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1

Checklist of freshwater red algae (Rhodophyta) in Bosnia and Herzegovina

Šovran Sanja, Knežević Ana, Mašić Ermin

Oceanological and Hydrobiological Studies

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2024

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Vol. 53, No. 2

127--143

EN

The paper provides an overview of all freshwater red algae species recorded to date in the territory of Bosnia and Herzegovina. Based on fieldwork and analysis of all available previously published data, it was determined that a total of 15 taxa from eight genera have been recorded to date: Bangia (1), Audoinella (3), Batrachospermum (2), Peludicola (1), Shaethia (1), Lemanea (4), Paralemanea (2) and Hildenbrandia (1). All taxa were found in clear, cold, well-oxygenated water. Bosnia and Herzegovina is very rich in different types of aquatic habitats. More than 100 sites were visited during the field research, but there are still many potential habitats where freshwater red algae can be found, which will be explored in the coming years. This work is the first step toward establishing long-term monitoring and listing of protected and threatened red algae in Bosnia and Herzegovina.

2

Low abundance and high patchiness of decapod fauna sampled with van Veen grab on the West African continental margin (Gulf of Guinea, Ghana)

Podwysocki Krzysztof, Pabis Krzysztof, Palero Ferran, Błażewicz Magdalena, Serigstad Bjørn

Oceanologia

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2024

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Vol. 66 (2)

220--238

EN

Sixty morphospecies of Decapoda (Malacostraca: Crustacea) representing 34 families were recorded in the material collected in 2012 from 265 van Veen grab (0.1 m2) samples, from the nine transects distributed along the coast of Ghana in the 25–1000 m depth range. The examined material was dominated by the Diogenidae, Panopeidae, Leucosiidae, Pilumnidae and Xanthidae families. Species accumulation curves showed undersampling of the studied area and a large number of the morphospecies comprised singletons and doubletons. Panopeus africanus was the most frequent morphospecies in the analysed material (9.1% of all samples). We observed a substantial decrease of diversity (Shannon Index) and abundance along a depth gradient. Species richness also decreased with depth, starting from the highest number of morphospecies ‒ 38 at 25 m depth, then 33 at 50 m, 17 at 100 m, 11 at 250 m, 8 at 500 m and ending with 1 morphospecies at 1000 m bottom depth. Higher diversity was observed on the continental shelf (25–250 m – 57 morphospecies), while on the slope (500–1000 m) only eight morphospecies were recorded. Numerous factors of natural and anthropogenic origin may affect decapod communities on the coast of Ghana. Since our material was collected using a sampler collecting material at a very small scale, the observed patterns might be affected by the sampling method.

3

Ecological risks assessment of fishery commodities from heavy metal in The East Java Province, Indonesia

Andriyono Sapto, Hidayati Nuning V., Fitrani Mirna, Manaf Latifah A., Habib Ahasan, Dewi Umi U., Mukadar Saadah

Journal of Water and Land Development

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2024

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no. 60

183--193

EN

Heavy metals are a crucial group of chemicals extensively used in materials to meet human needs, eventually leading to contamination of aquatic ecosystems and accumulation in organism’s tissues. Heavy metals enter the aquatic ecosystem from various sources. Those metals that pollute aquatic waters are deposited in sediments, remain dissolved in water or accumulate in the food web of aquatic organisms. Benthic biota is believed to accumulate the highest levels of these metals, while other aquatic animals, such as fish, shrimp, and macroalgae, serve as significant sources of heavy metals intake through food and the environmental exposure. Ina study conducted in and around the east Java, Indonesia, the concentration of heavy metals in commercially important fish species, shellfish, and macroalgae were evaluated using an inductive couple plasma-mass spectrometer (ICP-MS). This study is very important because fishery resources are not only vital for exports but also serve as a primary source of essential food for local communities. The results showed that heavy metal concentration (Pb, Cd, and Hg) in samples were 12.3 mg∙dm-3 , 0.171 mg∙dm-3, and undetectable, respectively. This study showed that different metals were present in the samples at different levels, all of which fell within the maximum residual levels set by the EU and USFDA. The results of an analysis of food safety based on the Hazard Index showed values below 1 point, indicating that fishery products (fish, shrimp, and macroalgae) from the East Java Province are generally safe for human consumption.

