124,679 research outputs found
Chironomid (Diptera, Chironomidae) species assemblages in northeastern Algerian hydrosystems
No full textThe aim of this paper was to analyze the distribution of chironomids (Diptera, Chironomidae), and determine their substrate preferences, from two hydrosystems located in northeastern Algeria: the Kebir-East and the Seybouse wadis. Sixty-five species were recorded in 49 sampling sites distributed along the main courses of the two hydrographic nets and their tributaries. The majority of taxa comprised cosmopolitan species widely distributed along these two hydrosystems. Cricotopus (Cricotopus) bicinctus showed the highest abundance and frequency of occurrence (29.52%) and was widespread in almost all the sampling sites. Species richness ranged from 4 to 23, Shannon diversity between 0.15 and 0.90, Evenness from 0.23 to 1. A cluster analysis was carried out to represent the different groups of sites sharing similar species composition. Agglomerative cluster analysis grouped the sampling sites into four clusters according to the community data. An Indval analysis was then carried out to detect indicator species for each group of the sampling sites. Cricotopus (Isocladius) sylvestris was indicator of the first group of the sampling sites. Orthocladius pedestris, Rheocricotopus chalybeatus and C. bicinctus were indicators of the second group, and Polypedilum cultellatum of the third group. The fourth group was not characterized by any species. Indval analysis allowed also to determine species preferences for substrate size: Corynoneura scutellata and Dicrotendipes nervosus emphasized a preference to fine gravel, and Glyptotendipes pallens to fine sand
Chironomid taxocenosis in a South Mediterranean wadi, the Kebir-East (Algeria)
No full textSUMMARY - Chironomid taxocenosis in a South Mediterranean wadi, the Kebir-East (Algeria) - A total of 37 chironomid species were
recorded during a survey of the catchment of the Kebir-East wadi, northeast Algeria. Chironomids spatial and temporal distributions were
investigated based on 23 sampling sites, situated mainly within the El Kala National Park, across 4 seasons. Chironomid assemblages in
the Kebir-East were similar to the ones known from other Mediterranean areas and were composed mostly of tolerant species (Chironomus
riparius, Cricotopus (Isocladius) sylvestris), but some intolerant species (Paratrissocladius excerptus, Parakiefferiella gracillima, Thienemanniella
partita) were present in some samples. A coinertia analysis was carried out to match 21 environmental variables at different
spatial scales with the 37 chironomid species recorded in 90 samples: A longitudinal gradient was found along the first axis, which accounted
for 42 % of the total variance; the samples ordered along the second axis, which accounted for 13 % of the total variance, were
separated according to water temperature, water chemistry and site’s morphometry. The influence of anthropogenic pressures was evaluated
with different benthic quality indices based on species diversity and on species optima (i.e. mean value of environmental variables
weighted for species abundance). Results showed that the trophic status index was influenced by water quality and habitat type (krenal,
rhithral, potamal), while the biotic indices were more influenced by season. To improve knowledge on the response of intolerant species,
we suggest the implementation of a regular, more intensive sampling program
Habitat selection of Coot (Fulica atra) and Moorhen (Gallinula chloropus) in a remnant Mediterranean wetland (Italy): Implications for conservation.
No full textWe investigated habitat selection in two abundant and widespread Palearctic rallids, the Coot Fulica atra and the Moorhen Gallinula chloropus across a range of wetland types. The distribution of these two species varied according to water depth as implied by the dominant vegetation present in the study area. Coots used most frequently wet dune slacks dominated by Phragmites australis whereas Moorhens were mostly present in anthropized ecotones. We argue that because these two species of rallids respond differently to various environmental pressures, they could be used as useful indicators in the biomonitoring of the general health of various types of wetlands
Goeridae G Ulmer 1903
No full textFamily Goeridae <p> <i>Silonella aurata</i> (Hagen 1864), <b>second record for the Aures region</b>.</p> <p>Rhaouat: 26.vii.2018, 2 larvae; 16.x.2018, 4 larvae; 05.v.2019, 2 larvae.</p> <p> This species was first described as <i>Selis brevipalpis</i> by Vaillant (1954) from “Ruisseau des Singes” in Oued Talha and in a small spring called Ain Fadha, on Mount Faraoun (Aures) at 1400 m a.s.l. It was also recorded at 1140 m a.s.l. from the headwaters of the Oued Sebaou (Raab & Yacine 2018). This species has a wide distribution in the Western Palearctic and is particularly frequent in Corsica, Sardinia, and Spain; it is also known from the Maghreb (Morocco, Algeria, and Tunisia) (Tobias & Tobias 2008).</p>Published as part of <i>Dambri, Besma M., Karaouzas, Ioannis, Samraoui, Boudjéma & Samraoui, Farrah, 2020, Contribution to the knowledge of the caddisfly fauna of Algeria: An updated checklist of Algerian Trichoptera with new records from the Aures region, pp. 221-232 in Zootaxa 4786 (2)</i> on page 226, DOI: 10.11646/zootaxa.4786.2.4, <a href="http://zenodo.org/record/3874719">http://zenodo.org/record/3874719</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Environmental factors affecting the distribution of Chironomid larvae of the Seybouse wadi, Northeastern Algeria
No full textA survey of the Seybouse wadi (North-Eastern Algeria) between 2008 and 2011 was conducted in 26 sampling sites located on the main river and its tributaries using chironomids. From 3264 collected larvae, forty-five chironomid species were identified, and were correlated to 13 environmental variables to predict determinant factors affecting their distribution. Indicator value (IndVal) analysis was first performed to determine indicator chironomid species according to several factors (sites, seasons, source distance, granulometry, conductivity, water temperature, dissolved oxygen, water velocity, pollution and the abundance of filamentous algae). Co-inertia analysis
(CoIA) supported the IndVal results, emphasising an upstream/downstream gradient in the first axis, while a granulometry gradient was emphasised by the second axis. A pollution gradient was also highlighted in the plane of the first two axes, separating tolerant Chironomus sp. 1, Cricotopus bicinctus and Cricotopus (Isocladius) sylvestris from intolerant species as Phaenopsectra flavipes, Rheotanytarsus sp.1 and Cladotanytarsus sp. 1
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Dr. Edwin Wright Collection: Author Unknown
No full textNotes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
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