1,721,160 research outputs found
Reliability of yellow bodies as indexes of egg laying activity in the primitively eusocial wasp Polistes dominula
Full text linkUnderstanding the evolution of asymmetric access to reproduction requires reliable tools to measure individual reproductive share. In social insects, reproductive skew is usually evaluated by measuring the degree of ovarian development. However, this approach has been recently shown to reliably estimate only the physiological investment in reproduction, while it is rather inconsistent regarding the individual egg laying rate. Here, I assess the reliability of other physiological traits, the presence and size of yellow bodies, i.e. the remains of nurse cells deposited at the base of the ovarioles whenever an egg is laid. Their usefulness in indicating previous egg laying activity has been recognized since decades, but a formal assessment of their reliability has never been performed. By combining behavioural observations and physiological measurements in the social wasp Polistes dominula I determined whether yellow bodies presence and size reliably track previous reproductive activity. Despite the presence of yellow bodies is associated with egg laying, the classification of individuals to egg layer/non egg layer categories is not completely reliable, inducing in a relevant rate of false positive and false negatives. Moreover, size of yellow bodies is poorly correlated with egg laying and does not allow to properly infer the relative reproductive activity. Overall, yellow bodies do not precisely track small differences in egg laying and their use is thus recommended only when moderate to big differences are expected. Prudence is especially suggested in primitively eusocial species, where the short reproductive period and the distributed totipotency may result in small differences in individual reproduction
A PIEDI O IN VOLO? INFLUENZA DI GEOGRAFIA ATTUALE E PALEOGEOGRAFIA SULLA DIVERSITÀ DELLE FARFALLE DELL’ARCIPELAGO TOSCANO
No full textA Socio‐Spatial Combined Approach Confirms a Highly Compartmentalised Structure in Honeybees
No full textFiniture di colore dei capitelli: alcuni dati preliminari
No full textLo studio materico delle finiture pittoriche di alcuni capitelli (sia localizzati
all’interno di alcune sale, sia appartenenti all’apparto decorativo del chiostro) è stato condotto nell’ottica della minima invasività. I icroprelievi,
per l’esiguità delle loro dimensioni, hanno richiesto un approccio analitico fondato sull’utilizzo della microscopia ottica ed elettronica a scansione, abbinate alle microanalisi. In questa fase, ancora preliminare, l’attenzione è stata focalizzata principalmente sulla lettura delle microstratigrafie
(successione degli strati e interpretazione delle eventuali lacune)
come chiave di lettura della sequenza degli interventi di finitura pittorica e
delle tecniche utilizzate
Inferring reproductive activity through the ovarian development assessment:comparison of different methods.
No full textIncreased fertility and prompt fecudity in paper wasp workers usurped by a social parasite
No full textLl’indice ovarico come indicatore di fertilità e ovodeposizione nella vespa sociale Polistes dominulus.
No full textBehavioural-responce threshold to conspecific cuticular lipids and chemical insignificance hypothesis in Polistes social parasites.
No full textIL COMPORTAMENTO DI OVOPOSIZIONE NELLA VESPA SOCIALE POLISTES DOMINULUS: PRELIMINARI INDIZI DI UN COMPORTAMENTO RITMICO
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