Least Bittern (Ixobrychus exilis) Science Article 3 abstract Habitat selection and reproductive effort of least bitterns (Ixobrychus exilis) weremonitored in 2001 and 2002 at Mingo National Wildlife Refuge (Mingo) in southeastMissouri and 2001 through 2004 at Agassiz National Wildlife Refuge (Agassiz) innorthwest Minnesota. The main objective was to study variation in the breeding ecologyof least […]
Category: Ciconiiformes
Least Bittern nesting colonially
Least Bittern (Ixobrychus exilis) Science Article 6 abstract Unlike most herons, bitterns are considered to be noncolonial nesters. Literature records of the nesting dispersion of the Least Bittern (lxobrychus exilis) support this view. Beecher (1942) reported densities ranging from 1 nest in 39.87 acres (0.06 nests per ha) to 4 nests in 1.38 acres (1.7 […]
Population Viability AssessmentForLeast Bittern (Ixobrychus Exilis)
Least Bittern (Ixobrychus exilis) Science Article 1 abstract In Illinois, this species is an uncommon migrant and summer resident. Recent recordsinclude the following counties: Carroll, Cass, Coles, Cook, Crawford, DuPage, Fulton,Grundy, Henry, Kane, Kendall, Lake, Lawrence, Lee, Marshall, Mason, Massac,McHenry, Putnam, Rock Island, Sangamon, Tazewell, Vermilion, Will, Williamson,Winnebago. Christopher J. Whelan, Center for Biodiversity. Un. […]
Evidence of prenuptial moult in the Little BitternIxobrychus minutus
Least Bittern (Ixobrychus exilis) Science Article 4 abstract Evidence for a partial prenuptial moult in the Little Bittern Ixobrychus minutus is reported for the firsttime, and is based on both live and museum specimens. The prenuptial moult, which is probablyundertaken in the African winter quarters shortly before the spring migration, involves body feathersand often some […]
Extra-pair copulations of Grey Herons nesting at high densities
Grey Heron (Ardea cinerea) Science Article 2 abstract The copulatory behaviour of Grey Heron Ardea cinerea was observed in a colony in Donana (SW Spain) during two years. A total of 262 pair copulation attempts (PCAs) and 39 extra-pair copulation attempts (EPCAs) (12.9% of all copulation attempts) were observed among 31 focal pairs. 84% of […]
Factors affecting the breeding success of the grey heron ( Ardea cinerea)in northern Poland
Grey Heron (Ardea cinerea) Science Article 1 abstract The aim of this study was to estimate the importance of factors a.ecting the breeding success of the grey heron (Ardea cinerea) in three colonies in the northern Poland (Mosty and Ryback), differentiated in population size, habitat type and feeding areas used by birds. The highest mean […]
FORAGING ECOLOGY OF SEVEN SPECIES OF NEOTROPICAL IBISES (THRESKIORNITHIDae) DURING THE DRY SEASON IN THE LLANOS OF VENEZUELA
Green Ibis (Mesembrinibis cayennensis) Science Article 1 abstract sympatric species of ibises (Threskiomithidae) in the Venezuelan llanos during the dry season of 1989. Scarlet (Eudocimus ruber), Glossy (Plegadis falcinellus), and Bare-faced (Phimosus infiscatus) ibises were the most common species. White (E. albus), Green (Mesembrinibis cayennensis), Sharp-tailed (Cercibis oxycerca), and Buff-necked( Theristicus caudatus) ibises together made […]
The Song of the Green Heron (Butoroides virescens virescens)
Green Heron (Butorides virescens) Science Article 3 abstract The ‘pumping’ of the Bittern and the ‘cooing’ of the Least Bittern may be classedu nder the head of song,b ut for the Herons as a group there seems to be singularly little recorded in the way of a coUrtShip song CHARLES W. TOWNSEND, The AUK, Vol. […]
Green Heron as a Potential Prey Species of the Broad-winged Hawk.
Green Heron (Butorides virescens) Science Article 2 abstract Avian surveys were conducted 21-23 May 1974 in a series of three kettle holes onthe Montague Plain, iu Franklin County, near Greenfield, Massachusetts. Pitchpine (Pinus rigida) dominated the bases and sides of the kettle holes. Ponds,surrounded by a dense growth of meadow-sweet (Spiraea latifolia) and S. tomentosa),were […]
SOME OBSERVATIONS IN A GREEN HERON COLONY
Green Heron (Butorides virescens) Science Article 1 abstract This report has to do with some observations made in a Green Heron colony during the seasons of 1921 and 1922. The colony was located in a willow marsh near the north shore of the eastern section of the dam at Lakeview, Kansas. BESSIE PRICE REED, The […]