Steady-state phytoplankton assemblages in shallow Bulgarian wetlands

Stoyneva, Maya P.

doi:10.1023/b:hydr.0000004279.59719.7e

Cited by 46 publications

(60 citation statements)

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“…In the classification of trait-separated phytoplankton groups some characteristics of D (Nitzschia palea), P (Ulnaria ulna) and N (Cosmarium denticulatum) Reynolds associations describe the Gıcı Lake assemblages (Soylu and Gönülol, 2006). The species found are placed separately in groups S N , H1 and L M in Bulgarian wetlands (Stoyneva, 2003). As in Bulgarian wetlands, S N and H1 functional groups, which are tolerant to mixing and poor light conditions, were found dominant in Kastoria Lake, Greece.…”

Section: Discussionmentioning

confidence: 87%

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Soylu¹,

Gönülol²

2010

Turk. J. Fish. Aquat. Sci.

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Functional classification and composition of phytoplankton of Liman Lake were studied between January 2002 and December 2003. A total of 109 taxa belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Dinophyta, Xantophyta, Chrysophyta and Cryptophyta were identified. The succession during 2002 began with R-Strategists (with a high surface to volume ratio, including blue-green algae with filaments like Pseudanabaena limnetica Lemmermann). This group was followed by C-Strategists (small green algae characterised with fast nutrient absorption, assimilation and replication ratios). This group was again followed by R-Strategists and at last C-Strategists became dominant.

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Section: Discussionmentioning

confidence: 87%

“…Cyanophyta were found to be prominent in Bulgaria (Stoyneva, 2003) and in Hungary (Padisak and Reynolds, 1998), which are in the same climatic zone with Turkey. Cyanophytes were also the most numerous in Sanabria Lake (Spain) (Hoyos and Comin, 1999).…”

Section: Discussionmentioning

confidence: 99%

Untitled

Soylu¹,

Gönülol²

2010

Turk. J. Fish. Aquat. Sci.

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“…Physiological and behavioural flexibility of Chlorophyceae can accommodate environmental stresses better than most fast growing species (Silva, 2004). Second in prominence was Cyanophyceae, which had also been found to be prominent in Bulgaria (Stoyneva, 2003), Hungary (Padisak and Reynolds, 1998) and Sanabria Lake (Spain) (Hoyos and Comin, 1999). Cyanophyta dominance, and sometimes bloom are amongst the most visible symptoms of ORGANIC pollution (Moss et al, 1997), Toxic to living organisms and accelerated natural euthrophication (Stoyneva, 2003;Silva, 2005).…”

Section: > Phytoplanktonmentioning

confidence: 99%

“…Second in prominence was Cyanophyceae, which had also been found to be prominent in Bulgaria (Stoyneva, 2003), Hungary (Padisak and Reynolds, 1998) and Sanabria Lake (Spain) (Hoyos and Comin, 1999). Cyanophyta dominance, and sometimes bloom are amongst the most visible symptoms of ORGANIC pollution (Moss et al, 1997), Toxic to living organisms and accelerated natural euthrophication (Stoyneva, 2003;Silva, 2005). The observation in the waterfalls is similar to findings by Adeniyi (1978) that the abundance of phytoplankton increases with increase in transparency, which normally associated with black flood (dry season), while the high turbidity associated with the white flood (wet season) results in a decrease in its abundance.…”

Section: > Phytoplanktonmentioning

confidence: 99%

Distribution and dynamics of a tropical waterfalls ecosystem

Offem

Ikpi

2012

Knowl. Managt. Aquatic Ecosyst.

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Waterfalls gives the impression of a lifeless zone because researchers have historically focused on the hydrology, ecotourism and geological features. Effective management will require an understanding of changes in species composition and distribution of macro-biota. Monthly samples were taken in wet and dry seasons, over two year period in three regions along the 6817.7 m length of the Agbokum waterfalls. Macro-biota exhibited distinct pattern in respect of seasonal and spatial changes. Trachelomonas volzii, the most abundant phytoplankton species reduced from 686 in the dry season to 143 in the wet, and from 455 downstream to 91, midstream (waterfalls region). Zooplankton species Calanus finmarchicus decreased from 511 during dry season to 36 in the wet and from 334 downstream to 7, midstream. 71.7 percent of the total macro-invertebrates were recorded from downstream reaches while only 6.3 percent were contributed by midstream. Percentage cover of marginal vegetation by Bambusasp, Symphonia and Elaeis guineesis displayed progressive increase from upstream reaching a maximum of 38.5 mean percent cover in the relatively undisturbed downstream. In contrast, Raphia vinifera, Havea brasiliensis, Grewia sp. and Cocos nucifera shrank in size from 34% to 8% at the midstream stretches of the river while only nymphia-rich vegetation becomes more frequent in the middle reaches. The disturbance regimes of the midstream reaches of Agbokum waterfalls combined with its very low faunal and floral diversity has made the environment unstable therefore susceptible to the invasion of disturbance tolerant biota. RÉSUMÉ Distribution et dynamique d'un écosystème tropical de cascadesLes cascades donnent l'impression d'une zone morte parce que les chercheurs ont toujours mis l'accent sur l'hydrologie, l'écotourisme et les caractéristiques géologiques. Une gestion efficace nécessite la compréhension des changements dans la composition des espèces et la distribution des macro-organismes. Des échantillons mensuels ont été pris au cours des saisons humides et sèches, pendant plus de deux ans dans trois régions le long des 6817,7 m des cascades Agbokum. Les macrobiotes présentent des patterns différents selon les changements saisonniers et spatiaux. Calanus finmarchicus passe de 511 pendant la saison sèche à 36 en saison humide et de 334 en aval à 7, en zone médiane. 71,7 % du total des macroinvertébrés ont été rencontrés dans les tronçons situés en aval, tandis que seulement 6,3 % sont trouvés dans les tronçons médians.

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“…The algal flora of 33 glacial lakes in Bulgaria, not including Chernoto and Bezbog, was studied (30). Following a mainly taxonomical and floristic publication on phytoplankton (37), phytoplankton studies in glacial lakes have proceeded with occasional data for abundance and vertical distribution at the Seven Rila Lakes (3,4,5,22).…”

Section: Introductionmentioning

confidence: 99%