@article{TielboergerKadmonMuelleretal.2000, author = {Tielb{\"o}rger, Katja and Kadmon, Ronen and M{\"u}ller, Monika and Jeltsch, Florian}, title = {Populationsdynamische Funktionen von Ausbreitung und Dormanz}, year = {2000}, language = {de} } @article{JeltschWeberParueloetal.2000, author = {Jeltsch, Florian and Weber, Gisela and Paruelo, J. and Dean, W. R. J. and Milton, Sue J. and VanRooyen, N.}, title = {Beweidung als Degradationsfaktor in ariden und semiariden Weidesystemen}, year = {2000}, language = {de} } @article{ThulkeTischendorfStaubachetal.2000, author = {Thulke, Hans-Hermann and Tischendorf, L. and Staubach, C. and Selhorst, T. and Jeltsch, Florian and M{\"u}ller, T. and Schl{\"u}ter, H. and Wissel, Christian}, title = {The spatio-temporal dynamics of a post-vaccination recovery of rabies in foxes and emergency vaccination planning}, year = {2000}, language = {en} } @article{JeltschWeberGrimm2000, author = {Jeltsch, Florian and Weber, Gisela and Grimm, Volker}, title = {Ecological buffering mechanisms in savannas : a unifying theory of long-term tree-grass coexistence}, year = {2000}, language = {en} } @article{WiegandWardThulkeetal.2000, author = {Wiegand, K. and Ward, D. and Thulke, Hans-Hermann and Jeltsch, Florian}, title = {From snap-shot information to long-term population dynamics of Acacias by a simulation model}, year = {2000}, language = {en} } @article{WiegandJeltschWard2000, author = {Wiegand, K. and Jeltsch, Florian and Ward, D.}, title = {Do spatial effects play a role in the spatial distribution of desert dwelling Acacias?}, year = {2000}, language = {en} } @article{WiegandJeltsch2000, author = {Wiegand, T. and Jeltsch, Florian}, title = {Long-term dynamics in arid and semi-arid ecosystems : synthesis of a workshop}, year = {2000}, language = {en} } @article{WeberJeltsch2000, author = {Weber, Gisela and Jeltsch, Florian}, title = {Long-term impacts of livestock herbivory on herbaceous and woody vegetation in semiarid savannas}, year = {2000}, language = {en} } @article{JeltschStephanWiegandetal.2001, author = {Jeltsch, Florian and Stephan, T. and Wiegand, T. and Weber, G. E.}, title = {Arid rangeland management supported by dynamic spatially-explicit simulation models}, year = {2001}, language = {en} } @article{JeltschMoloney2001, author = {Jeltsch, Florian and Moloney, Kirk A.}, title = {Spatially-explicit vegetation models : what have we learned ?}, year = {2001}, language = {en} } @article{WichmannJeltschDeanetal.2002, author = {Wichmann, Matthias and Jeltsch, Florian and Dean, Richard and Moloney, Kirk A. and Wissel, Christian}, title = {Weather does matter : simulating population dynamics of tawny eagle (Aquila rapax) under various rainfall scenarios}, year = {2002}, language = {en} } @article{WichmannJeltschDeanetal.2002, author = {Wichmann, Matthias and Jeltsch, Florian and Dean, Richard and Moloney, Kirk A. and Wissel, Christian}, title = {Does climate change in arid savanna affect the population persistence of raptors?}, year = {2002}, language = {en} } @article{Jeltsch2002, author = {Jeltsch, Florian}, title = {Wechselbeziehungen zwischen Artendiversit{\"a}t und struktureller Diversit{\"a}t : modellgest{\"u}tzte Untersuchungen am Beispiel einer semiariden Savanne}, year = {2002}, language = {de} } @article{JeltschHansenTackmannetal.2003, author = {Jeltsch, Florian and Hansen, Frank and Tackmann, K. and Thulke, Hans-Hermann}, title = {K{\"o}derauslageintervalle und Dauer der Bek{\"a}mpfung des Kleinen Fuchsbandwurms : eine Modellierstudie}, year = {2003}, language = {de} } @article{JeltschWiegandHanskietal.2003, author = {Jeltsch, Florian and Wiegand, T. and Hanski, I. and Grimm, Volker}, title = {Using pattern-oriented modeling for revealing hidden information : a key for reconciling ecological theory and application}, year = {2003}, language = {en} } @article{JeltschWichmannDeanetal.2003, author = {Jeltsch, Florian and Wichmann, Matthias and Dean, W. R. J. and Moloney, Kirk A. and Wissel, Christian}, title = {Implications of climate change for the persistence of raptors in arid savannah}, year = {2003}, language = {en} } @article{JeltschWichmannJohstetal.2003, author = {Jeltsch, Florian and Wichmann, Matthias and Johst, J. and Moloney, Kirk A. and Wissel, Christian}, title = {Extinction risk in periodically fluctuating environments}, year = {2003}, language = {en} } @article{JeltschHansenThulke2003, author = {Jeltsch, Florian and Hansen, Frank and Thulke, Hans-Hermann}, title = {Simulationsmodelle zur Planung von Strategien in der Bek{\"a}mpfung von Wildtiererkrankungen}, year = {2003}, language = {de} } @article{JeltschHansenTackmannetal.2003, author = {Jeltsch, Florian and Hansen, Frank and Tackmann, K. and Wissel, Christian and Thulke, Hans-Hermann}, title = {Controlling Echinococcus multilocularis - ecological implications of field trials}, year = {2003}, language = {en} } @article{WiegandJeltschWard2004, author = {Wiegand, K. and Jeltsch, Florian and Ward, D.}, title = {Minimum recruitment frequency in plants with episodic recruitment}, year = {2004}, abstract = {There is concern about the lack of recruitment of Acacia trees in the Negev desert of Israel. We have developed three models to estimate the frequency of recruitment necessary for long-term population survival (i.e. positive average population growth for 1,000 years and <10\% probability of extinction). Two models assume purely episodic recruitment based on the general notion that recruitment in and environments is highly episodic. They differ in that the deterministic model investigates average dynamics while the stochastic model does not. Studies indicating that recruitment episodes in and environments have been overemphasized motivated the development of the third model. This semi-stochastic model simulates a mixture of continuous and episodic recruitment. Model analysis was done analytically for the deterministic model and via running model simulations for the stochastic and semi-stochastic models. The deterministic and stochastic models predict that, on average, 2.2 and 3.7 recruitment events per century, respectively, are necessary to sustain the population. According to the semi-stochastic model, 1.6 large recruitment events per century and an annual probability of 50\% that a small recruitment event occurs are needed. A consequence of purely episodic recruitment is that all recruitment episodes produce extremely large numbers of recruits (i.e. at odds with field observations), an evaluation that holds even when considering that rare events must be large. Thus, the semi- stochastic model appears to be the most realistic model. Comparing the prediction of the semi-stochastic model to field observations in the Negev desert shows that the absence of observations of extremely large recruitment events is no reason for concern. However, the almost complete absence of small recruitment events is a serious reason for concern. The lack of recruitment may be due to decreased densities of large mammalian herbivores and might be further exacerbated by possible changes in climate, both in terms of average precipitation and the temporal distribution of rain}, language = {en} }