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Morphological variation of oospores in the population of Chara rudis A. Braun in a mesotrophic lake

Boszke P., Bociąg K.

Polish Journal of Ecology

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2008

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Vol. 56, nr 1

139-147

EN

The morphological variation of Chara rudis A. Braun oospores was examined in a local population in a deep (43 m), hardwater (34 mg Ca dm[^-3]) and mesotrophic (P[tot] 0.095 mg P dm[^-3], SD 8 m) lake (NW Poland). Two variants of population density and three variants of depth were taken into account. Oospores are 712.8 [plus or minus] 37.6 (600-817) [mi]m long and 452.6 [plus or minus] 34.2 (350-516) [mi]m wide. They have 8-13 ridges. The outer membrane is slightly granulated. The isopolarity index (length/width x 100) is 158.4 [plus or minus] 9.9 (140-190). The variation coefficient varies from 5% for oospore length to around 10% for fossa width. It was shown that the differences between oospores coming from individual depth and density variants are statistically significant. The biggest (733.21 [plus or minus] 33.3 [mi]m) oospores occurred on individuals growing at a depth of 3 m, while the smallest ones (673.3 [plus or minus] 43.4 [mi]m) at 5 m. The oospores from highly dense aggregations (> 50 individuals x 0.1 m[^-2]) were much longer and wider than oospores from scattered (<10 individuals x 0.1 m[^-2]) individuals. The observed intrapopulation variation of oospores can be regarded as a response to environmental changes along the depth gradient.

2

Cechy biometryczne oospor Lychnothamnus barbatus z Jeziora Łagowskiego

Boszke P., Pełechaty M., Pukacz A.

Ekologia i Technika

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2007

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R. 15, nr 3

79-84

PL

Lychnothamnus barbaius jest gatunkiem bardzo rzadkim w skali międzynarodowej, jedynym reprezentantem rodzaju Lychnothamnus w świecie. Nowe, nieznane wcześniej, stanowisko stwierdzono w Jeziorze Łagowskim w lecie 2004 roku. Prezentowane badania przedstawiają analizę biometryczną oospor tego gatunku na ww, stanowisku. Pomierzono długość i szerokość maksymalną oospory, ISI index (długość/ szerokość 100) oraz liczbę listew i szerokość bruzdy w położeniu równikowym. Długość oospor mieści się w przedziale 583,5 - 733,5 \im, a szerokość waha się w zakresie 383,4 - 683,4 pm. ISI index wynosi średnio 139, a jego zakres mieści się w przedziale od 90 do 170. Na powierzchni oospor występuje 8-9 listew. Szerokość bruzdy waha się w granicach 66,7 - 83,4 urn, Zakresy większości cech oospor Lychnothamnu barbatus pochodzących z jednej populacji są szerokie, szersze nawet nieco od podawanych w literaturze dla tego gatunku. Cechą wykazującą największą zmienność jest szerokość oospory (V = 7%), a najmniejszą długość oospory i szerokość bruzdy (V = 4%).

EN

Lychnothamnus barbatus is a very rare on an international scale species, the only one representative of this genus in the world. This study present biometric analysis of Lychnothamnus barbatus oospores. Length and maximum width of oospores, ISI index (length/width*100), number of ridges and width of fossa at eąuator were measured. Oospores are 583.5 - 733.5 urn long and 383.4 - 683.4 pm wide, with 8-9 ridges on their surface. Width of fossa ranges from 66.7 to 83.4 pm. ISI index ranges from 90 to 170, with an average of 139. The variation of majority features is broader than this reported in literature. The width of the oospores is the most changeable feature (V = 7%) whereas length of oospores and width of fossa are the least varied features (V = 4%).

3

Zmienność morfologiczna oospor chara fragilis desv. w różnych typach ekosystemów wodnych Wielkopolski (materiały Kolekcji Ramienic Polski profesor Izabeli Dąmbskiej

Boszke P., Pełechaty M.

Ekologia i Technika

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2006

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R. 14, nr 3

118-122

PL

Celem prezentowanych badań jest określenie zmienności morfologicznej oospor Chara fragilis w odniesieniu do różnych typów środowisk wodnych. Do badań biometrycznych pobrano oospory z jezior, torfianek, stawów i rowów zlokalizowanych w Wielkopolsce.

EN

The aim of the present study is to investigate variation in morphology of oospores of Chara fragilis Desv. in relation to different types of aquatic ecosystems. Oospores were collected from lakes, peat-hags, ponds and ditches in the Wielkopolska region (materials from Professor Izabela Dąmbska Collection of Charophytes of Poland, Department of Hydrobiology, Adam Mickiewicz University, Poznań, Poland). The analysis of morphometrical criteria covered following features: oospore length, maximum width, length: width ratio, number and width of ridges. Results demonstrated a statistically sound variation among examined aquatic ecosystems. Clearly visible differences were found among lakes, peat-hags and ponds. The last group particularly differed from the rest. Ditches represented intermediate values of the features studied.

4

Population structure and regeneration of Phragmites australis (Cav.) Trin. ex Steud. in flood control ditches in the depression wetland (Żuławy Wiślane, Northern Poland)

Boszke P., Bociąg K., Szmeja J.

Polish Journal of Ecology

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2005

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Vol. 53, nr 1

3-12

EN

The population structure of Phragmites australis (Cav.) Trin. ex Steud. was examined in seven categories of overgrowing flood control ditches, differing on time which had elapsed from the last clean-up. Density, biomass, frequency of development stages, as well as the size and habit of the shoots, were determined in the populations. Site conditions in the ditches and the proportion of the common reed in the total biomass of plants were also examined. The rate at which populations in cleaned ditches regenerate is very quick. Three years after the maintenance works in ditches the reed population is already fully regenerated. Well developed reed rushes, which biomass is about 650 g d.w.m-2, are dominant. Its density amounts to 76 ± 25 shoots m-2. Flowering and fruiting shoots are the most numerous. The first signs of population regression were observed in the ditches left without cleaning for more than 5 years. Population density is gradually lower, the proportion of generative shoots is reduced, and the reed is lighter and has smaller assimilation area. In the 11-year-old and older ditches the reed is replaced by other plant species, mainly grasses and shrubs.