Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Biological research of Grabia River - fifty years of activity

100%

Siciński J. , Tończyk G. , University of Łódź D. o. I. Z. a. H.

tom 2

Grabia, a small still close to natural conditions lowland river, has been an object of special interest for Łódź hydrobiologists for more than 50 years. Over 100 scientific papers and over 100 master theses were produced in the Faculty of Biology and Environmental Protection University of Łódź. The initiator was Prof.L.K. Pawłowski who spent many years conducting research into the river. The ground and the first research objective was to recognize the fauna diversity. The checklist encompass almost 1000 invertebrate and 24 fish species. Taxonomy, biology and ecology of various taxa have made for many decades an essential trend of scientific activity. Special attention was dedicated to rotifers, leeches, branchiobdellids, snails and bivalves, gammarids and copepods as well as aquatic insects, fish and also diatoms. Some aspects of zoobenthos and Zooplankton communities ecology was the subject of 13 Ph.D.theses. The river with its rich animal and plant communities was also the subject of dynamics of river ecosystem research. The study on the structure of invertebrate assemblages on the background of habitat diversity has been recently conducted. The model may be treealed as a reference to the restoration of Europaean rivers and their valleys.

Natural and anthropogenic factors influencing abundance of the benthic macrofauna along the shelf and slope of the Gulf of Guinea, a large marine ecosystem off West Africa

70%

Pabis K. , Sobczyk R. , Siciński J. , Ensrud T. , Serigstadt B.

Oceanologia

2020

tom No. 62 (1)

83--100

The West African continental margin belongs to the least known areas in terms of the ecology of benthic ecosystems. At the same time, this region is influenced by various threats associated with human activities, including industrialisation and oil excavation. Here, we analyse the abundance and distribution patterns of macrozoobenthic communities along the coast of Ghana. The material was collected in 2012 on nine transects at depths ranging from 25 to 1000 m. Over 200 quantitative samples were collected using a 0.1-m2 van Veen grab. Generally, the mean density of macrozoobenthos decreased gradually from the shallow zone (25 m: 231.4 ± 262.2 ind./0.1 m2) down to bathyal depths (1000 m: 55.4 ± 51.4 ind./0.1 m2), but we observed intermediate scale variability in distribution patterns among the transects along the Ghanaian coast. Analysis of environmental factors showed no evidence of substantial pollution, although levels of hydrocarbons, barium and some other toxic metals show some local increases at particular stations, especially on the continental slope. Cluster analysis based on Bray-Curtis similarity and abundance of higher taxonomic groups of macrofauna yielded five groups of stations, while SIMPER analysis demonstrated that polychaetes and amphipods contributed most significantly to within-group similarity. Canonical Correspondence Analysis demonstrated that PAH, THC and toxic metal levels (Ba, Cd, Pb), as well as oxygen concentration, were the most important factors structuring benthic communities.