Characteristics of macrozoobenthos lakes of the Barlinek- Gorzów Landscape Park (North-West Poland) on the basis of the European Union Water Framework Directive

Contamination of lake waters is one of the factors affecting the qualitative and quantitative development of benthic organisms. Aside from contamination, the abundance of macrozoobenthos is determined by other conditions, i.e. predation pressure, phytoplankton biomass, detritus biomass, as well as the accessibility and quality of water reservoir bottom. The Barlinek-Gorzów Landscape Park was established in October 1991. The BarlinekGorzów Landscape Park includes more than 55 000 ha of forests, lakes, fields, meadows, and is characterized by a great diversity of habitats and abundant life forms [46]. To protect the most valuable plant communities and animal habitats, five nature reserves were created within the boundaries of the Park: 1. “Skalisty Jar Libberta” includes Libbert’s Gorge, and the surrounding moraine hills and glacial erratics. It is the only site featuring lime stones and boulders in Western Pomerania and is surrounded by oak and beech forests [46]. 2. “Dębina” forest conservation complex known as the Central European wet-ground forest, featuring stately oaks and beeches with some lime, hornbeam and old pine trees. In its clean environment, as many as 50 species of arboreal lichen have been preserved [46]. “Markowe Błota” – marshland, with its typical vegetation such as the Sphagnopsida, wild rosemary, ordinary cranberry, cottongrass. The site is visited quite often by white-tailed eagles [46]. 3. The water reserve of the “River Przyłężek”. It includes a section of the River, the slopes of the riverbank and the surrounding beech stand with some tree specimens that are more than 100 years old. Seen as the watercourse resembles mountain streams, with its pure and cold water, it provides appropriate conditions for Salmonidae to live and spawn [46]. 4. The forest reserve “Wilanów” aims to protects the natural mixed forest with vintage beech, oak and pine trees. Thanks to the varied topography, diverse rare types of forests have been preserved here [46]. The objective of the research conducted in the course of 2008 – 2012 was to determine the qualitative and quantitative structure of macrozoobenthos in the lakes of the Barlinek-Gorzów Landscape Park in the summer season. The research enabled estimating how far the eutrophication processes have advanced in selected lakes of the Barlinek-Gorzów Landscape Park. Qualitative and quantitative analyses of the macrozoobenthos structure in the lakes BarlinekGorzów Landscape Park were conducted in the summer seasons of 2008, 2010 and 2012. By comparing the average density of benthic fauna of the lakes Barlinek-Gorzów Landscape Park with the lakes Western and Northern Polish you can see big changes in the density of taxa studied. International Letters of Natural Sciences Vol. 36 3


INTRODUCTION
Water has always been the foundation of human existence. Once man's survival depended on access to water, however, along with the development of civilization, human reliance on water changed. Humans started treating water as a common good, assuming its resources to be limitless. This line of thought has resulted in degradation of waters constituting a reserve of drinking water for future generations.
These alarming changes gave an impetus to taking suitable legal actions for the protection of water resources. The European Union issued a series of regulations, the so-called "water directives", yet it recognized the need for introducing a coherent framework regulating the acts of law aimed at conservation of water resources in all EU member states. Directive 2000/60/EC, the so-called Water Framework Directive (WFD), which entered into force in December 2000, constitutes such an integrated act of law. The main objective of the WFD is providing access to good quality water to present and future generations as well as enabling the use of water by, inter alia, industry and agriculture, while simultaneously preserving and conserving the natural environment.
With this in mind, it is an important issue to properly protect water reservoirs and also take action to counter the adverse effects of human activities on the natural environment, including water bodies.
To address the increasing degradation of surface waters in the European Union, the approach to the evaluation and protection of water resources was changed. This approach was formulated in the European Union Water Framework Directive (2000/60/EC), which calls for the protection of water, as well as an environment-friendly and comprehensive approach to water assessment. The ecological status of surface waters and groundwater is assessed on the basis of the ecological potential of the biological and physico-chemical and hydromorphological indicators [47][48][49][50][51][52].
