Bird assemblages of an Iberian cereal steppe

Delgado, Ana; Moreira, Francisco

doi:10.1016/s0167-8809(99)00114-0

Cited by 80 publications

(80 citation statements)

References 11 publications

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“…Note that negative joint contribution of one variable in HP indicates that the other variables act as suppressor on the particular variable system. Fallow has been proved to be a preferred habitat for foraging in other farmland birds during summer (Henderson et al 2000a;Henderson et al 2000b), including many endangered species [e.g., Great Bustard Otis tarda (Moreira et al 2004), Little Bustard Tetrax tetrax, and Black-bellied Sandgrouse Pterocles orientalis (Delgado and Moreira 2000)]. Fallow is a particularly important habitat for farmland birds and, according to other studies, for other taxonomic groups (e.g., weed seeds, plants and invertebrates; see Henderson et al 2000a;Henderson et al 2000b;Van Buskirk and Willi 2004;Traba et al 2008), acting like reservoirs of farmland biodiversity.…”

Section: Discussionmentioning

confidence: 99%

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The role of fallow in habitat use by the Lesser Kestrel during the post-fledging period: inferring potential conservation implications from the abolition of obligatory set-aside

et al. 2009

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International audienceThe maintenance of fallows has been shown to prevent the loss of farmland biodiversity caused by agricultural intensification. These are mainly introduced as part of both obligatory and voluntary set-aside schemes. However, the obligatory set-aside has recently been abolished by the Common Agricultural Policy Health Check. In this study, we examine the role of fallow in fine-grained habitat use by a threatened farmland bird (Lesser Kestrel) during summer in northwestern Spain. To analyze Lesser Kestrel occurrence, we used generalized linear models, a theoretic-information approach and a hierarchical partitioning analysis. The best AIC-based models explaining occurrence of Lesser Kestrels showed that fallow was the more important habitat type followed, to a lesser extent, by dry cereal stubble and field margin. In contrast, irrigated crops negatively influenced occurrence. Heterogeneity of crop mosaic was not important in explaining occurrence of Lesser Kestrel. Fallows, like dry cereal stubbles and field margins, seem to be suitable for foraging given the abundance of high food resources and their availability due to shorter vegetation cover. The abolition of the obligatory set-aside could reduce the total surface of fallow land (approximately 40.9%), likely affecting habitat use by Lesser Kestrel through an increase of other non-preferred crops (e.g., irrigated crops) or by decreasing food resources. Agri-environment schemes focusing on the maintenance of low-intensive farming systems with a mosaic of crops and semi-natural habitats interspersed should be promoted in premigratory areas to maintain Lesser Kestrel

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Section: Discussionmentioning

confidence: 99%

“…Numerous studies on habitat use in migratory farmland birds have shown that fallow is an important habitat during the breeding and winter seasons (e.g., Delgado and Moreira 2000;Silva et al 2004;Wretenberg et al 2007). Whether fallow is also important during the post-fledging period is not known.…”

Section: Communicated By W Lutzmentioning

confidence: 99%

The role of fallow in habitat use by the Lesser Kestrel during the post-fledging period: inferring potential conservation implications from the abolition of obligatory set-aside

et al. 2009

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“…It is a mosaic landscape, consisting mainly of cereal fields, stubble, ploughed and fallow land (usually used as pastures) and is based on extensive cultivation of cereals in a rotation scheme. Although marginal, with yields less than half the average yield in the European Union (Suárez et al, 1997), the importance of this human dominated landscape, as one of the last refuges for many steppic birds, such as the great bustard (Otis tarda L.), the little bustard (Tetrax tetrax L.), and the lesser kestrel (Falco naumanni Fleischer) is widely recognized (Tucker and Heath, 1994;Delgado and Moreira, 2000).…”

Section: The Case Studymentioning

confidence: 99%

Testing for the survey mode effect on contingent valuation data quality: A case study of web based versus in-person interviews

