Predation on black flies (Diptera: Simuliidae) by the carnivorous plant Pinguicula vulgaris (Lentibulariaceae) in northern Sweden

Adult back flies represented nearly 85% of 915 arthropods captured by the carnivorous plant Pinguicula vulgaris L. along a stream in northern Sweden. Two species, Cnephia eremites Shewell and Cnephia pallipes (Fries), accounted for more than 97% of the total number of captured black flies. By virtue of their large populations, site fidelity at lake outfalls, and concentrated activity near the ground, these flies provide a predictable supply of prey that could affect the fitness of streamside carnivorous plants

Catches of bloodsucking blackflies (Diptera: Simuliidae) tell different stories depending on sampling method

To compare different sampling techniques, blackflies were captured along six Swedish rivers in 2001 and 2002, using two fundamentally different methods: (1) daytime trapping with a vehicle-mounted net, and (2) exposure of CO2-baited traps. The methods were selectively different for different species of blackflies. Some species were caught relatively more frequently by vehicle trapping and others by CO2 trapping. Only rarely were species catches proportionally similar between the two methods.We suggest that the different catch success reflects differences in host-searching behaviour in the species present and that the sampling methods are complementary

Catches of bloodsucking blackflies (Diptera: Simuliidae) tell different stories depending on sampling method

To compare different sampling techniques, blackflies were captured along six Swedish rivers in 2001 and 2002, using two fundamentally different methods: (1) daytime trapping with a vehicle-mounted net, and (2) exposure of CO 2 -baited traps. The methods were selectively different for different species of blackflies. Some species were caught relatively more frequently by vehicle trapping and others by CO 2 trapping. Only rarely were species catches proportionally similar between the two methods. We suggest that the different catch success reflects differences in host-searching behaviour in the species present and that the sampling methods are complementary

Using Personas to Guide Education Needs Analysis and Program Design

The undergraduate programs within electrical engineering, computer science and engineering and software engineering at Chalmers are currently under revision. Some notable problems for these programs are the long-term trends of diminishing number of applications and a low share of female students. This paper first describes the stakeholder’s needs analysis phases of the project, where current occupational roles for these types of engineers were mapped out in order to find out what knowledge skills and attributes that are necessary to work as an engineer in this field. These occupational roles were then used to guide the program concept design phase of the project. As the number of occupational roles is large, a persona methodology was used to gather all the necessary information into a graspable format. Personas have for a long time been used in e.g. software development for describing users/customers. We adapted this methodology to describe the future professional roles of engineering graduates. The personas were based on information gathered through workshops with Chalmers staff and representatives from the local business sector, alumni surveys and observational journals from working engineers as well as documentation from different organizations on the future demands on engineers. The paper then describes the program concept design phase of the project, where the personas were used as reminders for the design team that the roles for engineers at work are broad and contain many tasks and aspects that are traditionally not covered in engineering education. These many tasks need to be considered in the curriculum. In particular, the personas were helpful in the work of designing new and more diverse profiles at the bachelor level. In addition, the personas work, which was performed rather broadly across the departments involved in these five programs, has served as a basis for making the premises for the succeeding revision well known across the organization

The chemical bonds in CuH, Cu2, NiH, and Ni2 studied with multiconfigurational second order perturbation theory

The performance of multiconfigurational second order perturbation theory has been analyzed for the description of the bonding in CuH, Cu2, NiH, and Ni2. Large basis sets based on atomic natural orbitals (ANOS) were employed. The effects of enlarging the active space and including the core‐valence correlation contributions have also been analyzed. Spectroscopic constants have been computed for the corresponding ground state. The Ni2 molecule has been found to have a 0+g ground state with a computed dissociation energy of 2.10 eV, exp. 2.09 eV, and a bond distance of 2.23 Å. The dipole moments of NiH and CuH are computed to be 2.34 (exp. 2.4±0.1) and 2.66 D, [email protected] ; [email protected] ; [email protected]

Theoretical characterization of the lowest-energy absorption band of pyrrole

The lowest-energy band of the electronic spectrum of pyrrole has been studied with vibrational resolution by using multiconfigurational second-order perturbation theory (CASPT2) and its multistate extension (MS–CASPT2) in conjunction with large atomic natural orbital-type basis sets including Rydberg functions. The obtained results provide a consistent picture of the recorded spectrum in the energy region 5.5–6.5 eV and confirm that the bulk of the intensity of the band arises from a ππ∗ intravalence transition, in contradiction to recent theoretical claims. Computed band origins for the 3s,3p Rydberg electronic transitions are in agreement with the available experimental data, although new assignments are suggested. As illustrated in the paper, the proper treatment of the valence–Rydberg mixing is particularly challenging for ab initio methodologies and can be seen as the main source of deviation among the recent theoretical results as regards the position of the low-lying valence excited states of [email protected] ; [email protected]

A theoretical study of the 1B2u and 1B1u vibronic bands in benzene

The two lowest bands, 1B2u and 1B1u, of the electronic spectrum of the benzene molecule have been studied theoretically using a new method to compute vibronic excitation energies and intensities. The complete active space (CAS) self-contained field (SCF) method (with six active π-orbitals) was used to compute harmonic force field for the ground state and the 1B2u and 1B1u electronic states. A linear approximation has been used for the transition dipole as a function of the nuclear displacement coordinates. Derivatives of the transition dipole were computed using a variant of the CASSCF state interaction method. Multiconfigurational second-order perturbation theory (CASPT2) was used to obtain absolute excitation energies (12 active π-orbitals). The results show that the approach works well. Vibrational progressions are well described in both bands and intensities, and energies are in agreement with experiment, in particular when CASPT2 derived geometries are used. One interesting result is that computed vertical energies fall about 0.1 eV on the high energy side of the band [email protected]

Continental-Scale Effects of Nutrient Pollution on Stream Ecosystem Functioning

Excessive nutrient loading is a major threat to aquatic ecosystems worldwide that leads to profound changes in aquatic biodiversity and biogeochemical processes. Systematic quantitative assessment of functional ecosystem measures for river networks is, however, lacking, especially at continental scales. Here, we narrow this gap by means of a pan-European field experiment on a fundamental ecosystem process—leaf-litter breakdown—in 100 streams across a greater than 1000-fold nutrient gradient. Dramatically slowed breakdown at both extremes of the gradient indicated strong nutrient limitation in unaffected systems, potential for strong stimulation in moderately altered systems, and inhibition in highly polluted streams. This large-scale response pattern emphasizes the need to complement established structural approaches (such as water chemistry, hydrogeomorphology, and biological diversity metrics) with functional measures (such as litter-breakdown rate, whole-system metabolism, and nutrient spiraling) for assessing ecosystem health