Landscape effects on jay foraging behavior decrease acorn dispersal services in dehesas

Morán‐López, Teresa; Alonso, César L.; Dı́az, Mario

doi:10.1016/j.actao.2015.07.006

Cited by 40 publications

(28 citation statements)

References 45 publications

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“…According to A.S. Watt, ''a grassy surface seems the natural seedbed of oak, for very successful examples may often be seen on rough pasture adjoining woods which for some reason or other has been allowed to lie waste or is only slightly stocked with cattle during the summer'' (Watt 1919, p. 175). Numerous later studies support that observation, revealing successful oak regeneration in grassdominated vegetation with scattered trees or shrubs (e.g., Kollmann and Schill 1996;Kuiters and Slim 2003;Minotta and Degioanni 2011;Perea et al 2011a), particularly in the neighbourhood of forest/woodland edges or hedgerows (e.g., Herlin and Fry 2000;Olrik et al 2012;Morán-López et al 2015). As suggested by Bobiec et al (2011b) this may be due to the grassy sod preventing the access to soil seedbed by light wind-born seeds and therefore retarding succession and favouring slow and gradual regeneration of trees and shrubs from heavier seeds brought by animals, including oaks and fruit woody species.…”

Section: Germination and Early Seedling Growthmentioning

confidence: 84%

“…In the case of holm oak Quercus ilex woodlands in the Iberian Peninsula, Morán-López et al (2015) revealed that increasing forest fragmentation and insufficient shrub cover (under 65%) outside forest have changed the rodents' influence on oak regeneration. Their positive net effect (seed dispersal and caching) became overwhelmed by the negative effect (seed consumption).…”

Section: Seed Dispersalmentioning

confidence: 99%

“…With the constant potential range of the acorn dispersal, i.e., up to 4 km (Kollmann and Schill 1996;Vander Wall 2001;Olrik et al 2012), the realized distance from parent trees to caching sites depends on the individual landscape characteristics (Gómez 2003). Jays prefer non-forest habitats to closed tree canopy for caching, particularly if there are vertical structures that can be used as navigation beacons (Kollmann and Schill 1996;Herlin and Fry 2000), and diversified with forest patches (Morán-López et al 2015). There is a strong correspondence between the Jay habitat selectivity and the Table 2).…”

Section: Seed Dispersalmentioning

confidence: 99%

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Seeing the oakscape beyond the forest: a landscape approach to the oak regeneration in Europe

2018

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Context Intensification and specialisation of agriculture and forest use has led to profound structural and compositional changes in European landscapes. In particular, sharp, narrow edges adjacent to relatively homogenous vegetation types progressively replace transitional habitats, crucial for a plethora of species and ecological processes. Quercus robur and Q. petraea regeneration niches make them best adapted to such transitional habitats. However, contemporary oaks' importance, including their regeneration, is usually considered within limits of forest habitats. Objective Defining habitats, landscape patterns and processes fostering oak regeneration and 'oakscape' development. Methods We assessed the state-of-the art of the topical literature with respect to various aspects of oak regeneration based on a refined list of 234 titles from the Web of Science database. Results The review confirmed that the vast majority of studies focus on forest habitats, disregarding the fact that substantial part of acorns are being carried away and seeded by birds in non-forest habitats. Conclusions The common acceptance of the simplistic landscape mosaic model, based on segregated homogenous vegetation categories and clear-cut lines separating patches, impedes proper assessment of landscape changes, referring to 'untypical', transitional habitats-the true oaks' domain. Hence, restoring and sustaining European 'oakscape' should result from the overall landscape management, based on a better adapted gradient approach to landscape studies. Applying such an approach, we identified a set of habitats fostering successful oak regeneration and recruitment without direct human support, contributing to the contemporary 'oakscape', represented mostly by non-forest, either natural or anthropogenic habitats.

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Section: Germination and Early Seedling Growthmentioning

confidence: 84%

Section: Seed Dispersalmentioning

confidence: 99%

Section: Seed Dispersalmentioning

confidence: 99%

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Seeing the oakscape beyond the forest: a landscape approach to the oak regeneration in Europe

2018

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“…The Eurasian jay plays a central role in acorn dispersal dynamics of oak forests (Bossema , Gómez , Pons and Pausas , , Morán‐López et al. , Leverkus et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…The Eurasian jay plays a central role in acorn dispersal dynamics of oak forests (Bossema 1979, G omez 2003, Pons and Pausas 2007b, Mor an-L opez et al 2015, Leverkus et al 2016. However, in strongly deforested farmland of the Mediterranean landscapes where jays are very scarce or absent (Bossema 1979, Pons and Pausas 2008, Gianpasquale and Alberto 2019, recruitment of oak juveniles has often been observed at long distances (above several tens of meters) from remnant oak trees and small forest patches (Andivia et al 2017 and authors' observations).…”

Section: Introductionmentioning

confidence: 99%

Massive and effective acorn dispersal into agroforestry systems by an overlooked vector, the Eurasian magpie (Pica pica)

et al. 2019

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Oak regeneration and the expansion of forested sites in Eurasia rely on acorn dispersal by animals, especially the Eurasian jay (Garrulus glandarius). However, in open agroforestry systems where jays are absent, such as old fields far from acorn sources, oak recruitment still occurs. We hypothesize that the Eurasian magpie (Pica pica), an abundant corvid in this system, substitutes the jay in its seed dispersal function. By ringing 169 magpies, video recording >7500 acorn removal events with trail cameras, and radio‐tagging 337 acorns, we quantified that (1) magpies cached 41–56% of the annual acorn production of Quercus ilex trees in single caches on the ground; (2) breeding pairs, and especially males, were the main acorn dispersers; (3) each breeding magpie cached 169–1372 acorns in 6 weeks; and (4) the effectiveness of dispersal (percentage of cached acorns resulting in seedlings) was 0.6–2.4%, which (5) yielded a high density of emerged seedlings (56–439 seedlings/ha). We evidence that magpie could be a key species in the regeneration of oak agroforestry mosaics because they massively and effectively dispersed acorns. However, in our particular study site, effectiveness was low probably due to herbivory and summer drought stress (i.e., a context limitation rather than an intrinsic limitation of the disperser). As the distributions of magpies and oaks overlap widely in Eurasia, effective acorn dispersal by magpies could have a significant role in large‐scale oak forest recovery in strongly fragmented landscapes.

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Bird Diversity in Mediterranean Pine and Mixed Forests

Dı́az

Soliño

Martínez‐Jauregui³

2021

Pines and Their Mixed Forest Ecosystems in the Mediterranean Basin

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Landscape effects on jay foraging behavior decrease acorn dispersal services in dehesas

Cited by 40 publications

References 45 publications

Seeing the oakscape beyond the forest: a landscape approach to the oak regeneration in Europe

Seeing the oakscape beyond the forest: a landscape approach to the oak regeneration in Europe

Massive and effective acorn dispersal into agroforestry systems by an overlooked vector, the Eurasian magpie (Pica pica)

Bird Diversity in Mediterranean Pine and Mixed Forests

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