Wyniki wyszukiwania - BazTech

1

The release of phosphorus and nitrogen by living and decomposing snails

Rybak J.

Polish Journal of Ecology

|

2002

|

Vol. 50, nr 1

17-24

EN

The excretion of P-PO4 and N-NH4 by snails (Lymnaea (Lymnaea) stagnalis, Lymnaea (Radix) auricularia and Planorbarius corneus) was measured in laboratory experiments. For L.(L.) stagnalis the release of these elements from decomposing animals and their faecal material were also determined. Amounts of nutrients excreted by the snails studied varied greatly in the ranges ,1 to 70 [mi]g P-PO4 and <2 to over 200 [mi]g N-NH4 per individual. These amounts were very much related to the sizes of snails. The phosphorus and nitrogen contained in the tissues of L.(L.) stagnalis are released to the water very rapidly due to the rapid decomposition that the bodies of snails undergo. The release of phosphorus from frshly produced faecal matter is considerable - even greater than the excretion by live snails (expressed per unit weight). However, the limited mass of faeces produced as compared with the body weight of an snail, ensures that this still accounts for only 3% of daily excretion of phosphorus from the body of a live snail.

2

Differentiation of subfossil populations of snails from Vistulian loesses of Southern Poland

Łopuszyńska M.

Folia Quaternaria

|

2002

|

nr 73

101-189

EN

Mollusc shells are commonly noted from loesses and loess-like deposits. The typical feature of loessial malaconecrocoenozes is their abundance with relatively low number of species. The strength of specimens, which are different by their nature themselves, has allocated many low-level taxons within particular species. In many cases, the bases for such allocation are metric features of shells. The author has tried to decide the taxonomic question of the most important and the most frequent species which occur in loess deposits i.e., Succinea oblonga, Pupilla muscorum, Pupilla loessica, Trichia hispida, and Arianta arbustorum.

3

Can molluscs be bioindicators of heavy metal contamination of the Zegrzyński reservoir (central Poland)?

Jurkiewicz-Karnkowska E.

Chemia i Inżynieria Ekologiczna

|

2000

|

Vol. 7, nr 10

1067-1076

EN

The work presented evaluation of the possibility of molluscs application in bioindication of the Zegrzyński Reservoir contamination with heavy metals (Cu, Zn, Mn, Fe, Pb and Cd). Correlations ofthe concentration ofthese metais in molluscs and other elements of the investigated ecosystem wece carried out. Molluscs reflected the Cu concentration in the environment better than Zn, Mn and Zn. Numerous statistically significant correlations of non-essential metailevel, especially Pb, in molluscs and in different elements of the reservoir ecosystem wece found. Investigated molluscs seem to be useful in bioindication ofthe reservoir contamination particularly with Pb and Cu.

PL

Celem pracy było określenie możliwości zastosowania mięczaków w bioindykacji zanieczyszczenia Zbiornika Zegrzyńskiego metalami ciężkimi (Cu, Zn, Mn, Fe, Pb i Cd) na podstawie korelacji między stężeniami tych pierwiastków w mięczakach i innych elementach badanego ekosystemu. Spośród analizowanych metali biofilnych mięczaki odzwierciedlały w największym stopniu stężenie Cu w środowisku. Liczne istotne statystycznie korelacje między poziomem metali ksenobiotycznych, szczególnie Pb, w mięczakach i różnych elementach ekosystemu zbiornika wskazują na możliwości wykorzystania badanych gatunków mięczaków w bioindykacji skażenia Zbiornika Zegrzyńskiego tymi pierwiastkami. Uzyskane wyniki powinny być zweryfikowane na podstawie większej liczby danych.