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Journal Details
Format
Journal
eISSN
2300-7575
ISSN
1642-5952
First Published
17 Mar 2011
Publication timeframe
4 times per year
Languages
English

Search

Volume 11 (2011): Issue 4 (December 2011)

Journal Details
Format
Journal
eISSN
2300-7575
ISSN
1642-5952
First Published
17 Mar 2011
Publication timeframe
4 times per year
Languages
English

Search

4 Articles
Open Access

Relationship between areal hypolimnetic oxygen depletion rate and the trophic state of five lakes in northern Poland

Published Online: 07 Feb 2012
Page range: 135 - 142

Abstract

Relationship between areal hypolimnetic oxygen depletion rate and the trophic state of five lakes in northern Poland

The oxygen content in a lake is a fundamental factor in lake ecology. In stratified lakes, deep waters are isolated from the atmosphere for several months during the summer; therefore, oxygen (substantially consumed by biological and chemical processes at this time) cannot be replaced before the autumnal mixing period. Hypolimnetic oxygen depletion has been considered an indicator of lake productivity since the early twentieth century. Many recent studies have been in opposition to this view by showing that the areal hypolimnetic oxygen depletion rate (AHOD) is poorly correlated with seston biomass and/or phosphorus concentration. The objective of this study is to show relationships between the mean values of total phosphorus (TP), total nitrogen (TN), chlorophyll a, and water transparency (Secchi disk depth, SDD) during the thermal stratification formation period and the AHOD rate. Hypolimnetic oxygen conditions in five dimictic lakes in northern Poland were examined in 2009 and 2010. Two of them were studied in the previous year. Monthly oxygen profiles taken from April to August, midsummer temperature profiles, and morphological data of the lakes were used to determine the AHOD rate. Standard water quality parameters such as concentrations of chlorophyll a, TP, and TN, as well as water transparency measured at the same time were used to calculate the trophic state indices (TSI) according to the Carlson-type formulas. On the basis of the collected data it is shown that AHOD is highly correlated with the TSI value for chlorophyll a, and poorly correlated with the TSI values for water transparency and phosphorus content. The best correlation between AHOD and TSI has been found for chlorophyll a (r2=0.702; p<0.001), as well as for overall TSI, determined by averaging separate component indices (r2=0.826; p<0.000). No correlation was found between AHOD and total nitrogen concentration. The research also confirmed previous observations, which pointed to a significant role of the hypolimnion depth in increasing oxygen deficits.

Keywords

  • water quality
  • eutrophication
  • lake ecology
  • oxygen consumption
  • summer stagnation
Open Access

Lakes in the cascade model of storage and drainage reservoirs

Published Online: 07 Feb 2012
Page range: 143 - 150

Abstract

Lakes in the cascade model of storage and drainage reservoirs

The study area covers a compact, decentric hydrographic system called the Kashubian hydrographic system, which includes the drainage basins of the Słupia, Łupawa, Łeba, Reda, Wda, Wierzyca and Radunia. The Kashubian hydrographic system can be presented in the form of a cascade model of storage-drainage reservoirs - kord. One of the properties of a hydrographic system is its extent. Its horizontal extent is delimited by topographic watersheds, and its vertical extent is delimited at the bottom by the surface of the drainage base and in the roof by the land surface. Since reservoirs of the kord model are inscribed one into another, the upper border of all the reservoirs of the cascade is assumed to be the land surface, and the lower border of particular reservoirs of the cascade is a surface going through the level (elevation) of recipients receiving their waters. In the kord model on all its levels there are water reservoirs; however they differ in terms of origin, development, hydrological features and the role they play in the system. Depending on the type of recipient, drainage and storage can occur with various intensity. As follows from the hydrographic analysis the deepest lakes are situated in local and regional recipients, hence in these types of recipient, drainage and storage have greater intensity. On the other hand, in the transit recipient, transport is dominant.

