scholarly journals Increased songbird nest depredation due to Aleppo pine (Pinus halepensis) encroachment in Mediterranean shrubland

2019 ◽  
Author(s):  
Asaf Ben-David ◽  
Hila Shamoon ◽  
Ido Izhaki ◽  
Roni Efronny ◽  
Roi Maor ◽  
...  
Keyword(s):  
Vegetation Structure ◽  
Nest Predation ◽  
Pinus Halepensis ◽  
Indirect Evidence ◽  
Nesting Success ◽  
Aleppo Pine ◽  
Occurrence Rate ◽  
Mediterranean Shrublands ◽  
Mediterranean Shrubland ◽  
Nest Depredation

Abstract Background In recent decades, a decrease of passerine densities was documented in Mediterranean shrublands. At the same time, a widespread encroachment of Aleppo pines ( Pinus halepensis ) to Mediterranean shrubland occurred. Such changes in vegetation structure may affect passerine predator assemblage and densities, and in turn impact passerine densities. Depredation during the nesting season is an important factor to influence passerine population size. Understanding the effects of changes in vegetation structure (pine encroachment) on passerine nesting success is the main objective of this study. We do so by assessing the effects of Aleppo pine encroachment on Sardinian warbler ( Sylvia melanocephala ) nest depredation in Mediterranean shrublands. Methods We examined direct and indirect predation pressures through a gradients of pine density, using four methods: (1) placing dummy nests; (2) acoustic monitoring of mobbing events; (3) direct observations on nest predation using cameras; and (4) observation of Eurasian jay ( Garrulus glandarius ) behaviour as indirect evidence of predation risk. Results We found that Aleppo pine encroachment to Mediterranean shrublands increased nest predation by Eurasian jays. Nest predation was highest in mixed shrubland and pines. These areas are suitable for warblers but had high occurrence rate of Eurasian jays. Conclusions Encroaching pines directly increase activity of Eurasian jays in shrubland habitats, which reduced the nesting success of Sardinian warblers. These findings are supported by multiple methodologies, illustrating different predation pressures along a gradient of pine densities in natural shrublands. Management of Aleppo pine seedlings and removal of unwanted trees in natural shrubland might mitigate arrival and expansion of predators and decrease the predation pressure on passerine nests.

scholarly journals Increased songbird nest depredation due to invasive Aleppo pine (Pinus halepensis) encroachment in Mediterranean shrubland

2019 ◽  
Author(s):  
Asaf Ben-David ◽  
Hila Shamoon ◽  
Ido Izhaki ◽  
Roni Efronny ◽  
Roi Maor ◽  
...  
Keyword(s):  
Vegetation Structure ◽  
Nest Predation ◽  
Pinus Halepensis ◽  
Indirect Evidence ◽  
Nesting Success ◽  
Aleppo Pine ◽  
Occurrence Rate ◽  
Mediterranean Shrublands ◽  
Mediterranean Shrubland ◽  
Nest Depredation

Abstract Background In recent decates, a decrease of passerine densities was documented in Mediterenean shrublands. At the same time, a widspread encroachment of Aleppo pines (Pinus halepensis) to Mediterranean shrubland occurred. Such changes in vegetation structure may effect passerine predator assemblage and densities, and in turn impact passerine densities. Depredation during the nesting season is an important factor to influence passerine population size. Understanding the effects of changes in vegetation structure (pine encroachment) on passerine nesting success is the main objective of this study. We do so by assesing the effects of Aleppo pine encroachment on Sardinian warbler (Sylvia melanocephala) nest depredation in Mediterranean shrublands. Methods We examined direct and indirect predation pressures throught a gradients of pine density, using four methods: (1) placing dummy nests; (2) acoustic monitoring of mobbing events; (3) direct observations on nest predation using cameras; and (4) observation of Eurasian jay (Garrulus glandarius) behaviour as indirect evidence of predation risk. Results We found that Aleppo pine encroachment to Mediterranean shrublands increased nest predation by Eurasian jays. Nest predation was highest in with median encroaching pine. These areas are suitable for warblers, but had high occurrence rate of Eurasian jays. Conclusions Invasive pines directly increase activity of avian predators in shrubland habitats which impacted shrubland songbird nesting success. These findings are supported by multiple methodologies, illustrating different predation pressures along a gradient of pine densities in natural shrublands. Management of Aleppo pine seedlings and removal of unwanted trees in natural shrubland might mitigate arrival and expansion of native-invasive predators and decrease the predation pressure on passerine nests.