The goal of the Water Framework Directive is to achieve good water status in all the Member States of the European Union.
There are five natural reserves within the Barlinek-Gorzów Landscape Park boundaries: a) the "Dębina" natural reserve (area: 12,18 ha) -a reserve with partial protection status.
Conservation of the central-Europe wet-ground forest for scientific and didactic purposes is the aim of the protection. One may encounter the following plants: oak forest with adition of beech, hornbeams, birches and old pines. Also 50 species of tree lichens have been found here, which means that the level of purity of the environment is exceptionally high here. The reserve is located on a slight elevation between a meadow and the picturesque Kłodawski Canal Valley [46]. b) the "Przyłężek River" natural reserve (area: 35,08 ha) -a reserve with partial protection status. Conservation for scientific and didactic purposes of a fragment of mixed forest of natural origin, with the addition of beech in the final position of the gregarious range with rich undergrowth is the aim of the protection. This is a fauna reserve. It was established on the basis of a fragment of the Przyłężek River, in the forest landscape, rimmed with beech forest stands which are over 100 years old. The clean waters of the river, the fact that they are overshadowed by the beech forest on the slopes and low temperature, create the proper conditions for spawning grounds of salmonidae, which include brown trout and bullhead. The area of the forest stands in the reserve amounts to 93.7%. In the north-west part of the reserve there is a spring which starts from the cave washed away by the water [46]. c) the "Wilanów" natural reserve (area: 67,16 ha) -a reserve with partial protection status. Conservation for scientific and didactic purposes of a fragment of mixed forest of natural origin with addition of beech at the final position of the gregarious range, with rich undergrowth is the aim of the protection. The reservation includes a fragment of natural beech and oak forest with the addition of pine and larch. Also individual beeches, oaks and pines which are 180-200 years old grow here, and they have natural monuments characteristics [46]. d) the "Skalisty Jar Libberta" natural reserve (area: 33,21 ha) -A reserve with partial protection status. Conservation of geological and scenic values of the only lime stones, conglomerates and boulders site in Westpomerania, which is part of a composition of an oak and beech forest community, exceptionally rich vascular vegetation and numerous species of mosses and ferns, is the aim of the protection. The reserve is located within ravines and gorges with considerable ground delevelling. The elevations are as high as 115 m above sea level and are covered with trees. There are numerous huge glacial erratics covered with moss and lichens. The area is adorned with about fifty ponds in various stages of overgrowth. The main value of this area is the moraine hills that form the valley edges which are cut across by numerous ravines and gorges. "Skalisty Jar Libberta" is one of them. Only in Westpomerania are there lime and sand stones which reach the height of up to 4 m [46]. e) the "Markowe Błota" natural reserve (area: 193,40 ha) -A reserve with partial protection status. Conservation for scientific, didactic and scenic purposes of the marshes with typical flora and fauna and also beech and mixed tree stands is the purpose of the protection. The protected complex is located in the Barlinek Forest. 30% of its area is covered with marshes surrounded by mixed and coniferous forests. One may observe 55 bird species here, including 42 breeding ones: white-tailed sea eagle, osprey, western marsh harrier and black stork. The marshes in the early spring and autumn period are an important stopping point on the bird-migration routes [46]. International Letters of Natural Sciences Vol. 36 9 In Table 1 presents data morphometric seven lakes Barlinek -Gorzów Landscape Park: Barlineckie, Suche, Lubiszewko, Przyłęg, Chłop, Lubie, Wielgie. Benthic material (sediments) along with benthic fauna was collected with Ekman-Brige grab sampler (surface of 225 cm 2 ). Following that, the type of sediment and depth of the bottom were determined (tab. 2,10,18,26,34,42,50). Benthic fauna Barlineckie Lake was collected during summer months from 6 sampling stations located in the littoral and profundal zone (altogether 12 samples). Benthic fauna lakes -Suche, Lubiszewko, Przyłęg, Chłop, Lubie, Wielgie was collected during two summer months from 4 sampling stations located in the littoral and profundal zone (altogether 8 samples). The location of research stations resulted from tributary positions and water reservoir morphometry. At each station 2 sub-samples were collected. The collected material was rinsed on a sieve with a mesh size of 0.5 mm and it was conserved in 4% formalin solution. Animals were segregated macroscopically and under a stereomicroscope (PZO make) into individual taxa, and their concentration was referenced to 1 m 2 of the surface of the lake bottom. Benthic fauna taxa collected from individual stations were weighted with an accuracy of 0.01 g after having been dried on filter paper. Fauna biomass was presented in grams of wet mass per 1 m 2 of the bottom [34,35,57,68,71,72]. Frequencies (F) were calculated from the following formula:

F= ·100%
where: n -number of stations where a given taxon occurred, N -number of research stations.

