Breeding biology and breeding success of the Lesser Grey Shrike Lanius minor in a stable and dense population

Ibis ◽  
2008 ◽  
Vol 142 (2) ◽  
pp. 305-311 ◽  
Author(s):  
ANTON KRISTIN ◽  
HERBERT HOI ◽  
FRANCISCO VALERA ◽  
CHRISTINE HOI
Keyword(s):  
Breeding Success ◽  
Breeding Biology ◽  
Dense Population ◽  
Lesser Grey Shrike ◽  
Grey Shrike

scholarly journals Breeding biology of coppersmith barbet, Megalaima haemacephala (Müller, 1776)

2013 ◽  
Vol 31 ◽  
pp. 31-34
Author(s):  
Noor Jahan Sarker ◽  
M Firoj Jaman ◽  
Shariar Mustafa ◽  
Md Saidur Rahman
Keyword(s):  
Incubation Period ◽  
Breeding Season ◽  
Breeding Success ◽  
Brood Size ◽  
Botanical Garden ◽  
Egg Laying ◽  
Breeding Biology ◽  
Average Weight ◽  
Average Height ◽  
Average Depth

Breeding biology of the Coppersmith barbet, Megalaima haemacephala (Müller, 1776) was carried out between February, 2006 and January, 2007 at Sharawardy Uddyan, Ramna Park, Curzon Hall and National Botanical Garden. The breeding season started from December and ended in June. In total 20 nests were observed, of which 10 nests were studied in details in four study areas. The coppersmith barbet mostly preferred to make holes on the branches of koroi (Albizzia procera) for nesting. Egg laying started on 15th February in the study areas. Average height of nests from the ground was 9.7m and average depth and diameter of the holes was 29.20cm and 4.46cm respectively. New holes were constructed yearly or the old one was reused. Both the sexes took part in incubation of eggs, brooding and feeding to the nestlings. A total of 30 eggs were laid in 10 nests. Clutch size varied from 2 – 4 eggs (average: 3 eggs). Among them, 20 (66.67%) eggs were hatched and the rest 10 (33.33%) were unhatched and lost. Average incubation period was 14 days. The male and the female incubated the eggs for an average of 27.44 minutes/ hours and 32.56 minutes/ hours, respectively. Average number of nestlings (brood size) per nest was 2. Out of 20 nestlings, 16 left their nests successively. The breeding success was 53.33% in relation to the number of eggs laid and 80% in relation to nestlings hatched. The average weight of eggs and nestlings was 3.59g and 9.33g, respectively. The main causes of loss of the eggs and nestlings were human interference, predation and ectoparasitic infections. Insects and fruits were fed to the nestlings by their parents.DOI: http://dx.doi.org/10.3329/ujzru.v31i0.15397Univ. j. zool. Rajshahi Univ. Vol. 31, 2012 pp. 31-34 

Heterospecific social attraction in migrant birds: habitat niche overlap between two threatened shrikes

2019 ◽  
Vol 46 (1) ◽  
pp. 25 ◽  
Author(s):  
Gianpasquale Chiatante
Keyword(s):  
Niche Overlap ◽  
Indicator Kriging ◽  
Habitat Requirements ◽  
Distribution Models ◽  
Social Attraction ◽  
Conservation Implications ◽  
Habitat Niche ◽  
Lesser Grey Shrike ◽  
Migrant Birds ◽  
Grey Shrike

