Medium-Term Fluctuations of Birds and Their Potential Food Resources in the Knysna Forest

Koen, J. H.

doi:10.1080/00306525.1992.9634178

Cited by 17 publications

(7 citation statements)

References 16 publications

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“…Poicephalus , Psittacus , Agapornis and Psittacula ) track the availability of food resources as specialist or generalist feeders (Boyes & Perrin 2009a, 2009b; Chapman et al . 1993, Koen 1992, Ndithia & Perrin 2006, Perrin et al . 2002, Selman et al .…”

Section: Introductionmentioning

confidence: 99%

“…Dietary studies of African parrots in the wild indicate that all four continental genera (i.e. Poicephalus, Psittacus, Agapornis and Psittacula) track the availability of food resources as specialist or generalist feeders (Boyes & Perrin 2009a, 2009bChapman et al 1993, Koen 1992, Ndithia & Perrin 2006, Selman et al 2002, Symes & Perrin 2003a, Taylor & Perrin 2006, Warburton & Perrin 2005, Wirminghaus et al 2002. Seed predators, such as parrots, are predicted to track food resource availability to exploit temporal and spatial fluctuations in fruit and flower production (Galetti 1993, Gautier-Hion & Michaloud 1989, Renton 2001, Robinet et al 2003.…”

Section: Introductionmentioning

confidence: 99%

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Aerial surveillance by a generalist seed predator: food resource tracking by Meyer's parrotPoicephalus meyeriin the Okavango Delta, Botswana

Boyes

Perrin

2010

J. Trop. Ecol.

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Abstract:As a proven food resource generalist, Meyer's parrot (Poicephalus meyeri) was expected to track the availability of all significant food resources in its diet over time. Here we recorded all feeding activity during 366 standardized road transects for correlation with an index of relative food resource abundance over 18 mo. As expected, Meyer's parrot made food resource decisions according to relative abundance at landscape level. Feeding activity on food resources available throughout the year (e.g. ripeKigelia africanafruit) or not visible from the air (e.g. unripeDiospyros lycoidesfruit), however, did not correlate significantly with fluctuations in their relative resource abundance. In addition, over 70% of all feeding bouts were in the high canopy and over 70% of all food items consumed formed bi-coloured displays. The influence of estimated protein and energy acquisition rates from different food resources was insignificant. Therefore, important selection criteria for utilization by Meyer's parrot include relative abundance and visibility from the air (i.e. food resources with the highest probability of encounter when dispersing from a central roost). Sensitivity to fluctuations in resource abundance at landscape level demonstrates the relative importance of maximizing net gain per unit foraging time by minimizing foraging flight distance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerial surveillance by a generalist seed predator: food resource tracking by Meyer's parrotPoicephalus meyeriin the Okavango Delta, Botswana

Boyes

Perrin

2010

J. Trop. Ecol.

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“…Migration can be defined as the seasonal movement of a species from one place to another. Seasonal migration of a species is considered as an adaptive phenomenon evolved through ages to derive maximum advantage from ambient environmental conditions (Koen, 1992). Birds migrate to an area where food is more abundant, less competition for nesting space, the climate is milder and/or the daylight hours are longer to enhance the chances of survival of a bird and its brood.…”

Section: Resultsmentioning

confidence: 99%

First Record of Anas querquedula (Linnaeus, 1758) from Chandertal and Marshy Meadows of Spiti River Near Lossar, in Himachal Pradesh, India

Thakur¹,

Mehta²

2015

Asian J. of Scientific Research

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Anas querquedula (Linnaeus, 1758) commonly known as garganey, has been reported for the first time from the Chandertal wetland, an internationally known Ramsar Site and from the wet meadows in the vicinity of Spiti river in Lossar village of Spiti Valley, Himachal Pradesh, India. Garganey has been reported in Himachal Pradesh from Pong Dam wetland (also a Ramsar Site) in Kangra District at an altitude of 390-423 meter above mean sea level. There it has been reported as a late visitor who arrives in the months of August and September every year. It is a new record of this bird from Chandertal wetland and from the Lossar area of Spiti river located on the Eastern side of famous Kunzum Pass.

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“…Most census work has focussed on forests in the Eastern Cape (Skead 1964;Cody 1983;Koen 1988aKoen , 1988bKoen , 1992Armstrong and van Hensbergen 1994;Castley 1997), while very little work has been done in KwaZulu-Natal (Cooper 1985;Oatley 1989;Kruger and Lawes 1997;Symes et al 2000bSymes et al , 2002 and less in the Mpumalanga (von Maltitz 2003), and Limpopo provinces (Symes et al 2000a). Most studies have spanned less than three years, with very few attempts having being made to examine long-term trends in avifaunal species composition within forests, to ensure that all species were recorded.…”

Section: Introductionmentioning

confidence: 97%

Annual and seasonal trends in avifaunal species richness in a coastal lowlands forest reserve in South Africa

Brown

2006

Ostrich

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Annual and seasonal trends in species richness of the avifaunal community of a coastal forest at Umdoni Park, Pennington, KwaZulu-Natal, South Africa were assessed. Presence/absence data were collected between September 1996 and February 2003, using transect lines and mist-netting. A total of 188 avian species was found utilising the forest or forest edge, of which 33 species (17.6%) were forest-specific. More species were recorded in summer than in winter, because of the presence of summer migrants. The number of forest-specific species was, however, higher in winter than in summer, caused by several altitudinal migrants and one coastal migrant being present in winter only. Of the 188 species recorded, 105 were resident, 44 were recorded in summer only, 32 in winter only, and the remaining 44 recorded only occasionally. The study highlights the need for continuous and long-term studies to be conducted in southern African forests, in order to better understand the dynamics of their avifaunal communities.

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Medium-Term Fluctuations of Birds and Their Potential Food Resources in the Knysna Forest

Cited by 17 publications

References 16 publications

Aerial surveillance by a generalist seed predator: food resource tracking by Meyer's parrotPoicephalus meyeriin the Okavango Delta, Botswana

Aerial surveillance by a generalist seed predator: food resource tracking by Meyer's parrotPoicephalus meyeriin the Okavango Delta, Botswana

First Record of Anas querquedula (Linnaeus, 1758) from Chandertal and Marshy Meadows of Spiti River Near Lossar, in Himachal Pradesh, India

Annual and seasonal trends in avifaunal species richness in a coastal lowlands forest reserve in South Africa

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