GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • underwater light field  (2)
  • Coral colonies  (1)
Publikationsart
Verlag/Herausgeber
Sprache
Erscheinungszeitraum
  • 1
    Buch
    Buch
    Dordrecht : Springer
    Schlagwort(e): Coral reef ecology ; Coral reef biology ; Coral colonies ; Coral reefs and islands ; Korallenriff ; Naturschutz ; Ökologie
    Materialart: Buch
    Seiten: IX, 552 S. , Ill., graph. Darst., Kt. , 28 cm
    ISBN: 9789400790148 , 9789400701137 , 9400701136
    RVK:
    Sprache: Englisch
    Anmerkung: Formerly CIP Uk. - Includes bibliographical references and index , Coral research : past efforts and future horizons , Remote sensing of coral reef processes , Coral taxonomy and evolution , The coral triangle , Sexual reproduction of scleractinian corals , Zooxanthellae : the yellow symbionts inside animals , Light as a source of information and energy in zooxanthellate corals , Coral calcification, cells to reefs , Coral calcification under ocean acidification and global change , Simulating and quantifying the environmental influence on coral colony growth and form , Physiological adaptation to symbiosis in cnidarians , Biogeochemistry of nutrients , The role of dissolved organic nitrogen (DON) in coral biology and reef ecology , The role of plankton in coral trophodynamics , Fish or germs? : microbial dynamics associated with changing trophic structures on coral reefs , Coral reef algae , Invertebrates and their roles in coral reef ecosystems , Coral reef fishes : opportunities, challenges and concerns , Competition among sessile organisms on coral reefs , Scaling up models of the dynamics of coral reef ecosystems : an approach for science-based management of global change , The impact of climate change on coral reef ecosystems , Coral bleaching : causes and mechanisms , The potential for temperature acclimatisation of reef corals in the face of climate change , Reef bioerosion : agents and processes , Microbial diseases of corals : pathology and ecology , Coral reef diseases in the Atlantic-Caribbean , Factors determining the resilience of coral reefs to eutrophication : a review and conceptual model , The resilience of coral reefs and its implications for reef management
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Hydrobiologia 344 (1997), S. 41-56 
    ISSN: 1573-5117
    Schlagwort(e): underwater light field ; spectral water transparency ; UV-A ; chlorophyll absorption ; natural fluorescence ; Antarctica
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The underwater light field in the Bellingshausen andAdmundsen Seas was characterised using data collectedduring the R/V Polarstern cruise ANT XI/3, from12.1.94 to 27.3.94. The euphotic zone varied from 24to 100 m depth. Spectral diffuse vertical attenuationcoefficients (K d (λ))were determined for 12narrow wavebands as well as for photosyntheticallyavailable radiation (PAR, 400–700 nm): K d (490)ranged from 0.03 to 0.26 m™1; K d (550) from0.04 to 0.17 m™1; K d (683) from 0.04 to0.17 m™1; and K d (PAR) varied from 0.02 to0.25 m™1. K d (λ) for wavelengths centred at412 nm, 443 nm, 465 nm, 490 nm, 510 nm, 520 nm and550 nm were significantly correlated with chlorophyllconcentration (ranging from 0.1 to 6 mg m™3). Thevertical attenuation coefficients for 340 nm and380 nm ranged from 0.10 to 0.69 m™1 and from 0.05to 0.34 m™1, respectively, and were also highlycorrelated with chlorophyll concentrations. These K d values indicate that the 1% penetration depthmay reach maxima of 46 m and 92 m for 340 nm and380 nm, respectively. The spectral radiancereflectances (Rr(λ)) for 443 nm, 510 nm and 550 nmwere less than 0.01 sr™1. Rr(λ) for 665 nm and683 nm increased with depth up to 0.2 sr™1 because ofchlorophyll fluorescence. Using a model that predicts downwardirradiances by taking into account the attenuation bywater and absorption by chlorophyll, we show thatchlorophyll fluorescence has a significant influenceon the red downward irradiance (E d (633, 665, 683))in deeper layers. The ability of the phytoplanktonpopulation to influence the light environment byautofluorescence and absorption processes depends onthe light conditions and on the photoacclimation ofthe cells, represented by the in vivo crosssection absorption coefficient of chlorophyll (a*). Theobtained mean chlorophyll-specific light attenuationcoefficients of phytoplankton in situ (k d ) are higherthan the in vivo absorption coefficient of chlorophyll,more than to be excepted from the scattering. a*(λ), m2 mg chl™1, decreased due topackaging effect with increasing chlorophyllconcentrations.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Hydrobiologia 316 (1995), S. 161-172 
    ISSN: 1573-5117
    Schlagwort(e): spectral water transparency ; underwater light field ; Lake Constance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract At all seasons, the underwater light field of meso-eutrophic large (480 km2) deep (mean: 100 m) Lake Constance was studied in conjunction with the assessments of vertical distributions of phytoplankton chlorophyll concentrations. Vertical profiles of scalar, downwelling and upwelling fluxes of photosynthetically available radiation, as well as fluxes of spectral irradiance between 400 and 700 nm wavelength were measured. The overall transparency of the water for PAR is highly dependent on chlorophyll concentration. However, the spectral composition of underwater light is narrowing with water depth regardless of phytoplankton biomass. Green light is transmitted best, even at extremely low chlorophyll concentrations. This is explained by the selective absorption of blue light by dissolved organic substances and red light by the water molecules. Nevertheless, significant correlations were found between vertical attenuation coefficients of downwelling spectral irradiance and chlorophyll concentrations at all wavelengths. The slopes of the regression lines were used as estimates of chlorophyll-specific spectral vertical light attenuation coefficients (K c(λ)). The proportions of total upwelling relative to total downwelling irradiance (reflectance) increased with water depth, even when phytoplankton were homogeneously distributed over the water column. Under such conditions, reflectance of monochromatic light remained constant. Lower reflectance of PAR in shallow water is explained by smaller bandwidths of upwelling relative to downwelling light near the water surface. In deeper water, by contrast, the spectra of both upwelling and downwelling irradiance are narrowed to the most penetrating components in the green spectral range. Reflectance of PAR was significantly correlated with chlorophyll concentration and varied from ∼ 1% and ∼1-% at low and high phytoplankton biomass, respectively. Over the spectrum, reflectance exhibited a maximum in the green range. Moreover, in deeper layers, a red maximum was observed which is attributed to natural fluorescence by phytoplankton chlorophyll.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...