Negative Effects of Snow Cover on Foraging Habitat Selection and Breeding Success in the Red-Billed Chough Pyrrhocorax pyrrhocorax

Ardeola ◽  
2021 ◽  
Vol 69 (1) ◽  
Author(s):  
Philippe Fontanilles ◽  
Ismaël Boulicot ◽  
Jules Chiffard-Carricaburu
2019 ◽  
Vol 28 (10) ◽  
pp. 2669-2685 ◽  
Author(s):  
Jaime Resano-Mayor ◽  
Fränzi Korner-Nievergelt ◽  
Sergio Vignali ◽  
Nathan Horrenberger ◽  
Arnaud G. Barras ◽  
...  

Author(s):  
Svein Dale

AbstractIn boreal forests, food supplies typically have cyclic variations, and many species here fluctuate in numbers from year to year. One group of species showing large variations in population size is birds specialized on seeds from masting trees. Here, I analyze spatial patterns of a mass occurrence and habitat selection of the Common Redpoll (Carduelis flammea) during the breeding season in southeastern Norway in 2020 after a year with large seed crops from Norway Spruce (Picea abies) and Downy Birch (Betula pubescens). I found that Common Redpoll numbers increased with elevation and towards the northwest. Numbers were also strongly and positively correlated with snow depth in early April when snow was present mainly above 400 m elevation. Sites with snow cover in early April (30% of all sites) held 96.4% of all individuals recorded. Field observations indicated that Common Redpolls foraged extensively for spruce seeds on the snow until the end of May when young were independent. I suggest that the mass occurrence was due to a unique combination of exceptionally large seed crops of two tree species coinciding in the same year. The masting produced large amounts of food both for overwintering (birch seeds) and for breeding (spruce seeds), and during the breeding season snow cover facilitated access to food resources. Dependency of Common Redpolls on snow cover suggests that climate change may negatively impact some seed-eaters in boreal regions. On the other hand, higher temperatures may induce more frequent masting which may be beneficial for seed-eaters. Thus, climate change is likely to lead to complex ecosystem changes in areas where snow cover may disappear.


PLoS ONE ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. e53077 ◽  
Author(s):  
Sophie Monsarrat ◽  
Simon Benhamou ◽  
François Sarrazin ◽  
Carmen Bessa-Gomes ◽  
Willem Bouten ◽  
...  

2011 ◽  
Vol 21 (3) ◽  
pp. 342-352 ◽  
Author(s):  
MARTA LOPEZ-DARIAS ◽  
JAVIER LUZARDO ◽  
RAFAEL MARTÍNEZ ◽  
DANIEL GONZÁLEZ ◽  
EDUARDO A. GARCÍA ◽  
...  

SummaryNegative effects of poaching on seabird populations are not usually evaluated quantitatively when assessing seabird colony conservation status, nor are they generally considered a major concern. We demonstrate that poaching is still intense in the Canary Islands, and has negative consequences for the conservation of seabird colonies. We quantified the effects of poaching of Cory’s Shearwater fledglings on breeding success on different islands in the Canaries, comparing colonies that suffer from intense, medium, or no poaching. Poaching reduced the breeding success of affected colonies to almost a third, potentially causing the future extinction of the colony. Only colonies with intense wardening campaigns reached high values of reproductive success, showing that government surveillance in conjunction with volunteers from different NGOs is a very effective approach in reducing poaching. A population sensitivity analysis was also conducted to provide data on the factors that most affect the performance of the model. Although population growth and mean final population size varied with increases and decreases in mortality and carrying capacity, only harvesting resulted in a probability of 100% of extinction in 20–40 years. To promote seabird conservation in regions such as the Canary Islands, a core archipelago for seabird species in the Atlantic, poaching control should be elevated by society to a level of urgency, requiring dedicated funding and mobilisation of experts and volunteers to adequately address it through education, prevention and enforcement.


2010 ◽  
Vol 56 (3) ◽  
pp. 579-589 ◽  
Author(s):  
LISA DESSBORN ◽  
JOHAN ELMBERG ◽  
GÖRAN ENGLUND

Ibis ◽  
2019 ◽  
Vol 162 (2) ◽  
pp. 505-519
Author(s):  
Arnaud G. Barras ◽  
Sophie Marti ◽  
Sarah Ettlin ◽  
Sergio Vignali ◽  
Jaime Resano‐Mayor ◽  
...  

2020 ◽  
Vol 47 (4) ◽  
pp. 349
Author(s):  
Philippa Agnew ◽  
David M. Houston

Abstract ContextTourism operations that provide the opportunity for wildlife viewing can support conservation management through public education, habitat protection, population management, research activities and revenue generation. However, alongside these potential benefits there can be negative effects on the species that include the possibility of reduced breeding success, survival and, subsequently, population growth. AimWe sought to establish whether a tourism operation affected little penguins Eudyptula minor by comparing reproductive and survival parameters of two managed populations in Oamaru, New Zealand. One population was the focus of a tourism operation, whereas the other (located nearby) did not provide any public access. The tourism operation implemented strategies to reduce human disturbance, including the reduction of noise, light and movement from visitors during viewing, and by ensuring that visitors were restricted to designated viewing areas. MethodsNesting boxes were installed at both colonies that facilitated weekly monitoring of the populations. The monitoring program (1993–2017) included weekly checks of every nesting box in the colony for the presence of eggs, chicks and adults. Chicks were weighed before fledging, and both fledglings and breeding adults were individually marked. Key resultsLay dates, breeding success, chick fledge mass and survival rates were not measurably different between the two populations, indicating that there was little evidence of negative effects on the penguins at the tourist site. ConclusionsThe slight differences observed between the colonies during the time series were attributed to environmental damage sustained at the non-tourist site and a difference in the proportion of un-monitored nest sites available to the penguins when the study was initiated. ImplicationsNotwithstanding the present findings, long-term and consistent monitoring of wildlife populations facing increasing pressure from tourism is essential to ensure effects are detected and that management procedures implemented to reduce potential effects.


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