of general biomarkers along a transect taken from a naturally occurring marine CO 2 seep in Levante Bay of the Aeolian island of Vulcano in Italy. The studied general biomarkers, loliolide, cholesterol, and phytol, all show increasing depletion in 13 C over the transect from the control site towards the seep, suggesting that CO 2 exerts a strong control on isotopic fractionation in natural phytoplankton communities. The strongest shift in fractionation was seen in phytol, and p CO 2 estimates derived from phytol confirm the utility of this biomarker as a proxy for p CO 2 reconstruction.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-020-67483-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2615211-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...