Nestling Diet and Breeding Success of Little Bitterns Ixobrychus minutus at Two Artificial Fishpond Complexes in South-Western Slovakia

Ardea ◽  
2020 ◽  
Vol 108 (2) ◽  
Author(s):  
Alfréd Trnka
Keyword(s):  
Breeding Success ◽  
Nestling Diet ◽  
Ixobrychus Minutus

scholarly journals Does Habitat Diversity Modify the Dietary and Reproductive Response to Prey Fluctuations in a Generalist Raptor Predator, the Eurasian Buzzard Buteo buteo?

Birds ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 114-126
Author(s):  
Marek Panek
Keyword(s):  
Habitat Quality ◽  
Breeding Success ◽  
Common Vole ◽  
Habitat Diversity ◽  
Crop Fields ◽  
Buteo Buteo ◽  
Nestling Diet ◽  
Reproductive Response ◽  
Agricultural Habitat ◽  
Small Fields

Predators can modify their diet and demography in response to changes in food availability and habitat quality. I tested the prediction that some species can change their predation pattern, between specialist type and generalist type, depending on the complexity of habitat structure. It was hypothesized that their dietary response is stronger in diversified habitats than in simplified ones, but the opposite tendency occurs in the case of reproductive response. The nestling diet and breeding success of the Eurasian Buzzard Buteo buteo, the abundance of its main prey (the common vole Microtus arvalis), and that of the most important alternative prey group (passerines) were estimated over ten years in two types of agricultural habitat in western Poland, i.e., in the diversified habitat of small fields and the simplified habitat of large fields. The vole abundance was higher in large fields, but the abundance of passerines was greater in small fields. The frequency of voles in the Eurasian Buzzard nestling diet was higher in large fields than in small fields and increased with the abundance of this prey in crop fields. However, no difference in the relationship between the vole frequency in the diet of Eurasian Buzzards and the abundance of voles was found between the two habitat types. The breeding success of Eurasian Buzzards was dependent on the vole abundance, but this relationship did not differ between the two field types. It seems that the pattern of dietary and reproductive response of Eurasian Buzzards depends on the actual availability of individual prey species, which can be modified by habitat quality, rather than on relative prey abundance.

Climate change and breeding success: decline of the capercaillie in Scotland

2001 ◽  
Vol 70 (1) ◽  
pp. 47-61 ◽  
Author(s):  
Robert Moss ◽  
James Oswald ◽  
David Baines
Keyword(s):  
Climate Change ◽  
Breeding Success

The Breeding Success of Lesser Kestrels Falco naumanni in Mongolia

2020 ◽  
Vol 19 (1) ◽  
pp. 73
Author(s):  
Onolragchaa Ganbold ◽  
John Azua ◽  
Woon Kee Paek ◽  
Munkhbaatar Munkhbayar ◽  
Ariunbold Jargalsaikhan ◽  
...  
Keyword(s):  
Breeding Success ◽  
Falco Naumanni

Home range and landscape use by a marabou stork and the breeding success of Africa's most southerly breeding colony

2021 ◽  
Author(s):  
David A. Ehlers Smith ◽  
Brent Coverdale ◽  
Ben Hoffman ◽  
Christopher Kelly ◽  
Yvette C. Ehlers Smith ◽  
...  
Keyword(s):  
Home Range ◽  
Breeding Success ◽  
Breeding Colony ◽  
Landscape Use ◽  
Marabou Stork

Breeding success and its correlates in native versus invasive secondary cavity-nesting birds

2021 ◽  
pp. 1-6
Author(s):  
Françoise Lermite ◽  
Salit Kark ◽  
Chloe Peneaux ◽  
Andrea S. Griffin
Keyword(s):  
Breeding Success ◽  
Cavity Nesting

scholarly journals Common Loon, Gavia immer, Breeding Success in Relation to Lake pH and Lake Size Over 25 Years

2009 ◽  
Vol 123 (2) ◽  
pp. 146 ◽  
Author(s):  
Robert Alvo
Keyword(s):  
Breeding Success ◽  
Low Ph ◽  
Single Pair ◽  
Gavia Immer ◽  
Common Loon ◽  
Sulphur Deposition ◽  
Acidic Lakes ◽  
Ph Range ◽  
Lake Size ◽  
Critical Ph

I monitored Common Loon (Gavia immer) breeding success in relation to lake pH (range 4.0–8.5) between 1982 and 2007 on 38 single-pair lakes (5–88 ha) in the Sudbury, Ontario, area. No chicks fledged on lakes with pH < 4.4. Chicks fledged on lakes with slightly higher pH only if the lakes were relatively large. Acidic lakes became less acidic as sulphur dioxide emissions from the Sudbury smelters and sulphur deposition from other long-range sources decreased. Two lakes initially too acidic to support successful loon reproduction eventually had successful reproduction. One loon pair used two large acidic lakes (combined area 140 ha) connected by shallow rapids, and one of the adults made extremely long dives (average = 99 s) while foraging for the chicks. One chick died on that lake after apparently ingesting a very large food item; the lack of smaller items was attributed to the lake’s acidity. My results suggest that a shortage of food for chicks is the main reason why low pH reduces breeding success. I suggest that, for lakes without high levels of dissolved organic carbon (DOC), the critical pH for loon breeding success is approximately 4.3, and the suboptimal pH is approximately 4.4–6.0.

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