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Dominance index (D) was calculated from the following formula: where S(a) is a sum of individuals belonging to taxon "a", while S -is a total biomass of individuals of macrozoobenthos in all samples. The dominance index and frequency values were interpreted in accordance with the criteria specified by Kasprzak and Niedbałe (1981). PIE biodiversity index was determined through the application of the following formula: where: N -total number of individuals; pi -share of i species in total number of individuals.

RESULTS AND DISCUSSION
The objective of the research conducted in the course of 2008 -2012 was to determine the qualitative and quantitative structure of macrozoobenthos in the lakes of the Barlinek-Gorzów Landscape Park in the summer season. The research enabled estimating how far the eutrophication processes have advanced in selected lakes of the Barlinek-Gorzów Landscape Park. Qualitative and quantitative analyses of the macrozoobenthos structure in the lakes Barlinek-Gorzów Landscape Park were conducted in the summer seasons of 2008, 2010 and 2012.
The average concentration of total benthic fauna in the Barlinek Lake in the summer of 2008 -1371 (indiv.·m -2 ) (table 6). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 90% of the density of benthic fauna. The average concentration of total benthic fauna in the Barlinek Lake in the summer of 2010 -1648 (indiv.·m -2 ) (table 7). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 90% of the density of benthic fauna. The average concentration of total benthic fauna in the Barlinek Lake in the summer of 2012 -1233 (indiv.·m -2 ) (table 8). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 91% of the density of benthic fauna. In 2008, 2010, 2012 attendance related macrofauna test bed showed that the most common they were mudeating and larvae Chironomids, Oligochaeta (F = 100%), which consisted of Tischlera classification of the species is absolutely solid. Among larvae of Chironomidae the species is absolutely integral were Chironomus f.l. plumosus (F = 100%). However Chaoborus sp. belong to the accesoric species. Other designated species of fauna were accidental species of benthic (F) = 17% (table 3 -5).
International Letters of Natural Sciences Vol. 36 63 Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal. During the macrozoobenthos Suche Lake there are among the collected of organisms with eight clusters: Oligochaeta, Hirudinea, Isopoda, Ephemeroptera larvae, Trichoptera larvae, Diptera larvae, Bivalvia, Megaloptera larvae. The most represented in terms of species was represented in July which featured Insecta cluster larvae with four rows: Ephemeroptera (Leptophlebia sp., Ephemera sp., Caenis macrura (Stephens)), Trichoptera (Limnephilidae, Leptoceridae, Cyrnus sp.) Diptera larvae i Megaloptera larvae (Sialis lutaria L.) (table 11 -13). The average concentration of total benthic fauna in the Suche Lake in the summer of 2008 -616 (indiv.·m -2 ) (table 14). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 82% of the density of benthic fauna. The average concentration of total benthic fauna in the Suche Lake in the summer of 2010 -864 (indiv.·m -2 ) (table 15). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 86% of the density of benthic fauna. The average concentration of total benthic fauna in the Suche Lake in the summer of 2012 -953 (indiv.·m -2 ) (table 16). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 90% of the density of benthic fauna. In 2008, 2010, 2012 attendance related macrofauna test bed showed that the most common they were mudeating and larvae Chironomids, Oligochaeta (F = 100%), which consisted of Tischlera classification of the species is absolutely solid. Among larvae of Chironomidae the species is absolutely integral were Chironomus f.l. plumosus (F = 100%). However Chaoborus sp. belong to the accesoric species. Other designated species of fauna were accidental species of benthic (F) = 17% (table 11 -13).
Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal.
During the macrozoobenthos Lubiszewko Lake there are among the collected of organisms with eight clusters: Oligochaeta, Hirudinea, Isopoda, Ephemeroptera larvae, Trichoptera larvae, Diptera larvae, Bivalvia, Megaloptera larvae. The most represented in terms of species was represented in July which featured Insecta cluster larvae with four rows: Ephemeroptera (Leptophlebia sp., Ephemera sp., Caenis macrura (Stephens)), Trichoptera (Limnephilidae, Leptoceridae, Cyrnus sp.) Diptera larvae i Megaloptera larvae (Sialis lutaria L.) (table 19 -21). The average concentration of total benthic fauna in the Lubiszewko Lake in the summer of 2008 -788 (indiv.· m -2 ) (table 22). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 82% of the density of benthic fauna. The average concentration of total benthic fauna in the Lubiszewko Lake in the summer of 2010 -954 (indiv.·m -2 ) (table 23). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 84% of the density of benthic fauna. The average concentration of total benthic fauna in the Lubiszewko Lake in the summer of 2012 -970 (indiv.·m -2 ) (table 24). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 83% of the density of benthic fauna. In 2008, 2010, 2012 attendance related macrofauna test bed showed that the most common they were mudeating and larvae Chironomids, Oligochaeta (F = 100%), which consisted of Tischlera classification of the species is absolutely solid. Among larvae of Chironomidae the species is absolutely integral were Chironomus f.l. plumosus (F = 100%). However Chaoborus sp. belong to the accesoric species. Other designated species of fauna were accidental species of benthic (F) = 17% (table 19 -21).
Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal.

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Volume 36 The most represented in terms of species was represented in July which featured Insecta cluster larvae with four rows: Ephemeroptera (Leptophlebia sp., Ephemera sp., Caenis macrura (Stephens)), Trichoptera (Limnephilidae, Leptoceridae, Cyrnus sp.) Diptera larvae i Megaloptera larvae (Sialis lutaria L.) (table 27 -29). The average concentration of total benthic fauna in the Przyłęg Lake in the summer of 2008 -635 (indiv.·m -2 ) ( Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal. During the macrozoobenthos Chłop Lake there are among the collected of organisms with eight clusters: Oligochaeta, Hirudinea, Isopoda, Ephemeroptera larvae, Trichoptera larvae, Diptera larvae, Bivalvia, Megaloptera larvae. The most represented in terms of species was represented in July which featured Insecta cluster larvae with four rows: Ephemeroptera (Leptophlebia sp., Ephemera sp., Caenis macrura (Stephens)), Trichoptera (Limnephilidae, Leptoceridae, Cyrnus sp.) Diptera larvae i Megaloptera larvae (Sialis lutaria L.) (table 35 -37). The average concentration of total benthic fauna in the Chłop Lake in the summer of 2008 -686 (indiv.·m -2 ) (table 38). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 86% of the density of benthic fauna. The average concentration of total benthic fauna in the Chłop Lake in the summer of 2010 -839 (indiv.·m -2 ) (table 39). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 88% of the density of benthic fauna. The average concentration of total benthic fauna in the Chłop Lake in the summer of 2012 -850 (indiv.·m -2 ) (table 40). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 86% of the density of benthic fauna. In 2008, 2010, 2012 attendance related macrofauna test bed showed that the most common they were mudeating and larvae Chironomids, Oligochaeta (F = 100%), which consisted of Tischlera classification of the species is absolutely solid. Among larvae of Chironomidae the species is absolutely integral were Chironomus f.l. plumosus (F = 100%). However Chaoborus sp. belong to the accesoric species. Other designated species of fauna were accidental species of benthic (F) = 17% (table 35 -37).
Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal.
