6,030 research outputs found
Geschichte fächerverbindend unterrichten
No full textKein Abstract vorhanden.+ ID der Publikation: phlu_11282 + Art des Beitrages: Buchkapitel/Beitrag in Sammelband + Herausgeberschaft: Karin Fuchs, Peter Gautschi, Hans Utz + Seiten: 26 - 35 + Sprache: Deutsch + Letzte Aktualisierung: 2019-10-07 11:18:5
Larval responses to turbulence and temperature in a tidal inlet: Habitat selection by dispersing gastropods?
No full textAuthor Posting. © Sears Foundation for Marine Research, 2010. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 68 (2010): 153-188, doi:10.1357/002224010793079013.Marine larval dispersal is affected by hydrodynamic transport and larval behavior, but little is known about how behavior affects large-scale patterns of dispersal and recruitment. Intertidal habitats are characterized by strong and variable turbulence relative to shelf and pelagic waters, so larval responses to turbulence may affect both dispersal and habitat selection. This study combined observations and theoretical approaches to model gastropod larval responses to multiple physical variables in a well-mixed tidal inlet. Physical measurements and larvae were collected in July 2004 in Barnstable Harbor, Massachusetts (USA). Physical measurements were incorporated in an advection-diffusion model where larval vertical velocity is a function of turbulence dissipation rate, temperature, and the temperature gradient. Modeled larval distributions were fitted to observed concentration profiles by maximum likelihood to estimate larval behavioral velocity (swimming or sinking) as a function of environmental conditions. These quantitative behavior estimates were used to test hypotheses about behavioral differences among groups and to assess the relative impact of different cues on overall larval behavior. Larvae of five common gastropod species from different coastal habitats reacted most strongly to turbulence but had genus-specific responses to environmental cues. Larvae of a species from tidal inlets (the mud snail Nassarius obsoletus) had near-zero velocities under calmer conditions and sank in strong turbulence. In contrast, larvae from exposed beach habitats (Crepidula spp. and Anachis spp.) sank in weak turbulence and swam up in strong turbulence, with additional responses to temperature and temperature gradient. Larval responses also differed between small and large size classes and between flood and ebb tides. Behavior of mud snail larvae would contribute to retention inside the inlet and near adult habitats, whereas behavior of beach snail larvae would contribute to rapid export from muddy inlets lacking suitable adult habitats.This work was funded by the Woods Hole Oceanographic Institution (WHOI) Coastal Ocean
Institute, the WHOI Rinehart Coastal Research Center, the National Science Foundation (NSF OCE-
0326734), NSF and US Office of Naval Research grants to S. Elgar and B. Raubenheimer, and the
WHOI Sea Grant (National Oceanic and Atmospheric Administration, Grant No. NA16RG2273,
project no. R/O-38-PD). Analyses were completed while HLF was a postdoctoral scholar at Scripps
Institution of Oceanography (SIO), supported by the California Current Ecosystem Long-Term Ecological
Research program (NSF OCE-0417616) and by SIO funding to P. Franks
Hans Liebeschütz Correspondence 1939-1948
No full textThis collection contains letters and postcards to the historian and professor Hans Liebeschütz after his arrival in
England in 1939. The collection contains: correspondence from Arnold Berney in Jerusalem (April to October 1939); correspondence from
Ernst Grumach in Berlin (April to August 1939); correspondence from Richard Fuchs in London and Marlborough College, April to November
1939. There is also a letter from Hans Liebeschütz on University of Liverpool stationary (where he was then a lecturer) to Robert
Weltsch (Feb. 1948).The historian Hans Liebeschütz was born 1893 in Hamburg, Germany. He embarked in a career as a teacher of medieval
history and Latin medieval literature, both at the high school level and at the University of Hamburg. When the Nazis dismissed him in
1936, he taught medieval history and Latin at the Lehranstalt für die Wissenschaft des Judentums. He emigrated to England in 1939,
where he joined his family who had emigrated earlier. In 1946, he was granted a lecturer position at the University of Liverpool. He
also wrote about Judaism beyond the Middle Ages. Hans Liebeschütz was a member of the executive board of the Leo Baeck Institute