4

Drzewa i krzewy z korzyścią nie tylko dla ludzi

Korbik Mateusz

Zieleń Miejska

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2023

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Nr 11

22--23

PL

Mówiąc o zieleni i korzyściach z niej płynących, mówimy zwykle o nas – ludziach. Należy jednak pamiętać, że jako mieszkańcy miasta nie jesteśmy sami. Są też zwierzęta, które mają takie samo prawo do korzystania z tego, co nas otacza.

5

Inclusive cities. Diversity and inclusion in city marketing

Daszkiewicz Magdalena

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2023

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z. 173

93--112

EN

Purpose: The article aims to examine how cities incorporate diversity and inclusion into their policies and marketing practices. Design/methodology/approach: The research was carried out using a case study with an exploratory qualitative approach. The case study was conducted involving two European cities, Barcelona and Wroclaw. The content analysis of official documents and publicised materials was the basis for describing each city's inclusive strategic policies and marketing initiatives. Considerations based on the literature review and case study led to the conclusions about the strategic role of diversity and inclusion context in city marketing and the use of inclusive marketing in cities’ practices. Findings: By supporting diversity and inclusion, inclusive marketing contributes to developing inclusive cities by creating a climate of equal opportunity and stimulating stakeholder engagement. Marketing cities through diversity and inclusion also strengthens internal and external city image. Practical implications: The article's considerations highlight the essential role of diversity and inclusivity in marketing cities. Demonstrating the value, possibilities, and ways to implement inclusive marketing can contribute to its broader and more strategic use in the practice of cities. Originality/value: Despite growing challenges, inclusive marketing in a territorial context has so far been an understudied area. The article launches the scientific discussion on diversity and inclusion in city marketing, forming the basis for further exploration and developing model solutions.

6

Diversity of Aphids Associated with Field and under Greenhouse Crops (Wheat, Barley and Chili Pepper) across the Dryland Climate in Algeria

Bakroune Nourelhouda, Hachemi Ali, Ouamane Abdelmoneim Tarek, Boultif Meriem, Rouahna Houria

Journal of Ecological Engineering

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2023

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Vol. 24, nr 4

99--109

EN

The aim of this study was to investigate the diversity of aphids associated with the field and under greenhouse crops in an arid climate in southeastern Algeria (Biskra province). Using yellow basins for the insects sampling, a total of 6683 specimens of aphids were collected and identified into 33 species, five (05) subfamilies: Aphidinae, Pemphiginae, Chaitophorinae, Pterocommatinae, and Greenideinae; and six tribes: Aphidini, Macrosiphin, Pemphigini, Panaphidini, Chaitophorini and Greenideini, and 22 genera. The Macrosiphini tribe is quantitatively most dominant with 20 species (61%) of the inventoried aphid population, followed by the aphidini which groups together 9 species representing 27% of the aphids inventoried. The other tribes are less represented, including one species for each tribe (12% in total). Aphis gossypii was the predominant species 29.67% of the inventoried species, followed by Rhopalosiphum maidis (15.22%) and Rhopalosiphum padi (15.07%). In terms of total wealth (S), there was a strong and positive correlation between the diversity of aphids and crops (R2 = 0.73), and also a significant relationship (df = 15, Pr > F = 0.024). Shannon’s index spatial interpolation indicates a higher diversity on agricultural lands in the study area. Shannon’s diversity and evenness index values were greater in pepper under greenhouse in Dhibia station (H′ = 2.01, E = 0.84) compared to barley and wheat, in El Haouch and Saada, respectively (H′ = 1.18, E = 0.30 and H’ = 1.45, E = 0.21).

