Modelling jay (Garrulus glandarius) abundance and distribution for oak regeneration assessment in Mediterranean landscapes

Pons, Josep; Pausas, Juli G.

doi:10.1016/j.foreco.2008.05.003

Cited by 34 publications

(21 citation statements)

References 26 publications

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“…On the other hand, and due to microclimatic and historical factors, these forests host a variable occurrence rate of Quercus spp. in their understory (mainly Q. ilex and Q. faginea, ICONA 1993; dispersed by jays (Garrulus glandarius) in the region, Gómez 2003;Pons and Pausas 2008;authors' personal observations). At any stage of its life, when Quercus spp.…”

Section: Study Site and Speciesmentioning

confidence: 99%

Valuing acorn dispersal and resprouting capacity ecological functions to ensure Mediterranean forest resilience after fire

et al. 2011

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Ecological processes within forests provide vital ecosystem services to society, most of which depend on the persistence of tree cover that can be altered after the impact of a disturbance. The aim of the present study was to examine the role of seed dispersal and resprouting that mediate resilience to large fires and evaluate the economic costs that these ecological functions provide. We used field data from 412 plots of the Spanish National Forest Inventory providing information on pre-and post-fire conditions of Mediterranean Pinus spp. and Quercus spp.-dominated forests. Then, we determined the need for restoration (N Rest ) and estimated the minimum pre-fire densities needed to ensure adequate post-fire cover. Economic valuations were assessed through three different scenarios (Sc) of possible human-management actions aimed at ensuring proper post-fire tree cover: Sc. 1) a prefire management scenario evaluating the costs of planting Quercus spp. seedlings in the understory, mimicking the whole dispersal function; Sc. 2) a pre-fire scenario in which enrichment plantations increased the densities of natural oaks; and Sc. 3) a post-fire scenario where the restoration is done through planting pines within the burned area. Approximately 90% of the burned area (371 out of 412 plots) was able to recover after fire supporting the view that Mediterranean forests are resilient to fire. This resilience was primarily mediated by biotic seed dispersal and posterior resprouting of tree species. These ecological functions saved between 626 and 1,326 €/ha compared to the human-management actions. Ensuring key ecological processes within forests increases forest resilience and recovery after fire leading to a generally significant saving of economic resources. In a perspective of increased future impact of disturbances and decrease availability of economic resources for forest management, the implications of the present study can be far reaching and extended to other forest planning exercises.

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Section: Study Site and Speciesmentioning

confidence: 99%

Valuing acorn dispersal and resprouting capacity ecological functions to ensure Mediterranean forest resilience after fire

et al. 2011

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“…). As jays are forest dwellers (Bossema , Pons and Pausas ), they tend to direct their dispersal towards areas with high tree cover, especially coniferous forest (Gómez , Pons and Pausas ). Our results show that once heterogeneous habitats were created after post‐fire management within the burnt plantation, oak seedling recruitment was positively associated to the habitats with standing live or dead trees.…”

Section: Discussionmentioning

confidence: 99%

Shifting demographic conflicts across recruitment cohorts in a dynamic post‐disturbance landscape

Leverkus

Benayas

Castro

2016

Ecology

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Seed dispersal effectiveness, which measures the number of adult plant individuals produced by seed dispersal, is the product of the number of seeds dispersed and the probability a seed produces an adult. Directed dispersal to certain habitat types may enhance some stages of recruitment but disfavor others, generating demographic conflicts in plant ontogeny. We asked whether temporal changes in habitat features may affect the distribution of seedlings recruited from dispersed acorns, and whether this could induce shifts in the life-stage conflicts experienced by successive cohorts of naturally recruited plants. As early successional habitats are characterized by rapid change, we used a burnt pine stand in southern Spain to monitor the recruitment and performance of a major tree species (Quercus ilex) across 7 yr in four types of post-fire habitats. These differed in structure and included patches of unburnt forest and three management alternatives of burnt trees: logging, partial cutting, and nonintervention. Young oaks that resprouted after the fire were mainly located near acorn sources, while new seedlings initially emerged mostly in habitats with standing snags due to habitat selection by European jays, Garrulus glandarius, for dispersal. The dead pines gradually collapsed and attracted less dispersal, so subsequent seedling cohorts mainly recruited within patches of unburnt pines. These live pines enhanced the survival of the oaks located beneath their canopy but greatly reduced their growth as compared to the other post-fire habitats, thus representing a demographic conflict that was absent elsewhere. As a consequence of the directional shift in the habitat where seedlings recruited, successive seedling cohorts experienced a gradual improvement in their likelihood of survival but a reduction in growth. The progressive intensification of this life-stage conflict hinged on the reduction of vertical structures in the habitat with standing burnt pines. Recruitment success thus involved temporal variation in the habitat where recruitment occurred, likely resulting from changes in the direction of seed dispersal, and spatial variation in habitat suitability for seedling establishment and growth. Temporal changes in habitat structure can indirectly change the environment in which recruitment occurs, and consequently seed dispersal effectiveness, by shifting the direction of seed dispersal.

