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- Title
NEW OBSERVATIONS REGARDING THE AQUATIC AVIFAUNA FROM ROSPA0010BISTREȚ (SW ROMANIA).
- Authors
Mirela-Sabina, RIDICHE
- Abstract
In the present study, we render certain new aspects of the structure of the communities of aquatic birds belonging to the Pelecaniformes and Charadriiformes Orders, located within ROSPA0010Bistreț in the Danube Floodplain (South-West of Romania), during the vernal and summery seasons (May-July), in the years 2013 and 2020. We notice that the biotopes in the area of Bistreț Lake are in continuous transformation, especially as a result of the abandonment of the fishing activities that took place here until 2006. This fact positively influences the composition and density of the aquatic avifauna. An important factor that triggered the changes in the spectrum of the aquatic avifauna of SPA Bistreț is the climatic one. In recent years, as a consequence of the lower amounts of precipitations, we remarked a significant increase in the number of pelicans (e.g. P. onocrotalus with a maximum number of 500 of individuals, adults and immatures), whose feeding requirements are met by shallow or medium water level basins. The current ecological conditions have created trophic opportunities and have favoured the establishment of several colonial or solitary nesting species of the Order Pelecaniformes (Botaurus stellaris, Ixobrychus minutus, Nycticorax nycticorax, Ardeola ralloides Egretta garzetta, Ardea purpurea, Platalea leucorodia, Plegadis falcinellus). The periodical fluctuations of the water level especially influences the dynamics of the species and populations belonging to the Order Charadriiformes. We mention several species belonging to the aforementioned order that have nested here for several successive years (Himantopus himantopus, Vanellus vanellus, Limosa limosa, Chroicocephalus ridibundus, Chlidonias hybrida) or after a long absence during the breeding season: Glareola pratincola, Sternula albifrons. Although they are species of faunal and conservative interest, also included in the EC Birds Directive, Glareola pratincola and Sternula albifrons are not included in the standard data form of Bistreț site, due to their absence during the period of documentation and registration of the lake in the Natura 2000 network, probable; it is necessary a special monitoring and protection of the colonies if they maintain within the protected area. Moreover, in the near future, the revision of the standard data form of the site have to be considered so that the new bird community may benefit from concrete conservation measures.
- Subjects
ROMANIA; WATER birds; WATER levels; WATER depth; BIRD communities; CHARADRIIFORMES; CICONIIFORMES
- Publication
Oltenia, Studii si Comunicari Seria Stiintele Naturii, 2021, Vol 37, Issue 1, p117
- ISSN
1454-6914
- Publication type
Article