The average concentration of total benthic fauna in the Lubie Lake in the summer of 2008 -569 (indiv.·m -2 ) (table 46). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 78% of the density of benthic fauna. The average concentration of total benthic fauna in the Lubie Lake in the summer of 2010 -648 (indiv.·m -2 ) (table 47). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 87% of the density of benthic fauna. The average concentration of total benthic fauna in the Lubie Lake in the summer of 2012 -760 (indiv.·m -2 ) (table 48). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 84% of the density of benthic fauna. In 2008, 2010, 2012 attendance related macrofauna test bed showed that the most common they were mudeating and larvae Chironomids, Oligochaeta (F = 100%), which consisted of Tischlera classification of the species is absolutely solid. Among larvae of Chironomidae the species is absolutely integral were Chironomus f.l. plumosus (F = 100%). However Chaoborus sp. belong to the accesoric species. Other designated species of fauna were accidental species of benthic (F) = 17% (table 43 -45).
Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal.
During the macrozoobenthos Wielgie Lake there are among the collected of organisms with eight clusters: Oligochaeta, Hirudinea, Isopoda, Ephemeroptera larvae, Trichoptera larvae, Diptera larvae, Bivalvia, Megaloptera larvae. The most represented in terms of species was represented in July which featured Insecta cluster larvae with four rows: Ephemeroptera (Leptophlebia sp., Ephemera sp., Caenis macrura (Stephens)), Trichoptera (Limnephilidae, Leptoceridae, Cyrnus sp.) Diptera larvae i Megaloptera larvae (Sialis lutaria L.) (table 51 -53). The average concentration of total benthic fauna in the Wielgie Lake in the summer of 2008 -634 (indiv.·m -2 ) (table 54). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 85% of the density of benthic fauna. The average concentration of total benthic fauna in the Wielgie Lake in the summer of 2010 -813 (indiv.·m -2 ) (table 55). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 84% of the density of benthic fauna. The average concentration of total benthic fauna in the Wielgie Lake in the summer of 2012 -825 (indiv.·m -2 ) (table 56). The Greatest the importance of littoral Oligochaeta and Hirudinea, took in the larvae of Chironomidae, that accounted for 86% of the density of benthic fauna. In 2008, 2010, 2012 attendance related macrofauna test bed showed that the most common they were mudeating and larvae Chironomids, Oligochaeta (F = 100%), which consisted of Tischlera classification of the species is absolutely solid. Among larvae of Chironomidae the species is absolutely integral were Chironomus f.l. plumosus (F = 100%). However Chaoborus sp. belong to the accesoric species. Other designated species of fauna were accidental species of benthic (F) = 17% (table 51 -53).
Concentration of macrozoobenthos in littoral zone was mostly higher than in profundal.
By comparing the average density of benthic fauna of the lakes Barlinek-Gorzów Landscape Park with the lakes Western and Northern Polish you can see big changes in the density of taxa studied (table 58). In comparison with other lakes Western and Northern Polish in the lakes Barlinek-Gorzów Landscape Park is a large number of taxa, however, as a result of the distribution of non-harmonic doesn't translate to the indicator value of biodiversity index PIE (table 58).
On the basis of the analysis of research in the Western and Northern Polish Lakes summer macrozoobenthos it can be concluded that in the lakes Barlinek-Gorzów Landscape Park very intensively develop Oligochaeta. While the larvae of Chironomidae subdominants status in the period under review amounting to water, developed in other lakes much more intensely, acting mostly the main ingredient of benthic fauna (table 58).