scholarly journals Increased songbird nest depredation due to Aleppo pine (Pinus halepensis) encroachment in Mediterranean shrubland

BMC Ecology ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Asaf Ben-David ◽  
Hila Shamon ◽  
Ido Izhaki ◽  
Ronny Efronny ◽  
Roi Maor ◽  
...  
Keyword(s):  
Vegetation Structure ◽  
Nest Predation ◽  
Pinus Halepensis ◽  
Indirect Evidence ◽  
Nesting Success ◽  
Aleppo Pine ◽  
Occurrence Rate ◽  
Mediterranean Shrublands ◽  
Mediterranean Shrubland ◽  
Nest Depredation

Abstract Background In recent decades, a decrease of passerine densities was documented in Mediterranean shrublands. At the same time, a widespread encroachment of Aleppo pines (Pinus halepensis) to Mediterranean shrubland occurred. Such changes in vegetation structure may affect passerine predator assemblage and densities, and in turn impact passerine densities. Depredation during the nesting season is an important factor to influence passerine population size. Understanding the effects of changes in vegetation structure (pine encroachment) on passerine nesting success is the main objective of this study. We do so by assessing the effects of Aleppo pine encroachment on Sardinian warbler (Sylvia melanocephala) nest depredation in Mediterranean shrublands. We examined direct and indirect predation pressures through a gradients of pine density, using four methods: (1) placing dummy nests; (2) acoustic monitoring of mobbing events; (3) direct observations on nest predation using cameras; and (4) observation of Eurasian jay (Garrulus glandarius) behaviour as indirect evidence of predation risk. Results We found that Aleppo pine encroachment to Mediterranean shrublands increased nest predation by Eurasian jays. Nest predation was highest in mixed shrubland and pines. These areas are suitable for warblers but had high occurrence rate of Eurasian jays. Conclusions Encroaching pines directly increase activity of Eurasian jays in shrubland habitats, which reduced the nesting success of Sardinian warblers. These findings are supported by multiple methodologies, illustrating different predation pressures along a gradient of pine densities in natural shrublands. Management of Aleppo pine seedlings and removal of unwanted trees in natural shrubland might mitigate arrival and expansion of predators and decrease the predation pressure on passerine nests.

scholarly journals Increased songbird nest depredation due to Aleppo pine (Pinus halepensis) encroachment in Mediterranean shrubland

2019 ◽  
Author(s):  
Asaf Ben-David ◽  
Hila Shamon ◽  
Ido Izhaki ◽  
Roni Efronny ◽  
Roi Maor ◽  
...  
Keyword(s):  
Vegetation Structure ◽  
Nest Predation ◽  
Pinus Halepensis ◽  
Indirect Evidence ◽  
Nesting Success ◽  
Aleppo Pine ◽  
Occurrence Rate ◽  
Mediterranean Shrublands ◽  
Mediterranean Shrubland ◽  
Nest Depredation

Abstract Background In recent decades, a decrease of passerine densities was documented in Mediterranean shrublands. At the same time, a widespread encroachment of Aleppo pines ( Pinus halepensis ) to Mediterranean shrubland occurred. Such changes in vegetation structure may affect passerine predator assemblage and densities, and in turn impact passerine densities. Depredation during the nesting season is an important factor to influence passerine population size. Understanding the effects of changes in vegetation structure (pine encroachment) on passerine nesting success is the main objective of this study. We do so by assessing the effects of Aleppo pine encroachment on Sardinian warbler ( Sylvia melanocephala ) nest depredation in Mediterranean shrublands. We examined direct and indirect predation pressures through a gradients of pine density, using four methods: (1) placing dummy nests; (2) acoustic monitoring of mobbing events; (3) direct observations on nest predation using cameras; and (4) observation of Eurasian jay ( Garrulus glandarius ) behaviour as indirect evidence of predation risk. Results We found that Aleppo pine encroachment to Mediterranean shrublands increased nest predation by Eurasian jays. Nest predation was highest in mixed shrubland and pines. These areas are suitable for warblers but had high occurrence rate of Eurasian jays. Conclusions Encroaching pines directly increase activity of Eurasian jays in shrubland habitats, which reduced the nesting success of Sardinian warblers. These findings are supported by multiple methodologies, illustrating different predation pressures along a gradient of pine densities in natural shrublands. Management of Aleppo pine seedlings and removal of unwanted trees in natural shrubland might mitigate arrival and expansion of predators and decrease the predation pressure on passerine nests.

