Johan Ingelsfreelance ornithologist - In memorium
Johan Ingels
(In Memorium)
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Introduction
Skills and Expertise
Publications
Publications (61)
Rusty Tinamou Crypturellus brevirostris is an elusive, ground-dwelling bird of terra firme forest. Although widespread across Amazonian Brazil, the Guiana Shield and extreme south-east Colombia, it is everywhere uncommon. Frequently, only its distinctive voice betrays its presence and therefore most contacts with this tinamou are auditory. Here, we...
A total of 13 owl species, 1 Tytonidae and 12 Strigidae, have been recorded in French Guiana. Twelve of them are resident species, and one, the short-eared owl Asio flammeus, is a rare vagrant, probably from north-western South America. Two species have been recorded for the first time in recent years: the Roraiman (vermiculated) screech owl Megasc...
Clutch size of Blackish Nightjar Nyctipolus nigrescens is generally considered to be one egg. Records of two-egg clutches mentioned in ornithological literature of the 19th and early 20th century are possibly mistakes or misidentifications. However, we report a documented recent observation of a female incubating two eggs. © 2017 The Authors; Journ...
The Black-collared Hawk Busarellus nigricollis is widespread from southern Mexico throughout Central America and east of the Andes in South America. Although rather common in most of its distribution range, little is known about its breeding biology as nests are often built in inaccessible areas. The discovery in 2013 of four nests of this hawk in...
Until now, the nests of only six of the 12 species of tody-flycatchers of
the genus Poecilotriccus have been described. We present general information on
the breeding biology of Smoky-fronted Tody-Flycatcher Poecilotriccus fumifrons in
French Guiana. Nests we found were similar to those of other Poecilotriccus species
for which the nest is known, i...
Setopagis maculosa (Todd, 1920) (Aves: Caprimulgidae) was described based on a single male specimen collected by Samuel Milton Klages in French Guiana, northeastern South America. Since then, no new specimens have been collected nor have any reliable records been made, and the validity of the species has been questioned. A detailed analysis of the...
Setopagis maculosa (Todd, 1920) (Aves: Caprimulgidae) was described based on a single male specimen collected by Samuel Milton Klages in French Guiana, northeastern South America. Since then, no new specimens have been collected nor have any reliable records been made, and the validity of the species has been questioned. A detailed analysis of the...
Although widespread throughout Amazonia, little is known of the breeding biology of Black-bellied Cuckoo Piaya melanogaster and its nest has not been described. We found two nests in French Guiana, both with two nestlings. The open, cup-shaped nests were constructed with twigs, pieces of vine and dead leaves within dense tangles of vines. The nestl...
We present the first details of nesting sites, eggs, and chicks of the Pygmy Nightjar (Nyctipolus hirundinaceus), a small nocturnal bird endemic to northeastern Brazil. We conducted behavioral observations near Curaçá in northern Bahia, and at Potengí, southern Ceará, both located in the heart of the Brazilian Caatinga. We found four 'nests' in Bah...
We discuss the choice of habitats for roosting and breeding by the Pygmy Nightjar (Nyctipolus hirundinaceus), a Brazilian endemic from the eastern part of the country. We observed that the choice of nesting and roosting sites of this nightjar is closely connected to open gravelly and stony areas (lajeiros) in the Caatinga and to rocky outcrops (ped...
The Straight-billed Woodcreeper (Dendroplex picus) is largely insectivorous, but sporadically feeds on small vertebrates. It breeds in cavities, which makes it difficult to follow its breeding cycle. We report here on the use of thin dry branches and strips of bark of considerable length to provide a foundation for the actual nest in a deep woodpec...
The Freckled Nightjar Caprimulgus tristigma and the Blackish Nightjar C. nigrescens are widespread and common within their rupicolous habitat, in the Afrotropics and Neotropics respectively, and may therefore be considered as successful in their adaptation to this habitat, a niche that has not been exploited by any other nightjar species. However,...
I report a nest, nestling care, and the breeding season of the Spangled Cotinga (Cotinga cayana) near Saül, French Guiana. The open cup nest was found on 20 October 2007 with a 15–20 days old nestling, ∼12 m above ground in a yellow mombin tree (Spondias mombin). Nest activities were followed during 4 days, from dawn to dark. The nestling's plumage...
