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ON REGIONAL ASPECTS OF VERTICAL DISTRIBUTION OF MONTENEGRIN POPULATION

100%

Lješević M., Doderović M.

Quaestiones Geographicae

2020

vol. 39

issue 1

The coordinates of 18°26' and 19°22' east latitude and 41°52' and 43°32' north longitude set geographic position of Montenegro. The total length of its land borders is 614 km. The border alongside Croatia is 14 km long, alongside Bosnia and Herzegovina 225 km, alongside Serbia 20 km, and alongside Albania 172 km of the state border (partly across the Scadar lake and alongside the river Bojana). There is a 100 km of air distance between the furthest points at the sea. The factual length of the Montenegrin coast is about 280 km, which makes the serrated coefficient of 2.8. Montenegro is in proportion to its territory and population the smallest of all ex-Yugoslav republics. It spreads over the area of 13,812 square kilometres which makes 5.4% of ex-Yugoslav territory. According to 2003 census, 620.145 citizens lived in 1240 settlements, which were 45 citizens on a square kilometre. Out of 21 municipalities six are in the coastal region. The largest municipality in Montenegro (as well as in both ex-Yugoslavia and in the State union of Serbia and Montenegro) is Nikšić with 2,065 square kilometres, and the smallest is Tivat with 46 square kilometres. The capital of Montenegro is Podgorica with population of 96,076.

Pionowe rozmieszczenie fitoplanktonu w dwóch jeziorach mezotroficznych

72%

Solis M., Wojciechowska W., Lenard T.

Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia

2013

vol. 68

issue 2

In lakes Rogóźno and Zagłębocze located in the Łęczna-Włodawa Plain (E Poland), monthly and daily changes in the vertical distribution of phytoplankton biomass were investigated. In both lakes, phytoplankton biomass in metalimnion were two or three times higher than in epilimnion. In Rogóźno Lake, Planktothrix rubescens dominated in phytoplankton (> 80% of biomass), whereas in Zagłębocze Lake − Ceratium hirundinella prevailed (> 90% of biomass). The biomass maxima of Pl. rubescens (at 6 m depth – 43.5 mg dm-3 and at 7 m depth - 24.4 mg dm-3) were always below the lower limit of the euphotic zone, i.e. at the depth where the light was < 1%, and the water temperature was < 10 °C. Large biomass of C. hirundinella was observed always in metalimnion (up to 43.6 mg dm-3 in July) at the lower limit of the euphotic zone (transparency of Sd = 3.0 m). In August, when transparency of Sd = 2.5 m, biomass of C. hirundinella varied significantly during the day in the two thermal layers. In epilimnion, the largest increase of biomass was observed in daylight hours and the decrease at night. The reverse situation was observed in metalimnion − the decline in the daytime and the increase at night. The studies revealed that despite different mechanisms of motility (buoyancy or flagellar movement), vertical migrations of these species corresponded mainly to the changing light.

jeziorach Rogóźno i Zagłębocze położonych na Równinie Łęczyńsko-Włodawskiej (wsch. Polska) badano zmiany biomasy fitoplanktonu w pionowym rozmieszczeniu w skali miesięcznej i dobowej. W obu jeziorach biomasa fitoplanktonu w metalimnionie była dwa lub trzy razy wyższa niż w epilimnionie. W jeziorze Rogóźno w fitoplanktonie dominowała Planktothrix rubescens(> 80% biomasy), natomiast w jeziorze Zagłębocze – Ceratium hirundinella (> 90% biomasy). Maksima biomasy Pl. rubescens (na 6 m – 43,5 mg dm-3 i na 7 m – 24,4 mg dm-3) zawsze występowały poniżej dolnej granicy strefy eufotycznej, czyli na głębokości, gdzie światło było <1%, a temperatura wody wynosiła <10 ° C. Duża biomasa C. hirundinella występowała zawsze w metalimnionie (aż do 43.6 mg dm-3 w lipcu) przy dolnej granicy strefy eufotycznej (widziałność Sd = 3,0 m). W sierpniu, gdy widzialność krążka Sd = 2,5 m, biomasa C. hirundinella różniła się znacząco w ciągu doby w dwóch warstwach termicznych. W epilimnionie największy przyrost biomasy odnotowano w ciągu dnia, a spadek w nocy. Odwrotna sytuacja miała miejsce w metalimnionie – spadek w ciągu dnia i wzrost w nocy. Badania wykazały, że pomimo różnych mechanizmów ruchliwości (pławność lub aparat wiciowy), pionowe migracje tych gatunków związane były głównie ze zmieniającymi się warunkami świetlnymi.

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1 Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia

1 Quaestiones Geographicae

1 2020

1 2013

1 Doderović M.

1 Lenard T.

1 Lješević M.

1 Solis M.

1 Wojciechowska W.

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ON REGIONAL ASPECTS OF VERTICAL DISTRIBUTION OF MONTENEGRIN POPULATION

Pionowe rozmieszczenie fitoplanktonu w dwóch jeziorach mezotroficznych