scholarly journals Social Task Regulation in the Dimorphic Ant,Pheidole pallidula: the Influence of Caste Ratio

2010 ◽  
Vol 10 (3) ◽  
pp. 1-16 ◽  
Author(s):  
Grégory Sempo ◽  
Claire Detrain
Keyword(s):  
Pheidole Pallidula ◽  
Caste Ratio

Reproduction and caste ratios under stress in trematode colonies with a division of labour

Parasitology ◽  
2013 ◽  
Vol 140 (7) ◽  
pp. 825-832 ◽  
Author(s):  
MELANIE M. LLOYD ◽  
ROBERT POULIN
Keyword(s):  
Intermediate Host ◽  
Reproductive Output ◽  
Environmental Variability ◽  
Division Of Labour ◽  
Environmental Pressures ◽  
Caste Ratio ◽  
Infection Types ◽  
First Intermediate Host

SUMMARYTrematodes form clonal colonies in their first intermediate host. Individuals are, depending on species, rediae or sporocysts (which asexually reproduce) and cercariae (which develop within rediae or sporocysts and infect the next host). Some species use a division of labour within colonies, with 2 distinct redial morphs: small rediae (non-reproducing) and large rediae (individuals which produce cercariae). The theory of optimal caste ratio predicts that the ratio of caste members (small to large rediae) responds to environmental variability. This was tested in Philophthalmus sp. colonies exposed to host starvation and competition with the trematode, Maritrema novaezealandensis. Philophthalmus sp. infected snails, with and without M. novaezealandensis, were subjected to food treatments. Reproductive output, number of rediae, and the ratio of small to large rediae were compared among treatments. Philophthalmus sp. colonies responded to host starvation and competition; reproductive output was higher in well-fed snails of both infection types compared with snails in lower food treatments and well-fed, single infected snails compared with well-fed double infected snails. Furthermore, the caste ratio in Philophthalmus sp. colonies was altered in response to competition. This is the first study showing caste ratio responses to environmental pressures in trematodes with a division of labour.

scholarly journals Internest sex-ratio variation and male brood survival in the ant Pheidole pallidula

1996 ◽  
Vol 7 (3) ◽  
pp. 292-298 ◽  
Author(s):  
Laurent Keller ◽  
Serge Aron ◽  
Luc Passera
Keyword(s):  
Sex Ratio ◽  
Brood Survival ◽  
Ratio Variation ◽  
Male Brood ◽  
Pheidole Pallidula

Chemical Intra-Mediterranean Variation and Insecticidal Activity of Crithmum maritimum

2001 ◽  
Vol 56 (3-4) ◽  
pp. 211-215 ◽  
Author(s):  
Maria Tsoukatou ◽  
Christina Tsitsimpikou ◽  
Constantinos Vagias ◽  
Vassilios Roussis
Keyword(s):  
Chemical Composition ◽  
Essential Oils ◽  
Methyl Ether ◽  
Insecticidal Activity ◽  
Significant Activity ◽  
Italian Chemical ◽  
Volatile Metabolites ◽  
Pheidole Pallidula ◽  
Chemical Profiles ◽  
The Mediterranean

AbstractThe chemical composition of the volatile metabolites of Crithmum maritimum harvested from several geographic localities along the Mediterranean coasts was studied by GC and GC-MSD. The major oil constituents were found to be dillapiole, γ-terpinene, sabinene, limo-nene and β-phellandrene. The Western populations were richer in dillapiole, whereas the Southern collections were characterized by increased amounts of thymol methyl ether and y-terpinene. The Italian chemical profiles differentiated by the significant contributions of carvacrol methyl ether and isoterpinolene. The essential oils were also investigated for their insecticidal activity and their repellency against Pheidole pallidula (Nylander) ants and found to possess significant activity.

scholarly journals COLONY SEX RATIOS IN THE FACULTATIVELY POLYGYNOUS ANT PHEIDOLE PALLIDULA: A REANALYSIS WITH NEW DATA

Evolution ◽  
2004 ◽  
Vol 58 (5) ◽  
pp. 1141 ◽  
Author(s):  
Ken R. Helms ◽  
Denis Fournier ◽  
Laurent Keller ◽  
Luc Passera ◽  
Serge Aron
Keyword(s):  
Sex Ratios ◽  
Pheidole Pallidula

scholarly journals Dynamics of Collective Exploration in the Ant Pheidole Pallidula

1991 ◽  
Vol 98 (1) ◽  
pp. 21-31 ◽  
Author(s):  
C. Detrain ◽  
J. L. Deneubourg ◽  
S. Goss ◽  
Y. Quinet
Keyword(s):  
Pheidole Pallidula

scholarly journals Artificial selection on ant female caste ratio uncovers a link between female-biased sex ratios and infection by Wolbachia endosymbionts

2016 ◽  
Vol 30 (2) ◽  
pp. 225-234 ◽  
Author(s):  
L. Pontieri ◽  
A. M. Schmidt ◽  
R. Singh ◽  
J. S. Pedersen ◽  
T. A. Linksvayer
Keyword(s):  
Artificial Selection ◽  
Sex Ratios ◽  
Caste Ratio
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