Wyniki wyszukiwania - BazTech

1

Non-indigenous tanaid Sinelobus vanhaareni Bamber, 2014 in the Polish coastal waters : an example of a successful invader

Brzana Radosław, Marszewska Lena, Normant-Saremba Monika, Błażewicz Magdalena

Oceanological and Hydrobiological Studies

|

2019

|

Vol. 48, No. 1

76--84

EN

The paper reports on the first record of Sinelobus vanhaareni, a non-native tanaid, in the Polish coastal waters (Gulf of Gdansk, southern Baltic Sea). The species was found in the port of Gdynia in 2014, while in 2015–2017 it already colonized the western part of the Gulf of Gdansk, inhabiting mainly hard substrates, including both natural (e.g. boulders) and anthropogenic ones (e.g. vertical concrete piles or walls of offshore structures and breakwaters, horizontal PVC plates and oyster shells used as filling in habitat collectors). During the survey period, S. vanhaareni was found in different seasons of the year (from winter and early spring to autumn), which, combined with the presence of ovigerous females as well as high abundance (up to tens of thousands of individuals per square meter), allows us to assume that the species has already established a population in the Gulf of Gdansk.

2

First records of two planktonic Indo-Pacific diatoms : Chaetoceros bacteriastroides and C. pseudosymmetricus in the Adriatic Sea

Čalić M., Ljubimir S., Bosak S., Car A.

Oceanologia

|

2018

|

No. 60 (1)

101--105

EN

Unusual occurrence of planktonic diatom species, Chaetoceros bacteriastroides and Chaetoceros pseudosymmetricus, was noticed in three different marine ecosystems of Adriatic Sea: the Krka Estuary and Telaščica Bay in the Central Adriatic, and in southern Adriatic offshore. From 2010 to 2015, these two Chaetoceros species were recorded in heterogeneous environmental conditions and in a very low abundances. Both species are regarded as very rare in world oceans, and consequently knowledge of their distribution and ecology is rather poor. Primarily described from tropical waters and showing Indo-Pacific distribution, C. bacteriastroides and C. pseudosymmetricus findings in Adriatic represent the northernmost records in world's oceans and seas. For C. pseudosymmetricus this is also the first occurrence in European seas. Areal expansion and introduction of new phytoplankton species in the Adriatic Sea might be related to different circulation regimes in the Ionian Sea and the concurrent rise in sea temperature in the Mediterranean in the last decade. Recent investigations have shown that entering currents, of either Atlantic/Western Mediterranean or Eastern Mediterranean origin, modify the composition of the plankton community in the Adriatic by bringing different newcomers.

3

First record of the North American amphipod Melita nitida Smith, 1873 in Polish coastal waters

Normant-Saremba M., Marszewska L., Kerckhof F.

Oceanological and Hydrobiological Studies

|

2017

|

Vol. 46, No. 1

108--115

EN

The present paper reports the first observation of the North American amphipod Melita nitida Smith, 1873 in the Gulf of Gdańsk (the southern Baltic Sea, Poland). In 2014, 13 adult specimens, including 3 males, were collected in the Port of Gdynia, which is located in the western part of this waterbody.

4

How old polar expeditions distributed species in the Pacific basin

Rakusa-Suszczewski S.

Polish Journal of Ecology

|

2012

|

Vol. 60, nr 4

855--857

EN

Introductions of new species by polar expeditions to Antarctica, and to the Arctic, had started by the turn of 19th century, with old polar expedition of Cook, Lisianskij, Bellingshausen, Kotzebue. Place and species were listed.

5

The ecological profit in phenology and pollination of alien species Spartina alterniflora (Loisel) introduced to coastal wetlands in northern China

Shi F., Yuan Z., He K., Li J., Guo S.

Polish Journal of Ecology

|

2009

|

Vol. 57, nr 2

283-289

EN

For the plant species, effective phenology and pollination syndromes can increase viable seeds which enhance the species to colonize new areas. So the species with a suit of advantageous characteristics inherent in its reproductive ecology is critical to its dispersion. Spartina alterniflora - a perennial grass native to coastal marshes of America was introduced to China in 1979 and now it is distributed in the Tianjin coastal wetlands of northern China. Flowering phenology was examined and indicated that in northern localities, flowering initiated in mid-August and senescence occurred by the end of October. The pollen-ovule ratio was 9875 ([plus or minus]2150). Abundant pollen grains compensated for a lack of pollen viability. Pollen viability was 10% approximately when pollen released 4 hours, but stigma receptivity was above 10% when stigmas exserted 7 hours. Stigmas maintained viability longer than the period of pollen release, ensuring successful pollination. Scanning electron microscopy was used to observe stigma surface characters and pollen viability. Further investigation proved stigma adaptations to increase pollen capture and exterior pollen tube growth following pollination was beneficial to fertilization. The results suggested that flowering phenology and pollination traits are vital to pollination and production of viable seed, enabling the species to spread rapidly and succeed in new habitats of northern China.

6

Impact of invasive benthic crustaceans on the resuspension of bottom sediments : an experimental study

Zaiko A., Olenin S.

Oceanological and Hydrobiological Studies

|

2004

|

Vol. 33, No. 3

99--110

EN

The resuspension process caused by the burrowing activity of three Ponto-Caspian amphipod species (Pontogammarus robustoides, P. crassus and Chaetogammarus ischus) introduced to the Curonian Lagoon, Baltic Sea, was studied in a laboratory. The experimental set-up included aquaria with three types of bottom sediments: 1) sand; 2) sand with pebbles; 3) sand with stones up to 30 cm in diameter. The experimental aquaria contained amphipods in numbers that mimicked their density in situ, while control aquaria contained no animals. Water was sampled from three different layers (1, 5, and 9 cm above the sediment surface) from experimental and control aquaria and analyzed with a spectrophotometer at a wavelength of 660 nm in order to estimate the density of suspended material. The burrowing activity of the amphipods in all sediment types increased the amount of suspended material throughout the studied water layer (10 cm). The most visible effect was detected above the sandy bottom with large stones, the least – above the sandypebble bottom. The conclusion was drawn that the invasive burrowing amphipods can increase the resuspension of bottom sediments in invaded ecosystems.