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Abstract

Algological investigations were focused on taxonomy, chorology and ecology of threatened filamentous green alga species in Poland. Studies on Oedogonium capillare Kützing ex Hirn growing in large quantities in association with Cladophora rivularis (Linnaeus) Hoek in pond were conducted. The aim of these studies was to describe the distribution, ecology and morphology of O. capillare as part of a more comprehensive study of this filamentous green alga. It is the eighth record in Poland for O. capillare. Filaments of O. capillare were grown over a wide pH range (7.3-9.6) and in high variability of nutrients. Vegetative cells, oogonia and antheridia were observed, which allowed taxonomic identification. O. capillare occurs in eutrophic waters which requires protection of its habitat.

Abstract

The algal leaf spot, caused by Cephaleuros virescens Kunze, has been reported in a wide range of plant species from the tropical and subtropical areas worldwide. Investigations on the presence of algal infection mostly involved wild plants and plantation crops of economic interest. Nevertheless, limited studies have examined cultivated ornamental plants for the presence of C. virescens. During the summer and monsoon seasons of 2011 we examined ten leaves of five plants belonging to 86 ornamental plant taxa in 38 families growing in home gardens in Coimbatore, Tamil Nadu, India for the algal presence. Nine of the 86 plant taxa were found to host the algae C. virescens. Although majority of the investigated species are considered as typical hosts of C. vi-rescens, its infection was found only in nine plant species. Although the incidence of the algal leaf spot disease was in general low, there was significant variation in the frequency of occurrence of the algal lesions and the lesion size among the investigated plant taxa and seasons. On plants of five species (Alpinia purpurata, Ficus benjamina, Ficus elastica “Variegata”, Michelia champaca, Polyalthia longifolia), C. virescens was found during both seasons, while infections on the remaining four species (Aglaonema commutatum, Dieffenbachia maculata, Eucalyptus globulus, Syngonium podophyllum) were observed only during the monsoon. The susceptibility of different plant species in a genus and varieties of a species varied suggesting the host influence on the development of infections in addition to variation attributed to the local environmental conditions.

Abstract

Sampling of fouling organisms carried out during January 2019 at Al-Max (west of the city of Alexandria) on the Mediterranean coast of Egypt revealed the presence of larval populations belonging to the genus Telmatogeton (Chironomidae), which is reported for the first time from the Mediterranean coast of Egypt. The larvae were found among clumps of fine filamentous green algae (Enteromorpha compressa). A description of the larva with taxonomic remarks and comments on its ecology and geographical distribution are given.

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photosynthesis by reef organisms, notably corals, coralline algae and ubiquitous, all-pervasive filamentous green algae (note that most of the significant calcifiers on reefs are photosynthetic; examples are green algae, foraminiferans and giant clams). During the day photosynthesis considerably exceeds respiration. During the night there is only respiration. Hence, at night, addition of CO 2 to the water mass by respiration of benthic organisms decreases the pH. Notice that the organisms at the back of a reef flat are experiencing daily a shift in pH that our alarmist