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Functional response of midsummer planktonic and benthic communities in the Neva Estuary (Eastern Gulf of Finland) to anthropogenic stress

100%

Golubkov S. M., Alimov A. F., Telesh I. V., Anokhina L. E., Maximov A. A., Nikulina V. N., Pavel'eva E.B., Panov V. E.

Oceanologia

2003

tom 45

nr 1

Long-termhydrobiological research has shown that the functioning of the ecosystem of the Neva Estuary, one of the largest Baltic estuaries, has changed greatly since the beginning of the 20th century. Ineffective local water management in St.Petersburg during the last twenty years has stimulated the development of a natural ‘biological plug’ in the salt barrier zone in the inner part of the estuary and has altered the ecosystem’s functioning. These changes include an increase in primary production, in the primary production : organic matter decomposition ratio, and in pelagic-benthic coupling. It has also given rise to filamentous algae blooms and intensive secondary pollution in the coastal zone of the Neva Estuary. The primary production of phytoplankton in the inner part of the estuary has reached 2.3 gC m−2, that of the filamentous algae Cladophora glomerata 5.5 gC m−2; these figures are much higher than in other regions of the Gulf of Finland.

Iberian wild cat Felis silvestris tartessia predation on rabbit Oryctolagus cuniculus: functional response and age selection

100%

Gil-Sanchez J. M., Valenzuela G., Sanchez J. F.

Acta Theriologica

1999

tom 44

nr 4

Functional response and prey age selection have been studied for predator-prey relationships between the Iberian wild cat Felis silvestris tartessia Miller, 1907 and the rabbit Oryctolagus cuniculus (Linnaeus, 1758) through the study of the seasonal wild cat's diet and variations in rabbit availability in south-east Spain. This prey formed 73,7% of the total consumed biomass and was negatively correlated with trophic diversity. The wild cat showed a functional response approximate to Holling's type 2, exhibiting a high dependence on rabbit. The age class preferred was that of the juvenile rabbit, the smallest age class, and such hunting behaviour may be considered to be opportunistic. Results are discussed within the context of the relationship between the great size of this wild cat subspecies and the body size of the principal Iberian prey in Mediterranean areas, the rabbit.

Ograniczanie wyników

1 Acta Theriologica

1 Oceanologia

1 Alimov A. F.

1 Anokhina L. E.

1 Gil-Sanchez J. M.

1 Golubkov S. M.

1 Maximov A. A.

1 Nikulina V. N.

1 Panov V. E.

1 Pavel'eva E.B.

1 Sanchez J. F.

1 Telesh I. V.

1 Valenzuela G.

1 2003

1 1999

Wyniki wyszukiwania

Functional response of midsummer planktonic and benthic communities in the Neva Estuary (Eastern Gulf of Finland) to anthropogenic stress

Iberian wild cat Felis silvestris tartessia predation on rabbit Oryctolagus cuniculus: functional response and age selection