An electronic measuring system to determine ion time-of-arrival spectra in drift tubes is described. The system consists of a CAMAC crate interfaced to a minicomputer. An instrument with a great adaptive power, wide range of acceptable drift times and very short dead time has been realised. The circuitry and computer program used to perform the mea...
We describe the opportunistic adaptation to man-induced changes in the habitats of six neotropical Caprimulgidae. Habitats created by those changes, and similar to their original and usual ones, are readily occupied by these nightjars. The occasional invasion of urban environments ("urbanization") is the most recent and most remarkable behavioural...
A modified Mattauch-Herzog analyzer developed for positive ion
measurements in the mass range of 12 to 500 microns is described. The
design parameters and first laboratory tests results obtained with it
are described. The ions are mass-separated in combined toroidal
electrostatic and constant magnetic fields. The simultaneous measurement
of a spect...
An overview is given of the positive ion composition measurements performed with balloon-borne ion mass spectrometers in the Earth's atmosphere between 20 and 45 km. In particular, attention is paid to the derivation of the acetonitrile volume mixing ratio profile.The results are compared with model calculations, data obtained with airplane-borne i...
Acetonitrile volume mixing ratios are derived from positive ion spectra obtained with a balloon-borne quadrupole mass spectrometer in an altitude region from 21 to 32 km. Comparison of the results with data obtained in previous flights suggests a larger deviation from reference profiles, probably due to temporal transport phenomena.From negative io...
Mixing ratio measurements of several stratospheric trace constituents were performed during the MAP/GLOBUS 1983 campaign by infrared and microwave techniques. The i.r. results indicate a wavelike disturbance in the stratosphere. Similar structures were also found by other experiments as cryo sampling, ion spectrometer, and various O3 measurements....
Recent progress in the technology of stratospheric ion mass spectrometry
is described. The state of the art as well as some typical measuring
problems and needs for future developments are briefly reviewed.
A set of results about the positive ion composition of the stratosphere,
consisting of some recently obtained as well as some previously reported
data, is presented and analyzed. It is compared with model calculations
described in a companion paper. A review of the abundances of proton
hydrates and nonproton hydrates shows that the latter most prob...
The presence of acetonitrile in the atmosphere was confirmed by results of surface and stratospheric investigations. Stratospheric measurements give mixing ratios typically decreasing with height from 3 ppt at 25 km to 0.5 ppt at 40 km. Measurements at the Earth's surface are less unanimous, although a ground level background mixing ratio of a few...
Ion spectra obtained during three balloon flights performed in June
1982, September 1982, and September 1983 are reported. The lower
altitude limit of the measurements is imposed by the decrease of the
instrument sensitivity and the upper limit by present ballooning
techniques. At high altitudes the ion spectra are disturbed by
contamination, where...
Recent in situ measurements with balloon borne quadrupole mass spectrometers, between 20 and 45 km altitude, are reviewed and discussed.The major stratospheric positive ions observed are proton hydrates [H+(H2O)n] and non proton hydrates of the form H+Xm(H2O)2. The data analysis allows a derivation of the vertical mixing ratio profile of X (most pr...
Negative ion composition in the stratosphere was measured between 22 and
45 km altitude with a balloon-borne quadrupole mass spectrometer. At
high altitudes the ion spectra may be disturbed by contamination,
whereas at low altitudes ion cluster break up is a severe problem. The
relative abundances of the different ion mass peaks, mainly belonging t...
The nature of negative ions in the altitude region 42–45 km has been investigated by means of a balloon borne mass spectrometer. Apart from the NO3− and HSO4− clusters, ions with different cores, which can be identified as CO3−, HCO3−, Cl− and ClO3− were observed. The spectra have been used to estimate the sulfuric acid number density at 45.2 and 4...
The vertical distribution of acetonitrile between 0 and 55 km altitude is calculated assuming that CH3CN is released at the Earth's surface and that the main loss process in the stratosphere is the reaction with hydroxyl radicals. The influence of different possible surface concentrations is investigated. The role of the destruction of CH3CN by Cl,...
Although ion chemistry models1,2 have predicted proton hydrates (PH) that is ions of the form H+(H2O)n, as major ions in the stratosphere, the first in situ mass spectrometric measurements3–5 revealed another ion family, called non-proton hydrates (NPH). The fractional abundance of these NPH, represented by H+Xl(H2O)m, increases from 1 to 90% betwe...