scholarly journals Vegetation Composition in a Post-Fire Successional Gradient of Pinus Halepensis Forests in Attica, Greece

1996 ◽  
Vol 6 (2) ◽  
pp. 83 ◽  
Author(s):  
D Kazanis ◽  
M Arianoutsou
Keyword(s):  
Vegetation Structure ◽  
Mediterranean Climate ◽  
Pinus Halepensis ◽  
Life Forms ◽  
Aleppo Pine ◽  
Pine Forests ◽  
Vegetation Composition ◽  
Climate Data ◽  
Relative Contribution ◽  
Second Year

The vegetation composition of a post-fire succession in Aleppo pine forests of Attica, Greece, was studied by a synchronic method. The sites form a post-fire chronosequence and have typical Mediterranean climate. Data on the flora of the burned sites, growth and life forms of the various plant taxa, as well as on vegetation structure are provided. The burned ecosystems recovered quite rapidly. During the first four years of the post-fire succession, herbaceous taxa dominate the flora of the forests, peaking at the second year. After 15 years little change in the vegetation was observed. The richest family in terms of the number of taxa was the Leguminosae, especially in the two first years of succession. Most of these taxa were herbaceous. The relative contribution of legumes to the flora after two years is gradually restricted.

Tree ring to climate relationships of Aleppo pine (Pinus halepensis Mill.) in Greece

2001 ◽  
Vol 27 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Andreas Papadopoulos ◽  
Françoise Serre-Bachet ◽  
Lucien Tessier
Keyword(s):  
Tree Ring ◽  
Pinus Halepensis ◽  
Aleppo Pine

Frost hardening and resistance in three Aleppo pine (Pinus halepensis Mill.) provenances

2001 ◽  
Vol 49 (3) ◽  
pp. 179-186
Author(s):  
ELENA PAOLETTI ◽  
ROBERTO CALAMASSI ◽  
SARA STRATI
Keyword(s):  
Pinus Halepensis ◽  
Aleppo Pine ◽  
Frost Hardening

scholarly journals Structural variability of Aleppo pine stands in two forests in northeastern Algeria

2020 ◽  
Vol 21 (6) ◽  
Author(s):  
Malika Rached Kanouni ◽  
Insaf Hani ◽  
Ratiba BOUSBA ◽  
Amina Beldjazia ◽  
Hichem KHAMAR
Keyword(s):  
Pinus Halepensis ◽  
Small Diameter ◽  
Basal Area ◽  
Aleppo Pine ◽  
Regeneration Rate ◽  
Tree Diameter ◽  
Total Height ◽  
Structural Variability ◽  
Pine Stands ◽  
Northeastern Algeria

Abstract. Rached-Kanouni M, Hani I, Bousba R, Beldjazia A, Khammar H. 2020. Structural variability of Aleppo pine stands in two forests in northeastern Algeria. Biodiversitas 21: 2848-2853. The layout of the stand can be described as the width of the trees, their reciprocal locations, diametric distinction and height. The goal of this study is to recognize changes in the Pinus halepensis spatial and demographic systems in two Beni Oudjana and Chettaba Forests, located in northeast Algeria. An inventory of trees in these forest formations with P. halepensis dominance was carried out based on dendrometric parameters such as total height, tree diameter at dbh ≥ 5 cm, basal area, total volume, etc., as well as the number of trees in the forest. Tree diameter and height measurements were made on 12 rectangular plots (20 m × 20 m), located in both forests. The results obtained show that the mean stand density, mean diameter, basal area and total volume are higher in Chettaba Forest, the values attributed to these parameters are respectively (422 trees/ha, 27.07 cm, 26, 86 m2, 251.63 m3); while the total height and regeneration rate show significantly higher values in Beni Oudjana Forest (18.97 m, 607 individuals/ha). The structure in diameter and height of the species is bell-shaped to asymmetrically positive with a predominance of small diameter individuals in the Chettaba forest. On the other hand, in the Beni Oudjana Forest, the structure is ‘L’ shaped, showing a predominance of very small diameter individuals. These results indicate that the low regeneration rate of P. halepensis in the Chettaba Forest is due to anthropogenic pressures that favor the degradation of this forest.

Sign in / Sign up

Export Citation Format

Share Document