Context Effective biodiversity conservation requires information about a species’ ecology and its relationship with the geographical context. To achieve this efficiently, species distribution models can be developed, also taking into account species associations. Aims I aimed to illustrate the habitat requirements of two threatened passerines of semi-open landscapes, i.e. the lesser grey shrike, Lanius minor, and the woodchat shrike, Lanius senator, in southern Italy. Further, I assessed whether there is heterospecific social attraction between them, by assessing how their habitat niches overlap. Methods Data were collected by territory mapping during the 2009–13 breeding seasons. The habitat requirements of the species were investigated with the help of ecological niche factor analysis (ENFA). In addition, the areas of sympatry between the two species were defined by indicator kriging and the habitat niche overlap was analysed using the generalised linear model (GLM). Key results The results showed that these two species inhabit open areas, with scattered vegetation such as shrubs and trees, while avoiding intensively cultivated permanent crops, such as vineyards and olive groves. Moreover, a little difference was observed in the percentage cover of shrublands, which were higher in the woodchat shrike territories than in the lesser grey ones. The strong overlap in their habitat niches suggests heterospecific social attraction between them, especially because of the species rarity. Conclusions The lesser grey and the woodchat shrike were found to occur in very similar environments, by evidencing the overlap of their macrohabitat niches. This suggests the presence of heterospecific social attraction, corroborating the understudied hypothesis that this phenomenon is valid for migrant birds as well. The lesser grey shrike, in particular, may use occurrences of the woodchat shrike as a cue for assessing habitat quality and, thus, to establish its territory. Implications Considering the high habitat niche overlap, habitat changes occurring in the landscape might affect them equally. Furthermore, the use of heterospecific social information in habitat selection potentially has many important conservation implications. Indeed, by reproducing the appropriate information, birds could be attracted to specific sites known to be high-quality habitat.

Population decline is accompanied by loss of genetic diversity in the Lesser Grey Shrike Lanius minor

Ibis ◽  
2010 ◽  
Vol 153 (1) ◽  
pp. 98-109 ◽  
Author(s):  
LAURA KVIST ◽  
DAVID GIRALT ◽  
FRANCISCO VALERA ◽  
HERBERT HOI ◽  
ANTON KRISTIN ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Decline ◽  
Lesser Grey Shrike ◽  
Loss Of Genetic Diversity ◽  
Grey Shrike

scholarly journals The breeding biology of the Critically Endangered Seychelles Scops-owl Otus insularis: consequences for conservation and management

2004 ◽  
Vol 14 (2) ◽  
pp. 123-137 ◽  
Author(s):  
DAVE CURRIE ◽  
RODNEY FANCHETTE ◽  
JAMES MILLETT ◽  
CAMILLE HOAREAU ◽  
NIRMAL J. SHAH
Keyword(s):  
Breeding Success ◽  
Sex Roles ◽  
Montane Forest ◽  
Breeding Biology ◽  
Critically Endangered ◽  
Restricted Range ◽  
Conservation Implications ◽  
Tree Cavities ◽  
Conservation And Management

The endemic Seychelles Scops-owl Otus insularis is a Critically Endangered restricted-range species currently recorded only from the montane forest of Mahé, the largest (152 km2) and highest (903 m) island in the granitic Seychelles. Limited research has been conducted on the species and, in particular, details of its breeding biology are poorly known. Behavioural observations were made on 12 pairs by the systematic monthly use of playback of conspecific calls, in conjunction with frequent non-playback territory visits from April 1999 to May 2001. A total of eight nests, including the first nest record, were found on three territories. All were in tree cavities (7–25 m high) and contained either a single egg or chick. This was consistent with additional observations of solitary fledglings (n = 11, from eight territories). Incubation lasted 3–4 weeks and the fledging period was 4–6 weeks (data from two nests). The timing of copulations, in conjunction with the detection of nests and fledglings, suggests that the scops-owl can breed throughout the year with peaks in nesting occurring around May and October. Sex roles during breeding were similar to those of other Strigidae owls: incubation was performed by the female; males courtship-fed the female prior to and during incubation, and the female and chick for the first 2 weeks post-hatching; and both parents fed older chicks and fledglings. Fledglings remained on territory for at least 3 months. Breeding success of study pairs was low: two of eight nests were successful and 11 fledglings (recorded from eight of 12 study territories) were observed in a 26-month period, equivalent to c. 0.5 fledglings per territory per year. Evidence suggests that alien predators may have been a factor limiting breeding success. We discuss the conservation implications of our findings.