7

The impact of diversity on job performance: evidence from private universities in Egypt

Said Dina, Youssef Dina, El-Bayaa Nourhan, Alzoubi Yehia Ibrahim, Zaim Halil

Acta Innovations

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2023

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no. 49

17--30

EN

Employees from diverse backgrounds have been claimed to perform better; nevertheless, this link has been studied sparingly in the Egyptian setting. This paper addresses this gap by experimentally analyzing the link between employee performance and gender, educational background, and ethnic background. To investigate this link, a usable model was created, and data was collected from 269 academic staff members at private Egyptian institutions. PLS analysis was used, and the result revealed that educational and ethnic backgrounds have a positive effect on employees’ job performance whereas, the impact of gender background on employee’s job performance was found to be insignificant. Furthermore, the research findings disclose that the education and ethnic background of the employees mediates the relationship between employees’ job performance and gender diversity. Future research is yet to validate these results.

8

Is employee diversity relevant? Assessment of the impact of diversity management on soft and hard aspects of management

Olejniczak-Szuster Katarzyna

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2022

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z. 159

327--336

EN

Purpose: The dynamics of changes taking place in the environment, globalization, increasing competition entail many changes concerning the management and operation of the organization. One of the conditions ensuring the proper functioning of the enterprise is the implication of diversity management, the objective of which is to promote equality and diversity in the workplace. This approach ought to be treated as a developed concept of talent management in the organization, with particular emphasis on equal opportunities, counteracting discrimination, employee integration and the moral and ethical dimension of management. This manner of conducting a business is based on universal values that help enterprises to achieve their business objectives. Design/methodology/approach: The research task was carried out on the basis of the subject literature and the results of the survey conducted in the fourth quarter of 2020 among 343 diversified employees. The empirical analysis workshop allowed for the assessment of the impact of actions taken for the benefit of diversity management, as well as the possession of the diversity potential on soft and hard aspects of management. Findings: The conducted analyses indicated that diversity management has a significant impact on holistic business management. This is confirmed by both positive and negative relationships between the characteristics analyzed. Originality/value: Little research does relate to the assessment of operations in terms of diversity management or evaluation of the diversity potential and their impact on the holistic (including soft and hard aspects) management of the enterprise. This creates a re-search gap and implies the possibility of acquiring real knowledge of the impact of diversity management on the functioning (soft and hard aspects) of a modern enterprise.

9

Top management team diversity and firm performance in digital era

Velinov Emil, Konovalova Natalia

Polish Journal of Management Studies

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2022

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Vol. 26, No. 2

396--410

EN

The paper sheds light on impactful diversity dimensions of upper echelons across German companies and their impact on the appointment of Chief Digitalization/Information Officer during the turbulent years of internet of things and digitalization in the second decade of the twenty-first century. The study consists of a literature review on diversity across senior management of German firms in a digital era characterized by global business technological digital disruption. The paper discusses how the emerging phenomena of diversity across top management affect firm performance during the period of incremental innovation and turbulent digital trasnformation of multinational firms. The novelty of the study is nested in the fact that it provides evidence from top management teams' diversity from the advanced markets, such as Germany, where digitalization is one of the priorities of the German government but also of the German business in order to drive long-term firms’ performance and firms’ sustainability. The motivation behind conducting the research on top management teams' diversity across top German companies in the digital era is the fact that the crucial importance of senior management skills, competencies and knowledge are key factors for firm performance and prosperity. Moreover, in Germany, many of the most successful firms have appointed executive positions in their top management in order to manage the rapid shift towards more digitalized business and higher firm performance in a volatile global business environment. Study results show that top management team diversity positively affects the appointment of Chief Digitalization/Information Officer. Also, the paper results show that firms with incumbent Chief Digital Officers in their top management team tend to be more intact with the digital era than firms that have not appointed any Chief Digitalization Officer.

