Association between aquatic vegetation and landscape indicators of human pressure

Aznar, Jean-Christophe; Dervieux, Alain; Grillas, Patrick

doi:10.1672/0277-5212(2003)023[0149:abaval]2.0.co;2

Cited by 48 publications

(25 citation statements)

References 47 publications

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“…We did not find any large-scale diet difference between released and wild Mallards after the supplementary feeding period either, although two seeds from plant species had a greater importance in released birds' diet. The first of these is L. peploides, a non-indigenous plant common in managed hunting estates (Aznar et al 2003;Lambert et al 2010;Mouronval and Baudouin 2010). The second species is wheat.…”

Section: Discussionmentioning

confidence: 99%

Low survival after release into the wild: assessing “the burden of captivity” on Mallard physiology and behaviour

Guillemain

Elmberg

et al. 2011

Eur J Wildl Res

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Captive-reared animals used in reinforcement programs are generally less likely to survive than wild conspecifics. Digestion efficiency and naive behaviour are two likely reasons for this pattern. The Mallard is a species with high adaptability to its environment and in which massive reinforcement programs are carried out. We studied physiological and behavioural factors potentially affecting body condition and survival of captive-reared Mallards after being released. Digestive system morphology and an index of body condition were compared among three groups: captive-reared birds remaining in a farm (control), captive-reared birds released into the wild as juveniles (released) and wild-born birds (wild). We also compared behaviour and diet of released vs. wild Mallards. Finally, we conducted a 1-year survival analysis of captive-reared birds after release in a hunting-free area. Gizzard weight was lower in control Mallards, but the size of other organs did not differ between controls and wild birds. The difference in gizzard weight between released and wild birds disappeared after some time in the wild. Diet analyses suggest that released Mallards show a greater preference than wild for anthropogenic food (waste grain, bait). Despite similar time-budgets, released Mallards never attained the body condition of wild birds. As a consequence, survival probability in released Mallards was low, especially when food provisioning was stopped and during harsh winter periods. We argue that the low survival of released Mallards likely has a physiological rather than a behavioural (foraging) origin. In any case, extremely few released birds live long enough to potentially enter the breeding population, even without hunting. In the context of massive releases presently carried out for hunting purposes, our study indicates a low likelihood for genetic introgression by captive-reared birds into the wild population.

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Section: Discussionmentioning

confidence: 99%

Low survival after release into the wild: assessing “the burden of captivity” on Mallard physiology and behaviour

Guillemain

Elmberg

et al. 2011

Eur J Wildl Res

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“…During the 20th century, temporary wetlands were subject to degradation and drastic area reduction in the Mediterranean region due to agriculture, industry, recreational activities, and hunting (Hollis, 1992;Grillas et al, 2004). One of the main causes of the degradation of Mediterranean temporary wetlands is the water management for hunting activities that maintains the water level in spring and/or in summer and that has led to a decline of plant communities that are restricted to temporary wetlands along with an increase in perennial and cosmopolitan species (Aznar et al, 2003;Tamisier and Grillas, 1994). Mediterranean temporary wetlands are thus considered a priority habitat (code 3170) according to the Natura 2000 Network of the European Union Habitats directive (European Commission, 1992).…”

Section: Introductionmentioning

confidence: 99%

Temporary wetland restoration after rice cultivation: is soil transfer required for aquatic plant colonization?

Muller

Buisson

Mouronval

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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Key-words:former ricefield, restoration, spontaneous colonization, soil transfer, temporary wetland Mediterranean temporary wetlands have considerably declined in recent decades. Today, opportunities arise for the restoration of these wetlands due to land-use changes, such as the abandonment of cultivation. One critical question is whether communities, such as those observed in natural temporary wetlands, can develop alone or if active restoration should be implemented. In a series of experimental mesocosms, we transferred soil from several temporary wetlands chosen as a set of reference ecosystems. Four months after soil transfer, vegetation in transfer mesocosms was compared to that derived from spontaneous colonization (control mesocoms). Transfer mesocosms are colonized by all target hydrophyte species transferred with the soil and the resulting communities are similar to those of reference ecosystems. They also have fewer non-target species than the control mesocosms. Even though the study period was not sufficient to draw any definitive conclusion regarding the utility of forced dispersion by soil transfer, the preliminary results are promising for an application on a larger scale. RÉSUMÉRestauration d'un milieu humide temporaire après culture du riz : le transfert de sol est-il nécessaire à la recolonisation des plantes aquatiques ? Mots-clés :anciennes rizières, restauration, colonisation spontanée, transfert de sol, zone humide Les marais temporaires méditerranéens ont vu leur superficie se réduire considé-rablement au cours des dernières décennies. Aujourd'hui, des opportunités apparaissent pour la restauration de ces zones humides, en particulier à partir d'espaces agricoles abandonnés. L'une des questions majeures est alors de savoir si les communautés telles que l'on peut les observer dans les marais temporaires naturels peuvent se développer seules ou si une restauration active doit être mise en place. Dans un ensemble de mésocosmes expérimentaux, nous avons transféré du sol provenant de plusieurs marais temporaires choisis comme un ensemble d'écosystèmes de référence. Quatre mois après le transfert de sol, la végétation des mésocosmes transférés a été comparée à celle issue uniquement de la colonisation spontanée (témoins). Les mésocosmes ayant subi un transfert de sol sont colonisés par la totalité des hydrophytes cibles transférées par le sol et présentent des communautés similaires à celles des écosystèmes de référence. Ils présentent d'autre part moins d'espèces jugées indésirables que les mésocosmes témoins. Même si la durée de l'étude ne nous permet pas de conclure définitivement sur la nécessité d'opérer un forçage de dispersion par transfert de sol, ces résultats préliminaires sont prometteurs pour une application à plus large échelle.

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“…Dispersion of organisms by water flow in macrophyte mats may increase the delivery of propagules in sites far from the area where the organisms originated (Barrat-Segretain, 1996). This type of dispersion can enhance invasive species success (Aznar et al, 2006). For example, the invasive zebra mussel (Dreissena polymorpha (Pallas, 1771)) disperses by uprooted and drifting fragments of the submersed macrophyte Vallisneria americana Michx.…”

Section: (With 2 Figures)mentioning

confidence: 99%

Aquatic macrophyte mats as dispersers of one invasive plant species

2017

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Association between aquatic vegetation and landscape indicators of human pressure

Cited by 48 publications

References 47 publications

Low survival after release into the wild: assessing “the burden of captivity” on Mallard physiology and behaviour

Low survival after release into the wild: assessing “the burden of captivity” on Mallard physiology and behaviour

Temporary wetland restoration after rice cultivation: is soil transfer required for aquatic plant colonization?

Aquatic macrophyte mats as dispersers of one invasive plant species

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