A small loon and a new species of large owl from the Rupelian of Belgium (Aves: Gaviiformes, Strigiformes)

Abstract The early Oligocene Boom Formation in Belgium yielded many avian remains from the Rupelian unitstratotype, most of which have remained unstudied so far. Here, I describe a small loon (Gaviiformes) and a new species of large owl (Strigiformes) that are represented by associated bones of a single individual each. The loon, of which wing and pectoral girdle bones are preserved, is assigned to Colymboides (?) metzleri, a species previously known from a partial skeleton from the Rupelian of Germany. The owl is based on a tarsometatarsus and distal tibiotarsus and described as a new species, Selenornis steendorpensis. It constitutes the most substantial fossil record of the taxon Selenornis, which was before known from a distal tibiotarsus from an unknown horizon of the Quercy fissure fillings in southwestern France. It is detailed that there are differences in the higher level taxonomic composition of the known early Oligocene avifaunas of northern and southern Europe, which may reflect true zoogeographic facts owing to a different climate and vegetation. Keywords Fossil birds Á Rupelian Á North Sea basin Á Colymboides (?) metzleri Á Selenornis steendorpensis n. sp

Waves of genomic hitchhikers shed light on the evolution of gamebirds (Aves: Galliformes) : research article

Background The phylogenetic tree of Galliformes (gamebirds, including megapodes, currassows, guinea fowl, New and Old World quails, chicken, pheasants, grouse, and turkeys) has been considerably remodeled over the last decades as new data and analytical methods became available. Analyzing presence/absence patterns of retroposed elements avoids the problems of homoplastic characters inherent in other methodologies. In gamebirds, chicken repeats 1 (CR1) are the most prevalent retroposed elements, but little is known about the activity of their various subtypes over time. Ascertaining the fixation patterns of CR1 elements would help unravel the phylogeny of gamebirds and other poorly resolved avian clades. Results We analyzed 1,978 nested CR1 elements and developed a multidimensional approach taking advantage of their transposition in transposition character (TinT) to characterize the fixation patterns of all 22 known chicken CR1 subtypes. The presence/absence patterns of those elements that were active at different periods of gamebird evolution provided evidence for a clade (Cracidae + (Numididae + (Odontophoridae + Phasianidae))) not including Megapodiidae; and for Rollulus as the sister taxon of the other analyzed Phasianidae. Genomic trace sequences of the turkey genome further demonstrated that the endangered African Congo Peafowl (Afropavo congensis) is the sister taxon of the Asian Peafowl (Pavo), rejecting other predominantly morphology-based groupings, and that phasianids are monophyletic, including the sister taxa Tetraoninae and Meleagridinae. Conclusions The TinT information concerning relative fixation times of CR1 subtypes enabled us to efficiently investigate gamebird phylogeny and to reconstruct an unambiguous tree topology. This method should provide a useful tool for investigations in other taxonomic groups as well

Phylogenetic interrelationships of living and extinct Tinamidae, volant palaeognathous birds from the New World

Tinamous, one of the earliest diverging living avian lineages, consists of a Neotropical clade of palaeognathous birds with a fossil record limited to the early Miocene–Quaternary of southern South America. Here, we conduct a comprehensive, morphology-based phylogenetic study of the interrelationships among extinct and living species of tinamous. Morphological data of fossil species are included in a matrix of 157 osteological and myological characters of 56 terminal taxa. The monophyly of most recognized genera is supported by the results of the analysis. The cladistic analysis also recovers the traditional subdivision between those tinamous specialized for open areas (Nothurinae) and those inhabiting forested environments (Tinaminae). Temporal calibration of the resultant phylogeny indicates that such a basal divergence had already taken place in the early Miocene, some 17 million years ago. The placement of the fossil species within the open-area (Nothurinae) and the forest-dwelling (Tinaminae) tinamous is also consistent with the palaeoenvironmental conditions inferred from the associated fauna.Fil: Bertelli, Sara Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Miguel Lillo; Argentina. Natural History Museum of Los Angeles County; Estados UnidosFil: Chiappe, Luis M.. Natural History Museum of Los Angeles County; Estados UnidosFil: Mayr, Gerald. Forschungsinstitut Senckenberg; Alemani

Oldest fossil avian remains from the Indian subcontinental plate

We describe the oldest fossil avian remains of the Indian subcontinental plate, from the early Eocene of the Vastan Lignite Mine in Gujarat, India. Three incomplete coracoids and two scapulae are assigned to the new taxon Vastanavis eocaena, gen. et sp. nov. The coracoids resemble the corresponding bone of bustards (Otididae), but a reliable assignment is not possible without additional bones. Independent of their phylogenetic affinities the fossils are of potential biogeographic significance, because similar species are unknown from the well-studied Palaeogene avifaunas of Europe and North America

Cutting fertility? The effect of Cesarean deliveries on subsequent fertility and maternal labor supply