PL

Artykuł rzuca światło na istotne wymiary różnorodności zespołu najwyższego kierownictwa w niemieckich firmach oraz ich wpływ na powoływanie dyrektora ds. digitalizacji / informacji w burzliwych latach Internetu rzeczy i cyfryzacji w drugiej dekadzie XXI wieku. Badanie składa się z przeglądu literatury w tematyce różnorodności wśród kadry kierowniczej wyższego szczebla niemieckich firm ery cyfrowej, charakteryzującej się globalnymi zakłóceniami technologicznymi i cyfrowymi. W artykule omówiono, w jaki sposób pojawiające się zjawiska różnorodności w obrębie najwyższego kierownictwa wpływają na wyniki firm w okresie innowacji przyrostowych i burzliwej transformacji cyfrowej firm międzynarodowych. Nowością w badaniu jest fakt, że dostarcza ono dowodów pochodzących z różnorodnych zespołów najwyższego kierownictwa z rynków rozwiniętych, takich jak Niemcy, gdzie cyfryzacja jest jednym z priorytetów niemieckiego rządu, ale także niemieckiej gospodarki ukierunkowanej na napędzanie długoterminowych wyników firm i ich trwałości. Motywacją do przeprowadzenia badania dotyczącego różnorodności zespołów zarządzających w czołowych niemieckich firmach w erze cyfrowej jest fakt, że umiejętności, kompetencje oraz wiedza kadry zarządzającej wyższego szczebla są kluczowymi czynnikami wpływającymi na wyniki i bogactwo t firmy. Ponadto w Niemczech wiele firm odnoszących największe sukcesy wyznaczyło stanowiska kierownicze, aby zarządzać szybką zmianą w kierunku bardziej zdigitalizowanej gospodarki i lepszych wyników firm w niestabilnym globalnym środowisku biznesowym. Wyniki badania pokazują, że różnorodność kadry najwyższego kierownictwa pozytywnie wpływa na powołanie dyrektora ds. digitalizacji / informacji. Ponadto, wyniki badania pokazują, że firmy, które mają w swoim zespole dyrektora ds. digitalizacji, wydają się być bardziej odporne na erę cyfrową niż firmy, które nie powołały dyrektora ds. cyfryzacji.

10

Spatial Distribution and Diversity of Marine Zooplankton Adjacent to the St. Martin's Island, Bangladesh

Alam Md. Jobaer, Kamal A. S. M. Maksud, Ahmed Md. Kawser, Khondker Moniruzzaman, Fayyaz Rafid

Journal of Ecological Engineering

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2022

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Vol. 23, nr 10

154--163

EN

Bangladesh, a country that lies on the north shores of the Bay of Bengal, has been blessed with a plethora of natural resources. St. Martin’s Island, the only coral-bearing island in Bangladesh, is undoubtedly regarded as one of the most prized possessions. It is rich in biodiversity, but truly scientific information on it is lacking. In the present investigation, 14 stations adjacent to St. Martin’s Island within the Bay of Bengal were sampled for determining the composition, spatial distribution, species richness, and diversity of pelagic zooplankton. Samples were collected in the pre-monsoon hot season. From the community of zooplankton, 34 species were reported. Most of the species belonged to copepods. Besides, Polychaeta and Cirripedia were also present in the community. The most significant species belonged to Oithona, Canthocalanus, Balanus, Euterpina, and Microsetella. Total zooplankton standing crop varied from 45,000–125,000 ind/m3 and the highest number of species (8) were observed at station 7. Strong variability in the distribution of species was observed in the studied stations. The number of genera collected at each station varied from 4–8. Data on species richness (Df) varied from 1.30–3.04 and that of the Shannon-Wiener Index (H) from 1.33–1.93. The species composition of zooplankton and the species richness and the diversity index of the population was comparable to the other studies carried out in the Central and Western Bay of Bengal.