Keywords

  • young glacial areas
  • recipient
  • reservoir
  • kord model
Open Access

Shoreline and surface area changes induced by floating islands in peatland lakes (Tuchola Pinewood Forest, Poland)

Published Online: 07 Feb 2012
Page range: 151 - 162

Abstract

Shoreline and surface area changes induced by floating islands in peatland lakes (Tuchola Pinewood Forest, Poland)

Multitemporal aerial photography and topographic maps were applied to investigate shoreline and surface area changes induced by floating islands in three small (area < 1 ha) peatland lakes in the Tuchola Forest. The observation period covers the last 60 years (1951-2011). Shorelines of peatland lakes are stable, unless parts of them detach as floating mats and become floating islands which could have migrated sporadically in the past. Currently, they are rooted permanently to the mat (Dury I and Dury V Lakes) or float loose (Kozie Lake). In the observation period, movement of the islands and closing of lake bays due to overgrowing were the main reasons of shoreline changes. Due to low resolution of old aerial photographs, other changes are not decipherable and can be treated as negligible. Therefore, no reasonable conclusions can be drawn regarding the actual floating mat encroachment during the last 60 years, and the rate of lake shrinking, based of aerial photographs.

Keywords

  • peatland lake
  • floating mat
  • floating island
  • lake shoreline changes
  • lake shrinking
  • Tuchola Forest
Open Access

Development of floating-leaved vegetation in three lakes of varied trophy (Leczna-Wlodawa Lakeland)

Published Online: 07 Feb 2012
Page range: 163 - 169

Abstract

Development of floating-leaved vegetation in three lakes of varied trophy (Leczna-Wlodawa Lakeland)

Nymphaeids are a typical component of littoral vegetation in European lakes. In different types of water bodies they create large stands. This group of macrophyte species grows not deeper than 3 metres, but depending on clarity and depth. The aim of this study was to determine the percentage share and biomass of nymphaeids in investigated lakes with varying trophy and way of use. Furthermore, another aim of the study was a comparative analysis of morphometric features among dominant species of nymphaeids. The studied lakes are a group of eutrophic lakes, in various stages of its advancement from the low eutrophic Lake Płotycze Sobiborskie, through the eutrophic Lake Płotycze Urszulińskie to the highly eutrophic Lake Zienkowskie. In the studied lakes, nymphaeids formed a large part of the phytolittoral as well as macrophyte biomass, the smallest in the strongly eutrophic lake, the largest in the eutrophic lake. In the studied lakes appeared both Nymphaea candida species as well as intermediate forms. Neither the use of the lake nor habitat conditions affected the differentiation of the analysed characteristics of Nuphar lutea, while the most sensitive species was Nymphaea candida.

Keywords

  • nymphaeids
  • macrophytes
  • morphometric features
4 Articles
Open Access

Relationship between areal hypolimnetic oxygen depletion rate and the trophic state of five lakes in northern Poland

Published Online: 07 Feb 2012
Page range: 135 - 142

Abstract

Relationship between areal hypolimnetic oxygen depletion rate and the trophic state of five lakes in northern Poland

The oxygen content in a lake is a fundamental factor in lake ecology. In stratified lakes, deep waters are isolated from the atmosphere for several months during the summer; therefore, oxygen (substantially consumed by biological and chemical processes at this time) cannot be replaced before the autumnal mixing period. Hypolimnetic oxygen depletion has been considered an indicator of lake productivity since the early twentieth century. Many recent studies have been in opposition to this view by showing that the areal hypolimnetic oxygen depletion rate (AHOD) is poorly correlated with seston biomass and/or phosphorus concentration. The objective of this study is to show relationships between the mean values of total phosphorus (TP), total nitrogen (TN), chlorophyll a, and water transparency (Secchi disk depth, SDD) during the thermal stratification formation period and the AHOD rate. Hypolimnetic oxygen conditions in five dimictic lakes in northern Poland were examined in 2009 and 2010. Two of them were studied in the previous year. Monthly oxygen profiles taken from April to August, midsummer temperature profiles, and morphological data of the lakes were used to determine the AHOD rate. Standard water quality parameters such as concentrations of chlorophyll a, TP, and TN, as well as water transparency measured at the same time were used to calculate the trophic state indices (TSI) according to the Carlson-type formulas. On the basis of the collected data it is shown that AHOD is highly correlated with the TSI value for chlorophyll a, and poorly correlated with the TSI values for water transparency and phosphorus content. The best correlation between AHOD and TSI has been found for chlorophyll a (r2=0.702; p<0.001), as well as for overall TSI, determined by averaging separate component indices (r2=0.826; p<0.000). No correlation was found between AHOD and total nitrogen concentration. The research also confirmed previous observations, which pointed to a significant role of the hypolimnion depth in increasing oxygen deficits.