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The results obtained have revealed that the ecological condition of the water in the lakes Barlinek-Gorzów Landscape Park is very bad. The biodiversity of the benthic macrofauna in the lakes Barlinek-Gorzów Landscape Park is poor, consisting of seven taxones only, where Oligochaeta and Chironomidae larvae (represented primarily by the genera Chironomus f.l. plumosus L., Chaoborus sp. and Procladius sp.) are dominant. According to the BMWP-PL index, the lakes water quality is generally very low [34,35,57,68,71,72]. Taxa representing Bivalvia, Ephemeroptera, Trichoptera larvae and Diptera larvae to the most frequently occurring organisms. Domination in the lakes Barlinek-Gorzów Landscape Park of Bivalvia was stated with invasive species Dreissena polymorpha (Pall.).  Table 3. Qualitative amount bottom fauna in the Barlinek Lake in July of 2008 Table 4. Qualitative amount bottom fauna in the Barlinek Lake in July of 2010 Table 5. Qualitative amount bottom fauna in the Barlinek Lake in July of 2012 Table 6. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Barlinek Lake (July of 2008) Table 7. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Barlinek Lake (July of 2010) Table 8. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Barlinek Lake (July of 2012) Table 9. Macrozoobenthos condensing in summer of Barlinek Lake Table 10. Type of bottom deposits, depth and pH of interstitial waters in measurement points Suche Lake (July 2008, 2010, 2012) Table 11. Qualitative amount bottom fauna in the Suche Lake in July of 2008 Table 12. Qualitative amount bottom fauna in the Suche Lake in July of 2010 Table 13. Qualitative amount bottom fauna in the Suche Lake in July of 2012 Table 14. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Suche Lake (July of 2008) Table 15. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Suche Lake (July of 2010) Table 16. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Suche Lake (July of 2012) Table 17. Macrozoobenthos condensing in summer of Suche Lake Table 18. Type of bottom deposits, depth and pH of interstitial waters in measurement points Lubiszewko Lake (July 2008, 2010, 2012) Table 19. Qualitative amount bottom fauna in the Lubiszewko Lake in July of 2008 Table 20. Qualitative amount bottom fauna in the Lubiszewko Lake in July of 2010 Table 21. Qualitative amount bottom fauna in the Lubiszewko Lake in July of 2012 Table 22. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Lubiszewko Lake (July of 2008) Table 23. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Lubiszewko Lake (July of 2010) Table 24. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Lubiszewko Lake (July of 2012) Table 25. Macrozoobenthos condensing in summer of Lubiszewko Lake Table 26. Type of bottom deposits, depth and pH of interstitial waters in measurement points Przyłęg Lake (July 2008, 2010, 2012) Table 27. Qualitative amount bottom fauna in the Przyłęg Lake in July of 2008 Table 28. Qualitative amount bottom fauna in the Przyłęg Lake in July of 2010 Table 29. Qualitative amount bottom fauna in the Przyłęg Lake in July of 2012 Table 30. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Przyłęg Lake (July of 2008) Table 31. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Przyłęg Lake (July of 2010) Table 32. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Przyłęg Lake (July of 2012)     Table 38. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Chłop Lake (July of 2008) Table 39. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Chłop Lake (July of 2010) Table 40. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Chłop Lake (July of 2012) Table 41. Macrozoobenthos condensing in summer of Chłop Lake Table 42. Type of bottom deposits, depth and pH of interstitial waters in measurement points Lubie Lake (July 2008, 2010, 2012) Table 43. Qualitative amount bottom fauna in the Lubie Lake in July of 2008 Table 44. Qualitative amount bottom fauna in the Lubie Lake in July of 2010 Table 45. Qualitative amount bottom fauna in the Lubie Lake in July of 2012 Table 46. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Lubie Lake (July of 2008) Table 47. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Lubie Lake (July of 2010) Table 48. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Lubie Lake (July of 2012) Table 49. Macrozoobenthos condensing in summer of Lubie Lake Table 50. Type of bottom deposits, depth and pH of interstitial waters in measurement points Wielgie Lake (July 2008, 2010, 2012) Table 51. Qualitative amount bottom fauna in the Wielgie Lake in July of 2008 Table 52. Qualitative amount bottom fauna in the Wielgie Lake in July of 2010 Table 53. Qualitative amount bottom fauna in the Wielgie Lake in July of 2012 Table 54. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Wielgie Lake (July of 2008)

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Volume 36   Table 55. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Wielgie Lake (July of 2010) Table 56. Condensing of macrozoobenthos -C (10 2 individuals per m -2 ) and wet mass M (g mm m -2 ) at examined measurement stations on Wielgie Lake (July of 2012)