Eutrombicula yunkeri is described as new from specimens collected from the Blackish Nightjar, Caprimulgus nigrescens, and an iguanid lizard, Tropidurus torquatus, taken in Surinam.
Negative ion composition measurements obtained during a valve controlled balloon flight are utilized in order to derive the number densities of (H2SO4 + HSOy) between 25 and 34 km altitude. A comparison is presented between the experimental results and similar results obtained for other stratospheric temperatures. The implications of these results...
Valve-controlled-balloon-borne quadrupole-mass-spectrometer measurements
of proton hydrates, nonproton hydrates of the form H(+)X(l)(H2O)(m), and
heavy-mass ions at altitudes from 30 to 22 km are reported. Data were
collected on two daytime flights from Gap-Tallard, France, in June 1981
and 1982; the rate of descent of the 100,000-cu-m balloon was...
Thraupis episcopus and T. palmarum are sympatric in the greater part of their range, and exhibit a wide ecological tolerance. Both species are nearly similar in their general behaviour, vocalizations, reproduction, food and feeding habits, but each species demonstrate habitat and sub-habitat preferences, different foraging strategies, divergent cho...
Negative ion spectra obtained during four flights with a balloon-borne quadrupole mass spectrometer are reported and critically investigated. Ion abundances for NO3− and HSO4− core ions are reported and concentrations of HNO3 and H2SO4 at altitudes between 32 and 35 km are deduced. The detection of minor mass peaks in negative ion spectra obtained...
Positive ion spectra obtained from measurements with a balloon-borne mass spectrometer during three balloon flights are critically investigated and compared with other data. Ion abundances for proton hydrates [H+(H2O)n ions] at different stratospheric temperatures are compared, as well as the abundances of non proton hydrates H+Xitl(H2O)m, X being...
Composition measurements of negative ions in the stratosphere were performed at altitudes near 35 km by means of a balloon borne quadrupole mass spectrometer during two balloon flights. Some typical ion spectra are shown and discussed. The observed ions were identified as NO3(-).nHNO3 and HSO4.HNO3.mH2SO4 HSO4(-).nHNO3.mH2SO4 clusters. Hydrated clu...
There has been recent considerable interest in the stratospheric ion composition and ion chemistry, especially in view of its possible impact on aerosol formation1,2 and the possibility of detection of minor constituents with very low concentrations3,4. The first composition measurements of positive ions in the stratosphere conducted by a rocket-bo...
The design, technical characteristics, and test and flight results of a liquid helium cryopump and an opening device operating on board a balloon‐borne mass spectrometer combining a cryopump and a quadrupole mass filter are reported. The gas inlet of this mass spectrometer is opened through a simple and reliable remote‐controlled system, which is a...
THE ion composition of the upper atmosphere has been the subject of many experiments. Early mass spectrometer measurements have been primarily concerned with the ion composition at altitudes between 60 and 250 km (refs 1–6). Few data, however, are available on the charged particle composition of the stratosphere. Global ion density measurements usi...
A system combining a quadrupole mass spectrometer with a helium cooled cryopump has been developed for the measurement of the ion composition above 35 km altitude. The characteristics of the instrument are discussed.
Magnetic circular dichroism was measured in the U2 bands in KCl, KBr, KI, RbBr, RbI, and CsI. By an analysis of the data using the method of moments the spin-orbit splitting of the excited states was determined. Absorption spectra of the U2 centres in RbBr, RbI, CsBr, and CsI and some of the optical properties of these compounds are also reported....
I present information about the breeding habitat of the Black-and-white Tanager (Conothraupis speculigera) in the province of Loja, Ecuador. Quantitative data on nest composition and egg coloration and variation, is provided. Nest parasitism is also documented.
Projects
Project (1)
This research programme was active between 1972 and ca. 2000 at the Royal Belgian Institute for Space Aeronomy. However, most members of the research group are no longer active as researcher, e.g. I am retired now. The head of the group, Etienne Arijs, passed away in 2006. There are no scans or pdfs of our publications. Sorry !
Regards, Johan Ingels. johan.ingels@skynet.be