Keywords

  • water quality
  • eutrophication
  • lake ecology
  • oxygen consumption
  • summer stagnation
Open Access

Lakes in the cascade model of storage and drainage reservoirs

Published Online: 07 Feb 2012
Page range: 143 - 150

Abstract

Lakes in the cascade model of storage and drainage reservoirs

The study area covers a compact, decentric hydrographic system called the Kashubian hydrographic system, which includes the drainage basins of the Słupia, Łupawa, Łeba, Reda, Wda, Wierzyca and Radunia. The Kashubian hydrographic system can be presented in the form of a cascade model of storage-drainage reservoirs - kord. One of the properties of a hydrographic system is its extent. Its horizontal extent is delimited by topographic watersheds, and its vertical extent is delimited at the bottom by the surface of the drainage base and in the roof by the land surface. Since reservoirs of the kord model are inscribed one into another, the upper border of all the reservoirs of the cascade is assumed to be the land surface, and the lower border of particular reservoirs of the cascade is a surface going through the level (elevation) of recipients receiving their waters. In the kord model on all its levels there are water reservoirs; however they differ in terms of origin, development, hydrological features and the role they play in the system. Depending on the type of recipient, drainage and storage can occur with various intensity. As follows from the hydrographic analysis the deepest lakes are situated in local and regional recipients, hence in these types of recipient, drainage and storage have greater intensity. On the other hand, in the transit recipient, transport is dominant.

Keywords

  • young glacial areas
  • recipient
  • reservoir
  • kord model
Open Access

Shoreline and surface area changes induced by floating islands in peatland lakes (Tuchola Pinewood Forest, Poland)

Published Online: 07 Feb 2012
Page range: 151 - 162

Abstract

Shoreline and surface area changes induced by floating islands in peatland lakes (Tuchola Pinewood Forest, Poland)

Multitemporal aerial photography and topographic maps were applied to investigate shoreline and surface area changes induced by floating islands in three small (area < 1 ha) peatland lakes in the Tuchola Forest. The observation period covers the last 60 years (1951-2011). Shorelines of peatland lakes are stable, unless parts of them detach as floating mats and become floating islands which could have migrated sporadically in the past. Currently, they are rooted permanently to the mat (Dury I and Dury V Lakes) or float loose (Kozie Lake). In the observation period, movement of the islands and closing of lake bays due to overgrowing were the main reasons of shoreline changes. Due to low resolution of old aerial photographs, other changes are not decipherable and can be treated as negligible. Therefore, no reasonable conclusions can be drawn regarding the actual floating mat encroachment during the last 60 years, and the rate of lake shrinking, based of aerial photographs.

Keywords

  • peatland lake
  • floating mat
  • floating island
  • lake shoreline changes
  • lake shrinking
  • Tuchola Forest
Open Access

Development of floating-leaved vegetation in three lakes of varied trophy (Leczna-Wlodawa Lakeland)

Published Online: 07 Feb 2012
Page range: 163 - 169

Abstract

Development of floating-leaved vegetation in three lakes of varied trophy (Leczna-Wlodawa Lakeland)

Nymphaeids are a typical component of littoral vegetation in European lakes. In different types of water bodies they create large stands. This group of macrophyte species grows not deeper than 3 metres, but depending on clarity and depth. The aim of this study was to determine the percentage share and biomass of nymphaeids in investigated lakes with varying trophy and way of use. Furthermore, another aim of the study was a comparative analysis of morphometric features among dominant species of nymphaeids. The studied lakes are a group of eutrophic lakes, in various stages of its advancement from the low eutrophic Lake Płotycze Sobiborskie, through the eutrophic Lake Płotycze Urszulińskie to the highly eutrophic Lake Zienkowskie. In the studied lakes, nymphaeids formed a large part of the phytolittoral as well as macrophyte biomass, the smallest in the strongly eutrophic lake, the largest in the eutrophic lake. In the studied lakes appeared both Nymphaea candida species as well as intermediate forms. Neither the use of the lake nor habitat conditions affected the differentiation of the analysed characteristics of Nuphar lutea, while the most sensitive species was Nymphaea candida.

Keywords

  • nymphaeids
  • macrophytes
  • morphometric features

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