Breeding biology of the Grey Shrike-thrush (Colluricincla harmonica)

2005 ◽  
Vol 105 (3) ◽  
pp. 223-231 ◽  
Author(s):  
Helen C. Stevens ◽  
David M. Watson
Keyword(s):  
Breeding Biology ◽  
Grey Shrike

scholarly journals Breeding biology of common kingfisher (Alcedo atthis, Linnaeus 1758)

2021 ◽  
Vol 47 (1) ◽  
pp. 23-34
Author(s):  
Habibon Naher ◽  
Noor Jahan Sarker ◽  
Shawkat Imam Khan
Keyword(s):  
Natural Disaster ◽  
Breeding Season ◽  
Body Length ◽  
Breeding Success ◽  
Hatching Success ◽  
Total Body Length ◽  
Breeding Biology ◽  
The Common ◽  
Total Body

The breeding biology of the common kingfisher (Alcedo atthis) was studied from 2008 to 2011 in Dhaka North City Corporation and Savar Upazilla. The breeding season was April to September. It laid 3 to 7 glossy white, almost round eggs with a size of 2.5±0.3 cm length, 2.2±0.3 cm breadth, and 5.3±0.7g weight. It incubated for 16 to 21 days. During hatching, the hatchlings’ weight ranged from 8.5 to 10.5 g and total body length from 43.2 to 58.6 mm whereas, it was 30.1 to 32.7 g and 151 to 155.5 mm, respectively, during fledging. Hatching success was 83.3%. Stolen by people (13.9%) and infertility (2.8%) were the causes of egg loss. The young birds fledged out after 21 to 27 days of hatching. A total of 56.7% of nestlings were unable to fly due to stolen (43.3%), deaths due to unknown reasons (6.7%) and deaths due to natural disaster (6.7%). The breeding success was 36.1% in relation to eggs laid and 43.3% in relation to eggs hatched. J. Asiat. Soc. Bangladesh, Sci. 47(1): 23-34, June 2021

scholarly journals Drone assessment of habitat selection and breeding success of Gull-billed Tern Gelochelidon nilotica nesting on low-accessibility sites: a case study

2021 ◽  
Vol 90 (2) ◽  
Author(s):  
Francesco Scarton ◽  
Roberto Valle
Keyword(s):  
Habitat Selection ◽  
Breeding Success ◽  
Hatching Success ◽  
Ground Level ◽  
Breeding Biology ◽  
Nest Attendance ◽  
Fish Farms ◽  
Breeding Sites ◽  
Water Edge

The use of drones in the study of waterbird breeding biology has received considerable attention in the last years, but very few studies were made along the Mediterranean. We studied habitat selection and breeding success of the Gull-billed Tern Gelochelidon nilotica in two colonies inside fish farms along the Italian Adriatic coastline, using a small, commercial drone. Both colonies were located on small islets surrounded by very shallow water and clayey bottoms, thus being difficult to access. Compared with availability, the Gull-billed Terns selected quadrats higher above the water level, with a higher vegetation cover, which lay farther from the water edge, contain less water, and which are more frequently located in the center of the islands. 147 of 178 clutches (mean clutch size ± SD: 2.61 ± 0.58) hatched 383 chicks (82.5%; 2.15 ± 1.09 chicks per nest), with large differences between the two colonies. Hatching success was 95.0% and 69.1%; the most common cause of egg loss was flooding (97.0%). Nest attendance could easily be ascertained by 30-m above ground level drone-derived imagery. The use of a drone allowed the study of some aspects of the breeding biology of the Gull Billed Tern in two breeding sites where the traditional field approach, i.e. researchers reaching the sites by boat, would have been very difficult, causing unavoidable and prolonged disturbance to the nesting adults.

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