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| Ponsero, Alain; Le Mao, Patrick. |
| The biomass and productivity of benthic invertebrates were studied in the bay of Saint-Brieuc in connection with the consumption by the nine most numerous wader and duck species present on the site. This consumption is about 1.9 g ash free dry weight/m2/year, it is similar to that obtained in the bay of Mont-Saint-Michel but very lower to results from Wadden Sea. Eutrophication generally induces an increase in overall productivity of the intertidal coastal ecosystem, as it has been observed in the German part of the Wadden Sea since the 1950s. Consequently, the bird populations grow very significantly in eutrophic systems. But this is not the case in the bay of Saint-Brieuc where macrozoobentic biomass produced and consumed by birds is comparable to what... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00049/16074/13550.pdf |
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| Ponsero, Alain; Sturbois, Anthony; Simonin, Alicia; Godet, Laurent; Le Mao, Patrick. |
| The diversity and abundance of birds present in intertidal coastal ecosystems are closely related to the biomass of benthic invertebrates. The assessment of energy consumed compared with the available resource is one of the fundamental aspects of intertidal foodweb studies. The feeding of birds on benthic invertebrates was studied in the bay of Saint-Brieuc, a 2900 ha tidal bay located on the Côtes d’Armor coast (Brittany). The consumption of the nine most numerous wader and duck species present on the site was valued at 1.9 g AFDW/m²/yr. This is comparable with results observed in the Mont Saint-Michel bay but much lower than results from the Wadden sea. In order to further the understanding of the predator-prey system, the taking into account of local... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00156/26688/24751.pdf |
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| Ponsero, Alain; Sturbois, Anthony; Desroy, Nicolas; Le Mao, Patrick; Jones, Auriane; Fournier, Jerome. |
| The relationship between foraging shorebirds, macrobenthos and sedimentary parameters has been widely studied across Western Europe. Megatidal areas have large zones uncovered when the water retreats. Consequently, in such cases, the tide also influences foraging activities. This paper examines the use of an intertidal space by waders to define how macrobenthic resource concentrates foraging activity of birds in a large megatidal sandflat. This approach combines accurate spatial distribution of waders (Oystercatcher, Eurasian curlew, Bar-tailed Godwit and Redknot) according to their activity with ecological/biological parameters. A differential exploitation of the flat is clearly shown, with macrobenthic biomass appearing as one of the main explanatory... |
| Tipo: Text |
Palavras-chave: Waders; Benthos; Foraging behavior; Sandflat; Megatidal environment. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00340/45168/44563.pdf |
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| Ponsero, Alain; Le Mao, Patrick; Yesou, Pierre; Allain, Jeremy; Vidal, Justine. |
| The national nature reserve of Saint-Brieuc Bay, located in the north of Brittany, is a site of international importance for the wintering of the Black-bellied Brent goose Branta bernicla bernicla although its preferred food, eelgrass, is completely absent. Local monitoring points out that the green seaweeds Ulva armocicana represents 90% of the food eaten by the Brent geese. These algae are responsible for the spectacular green tides which greatly impact this bay each summer. The 400 odd tons consumed each winter by the Brent geese are insufficient to curb this phenomenon. However, the resorption policy of the nitrogenized surpluses arriving in the bay in order to fight against the aestival green tides could, in the long term, reduce this food resource... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6857.pdf |
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| Sturbois, Anthony; Ponsero, Alain; Desroy, Nicolas; Le Mao, Patrick; Fournier, Jerome. |
| The feeding ecology of the red knot has been widely studied across its wintering range. Red knots mainly select bivalves and gastropods, with differences between sites due to variation in prey availability. Shorebird’s diet is also influenced or controlled by the tidal regime. The aim of this paper is to demonstrate the adaptation of foraging red knots to the megatidal environment. The variation in their diet during tidal cycles was studied in the bay of Saint-Brieuc, a functional unit for this species. The method used combined macrofauna, distribution of foraging birds and diet data. Comparative spatial analyses of macrofauna and distribution of foraging red knots have shown that the bay's four benthic assemblages are exploited by birds. By analysing... |
| Tipo: Text |
Palavras-chave: Diet; Benthos; Intertidal flat; Megatidal environment; Bay of Saint-Brieuc. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00226/33767/32194.pdf |
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