Transactions
of the Azov-Black Sea Ornithological Station
Branta Cover Language of the article: Russian Cite: Arkhipov, A. M. (2005). Fishing commensalism of gulls in relation to Great Crested Grebe (Podiceps cristatus) and Goosander (Mergus merganser).. Branta: Transactions of the Azov-Black Sea Ornithological Station, 8, 193-194 Keywords: fishing commensalism, gulls, Great Creasted Grebe, Goosander Views: 315 Branta copyright Branta license

Branta Issues > Issue №8 (2005)

Branta: Transactions of the Azov-Black Sea Ornithological Station, 193-194

Fishing commensalism of gulls in relation to Great Crested Grebe (Podiceps cristatus) and Goosander (Mergus merganser).

A. M. Arkhipov

The note describes a mid-winter observation. Yellow-legged Gull and Black-headed Gull were preying on fish when Great Crested Grebe and Goosander chased a victim beneath the water surface. The observation took place on Kuchurganskiy Liman situated in Odessa region, Ukraine.

The grebe or goosander dived on depth and apparently pursued a fish stock. When they dipped, gulls being close to them took off and watched them flying at height up to 2-3 m over water. When the pursuer came to the surface the gull was keeping itself in the hovering flight over water for a few time and then plunged into the water to catch fish frighten upwards by an under-water fisher. Sometimes gulls managed to capture prey, and a grebe or goosander emerged and ate the caught fish without obstacle. No competition was between under-water catchers and spongers.

Read the paper in a PDF file