The incidence of Cesarean deliveries (CDs) has been on the rise. The procedure's cost and benefits are discussed controversially; in particular, since non-medically indicated cases seem widespread. We study the effect of CDs on subsequent fertility and maternal labor supply. Identification is achieved by exploiting variation in the supply-side's incentives to induce nonmedically indicated CDs across weekdays. On weekends and public holidays obstetricians' are less likely to induce CDs (due tighter capacity constraints in hospital). On Fridays and other days preceding a holiday, they face an increased incentive to induce CDs (due to their demand for leisure on non-working days). We use high-quality administrative data from Austria. Women giving birth on different weekdays are pre-treatment observationally identical. Our instrumental variable estimates show that a non-planned CD at parity one decreases life cycle fertility by almost 17 percent. This reduction in fertility translates into a temporary increase in maternal employment

Cutting Fertility? The Effect of Cesarean Deliveries on Subsequent Fertility and Maternal Labor Supply

The incidence of Cesarean deliveries (CDs) has been on the rise. The procedure's cost and benefits are discussed controversially; in particular, since non-medically indicated cases seem widespread. We study the effect of CDs on subsequent fertility and maternal labor supply. Identification is achieved by exploiting variation in the supply-side's incentives to induce non-medically indicated CDs across weekdays. On weekends and public holidays obstetricians' are less likely to induce CDs (due tighter capacity constraints in hospital). On Fridays and other days preceding a holiday, they face an increased incentive to induce CDs (due to their demand for leisure on non-working days). We use high-quality administrative data from Austria. Women giving birth on different weekdays are pre-treatment observationally identical. Our instrumental variable estimates show that a non-planned CD at parity one decreases life cycle fertility by almost 17 percent. This reduction in fertility translates into a temporary increase in maternal employment

Cutting fertility: The effect of Cesarean deliveries on subsequent fertility and maternal labor supply

The incidence of Cesarean deliveries (CDs) has been on the rise. The procedure's cost and benefits are discussed controversially; in particular, since non-medically indicated cases seem widespread. We study the effect of CDs on subsequent fertility and maternal labor supply. Identification is achieved by exploiting variation in the supply-side's incentives to induce non-medically indicated CDs across weekdays. On weekends and public holidays obstetricians' are less likely to induce CDs (due tighter capacity constraints in hospital). On Fridays and other days preceding a holiday, they face an increased incentive to induce CDs (due to their demand for leisure on non-working days). We use high-quality administrative data from Austria. Women giving birth on different weekdays are pre-treatment observationally identical. Our instrumental variable estimates show that a non-planned CD at parity one decreases life cycle fertility by almost 17 percent. This reduction in fertility translates into a temporary increase in maternal employment

Cutting fertility? The effect of Cesarean deliveries on subsequent fertility and maternal labor supply

The incidence of Cesarean deliveries (CDs) has been on the rise. The procedure's cost and benefits are discussed controversially; in particular, since non-medically indicated cases seem widespread. We study the effect of CDs on subsequent fertility and maternal labor supply. Identification is achieved by exploiting variation in the supply-side's incentives to induce non-medically indicated CDs across weekdays. On weekends and public holidays obstetricians' are less likely to induce CDs (due tighter capacity constraints in hospital). On Fridays and other days preceding a holiday, they face an increased incentive to induce CDs (due to their demand for leisure on non-working days). We use high-quality administrative data from Austria. Women giving birth on different weekdays are pre-treatment observationally identical. Our instrumental variable estimates show that a non-planned CD at parity one decreases life cycle fertility by almost 17 percent. This reduction in fertility translates into a temporary increase in maternal employment

Conditioned place preference for social interaction in rats: contribution of sensory components

A main challenge in the therapy of drug dependent individuals is to help them reactivate interest in non-drug-associated activities. We previously developed a rat experimental model based on the conditioned place preference (CPP) paradigm in which only four 15-min episodes of social interaction with a gender- and weight-matched male Sprague Dawley rat (1) reversed CPP from cocaine to social interaction despite continuing cocaine training and (2) prevented the reinstatement of cocaine CPP. In the present study, we investigated which of the sensory modalities of the composite stimulus “social interaction” contributes most to the rats' preference for it. If touch was limited by steel bars spaced at a distance of 2 cm and running across the whole length of a partitioning, CPP was still acquired, albeit to a lesser degree. If both rats were placed on the same side of a partitioning, rats did not develop CPP for social interaction. Thus, decreasing the available area for social interaction from 750 to 375 cm2 prevented the acquisition of CPP to social interaction despite the fact that animals could touch each other more intensely than through the bars of the partitioning. When touch was fully restricted by a glass screen dividing the conditioning chambers, and the only sensory modalities left were visual and olfactory cues, place preference shifted to place aversion. Overall, our findings indicate that the major rewarding sensory component of the composite stimulus “social interaction” is touch (taction)