11

Assessing benthic macroinvertebrates in relations to environmental variables and revitalisation works

Czerniawska-Kusza Izabela

Ecological Chemistry and Engineering. S

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2022

|

Vol. 29, nr 1

99--110

EN

Macroinvertebrates of two ex-manor ponds located in Chroscina, Opole Region (Poland) were studied from 2015 to 2018 to investigate their community composition and diversity and evaluate the heterogeneity of communities on spatial and temporal scale referring to environmental variables and revitalisation work. A total of 32 taxa were recorded (at the family level, except Oligochaeta), 13 of which were Ephemeroptera, Odonata and Trichoptera, recognised as sensitive groups in lentic ecosystems. Macroinvertebrate richness and diversity varied considerably, especially in spring and summer. It was found that habitat heterogeneity influenced benthic invertebrates more than basic water parameters. However, the environmental variables together accounted for only 38 % of the observed variations. Thus, other factors, such as fish predation, may have played a leading role in community shaping. The distinct differences between pond communities, four years after the revitalisation works, resulted more from different habitat features than from the previous sediment removal.

12

Projekty studenckie przekształcenia wybranych stref kampusu akademickiego w dydaktyce

Zalewski Krzysztof, Rosłon Katarzyna

Builder

|

2021

|

R.25, nr 7

62--65

PL

Kampusy akademickie kojarzą się z tętniącymi życiem przestrzeniami wypełnionymi mieszanką interakcji interpersonalnych, których użytkownikiem jest społeczność akademicka. Ze względu na zaangażowanie samych zainteresowanych, partycypację jednostek uczelni, możliwość interdyscyplinarnej współpracy, styczność z realnymi zadaniami i problemami - studenckie projekty architektoniczne różnych obszarów kampusu są interesującym oraz badawczym materiałem dydaktycznym, szczególnie w zakresie kreacji przestrzeni elastycznej i wielofunkcyjnej, dostępności oraz zrównoważonego rozwoju. Podnoszą także jakość życia, jego różnorodność oraz kreują wizerunek uczelni. Niniejszy artykuł opisuje przykład współpracy projektowej odpowiadającej na realne zapotrzebowanie - projekt wnętrz pomieszczeń Działu Współpracy z Zagranicą Politechniki Śląskiej - wyniku pracy zespołów projektowych studentek i studentów Politechniki Śląskiej w Gliwicach pod kierunkiem autorów artykułu.

EN

Academic campuses are associated with vivid spaces, filled with a mix of social activity and interaction, whose users are the academic community – students in particular. Due to the involvement of users themselves, participation of university units, the possibility of interdisciplinary cooperation, contact with real tasks and problems - student’s architectural projects of various areas of the campus are both an interesting didactic and research topic, especially in terms of creating a flexible and multifunctional space, accessibility, sustainable development - in particular, improving the quality of life and diversity, or creating the image of the University. This article describes an example of design cooperation responding to real demand - interior design of the International Cooperation Department of the Silesian University of Technology - the result of the work of design teams of students of the Silesian University of Technology in Gliwice, Faculty of Architecture and Interior Design, under the supervision of the authors of the article.

13

The determinants of the business performance of commercial banks: A case study of Vietnam

Loan Bui Thi Thu, Thang Nguyen Xuan, Hao Vu Duy, Hieu Ta Quang

Annals of Computer Science and Information Systems

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2021

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Vol. 28

213--215

EN

The paper studies the factors affecting the business performance of commercial banks (2008-2018), based on the examination of bank characteristics according to the information on the financial statements of 24 commercial banks and macroeconomic factors. Our findings provide evidence on the significant influence of the factors of diversity on income structure, cost management and capital structure on the business performance of commercial banks. Some implications and future research directions are thereby proposed.

14

Explosive Valencia – futuristic imagination and the power of tradition in creating the image of urban spaces. Competition and conflict, or coexistence and praise of diversity?

