Hydrobiologia
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Growth and feeding of Fredericella sultana (bryozoa) in the outlet of a humic acid lake
Hydrobiologia - Tập 101 - Trang 115-120 - 1983
Monthly observations on the bryozoa Fredericella sultana have been carried out in the outlet of a humic acid lake for more than two years. The growth of the colonies were rapid during algal bloom and in fall the colonies almost covered the free underside of nearly all stones on the bottom. In winter most of the colonies died out, but scattered individuals were also observed alive during this perio...... hiện toàn bộ
Biological activity in Macrocystis pyrifera from Argentina: sodium alginate, fucoidan and laminaran. III. Antiviral activity
Hydrobiologia - Tập 151 - Trang 497-500 - 1987
Factors affecting long-term survival of dry bdelloid rotifers: a preliminary study
Hydrobiologia - Tập 387 - Trang 327-331 - 1998
Naturally dried lichens and mushrooms were collected, stored at various relative humidities and temperatures either under air or argon, and extracted in a 0.2 M sucrose solution to determine the long-term survival of resident bdelloid rotifers. Survivorship of rotifers in samples kept at 21 °C for 8 months declined at both < 1% and 76% humidities, but remained the same as the starting levels at 23...... hiện toàn bộ
The diet and growth of O-group flounder, Platichthys flesus (L.), in the River Dee, North Wales
Hydrobiologia - Tập 178 - Trang 193-198 - 1989
Many O-group flounder, Platichthys flesus, live in the lower reaches of rivers in North West Europe; while there is extensive information on the niche that they occupy in estuarine and marine environments, little is known of their life in freshwater. The diet of O-group flounder in the Lower Welsh River Dee was studied by stomach contents analysis of diel and seasonal samples. The dominant prey we...... hiện toàn bộ
Morphological disparity in ecologically diverse versus constrained lineages of Lake Malaŵi rock-dwelling cichlids
Hydrobiologia - Tập 832 - Trang 153-174 - 2018
Lake Malaŵi cichlids have evolved rapidly, extensively, and in some cases iteratively to fill an array of ecological niches; however, neither species richness nor trophic diversity is distributed equally across lineages. In the context of evolutionary theory, such differences offer predictions about the magnitudes and patterns of morphological variation within lineages. In this paper, we use geome...... hiện toàn bộ
Photosynthetic activity of phytoplankton in a high altitude lake (Emerald Lake, Sierra Nevada, California)
Hydrobiologia - Tập 230 - Trang 37-48 - 1992
Photosynthetic activity by phytoplankton was measured during the ice-free seasons of 1984, 1985 and 1987 using the 14C radioassay in high altitude Emerald Lake (California). Relative quantum yield (αB) and light-saturated chlorophyll-specific carbon uptake (Pm
B) were calculated from the relationship of light and photosynthesis fitted to a hyperbolic tangent function. Temporal changes in Pm
B show...... hiện toàn bộ
Quaternary and recent Lamprothamnium groves (Charophyta) from Argentina
Hydrobiologia - Tập 267 Số 1 - Trang 143-154 - 1993
Only recently have extant Lamprothamnium species been reported from the American continent. L. succinctum (A. Br. in Asch.) R. D. W. was found in Lago Titicaca, Bolivia and L. haesseliae Dont. en Laguna Luro and Laguna La Salada, Argentina. Fossil gyrogonites of L. succinctum and L. haesseliae, however, are here reported to be widely distributed in Quaternary sediments of Argentina, associated wit...... hiện toàn bộ
The physiological response of Northern krill (Meganyctiphanes norvegica) to temperature gradients in the Kattegat
Hydrobiologia - - 2000
The Alkor-Deep (140 m), which forms part of a depression system in the northern Kattegat channel east of the island of Læsø (Denmark), is the location of a self sustaining population of Northern krill, Meganyctiphanes norvegica (Euphausiacea). This population is exposed to one of the most pronounced thermal gradients within the distributional range of this pelagic crustacean. During summer, the te...... hiện toàn bộ
Distribution Pattern of γ-amino Butyric Acid Immunoreactive Neural Structures in the Central and Peripheral Nervous System of the Tubificid Worm, Limnodrilus hoffmeisteri
Hydrobiologia - Tập 564 - Trang 33-43 - 2006
By means of whole-mount immunohistochemistry, putative inhibitory (GABAergic) neural structures were identified in the central and peripheral nervous system of the tubificid worm, Limnodrilus hoffmeisteri. In the supraoesophageal ganglion (brain) only few strongly labelled cells were observed. However, in its commissural part a high number of stained nerve fibres, arising mainly from the ventral n...... hiện toàn bộ
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