Importance of tintinnids and Mesodinium rubrum in communities of planktonic ciliates in the shallow brackish lakes Gardno and Lebsko (northern Poland)

• Autorzy: Rychert K. , Myszka M. , Wielgat-Rychert M. , Skuza E.

Warianty tytułu

PL

Znaczenie tintinnid i Mesodinium rubrum w zbiorowiskach planktonowych orzęsków w płytkich i słonawych jeziorach Gardno i Lebsko (północna Polska)

• Języki publikacji: EN

Abstrakty

EN

Ciliates constitute an important trophic link in aquatic environments, because they are essential food sources for zooplankton and fish. In this study, the spatial differences in abundance and composition of ciliate communities in relation to varying water salinity were investigated. The study was conducted in the large, brackish, eutrophic lakes Gardno and Łebsko. In the studied lakes, no significant differences among ciliate communities were identified among sampling sites. Ciliate communities in Lake Łebsko were characterized by a high contribution of tintinnids, with mean values at particular sites between 32% and 36%. In Lake Gardno, where salinity was lower, the importance of tintinnid ciliates increased after a marine water intrusion into the lake. In both lakes, the importance of tintinnids in ciliate communities was higher than in adjacent fresh and marine waters. Shortly after wind-driven intrusions of marine waters (backwaters), the marine and brackish mixotrophic ciliate Mesodinium rubrum was observed in both lakes. Once, in the eastern part of Lake Łebsko, Mesodinium major (= Mesodinium rubrum forma major) was observed after a strong backwater when salinity reached 5.4 PSU.

PL

Orzęski stanowią istotne ogniwo troficzne w środowisku wodnym, ponieważ są ważnym źródłem pokarmu dla zooplanktonu i ryb. W prezentowanej pracy zbadano wpływ gradientu zasolenia na liczebność i skład zbiorowisk orzęsków. Badania prowadzono w dużych słonawych i eutroficznych jeziorach Gardno i Łebsko. Pomimo zróżnicowania przestrzennego zasolenia wody, nie wykazano istotnych różnic pomiędzy zbiorowiskami orzęsków obserwowanymi na poszczególnych stanowiskach. Zbiorowiska orzęsków w jeziorze Łebsko charakteryzowały się wysokim udziałem tintinnid, które wnosiły średnio na poszczególnych stacjach od 32% do 36% liczebności. W jeziorze Gardno, w którym zasolenie było niższe, znaczenie tintinnid wzrosło po intruzji wód morskich do jeziora. W obu badanych jeziorach znaczenie tintinnid w zbiorowiskach orzęsków było wyższe niż w przyległych wodach słodkich i morskich. Krótko po spowodowanych wiatrem intruzjach wody morskiej (cofkach) w obu jeziorach był obserwowany słono- i słonawowodny miksotroficzny orzęsek Mesodinium rubrum. Po silnej cofce, kiedy zasolenie we wschodniej części jeziora Łebsko sięgnęło 5,4 PSU, zaobserwowano tam Mesodinium major (= Mesodinium rubrum forma major).

Słowa kluczowe

EN

tintinnid; Mesodinium rubrum; protozoa; protist; Myrionecta rubra; Mesodinium major; distribution; salinity; eutrophic lake; planktonic ciliate; shallow lake; brackish lake; Lake Gardno; Lake Lebsko; Poland

• Wydawca: -
• Czasopismo: Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
• Rocznik: 2017
• Tom: 21
• Opis fizyczny: p.233-244,

Twórcy

autor

Rychert K.

• Department of Ecology, Institute of Biology and Environmental Protection, Pomeranian University in Slupsk, Arciszewskiego 22b, 76-200 Slupsk, Poland

autor

Myszka M.

• Department of Ecology, Institute of Biology and Environmental Protection, Pomeranian University in Slupsk, Arciszewskiego 22b, 76-200 Slupsk, Poland

autor

Wielgat-Rychert M.

• Department of Ecology, Institute of Biology and Environmental Protection, Pomeranian University in Slupsk, Arciszewskiego 22b, 76-200 Slupsk, Poland

autor

Skuza E.

• Department of Ecology, Institute of Biology and Environmental Protection, Pomeranian University in Slupsk, Arciszewskiego 22b, 76-200 Slupsk, Poland

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