THE OLDEST ANTS ARE CRETACEOUS, NOT EOCENE: REPLY

Our study of the Hat Creek amber (Poinar et al. 1999) was undertaken to determine the range of the biota in the resin, to identify the plant that produced the resin, and to assess the future implications of these significant deposits. The study was in no way "compromised” by providing an alternative interpretation of the systematic position of the genus Sphecomyrma Wilson and Brow

fuzzySim: applying fuzzy logic to binary similarity indices in ecology

Binary similarity indices are widely used in ecology, for example for detecting associations between species occurrence patterns, comparing regional and temporal species assemblages, and assessing beta diversity patterns, including spatial and temporal species loss and turnover. Such indices have widespread applications in biogeography, global change biology and biodiversity conservation. Similarity indices are commonly calculated upon binary presence/absence (or sometimes modelled suitable/unsuitable) data, which are generally incomplete and more categorical than their underlying natural patterns. Probable false absences are disregarded, amplifying the effects of data deficiencies and the scale dependence of the results. Fuzzy occurrence data, with a degree of uncertainty attributed to localities where presence or absence cannot be safely assigned, could better reflect species distributions, compensating for incomplete knowledge and methodological errors. Similarity indices would therefore also benefit from accommodating such fuzzy data directly. This study proposes fuzzy versions of the binary similarity indices most commonly used in ecology, so that they can be directly applied to continuous (fuzzy) rather than binary occurrence values, thus producing more realistic similarity assessments. Fuzzy occurrence can be obtained with several methods, some of which are also provided. The procedure is robust to data source disparities, gaps or other errors in species occurrence records, even for restricted species for which slight inaccuracies can affect substantial parts of their range. The method is implemented in a free and open-source software package, fuzzySim, which is available for the R statistical software and under implementation for the QGIS geographic information system. It is provided with sample data and an illustrated tutorial suitable for non-experienced users

Colony size predicts division of labour in Attine ants

Division of labour is central to the ecological success of eusocial insects, yet the evolutionary factors driving increases in complexity in division of labour are little known. The size–complexity hypothesis proposes that, as larger colonies evolve, both non-reproductive and reproductive division of labour become more complex as workers and queens act to maximize inclusive fitness. Using a statistically robust phylogenetic comparative analysis of social and environmental traits of species within the ant tribe Attini, we show that colony size is positively related to both non-reproductive (worker size variation) and reproductive (queen–worker dimorphism) division of labour. The results also suggested that colony size acts on non-reproductive and reproductive division of labour in different ways. Environmental factors, including measures of variation in temperature and precipitation, had no significant effects on any division of labour measure or colony size. Overall, these results support the size–complexity hypothesis for the evolution of social complexity and division of labour in eusocial insects. Determining the evolutionary drivers of colony size may help contribute to our understanding of the evolution of social complexity

Colony size predicts division of labour in Attine ants

Division of labour is central to the ecological success of eusocial insects, yet the evolutionary factors driving increases in complexity in division of labour are little known. The size–complexity hypothesis proposes that, as larger colonies evolve, both non-reproductive and reproductive division of labour become more complex as workers and queens act to maximize inclusive fitness. Using a statistically robust phylogenetic comparative analysis of social and environmental traits of species within the ant tribe Attini, we show that colony size is positively related to both non-reproductive (worker size variation) and reproductive (queen–worker dimorphism) division of labour. The results also suggested that colony size acts on non-reproductive and reproductive division of labour in different ways. Environmental factors, including measures of variation in temperature and precipitation, had no significant effects on any division of labour measure or colony size. Overall, these results support the size–complexity hypothesis for the evolution of social complexity and division of labour in eusocial insects. Determining the evolutionary drivers of colony size may help contribute to our understanding of the evolution of social complexity

Mapping of Urinary Volatile Organic Compounds by a Rapid Analytical Method Using Gas Chromatography Coupled to Ion Mobility Spectrometry (GC–IMS)

Volatile organic compounds (VOCs) are a differentiated class of molecules, continuously generated in the human body and released as products of metabolic pathways. Their concentrations vary depending on pathophysiological conditions. They are detectable in a wide variety of biological samples, such as exhaled breath, faeces, and urine. In particular, urine represents an easily accessible specimen widely used in clinics. The most used techniques for VOCs detections are expensive and time-consuming, thus not allowing for rapid clinical analysis. In this perspective, the aim of this study is a comprehensive characterisation of the urine volatilome by the development of an alternative rapid analytical method. Briefly, 115 urine samples are collected; sample treatment is not needed. VOCs are detected in the urine headspace using gas chromatography coupled to ion mobility spectrometry (GC-IMS) by an extremely fast analysis (10 min). The method is analytically validated; the analysis is sensitive and robust with results comparable to those reported with other techniques. Twenty-three molecules are identified, including ketones, aldehydes, alcohols, and sulphur compounds, whose concentration is altered in several pathological states such as cancer and metabolic disorders. Therefore, it opens new perspectives for fast diagnosis and screening, showing great potential for clinical applications

