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1

Artenvielfalt und Evolution

Dr. Helmut Zwölfer, Wolfgang Völkl

Journal:

Biologie in unserer Zeit

Year:

1993

Language:

german

File:

PDF, 1.15 MB

german, 1993

2

[Ecological Studies] Potentials and Limitations of Ecosystem Analysis Volume 61 || Plant Architecture and Resource Competition

Schulze, Ernst-Detlef, Zwölfer, Helmut

Year:

1987

Language:

english

File:

PDF, 3.53 MB

english, 1987

3

Personalien

Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1960

Language:

german

File:

PDF, 282 KB

german, 1960

4

The Predator Complex of the White-Fir Woolly Aphids (Genus Dreyfusia, Adelgidae)

Hubert Pschorn-Walcher, Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1956

Language:

english

File:

PDF, 724 KB

english, 1956

5

[Ecological Studies] Potentials and Limitations of Ecosystem Analysis Volume 61 || Characteristics of Lotic Ecosystems and Consequences for Future Research Directions

Schulze, Ernst-Detlef, Zwölfer, Helmut

Year:

1987

Language:

english

File:

PDF, 4.51 MB

english, 1987

6

[Ecological Studies] Potentials and Limitations of Ecosystem Analysis Volume 61 || On Methods of Analyzing Ecosystems: Lessons from the Analysis of Forest-Insect Systems

Schulze, Ernst-Detlef, Zwölfer, Helmut

Year:

1987

Language:

english

File:

PDF, 3.41 MB

english, 1987

7

Das biologische Modell: Prinzipien des Energieflusses in Ökologischen Systemen

Zwölfer, Helmut

Journal:

Year:

1991

Language:

german

File:

PDF, 432 KB

german, 1991

8

Untersuchungen zur biologischen Bekämpfung einiger Unkräuter und Schädlinge in Landwirtschaft und Obstbau

Klaus Carl, Helmut Zwölfer

Journal:

Journal of Pest Science

Year:

1965

Language:

german

File:

PDF, 1.04 MB

german, 1965

9

The problem of optimal clutch size in a tritrophic system: the oviposition strategy of the thistle gallflyUrophora cardui(Diptera, Tephritidae)

Gunter Freese, Helmut Zwölfer

Journal:

Year:

1996

Language:

english

File:

PDF, 1.11 MB

english, 1996

10

Jax K: Die Einheiten der Ökologie—Analyse, Methodenentwicklung und Anwendung in Ökologie und Naturschutz: (The units of ecology—an analysis, the development of methods and their use in ecology and nature conservation) Theorie in der Ökologie 5, Peter Lang, Frankfurt, 2002, 249 pages, 14 figures, 3 tables, € 40.40, ISBN 3-631-38954-X

Helmut Zwölfer

Journal:

Basic and Applied Ecology

Year:

2004

Language:

english

File:

PDF, 125 KB

english, 2004

11

The Problem of Optimal Clutch Size in a Tritrophic System: The Oviposition Strategy of the Thistle Gallfly Urophora cardui (Diptera, Tephritidae)

Gunter Freese and Helmut Zwölfer

Journal:

Year:

1996

Language:

english

File:

PDF, 1.52 MB

english, 1996

12

Plant quality or quantity? Host exploitation strategies in three Chrysomelidae species associated with Asteraceae host plants

Elisabeth Obermaier, Helmut Zwölfer

Journal:

Entomologia Experimentalis et Applicata

Year:

1999

Language:

english

File:

PDF, 167 KB

english, 1999

13

Plant diversity has contrasting effects on herbivore and parasitoid abundance in Centaurea jacea flower heads

Nitschke, Norma, Allan, Eric, Zwölfer, Helmut, Wagner, Lysett, Creutzburg, Sylvia, Baur, Hannes, Schmidt, Stefan, Weisser, Wolfgang W.

Journal:

Ecology and Evolution

Year:

2017

Language:

english

File:

PDF, 1.13 MB

english, 2017

14

Evolution, Public Goods, and the State || Extinctions in the History of Lifeby Paul D. Taylor

Review by: Helmut Zwölfer

Journal:

Politics and the Life Sciences

Year:

2007

Language:

english

File:

PDF, 471 KB

english, 2007

15

Zur Systematik, Biologie und ökologie unterirdisch lebender Aphiden (Homoptera, Aphidoidea)(Anoeciinae, Tetraneurini, Pemphigini und Fordinae) : Teil II Tetraneurini und Pemphigini

Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1957

Language:

german

File:

PDF, 2.90 MB

german, 1957

16

Eurytoma serratulae and E. robusta (Hymenoptera, Eurytomidae): complementary host exploitation strategies of coexisting parasitoids and their impact on the host Urophora cardui

Zwölfer, Helmut, Böheim, Marc, Beck, Erwin

Journal:

Journal of Hymenoptera Research

Year:

2015

Language:

english

File:

PDF, 1.10 MB

english, 2015

17

Zur Systematik, Biologie und Ökologie unterirdisch lebender Aphiden (Homoptera, Aphidoidea) (Anoeciinae, Tetraneurini, Pemphigini und Fordinae) : Teil IV (Ökologische und systematische Erörterungen)

Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1958

Language:

german

File:

PDF, 3.52 MB

german, 1958

18

Innerartliche Kommunikations-systeme bei Bohrfliegen

Helmut Zwölfer

Journal:

Biologie in unserer Zeit

Year:

1974

Language:

german

File:

PDF, 1.41 MB

german, 1974

19

Konkurrenzerscheinugen in Parasitenkomplexen als Problem der Biologischen Schädlinfbekämpfung

Hubert Pschorn-Walcher, Helmut Zwölfer

Journal:

Journal of Pest Science

Year:

1968

File:

PDF, 816 KB

1968

20

Zur Systematik, Biologie und Ökologie unterirdisch lebender Aphiden (Homoptera, Aphidoidea) (Anoeciinae, Tetraneurini, Pemphigini und Fordinae): Teil III (Fordinae)

Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1958

Language:

german

File:

PDF, 2.59 MB

german, 1958

21

Enoximone versus epinephrine/nitroglycerin in cardiac low-output states following valve replacement

Werner Zwölfer, Paul Keznickl, Helmut T. Dressler, Hans A. Dieterich

Journal:

Clinical Cardiology

Year:

1995

Language:

english

File:

PDF, 471 KB

english, 1995

22

Book Review

Zwölfer, Helmut

Journal:

Politics and the Life Sciences

Year:

2007

Language:

english

File:

PDF, 127 KB

english, 2007

23

Zur Kenntnis der Parasiten des Tannentriebwicklers : Choristoneura (Cacoecia) murinana HB. Teil I

Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1956

Language:

german

File:

PDF, 1.38 MB

german, 1956

24

[Ecological Studies] Potentials and Limitations of Ecosystem Analysis Volume 61 || Predictability in Lake Ecosystems: the Role of Biotic Interactions

Schulze, Ernst-Detlef, Zwölfer, Helmut

Year:

1987

Language:

english

File:

PDF, 3.15 MB

english, 1987

25

Zur Systematik, Biologie und ökologie unterirdisch lebender Aphiden (Homoptera, Aphidoidea) : (Anoeciinae, Tetraneurini, Pemphigini und Fordinae): Teil I (Anoeciinae)

Helmut Zwölfer

Journal:

Journal of Applied Entomology

Year:

1957

Language:

german

File:

PDF, 2.45 MB

german, 1957

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