The role of adult feeding in egg production and population dynamics of the checkerspot butterfly Euphydryas editha

Oecologia ◽  
1983 ◽  
Vol 56 (2-3) ◽  
pp. 257-263 ◽  
Author(s):  
Dennis D. Murphy ◽  
Alan E. Launer ◽  
Paul R. Ehrlich
Keyword(s):  
Population Dynamics ◽  
Egg Production ◽  
Euphydryas Editha ◽  
Adult Feeding

scholarly journals Do males matter? The role of males in population dynamics

Oikos ◽  
2007 ◽  
Vol 116 (2) ◽  
pp. 335-348 ◽  
Author(s):  
Daniel J. Rankin ◽  
Hanna Kokko
Keyword(s):  
Population Dynamics

The population dynamics of metacercariae of Apatemon gracilis (Trematoda: Digenea) in three species of lake-dwelling leeches

Parasitology ◽  
1986 ◽  
Vol 93 (3) ◽  
pp. 517-530 ◽  
Author(s):  
S. M. Spelling ◽  
J. O. Young
Keyword(s):  
Population Dynamics ◽  
Relative Density ◽  
Sexual Maturity ◽  
Egg Production ◽  
Seasonal Pattern ◽  
Distinct Pattern ◽  
The Other ◽  
Mean Intensity ◽  
Density Values ◽  
Host Mortality

SUMMARYMonthly samples of the leeches Erpobdella octoculata, Glossiphonia complanata and Helobdella stagnalis were taken over a two-year period from an eutrophic, English lake to detect metacercariae of the trematode, Apatemon gracilis. In each cohort of each of the three leeches, prevalence was low in young individuals, rose to a peak in autumn/winter, and then declined until the cohort had almost died out; in E. octoculata and H. stagnalis a final brief increase occurred. Mean intensity and relative density values followed a similar seasonal pattern of change to that of prevalence in these last two species, but in G. complanata values fluctuated irregularly with no distinct pattern. The frequency distribution of the parasite in G. complanata was highly over-dispersed, but less so in the other two species. Infected E. octoculata reached sexual maturity. The parasite reduced egg production in G. complanata and H. stagnalis, but only by maximum values of 2·5 and 9% respectively. This reduction in fecundity is low compared to the subsequent high mortality, at 95% or more, of newly recruited young from as yet unidentified causes. Parasite-related host mortality was difficult to assess in young leeches, but there was some evidence for its occurrence in older leeches of E. octoculata and H. stagnalis. However, this is unlikely to play a prominent role in the control and regulation of lacustrine leech populations.

The Role of Organic Matter in the Population Dynamics of the Endoparasitic Nematophagous Fungus Drechmeria Coniospora in Microcosms

Nematologica ◽  
1994 ◽  
Vol 40 (1-4) ◽  
pp. 249-257 ◽  
Author(s):  
L.A. Bouwman ◽  
C.H. Ettema ◽  
P.H.J.F. Van Den Boogert ◽  
H. Velvis
Keyword(s):  
Population Dynamics ◽  
Organic Matter ◽  
Nematophagous Fungus
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