Kaczmarska Elżbieta

Technical Transactions

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2020

|

Vol. 117, iss. 1

art. no. e2020007

EN

Selected districts of Valencia and the gradual transformation of their image are presented in this article. The formulation of an appropriate strategy of action and the effect of an example that were initiated by the construction of the City of Arts and Sciences have broken through the stagnation in thinking about space. Revitalisation efforts have been initiated in many of the city’s districts, as well as in its suburban zone. The great explosion of ideas and emotions also carried over to enhancing the historical traditions of the city and the holistic, multi-directional approach to the subject matter of renewal, providing the city with economic stimulation. The author’s own analyses presented in the article pertain to: Ciudad de las Artes y las Ciencias (City of Arts and Sciences), the new development of the Poblats Maritims coastal district, the Ciutat Fallera district and the Orba district of the town of Alfafar, located in Valencia’s metropolitan area. Various proposals for transforming the spatial structure of these districts point to the possibility of conducting an experimental hybrid policy intended to reconcile economic rescaling, entrepreneurship and cultural regionalism in the planned landscape.

PL

W artykule zaprezentowano wybrane dzielnice Walencji i stopniową przemianę ich obrazu. Budowa właściwej strategii działań i efekt przykładu zapoczątkowane przez realizację Miasta Sztuki i Nauki przełamały marazm w myśleniu o przestrzeni. Podjęto prace rewitalizacyjne w wielu dzielnicach miasta i jego strefie podmiejskiej. Wielki wybuch pomysłów i emocji przełożył się również na utrwalenie historycznych tradycji miasta i całościowe wielokierunkowe podejście do problematyki odnowy, co przyniosło miastu ożywienie gospodarcze. Własne analizy przedstawione w artykule dotyczyły kolejno: Ciudad de las Artes y las Ciencias (Miasta Sztuki i Nauki), nowej zabudowy dzielnicy nadmorskiej Poblats Maritims, dzielnicy Ciutat Fallera oraz dzielnicy Orba miasteczka Alfafar położonego w strefie metropolitarnej Walencji. Różnorodne pomysły przekształcenia struktury przestrzennej wymienionych dzielnic wskazują na możliwość prowadzenia eksperymentalnej hybrydowej polityki w celu pogodzenia przeskalowania gospodarczego, przedsiębiorczości i regionalizmu kulturowego w planowanym krajobrazie i przez niego.

15

Wybuchowa Walencja. Futurystyczna wyobraźnia i siła tradycji w kreowaniu obrazu przestrzeni miejskich. Konkurencja i konflikt czy współistnienie i pochwała różnorodności?

Kaczmarska Elżbieta

PUA Przestrzeń Urbanistyka Architektura

|

2020

|

Vol. 2

73--92

PL

W artykule zaprezentowano wybrane dzielnice Walencji i stopniową przemianę ich obrazu. Budowa właściwej strategii działań i efekt przykładu zapoczątkowane przez realizację Miasta Sztuk i Nauk przełamały marazm w myśleniu o przestrzeni. Podjęto prace rewitalizacyjne w wielu dzielnicach miasta i jego strefie podmiejskiej. Wielki wybuch pomysłów i emocji przełożył się również na utrwalenie historycznych tradycji miasta i całościowe wielokierunkowe podejście do problematyki odnowy, co przyniosło miastu ożywienie gospodarcze. Własne analizy przedstawione w artykule dotyczyły kolejno: Ciudad de las Artes y las Ciencias (Miasta Sztuk i Nauk1), nowej zabudowy dzielnicy nadmorskiej Poblats Marítims, dzielnicy Ciutat Fallera oraz dzielnicy Orba miasteczka Alfafar położonego w strefie metropolitarnej Walencji.