Mammalian biogeography and the Ebola virus in Africa

Ebola virus is responsible for the fatal Ebola-virus disease (EVD). Links between EVD outbreaks in Africa and 3 chiropteran species, presumed to be reservoirs for the Ebola virus, have been suggested, but discussions are still on-going. There is also evidence of significant virus spillover among mammal species not suspected to be natural hosts (e.g. chimpanzees, gorillas and duikers). We mapped the potential distribution of the Ebola virus in Africa based on both environmental and zoogeographic descriptors. We employed distribution modelling using the Favourability Function, alongside a complement of biogeographic approaches including chorotype analysis. We obtained a significantly well-calibrated model defining the distribution of environmentally favourable areas for the presence of Ebola virus, which was outperformed by a model determining favourable areas according to mammalian biogeography. Finally, we built a model in which the combined landscape and mammalian distribution types better explained the distribution of Ebola virus independent of human-to-human transmissions. Our findings show that the core area for the virus is associated with infections of known animal origin, but surrounded by areas where human infections of unknown source were found. This difference in the association between human and animals and the virus may offer further insights to better understand how EVD can spread, as well as providing the basis for an early warning system based on where human contact with multiple animal species may occur. We propose a biogeographically-justified list of at least 64 mammal species whose link with Ebola virus is worth investigating

New records of ant species from Yunnan, China

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Calprotectin in nasal secretion: a new biomarker of non-type 2 inflammation in CRSwNP

We analysed calprotectin in sinonasal secretions of different chronic rhinosinusitis with nasal polyps (CRSwNP) endotypes to assess its role as a biomarker of non-type 2 inflammation.We included primary diffuse CRSwNP patients (n = 41) and three different control groups [non-allergic rhinitis (NAR) (n = 13), non-allergic eosinophilic syndrome (NARES) (n = 10) and healthy subjects (n = 12)]. Calprotectin levels were detected in nasal secretions using a chemiluminescent immunoassay (CLIA).Calprotectin levels in nasal secretions were significantly higher in all non-type 2 endotypes of CRSwNP compared to healthy controls (p0.05). In contrast, in type-2 CRSwNP calprotectin was significantly lower compared to controls (p0.05). A significant correlation between calprotectin levels and neutrophilic count/HPF was found in CRSwNP (p0.01). Clinically, mean levels of calprotectin and neutrophilia were significantly higher in patients who previously underwent 3 or more endoscopic sinus surgeries (p0.05).Calprotectin in nasal secretions may be a biomarker of non-type 2 inflammation. Low levels of calprotectin are indicative of a type-2 immune response in both CRSwNP and non-allergic rhinitis. We observed that calprotectin levels significantly increased based on the number of previous surgeries.Calprotectina nel secreto nasale: nuovo biomarker di infiammazione non-tipo 2 nella poliposi nasale.Abbiamo analizzato i livelli di calprotectina nelle secrezioni nasali di diversi endotipi di CRSwNP, per valutarne il ruolo di marcatore di infiammazione non-tipo 2.Abbiamo incluso pazienti con CRSwNP diffusa primaria (n = 41) e tre diversi gruppi di controllo [rinite non allergica (NAR) (n = 13), rinite eosinofila non allergica (NARES) (n = 10) e soggetti sani (n = 12)]. I livelli di calprotectina sono stati dosati mediante test di chemoluminescenza.I livelli di calprotectina sono risultati significativamente più alti in tutti gli endotipi non-tipo 2 di CRSwNP, rispetto ai controlli sani (p0,05). Al contrario, nella CRSwNP tipo 2 essa è risultata inferiore rispetto ai controlli (p0,05). È stata riscontrata una correlazione significativa tra i livelli di calprotectina e la conta dei neutrofili/HPF (p0.01). I livelli medi di calprotectina aumentano inoltre nei pazienti in precedenza sottoposti a 3 o più ESS (p0,05).La calprotectina nelle secrezioni nasali può essere considerata un biomarcatore di infiammazione non-tipo 2 mentre bassi livelli di calprotectina sono indicativi di immunoflogosi di tipo 2. Abbiamo infine osservato che i livelli di calprotectina aumentano significativamente in relazione al numero di interventi chirurgici pregressi

A Descriptive Morphology of the Ant Genus Procryptocerus (Hymenoptera: Formicidae)

Morphology is the most direct approach biologists have to recognize uniqueness of insect species as compared to close relatives. Ants of the genus Procryptocerus possess important morphologic characters yet have not been explored for use in a taxonomic revision. The genus is characterized by the protrusion of the clypeus forming a broad nasus and antennal scrobes over the eyes. The toruli are located right posterior to the flanks of the nasus opposite to each other. The vertex is deflexed posteriorly in most species. An in-group comparison of the external morphology is presented focusing on the workers. A general morphology for gynes and males is also presented. Previously mentioned characters as well as new ones are presented, and their character states in different species are clarified. For the metasoma a new system of ant metasomal somite nomenclature is presented that is applicable to Aculeata in general. Finally, a Glossary of morphological terms is offered for the genus (available online). Most of the terminology can be used in other members of the Formicidae and Aculeata