scholarly journals Fecundity determines the outcome of founding queen associations in ants

2020 ◽  
Author(s):  
Eva-Maria Teggers ◽  
Falk Deegener ◽  
Romain Libbrecht
Keyword(s):  
Colony Growth ◽  
Typical Case ◽  
Lasius Niger ◽  
Offspring Production ◽  
Queen Associations

AbstractAnimal cooperation evolved because of its benefits to the cooperators. Pleometrosis in ants - the cooperation of queens to found a colony - benefits colony growth, but also incurs costs for some of the cooperators because only one queen usually survives the association. While several traits are associated with queen survival, they tend to be confounded and it is unclear which factor specifically determines the outcome of pleometrosis. In this study, we used the ant Lasius niger to monitor offspring production in colonies founded by one or two queens. Then, we experimentally paired queens that differed in fecundity but not in size, and vice versa, to disentangle the effect of these factors on queen survival. Finally, we investigated how fecundity and size differed between queens depending on whether they were chosen as pleometrotic partners. Our results indicate that pleometrosis increased and accelerated worker production via a nutritional boost to the larvae. The most fecund queens more frequently survived the associations, even when controlling for size and worker parentage, and queens selected as pleometrotic partners were less fecund. Our results are consistent with fecundity being central to the onset and outcome of pleometrosis, a typical case of cooperation among unrelated animals.

scholarly journals Fecundity determines the outcome of founding queen associations in ants

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Eva-Maria Teggers ◽  
Falk Deegener ◽  
Romain Libbrecht
Keyword(s):  
Colony Growth ◽  
Lasius Niger ◽  
Offspring Production ◽  
Queen Associations

AbstractAnimal cooperation evolved because of its benefits to the cooperators. Pleometrosis in ants—the cooperation of queens to found a colony—benefits colony growth, but also incurs costs for some of the cooperators because only one queen usually survives the association. While several traits in queens influence queen survival, they tend to be confounded and it is unclear which factor specifically determines the outcome of pleometrosis. In this study, we used the ant Lasius niger to monitor offspring production in colonies founded by one or two queens. Then, we experimentally paired queens that differed in fecundity but not in size, and vice versa, to disentangle the effect of these factors on queen survival. Finally, we investigated how fecundity and size differed between queens depending on whether they were chosen as pleometrotic partners. Our results indicate that pleometrosis increased and accelerated worker production via a nutritional boost to the larvae. The most fecund queens more frequently survived the associations, even when controlling for size and worker parentage, and queens selected as pleometrotic partners were less fecund. Our results are consistent with fecundity being central to the onset and outcome of pleometrosis, a classic example of cooperation among unrelated animals.

Tolerating an infection: an indirect benefit of co-founding queen associations in the ant Lasius niger

2013 ◽  
Vol 100 (12) ◽  
pp. 1125-1136 ◽  
Author(s):  
Christopher D. Pull ◽  
William O. H. Hughes ◽  
Mark J. F. Brown
Keyword(s):  
Lasius Niger ◽  
Indirect Benefit ◽  
Queen Associations

Analysis of 2D and 3D defects associated with precipitation of Cu in silicon

1991 ◽  
Vol 49 ◽  
pp. 870-871
Author(s):  
P.M. Rice ◽  
MJ. Kim ◽  
R.W. Carpenter
Keyword(s):  
Colony Growth ◽  
Dark Field ◽  
Dark Side ◽  
Silicide Phase ◽  
Strain Fields ◽  
Near Surface ◽  
Unknown Composition ◽  
Secondary Precipitates ◽  
20 Nm ◽  
2D And 3D

Extrinsic gettering of Cu on near-surface dislocations in Si has been the topic of recent investigation. It was shown that the Cu precipitated hetergeneously on dislocations as Cu silicide along with voids, and also with a secondary planar precipitate of unknown composition. Here we report the results of investigations of the sense of the strain fields about the large (~100 nm) silicide precipitates, and further analysis of the small (~10-20 nm) planar precipitates.Numerous dark field images were analyzed in accordance with Ashby and Brown's criteria for determining the sense of the strain fields about precipitates. While the situation is complicated by the presence of dislocations and secondary precipitates, micrographs like those shown in Fig. 1(a) and 1(b) tend to show anomalously wide strain fields with the dark side on the side of negative g, indicating the strain fields about the silicide precipitates are vacancy in nature. This is in conflict with information reported on the η'' phase (the Cu silicide phase presumed to precipitate within the bulk) whose interstitial strain field is considered responsible for the interstitial Si atoms which cause the bounding dislocation to expand during star colony growth.