EN

This article presents selected districts of Valencia and the gradual transformation of their image. The formulation of an appropriate strategy of action and the effect of an example that were initiated by the construction of the City of Arts and Sciences have broken through the stagnation in thinking about space. Revitalisation efforts have been initiated in many of the city’s districts, as well as in its suburban zone. The great explosion of ideas and emotions also carried over to expanding the historical traditions of the city and the holistic, multi-directional approach to the subject matter of renewal, providing the city with economic stimulation. The author’s own analyses presented in the article pertain to Ciudad de las Artes y las Ciencias (City of Arts and Sciences), the new development of the Poblats Marítims coastal district, the Ciutat Fallera district and the Orba district of the town of Alfafar, located in Valencia’s metropolitan area. Various proposals for transforming the spatial structure of these districts point to the possibility of conducting an experimental hybrid policy intended to reconcile economic rescaling, entrepreneurship and cultural regionalism in the planned landscape.

16

Contemporary principles of urban design of metropolis. Scale of planned development units and diversity

Guranowska-Gruszecka Krystyna

Przestrzeń i Forma

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2020

|

nr 44

211--230

EN

The aim of the article is to draw readers' attention to radical changes that occur in the contemporary life of the developing civilization, which entails the necessity to adapt to these changes. Accommodating to these changes is not always successful, whereas in Poland the process usually takes place with a delay of about 50 years, compared to Western Europe. In the field of architecture and urban planning, it is necessary to pay attention to the distribution of places of residence in relation to the location of workplaces and leisure facilities in rapidly growing metropolises.

PL

Przedmiotem artykułu jest zwrócenie uwagi czytelników na diametralne zmiany, jakie następują w naszym współczesnym życiu rozwijającej się cywilizacji, co pociąga za sobą konieczność dostosowania się do nich, a nie zawsze to następuje, w Polsce zwykle z opóźnieniem o około 50 lat w stosunku do Europy Zachodniej. W dziedzinie architektury i urbanistyki dotyczy to przede wszystkim rozmieszczenia miejsc zamieszkania w stosunku do lokalizacji miejsc pracy i odpoczynku w rozrastających się gwałtownie metropoliach.

17

Dominant species drive seasonal dynamics of the fish community in the Min estuary, China

Li Jun, Kang Bin

Oceanological and Hydrobiological Studies

|

2020

|

Vol. 49, No. 1

34--48

EN

Fishery resources are currently facing multiple stresses such as overfishing, pollution and climate change. Looking into processes and mechanisms of the dynamic fish community through detailed quantitative analyses contributes to effective conservation and management of fishery resources. The Min estuary plays an important role in maintaining fisheries in southeastern coastal China, therefore the fish community in the brackish area was investigated and analyzed in this study. A total of 127 species belonging to 91 genera, 49 families and 14 orders were sampled in 2015. Eight indices reflecting four aspects of fish communities were determined, i.e. species richness, species evenness, heterogeneity and taxonomy. Differences between the indices were nonsignificant, suggesting that the use of a single diversity descriptor could not provide a full explanation. Nine dominant species in the Min estuary showed seasonal turnover by rational use of resources and co-occurring species showed correspondingly adequate habitat preferences and feeding habits to avoid competition. The species Harpadon nehereus occurred as the dominant species in three seasons except spring. High values of niche overlap among common or rare species and lower values of niche overlap among all dominant species effectively brought the diversity of the fish community into a state of equilibrium.

