| |
Einträge |
Verweise |
|
Autor |
Ebel, G. |
|
| |
Titel |
Habitatansprüche und Verhaltensmuster der Äsche Thymallus thymallus (Linnaeus 1758) |
Typ |
Buch |
| |
Jahr |
2000 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
64 |
|
| |
Schlüsselwörter |
Fisch, Äsche, Thymallus thymallus, Biologie, Habitat, Verhalten, Fortpflanzung |
|
| |
Zusammenfassung |
|
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber  |
|
Erscheinungsort |
Halle (Saale) |
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
3-00-005928-8 |
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
|
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
383 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Ernst, T. |
|
| |
Titel |
Der Salmenfang bei St. Goar und St. Goarshausen im 18. Jahrhundert |
Typ |
Buch |
| |
Jahr |
1932 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
|
|
| |
Schlüsselwörter |
|
|
| |
Zusammenfassung |
|
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
Alt-Nassau |
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
|
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
405 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Fotland, A.; Mehl, S.; Sunnanaa, K. |
|
| |
Titel |
Methods of index calculation and presentation of fish abundance data using standard computer programs |
Typ |
Buch |
| |
Jahr |
1995 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
|
|
| |
Schlüsselwörter |
fishery-management; fishery-statistics; stock-assessment |
|
| |
Zusammenfassung |
Standard 0-group indices and distribution maps are now produced based on hand-drawn maps using AutoCad with some additional procedures. This paper briefly describes the method. The paper further describes ways of importing coastlines and survey data directly into standard computer programs such as AutoCad and SAS. Standard methods are used for gridding data, producing isolines and further calculation of abundance indices and presentation of distributions. Interactive editing of distribution maps are made, which makes corresponding automatic updating of indices possible. |
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
|
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
Zu bestellen |
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
435 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Frank, C.; Jungbluth, J. H.; Richnovszky, A. |
|
| |
Titel |
Die Mollusken der Donau vom Schwarzwald bis zum Schwarzen Meer |
Typ |
Buch |
| |
Jahr |
1990 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
142 |
|
| |
Schlüsselwörter |
Muschel |
|
| |
Zusammenfassung |
|
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
Budapest |
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
|
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
436 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
He, X. |
|
| |
Titel |
Effects of predation on a fish community: A whole lake experiment |
Typ |
Buch |
| |
Jahr |
1990 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
|
|
| |
Schlüsselwörter |
predation-; interspecific-relationships; freshwater-fish; population-dynamics; Esox-lucius; Phoninus-eos; Lepomis-; Semotilus-atromaculatus; freshwater-ecology |
|
| |
Zusammenfassung |
Studies of predator-prey interactions have been limited to laboratories or relatively small scale field experiments because of logistic difficulties in large scale field experiments. Much evidence has suggested that predictions based on small scale experiments on predator-prey interactions may not be simply extended to large scales, e.g. whole system. This study was designed to examine predation effects on a prey fish assemblage at the whole lake scale. After a year of premanipulation study, northern pike (Esox lucius) were introduced into a small piscivore-free lake inhabited by 14 species of fishes. In the third and fourth years, the lake was divided by a large mesh fence and northern pike were introduced into one half of the lake. Predation effects on individual prey population were estimated for both direct effects (i.e., consumption of prey species) and indirect effects, including habitat changes associated with predator avoidance behavior, increase of emigration rates and changes of population size structure. The relative importance of direct versus indirect effects was examined using randomized intervention analysis along with a model that quantifies the indirect effects. Decreases of prey fish biomass due to increased emigration was at least as great as that due to the direct effect of consumption when prey biomass was high (>40 kg/ha) but not when prey biomass was low (<30 kg/ha). Significant indirect effects included dramatically decreased abundance of the dominant species (northern redbelly dace, Phoxinus eos), increase of some rare species (sunfish, Lepomis spp. and creek chub, Semotilus atromaculatus), and decreased mean sizes of redbelly dace. Indirect effects occurred rapidly and were most apparent immediately following the introduction of northern pike. Community responses to northern pike predation included changes of species composition, species diversity and community stabilities. The fish communities were significantly different among the pre-pike period, pike period and post-pike period. The greatest variance was related to abundances of redbelly dace and sunfish. However, predation effects on the prey fish community depended on the observational scales used to determine community structure. (DBO) |
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
|
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
Zu bestellen |
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
628 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Hessling, T. v. |
|
| |
Titel |
Die Perlmuschel und ihre Perlen |
Typ |
Buch |
| |
Jahr |
1859 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
372 |
|
| |
Schlüsselwörter |
Muschel, Margaritifera |
|
| |
Zusammenfassung |
|
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
Leipzig |
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
|
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
661 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Kaiser, M. S. |
|
| |
Titel |
Statistical models for limiting factors in ecology |
Typ |
Buch |
| |