Ramsay Hunt syndrome

2012 ◽  
Vol 153 (32) ◽  
pp. 1281-1283
Author(s):  
Róbert Kui ◽  
Zsuzsanna Bata-Csörgő ◽  
Margit Zeher ◽  
Lajos Kemény
Keyword(s):  
Herpes Zoster ◽  
Multidisciplinary Approach ◽  
Systemic Corticosteroid ◽  
Complete Recovery ◽  
Typical Case ◽  
Early Administration ◽  
Ramsay Hunt Syndrome ◽  
Peripheral Facial Palsy ◽  
Hunt Syndrome ◽  
Systemic Corticosteroid Therapy

Ramsay Hunt syndrome is a special form of herpes zoster which is typically characterized by peripheral facial palsy and unilateral herpetic vesicles on the ear. These symptoms are often accompanied by vestibulocochlear dysfunction and other neurological and ophthalmological symptoms. The diagnosis and therapy requires a multidisciplinary approach. The authors present a typical case where the early administration of combined antiviral and systemic corticosteroid therapy led to complete recovery. The authors emphasize the importance of early diagnosis and adequate combination therapy, which improves the prognosis of this disease. Orv. Hetil., 2012, 153, 1281–1283.

First Fluorescent Acetylspermidine Deacetylation Assay for HDAC10 Identifies Inhibitors of Neuroblastoma Cell Colony Growth That Increase Lysosome Accumulation

2020 ◽  
Author(s):  
Daniel Herp ◽  
Johannes Ridinger ◽  
Dina Robaa ◽  
Stephen A. Shinsky ◽  
Karin Schmidtkunz ◽  
...  
Keyword(s):  
Histone Deacetylases ◽  
High Throughput Screening ◽  
Neuroblastoma Cell ◽  
Hdac Inhibitors ◽  
Anticancer Therapy ◽  
Colony Growth ◽  
Autophagic Flux ◽  
Enzymatic Conversion ◽  
Lysine Deacetylase

Histone deacetylases (HDACs) are important epigenetic regulators involved in many diseases, esp. cancer. First HDAC inhibitors have been approved for anticancer therapy and many are in clinical trials. Among the 11 zinc-dependent HDACs, HDAC10 has received relatively little attention by drug discovery campaigns, despite its involvement e.g. in the pathogenesis of neuroblastoma. This is due in part to a lack of robust enzymatic conversion assays. In contrast to the protein lysine deacetylase and deacylase activity of the other HDAC subtypes, it has recently been shown that HDAC10 has strong preferences for deacetylation of oligoamine substrates like spermine or spermidine. Hence, it also termed a polyamine deacetylase (PDAC). Here, we present the first fluorescent enzymatic conversion assay for HDAC10 using an aminocoumarin labelled acetyl spermidine derivative to measure its PDAC activity, which is suitable for high-throughput screening. Using this assay, we identified potent inhibitors of HDAC10 mediated spermidine deacetylation in-vitro. Among those are potent inhibitors of neuroblastoma colony growth in culture that show accumulation of lysosomes, implicating disturbance of autophagic flux.

Offspring Production Among the Relatives of Istmo Zapotec Men and Muxes

2020 ◽  
Vol 49 (2) ◽  
pp. 581-594 ◽  
Author(s):  
Francisco R. Gómez Jiménez ◽  
Scott W. Semenyna ◽  
Paul L. Vasey
Keyword(s):  
Offspring Production
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