scholarly journals A NEST PREDATOR'S VIEW OF A MANAGED FOREST: GRAY JAY (PERISOREUS CANADENSIS) MOVEMENT PATTERNS IN RESPONSE TO FOREST EDGES

The Auk ◽  
2004 ◽  
Vol 121 (1) ◽  
pp. 162 ◽  
Author(s):  
Jacques Ibarzabal ◽  
André Desrochers
The Auk ◽  
2004 ◽  
Vol 121 (1) ◽  
pp. 162-169 ◽  
Author(s):  
Jacques Ibarzabal ◽  
André Desrochers

Abstract High nest-predation risk is often associated with forest edges. Most nest predators in boreal coniferous forests of North America are forest specialists living in mature stands. Nest predators have been studied mainly through use of artificial nests; knowledge of their behavior remains limited. We used radiotelemetry to examine movement patterns, relative to forest edge, of a forest nest predator, the Gray Jay (Perisoreus canadensis), in boreal coniferous forest. Each of 11 family groups of Gray Jays monitored in early summer exhibited a marked association with forest edges. Jays were found within 30 m of the forest edges more often than expected from random use of mature forest. Furthermore, jays traveled more slowly near forest edges than in the forest interior. Because forest edges apparently represent prime foraging habitat for Gray Jays, narrow forest strips left by logging could act as ecological traps for mature-stand songbirds before stands regenerate in adjacent clearcuts.


2001 ◽  
Vol 15 (1) ◽  
pp. 173-183 ◽  
Author(s):  
David J. Flaspohler ◽  
Stanley A. Temple ◽  
Robert N. Rosenfield

2017 ◽  
Vol 107 (5) ◽  
pp. 563-572 ◽  
Author(s):  
K.W. Bähner ◽  
K.A. Zweig ◽  
I.R. Leal ◽  
R. Wirth

AbstractForest fragmentation and climate change are among the most severe and pervasive forms of human impact. Yet, their combined effects on plant–insect herbivore interaction networks, essential components of forest ecosystems with respect to biodiversity and functioning, are still poorly investigated, particularly in temperate forests. We addressed this issue by analysing plant-insect herbivore networks (PIHNs) from understories of three managed beech forest habitats: small forest fragments (2.2–145 ha), forest edges and forest interior areas within three continuous control forests (1050–5600 ha) in an old hyper-fragmented forest landscape in SW Germany. We assessed the impact of forest fragmentation, particularly edge effects, on PIHNs and the resulting differences in robustness against climate change by habitat-wise comparison of network topology and biologically realistic extinction cascades of networks following scores of vulnerability to climate change for the food plant species involved. Both the topological network metrics (complexity, nestedness, trophic niche redundancy) and robustness to climate change strongly increased in forest edges and fragments as opposed to the managed forest interior. The nature of the changes indicates that human impacts modify network structure mainly via host plant availability to insect herbivores. Improved robustness of PIHNs in forest edges/small fragments to climate-driven extinction cascades was attributable to an overall higher thermotolerance across plant communities, along with positive effects of network structure. The impoverishment of PIHNs in managed forest interiors and the suggested loss of insect diversity from climate-induced co-extinction highlight the need for further research efforts focusing on adequate silvicultural and conservation approaches.


2016 ◽  
Vol 1 ◽  
pp. 328-336
Author(s):  
Abdul Basit

Based on the results of research that conducted by previous researchers suggest that the schools are the institutions most vulnerable to enter the radical religious ideology. Many factors could be cause this to happen. The lack regulation of the process of Islamic religious education in the schools, psychological conditions adolescentare unstable and looking for identity, the lack of religious comprehension in the students, and the religious organizations that entered to school institutions with a various of ideologies very easy, are part of the factors that cause vulnerability school institute from radical religious comprehension. In the respect to these conditions are required the model of the da’wa movement that can be accepted by adolescent and it be an alternative in the development of da’wa in the schools.To get the data, the authors conducted a qualitative study in the area of ​​Purwokerto using the phenomenological approach. The researchers conducted interviews and focus group discussions with the school leaders, teachers, students, activists of religious organizations, and religious leaders who understand the problems in this study. The main data is processed by combining the results of the observation and study of literature through a phenomenological approach that emphasizes the meaning behind the phrases or statements from informan.To produce the movement patterns of school da’wathat can be acceptable to all the communities in the schools, the school needs to make the movement patterns of integratif school da’wa,both intra-curricular, co-curricular and extra-curricularactivities. The religious activities and cultivation of religious values ​​are part of the process of da’wa that do not separated in the schools. In the practice of this the movement patterns, the school should pay attention to the characteristics of the school, students' backgrounds, as well as involvedstakeholders and the da’wa organizations.


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