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“…At a larger scale, improving habitat conditions of dispersers might also be considered. For example, maintaining some dense and homogenous pine areas intercalated with small agricultural fields may increase jay populations and by this the dispersion of acorns inside the pines if seed sources are available (Pons and Pausas, 2008). At stand-scale, silvicultural treatments such as thinnings or selection cuttings might be applied to modify stand structure and canopy attributes and by this favor the development of dispersed species.…”

Section: Forest Management Practices To Enhance Diversification Of Pumentioning

confidence: 99%

Management and estimate of forest utilization value in Piedmont

Brun¹,

Mosso²,

Blanc³

2015

Atti Del Secondo Congresso Internazionale Di Selvicoltura = Proceedings of the Second International Congress of Silviculture

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Quanto esposto è di esclusiva proprietà scientifica e intellettuale degli Autori ed esclude ogni responsabilità del curatore e dell'Editore. Intellectual and scientific property is exclusively of the authors of each contribution and does not entail responsibility of the editor and the publisher Con il patrocinio di / Under the Patronage of-Presidenza del Consiglio dei Ministri -Ministero delle politiche agricole alimentari e forestali -Ministero dei beni e delle attività culturali e del turismo -Ministero dell'ambiente e della tutela del territorio e del mare -Conferenza delle Regioni e delle Province Autonome -Expo Milano 2015 -La Toscana verso EXPO -Toscana Promozione -Università di Firenze -Consiglio per la Ricerca e la Sperimentazione in Agricoltura -Progetto Integral -Istituto Nazionale di Economia Agraria -GESAAF-Dipartimento di gestione dei sistemi agrari, alimentari e forestali dell'università di Firenze -Provincia di Firenze -Comune di Firenze -Accademia dei Georgofili -Consiglio dell'Ordine Nazionale dei dottori agronomi e dei Dottori Forestali (CONAF) -Società Italiana di Selvicoltura ed Ecologia Forestale (SISEF) -Unione Nazionale delle Accademie per le Scienze Applicate allo Sviluppo dell'Agricoltura, alla Sicurezza Alimentare ed alla Tutela Ambientale (UNASA) -Unione Zoologica Italiana Con il contributo di / SESSION 1 -ECOLOGY, BIODIVERSITY, GENETICS AND FOREST ADAPTATION PROCESSES TO CLIMATE CHANGE Chairpersons Marco Borghetti, Raffaello GianniniRelazioni Orali / Oral presentations Paffetti D., Fiorentini S., Vettori C., Bottalico F., Buonamici A., Maltoni A., Nocentini S., Giannini R., Travaglini D. -La struttura genetica spaziale della diversità genetica può essere utilizzata come indicatore di vetustà dei boschi di faggio? Primi risultati in Italia centrale - » 208 Lombardi F., Parisi F., Sciarretta A., Campanaro A., Tognetti R., Chirici G., Trematerra P., Marchetti M. -Relazioni tra struttura forestale, indicatori di naturalità e fauna saproxilica: un caso studio nell'abetina di "Abeti Soprani" (Molise) After a brief presentation of the policy and scientific debate on the concept of governance as applied to the forestry sector, the paper focuses on 5 statements: (1) the transition from conventional forms of government to new modes of governance is a very progressive process, and never a complete change; (2) the integration of the stakeholders and the public in decision-making processes still provides the main characteristic of governance systems as they presently work; (3) curiously, searching for"good" governance usually leads to a clear re-consideration of the importance of the traditional role of the State, which was never considered as an initial objective; (4) monitoring governance requires specific assessment framework for follow-up; (5) governance does not necessarily lead to sustainability (and vice-versa). Considering that both forest and forestry form a social-ecological system, the presentation calls for re-defining forest action as a process for adapting the objective of sustaina...

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Modelling jay (Garrulus glandarius) abundance and distribution for oak regeneration assessment in Mediterranean landscapes

Cited by 34 publications

References 26 publications

Valuing acorn dispersal and resprouting capacity ecological functions to ensure Mediterranean forest resilience after fire

Valuing acorn dispersal and resprouting capacity ecological functions to ensure Mediterranean forest resilience after fire

Shifting demographic conflicts across recruitment cohorts in a dynamic post‐disturbance landscape

Management and estimate of forest utilization value in Piedmont

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