18

Diatoms (Bacillariophyta) from the Genus Eunotia and Pinnularia Developing on Soils in the Open Landscape of the Low Beskids

Poradowska Anita

Journal of Ecological Engineering

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2020

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Vol. 21, nr 7

257--270

EN

In the areas of medium mountains, including the landscape of the Low Beskids, turf communities guarantee the biodiversity increasing the value of open landscape and protecting soil from erosion. The aim of this study was to show the diversity of the diatom communities from the Eunotia and Pinnularia genera developing on soils under the conditions of varied landscape use (meadows, pastures, fallow lands). The research was carried out within the catchment area of the Ryjak stream in the Magura National Park, together with the buffer zone at three sites. The water content varied in the studied soils with fluctuating moisture content depending on the season and the research year. On the other hand, the pH values indicated high acidification of the studied soils. The diatomaceous analysis showed numerous occurrences of the Eunotia (12 taxa) and Pinnularia (18 taxa) genera. The acid pH of the soil undoubtedly favored the development of diatoms of these genera. Most species of the Eunotia and Pinnularia genera usually developed individually, except for Pinnularia borealis Ehrenberg and P. obscura Krasske. They are typically soil species; therefore, they often dominated in the material and occurred in most of the research seasons. Apart from cosmopolitan diatoms, rare or endangered taxa from the Red List of the algae in Poland (Siemińska et al. 2006) were also found on soils. Four species belonged to the endangered category (E): Eunotia botuliformis F. Wild, Nörpel & Lange-Bert., Pinnularia nodosa (Ehrenberg) Smith, P. schoenfelderi and P. viridiformis Krammer. Canonical analysis (CCA) demonstrated a rather low statistical significance of the impact of environmental parameters (pH and humidity) on the differentiation of diatom communities. It only confirmed the fact that diatoms develop better in the environment with permanent or at least periodic moisture, compared to the dry habitats.

19

Ultradiversities and their spherical completeness

Mehrabani Gholamreza H., Nourouzi Kourosh

Journal of Applied Analysis

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2020

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Vol. 26, nr 2

231--240

EN

Diversities are a generalization of metric spaces which associate a positive real number to every finite subset of the space. In this paper, we introduce ultradiversities which are themselves simultaneously diversities and a sort of generalization of ultrametric spaces. We also give the notion of spherical completeness for ultradiversities based on the balls defined in such spaces. In particular, with the help of nonexpansive mappings defined between ultradiversities, we show that an ultradiversity is spherically complete if and only if it is injective.

20

Efects of anisotropic changes on the conductivity of sedimentary aquifers, southeastern Niger Delta, Nigeria

George N. J., Bassey N. E., Ekanem A. M., Thomas J. E.

Acta Geophysica

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2020

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Vol. 68, no. 6

1833--1843

EN

Sundry soils/rocks are characterized by electrical properties with clearly or obscurely expressed anisotropies. These anisotropic efects may be low, moderate or high depending on the coefcient of anisotropy (λ). The vertical electrical sounding technique employing Schlumberger electrode confguration and lithological information from boreholes were deployed to characterize the lithological diversity in homogeneous and anisotropic geologic units that serve as aquifer systems and their overlaying layers in the coastal region of Akwa Ibom State. Based on the λ, the assessed volume of sedimentary formation is classifed into low anisotropy λ<1.2 , moderate anisotropy (1.2 < λ ≤ 1.3) and high anisotropy (λ > 1.3) with alluvium (64.3%), inter-bedded shale and sandstone (14.3%) and shale and slate (21.3%). The estimated percentage of respective compositional coverage indicates that alluvium is dominant, while the blended inter-bedded shale and sandstone as well as the shale and slate are minor geologic units in the Benin Formation. Inferred index of spread of alluvium indicates that the homogeneous and anisotropic units assessed are intrinsic/microscopic in nature as identifed by the impressed current that passed through geologic system. The results showcased that the plot between the strike-dependent resistivity ( ρθ ) at arbitrary chosen strike and geometric mean resistivity ( ρm ) can be used as a yardstick for inferring the degree of consistency of geologic compositions in homogeneous and anisotropic media. Both the quantitative (graphic) and qualitative (contour) results portend the thin possibility of having anisotropy free geologic units. The finding proposes that ground resistivity measurements and interpretations of geologic structures should be constrained by borehole information in order to frm up the intended plans for obtaining clearer, defendable and well-resolved subsurface structures.