London from time of inception. He died in England in 1978.Processed for digitizatio
Mussel larval responses to turbulence are unaltered by larvalage or light condition
No full textLarval responses to hydromechanical cues potentially have important effects on larval dispersal and settlement. This study examined the behavior of mussel larvae (Mytilus edulis) in laboratory-generated turbulence representative of nearshore currents. We video recorded the behavior of early- and late-stage veligers in a grid-stirred tank at five turbulence levels under light and dark conditions. Water velocities and kinetic energy dissipation rates were measured using particle image velocimetry and acoustic Doppler velocimetry. We characterized the vertical velocity distributions for sinking, hovering, and swimming modes in still water and calculated the average larval behavioral velocity in turbulence. In still water, young larvae had more positive (upward) velocities than old larvae, and both stages had more positive velocities in light than in dark. In turbulence, the mean larval vertical velocity varied from positive at low dissipation rates to negative at dissipation rates above a threshold of 8.3 £ 1022 cm2 s23. At this threshold, the Kolmogorov length scale (h ¼ 590mm) was two to three times the mean larval shell lengths (171–256mm), implying that turbulence is detectable even by larvae that are smaller than the smallest eddies. Responses to turbulence were unaffected by larval age or light conditions and contributed substantial behavioral variation. By sinking in strong turbulence, mussel larvae could increase their flux to the bed in energetic coastal flows, particularly over rough substrates like mussel beds. The response to turbulence by early-stage larvae will also affect their dispersal and may help larvae remain near coastal populations.Peer reviewedOriginally published in Limnology and Oceanography: Fluids & Environments (2011) and available via this link: http://lofe.dukejournals.org/content/1/120.full.pdfCopyright 2011 by the Association for the Sciences of Limnology and Oceanography, Inc
Frieda Fuchs Collection 1907-1957
No full textThe collection contains materials representing the academic career of Frieda Fuchs, from her early school years, through her doctoral studies and research into psychology in Germany, to her career in the United States. The following material is from her earlier years in Germany: grade certificates from the Grossherzogliche Seminar für Volksschullehrerinnen in Darmstadt indicating good marks (1907-1914); her teaching contract for the Israelitische Volksschule (1916), certificates confirming satisfactory studies and a diploma granting a doctoral degree from the Universtät Frankfurt am Main, in recognition of her dissertation "Experimentelle Studien über das Bewegungsnachbild" (1927-1928). The following material is from either shortly before or after her emigration to the United States: editions of her curriculum vitae (1940-1941); letters of recommendation, job correspondence and offers (1939-1942), report entitled "Von Nachbildern und ihrer Bedeutung," undated. Also included is an offprint, signed by the author, Dr. S. Hirsch, entitled "Die letzten Millimeter der arteriellen Strombahn," and two photographs of Frieda Fuchs approximately ages 30 and 50.Frieda Fuchs was born in Dieburg in 1893. She studied at the teacher's college in Darmstadt and the University in Frankfurt, receiving her doctoral degree in in 1928. From 1914 through 1940 she taught at the Israelitische Volksschule in Frankfurt am Main. She also gave classes at the Heim des Juedischen Frauenbundes in Neu-Isenburg. She immigrated to the United States in 1940 and found employment with the congregation of Rabbi Dr. Breuer in New York. At the same time she enlisted the support of the American Psychological Association Committee on Displayed Foreign Psychologists. She died in New York in 1974.Processed for digitizationdigitized2007110
Der Umgang mit dem Naturrisiko Rhein- und Moselhochwasser am Beispiel von Koblenz
No full textHans-Joachim Fuchs & Wolfgang Id
Zeitliche Niederschlagsvariationen in Stetten/Pfalz und ihre Auswirkungen auf den Naturhaushalt
No full textHans-Joachim Fuchs & Martin Werne
Klimageographische Untersuchung in der Südpfalz zur exemplarischen Quantifizierung des Klimagunstraumes um Gleisweiler
No full textHans-Joachim Fuchs & Marcus Jäge
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