Jahr |
1991 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
|
|
| |
Schlüsselwörter |
biological-production; energy-transfer; trophic-levels; aquatic-environment; statistical-analysis; limiting-factors; ecosystems-; ecology- |
|
| |
Zusammenfassung |
For several decades, aquatic ecologists have debated differing viewpoints on the factors that control ecosystem productivity. Much of the controversy centers on the interpretation of empirical relationships between factors that limit the amount of energy transferred among trophic levels in aquatic ecosystems. The primary statistical tool used has been regression analysis, but such models often fail to explain a substantial portion of the variability observed. The suggestion has been made in the literature of aquatic ecology that regression models may be inappropriate, and that limiting factors may be better related to the maximum rather than mean response. Statistical models that account for the large variability in relationships between limiting factors and response variables at higher trophic levels and shift the focus from description of expected values to description of upper boundaries have not been developed. The goal of this project was to develop statistical models for the relationships between limiting factors and the maximum output of biological processes. A number of models may be formulated, one of the primary being Y sub(i) – gamma x sub(i)U sub(i) + sigma epsilon sub(i), where gamma > 0, U sub(i) similar to iid Beta ( alpha , beta ), the x's are considered fixed values on the real line, and the error terms, epsilon sub(i), are centered iid random variables. This model describes a triangular array of points lying between zero and a straight line with positive slope, a data pattern seen numerous times in the ecological literature. The response variable Y is an identifiable mixture of the random variable U, with the model representing a situation in which Y is observed but U is unobserved. Maximum likelihood estimates for the parameters ( alpha , beta , gamma , sigma ) may be computed using the EM algorithm. Estimation is based on maximization of the expected full-data likelihood where the expectation is taken with respect to the conditional density of U given Y. A portion of the dissertation is devoted to the confirmation of asymptotic properties as the response variable, Y sub(i)'s, are not identically distributed. A set of conditions depending on the identically distributed error terms is given for consistency and asymptotic normality of MLE's. The model specific conditions are met by a number of error densities. (DBO) |
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
|
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
Zu bestellen |
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
772 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Konrad, M. |
|
| |
Titel |
Über den Einfluss von Verdohlungen in Fließgewässern auf das Wanderverhalten von Bachforellen (Salmo trutta m. fario L.) |
Typ |
Buch |
| |
Jahr |
1982 |
Publikation |
Fakultät für Biologie |
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
143 |
|
| |
Schlüsselwörter |
Fisch, Wanderung, Verbau, Bachforelle, Salmo trutta fario |
|
| |
Zusammenfassung |
|
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
Tübingen |
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
Literaturverzeichnis bearbeitet |
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
896 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Leshkevich, G. A. |
|
| |
Titel |
Great Lakes CoastWatch program update |
Typ |
Buch |
| |
Jahr |
1995 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
|
|
| |
Schlüsselwörter |
North-America,-Great-Lakes; monitoring-; decision-making; satellite-technology; coastal-waters; ecosystems-; data-transmission; environmental-monitoring; satellite-sensing |
|
| |
Zusammenfassung |
As the CoastWatch regional node for the Great Lakes, the Great Lakes Environmental Research Laboratory (GLERL) is working to obtain and/or develop and deliver environmental data and products for near real-time monitoring of the Great Lakes to support environmental science and decision making. In support of this goal, GLERL is providing access to near real-time and retrospective satellite observations and in-situ data for the Great Lakes to Federal, state, and local agencies and academic institutions. There are currently nearly 40 regional CoastWatch users. The goals and objectives of the Great Lakes CoastWatch Program directly support agency statutory responsibilities in estuarine and marine science, living marine resource protection, and ecosystem monitoring and management. GLERL is currently receiving an enhanced digital image product suite of 26 images including satellite derived surface-temperature, visible and near-infrared reflectance, brightness temperatures, satellite and solar zenith angle data, and cloud masks from the NOAA-12 satellite. These products are downloaded from the NOAA Ocean Products Center (OPC) via INTERNET on a daily basis and archived at GLERL. Over 32,000 image products have been received and archived since becoming the Great Lakes CoastWatch Node in 1990. GOES-8 data is also currently being received. |
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
|
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
Zu bestellen |
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
1005 |
|
| Permalink für diesen Eintrag |
| |
|
| |
|
Autor |
Möbius, K.; Heinke, F. |
|
| |
Titel |
Die Fische der Ostsee |
Typ |
Buch |
| |
Jahr |
1883 |
Publikation |
|
Kurztitel der Zeitschrift |
|
|
| |
Band |
|
Ausgabe |
|
Seiten |
|
|
| |
Schlüsselwörter |
Fisch, Ostsee, Vorkommen, Verbreitung |
|
| |
Zusammenfassung |
|
|
| |
Adresse |
|
|
| |
Organisation |
|
Abschlussarbeit |
|
|
| |
Herausgeber |
|
Erscheinungsort |
Kiel |
Editor |
|
|
| |
Sprache |
|
Sprache der Zusammenfassung |
|
Originaltitel |
|
|
| |
Editor der Reihe |
|
Titel der Reihe |
|
Kurztitel der Reihe |
|
|
| |
Band der Reihe |
|
Ausgabe der Reihe |
|
Edition |
0 |
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Bereich |
|
Expedition |
|
Konferenz |
|
|
| |
Notizen |
|
Geprüft |
|
|
| |
Rufnummer |
|
Signatur |
1117 |
|
| Permalink für diesen Eintrag |