Marta-Pedroso¹,

Freitas²,

Domingos³

2007

Ecological Economics

161

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This paper addresses the lack of empirical evaluation of the use of web based surveys in the context of contingent valuation surveys. We compare, using a case study, in-person interviews with web based surveys regarding response rate, information additivity effects and respondents' attitudes towards paying. The web based survey had a much lower response (5.1%) than the in-person interviewing (84%). We find the web based contingent valuation surveys to be neither more susceptible to information additivity effects nor more prone to zero protest responses. We conclude in favor of the use of web based surveys, IntroductionThe contingent valuation method (CVM) is a stated preference method 1 for valuing changes in the provision of nonmarketable goods (e.g. environmental amenities). The method was conceptually proposed by CiriacyWantrup in 1947, but the first empirical application only took place in 1961 with Robert Davis, in the US (Jackobsson and Dragun, 1996; Venkatachalam, 2004). The contingent valuation method rose to high prominence in the 1980s and in the last two decades has been routinely used in the appraisal of projects with impact on the environment. Its potential to capture both use and non-use values of environmental assets and the flexibility of its application largely contributed to its massive use (Carson, 2000).Basically, CVM is a survey-based methodology which relies on obtaining monetary estimates for the economic value of a specified change in the provision of the environmental good of interest, which typically is not traded in the conventional markets. Hence CVM application consists in the construction of hypothetical markets (also called elicitation scenarios) where the individuals' valuation of the good is elicited. Monetary estimates are obtained either as individuals' Willingness to Pay (WTP) or Willingness to Accept (WTA). WTP measures the amount of income a person is willing to forego in exchange for an improved state of an environmental good. E-mail address: cristina.marta@ist.utl.pt (C. Marta-Pedroso). 1 Stated preference, or direct, methods employ constructed markets in an experimental setting to elicit individuals' preferences. Other stated preference valuation approaches include contingent ranking, contingent choice and conjoint analysis (see Boxall et al., 1996, for a comprehensive comparison of the various stated preference approaches).

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“…The agricultural mosaic that is created under this regime seems to be important to maintain high levels of farmland biodiversity (Suárez, Naveso & De Juana 1997, Delgado & Moreira 2000. In modern farming systems, nitrogen fertilizers are used to maintain soil fertility, and thus there is little reason to keep the rotational cropping system.…”

Section: Fallows and Set-asidesmentioning

confidence: 99%

Ecological effects of game management: does supplemental feeding affect herbivory pressure on native vegetation?

et al. 2015

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Context Supplemental feeding of large mammalian herbivores is a common management tool mainly aimed at promoting healthy populations and at increasing productivity and trophy sizes. Such management measure may indirectly affect herbivore effects on plant communities through altered foraging patterns. The quantification of the ecological effects of large herbivore management is important for designing holistic management and conservation programs. Aims Here we aimed at quantifying the ecological effects of supplemental feeding of Iberian red deer, Cervus elaphus hispanicus, on the composition of and on the browsing effects on Mediterranean woody plant community. Methods An experiment was set up in a hunting rangeland located in central Spain, where female deer were kept in enclosures with either exclusive access to natural forages or with additional ad libitum access to a nutritionally rich concentrate. The experiment also included a control area where deer were absent. Key results We observed significant differences in browsing impacts among the supplemented, non-supplemented and control areas, and such effect varied for the different plant species. Plant species which nutritional content complemented that of fodder were more highly consumed, for instance, Erica spp., which digestible fibre content is higher and N content lower than that of provided fodder. The presence of deer and the concentrate supplied, instead, did not influence the relative abundances of shrub species. Conclusions Artificial supplemental feeding provided to ungulates led to increased browsing on plant species which nutritional composition complemented that of the supplement provided. Implications So as to alleviate herbivory impact on all shrubs, we suggest that composition of supplemental feeding should adjust both to the natural forage availability and quality and to ungulate requirements across seasons.

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Bird assemblages of an Iberian cereal steppe

Cited by 80 publications

References 11 publications

The role of fallow in habitat use by the Lesser Kestrel during the post-fledging period: inferring potential conservation implications from the abolition of obligatory set-aside

The role of fallow in habitat use by the Lesser Kestrel during the post-fledging period: inferring potential conservation implications from the abolition of obligatory set-aside

Testing for the survey mode effect on contingent valuation data quality: A case study of web based versus in-person interviews

Ecological effects of game management: does supplemental feeding affect herbivory pressure on native vegetation?

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