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Ovambo Sparrowhawk attempting to prey on waterbirds
Get PDFI will also describe a further two hunting techniques in which the predator tried forcing water birds into the wate
Variations on the call of the Pel's Fishing Owl Scotopelia peli
Get PDFThis article refers to personal observations made in the Fig Tree Forest in the Mkuze Game Reserv
Interspecific interaction involving the Ovambo Sparrowhawk Accipiter ovampensis in suburban Gauteng
No full textI will document another method involving a stealthy sneak stoop from a low altitude flight hoping to catch potential prey by surprise as well as higher altitude interactions
Low altitude attack: Ovambo Sparrowhawk preying on Southern Masked Weavers in suburban Gauteng
Get PDFThis paper describes a series of successful attacks on several groups of Southern Masked Weavers Ploceus velatus by an adult male Ovambo Sparrowhawk using hunting techniques previously undescribed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Unusual foraging behaviour of African Paradise Flycatcher Terpsiphone viridis plumbeiceps
No full textThe birds sat either on very low rocks or on the ground. The birds proceeded to hawk very small unidentified insects by making short sallies from their perches usually at very low altitude..
Reed banks used regularly as a day time roost by White-backed Night-Herons in the Kruger National Park
Get PDFjust after sunset I watched a single adult emerge from reed banks and start hunting in a pool nearb
Vocalizations of European Honey Buzzards (Pernis apivorus) in Southern Africa
Get PDFContrary to some sources, the European Honey Buzzard is not silent in Africa. This study documents 51 records of the species vocalizing on the continent. Vocalizations were given by birds apparently encountered alone (n=30) and when accompanied by another European Honey Buzzard (n=22). Where age was known, 11 calling birds were adults and ten were juveniles. Where details were available, most calls were given by birds in flight (n=30), with 11 from perched birds and two from birds heard calling while both in flight and perched. In most cases the sex of the bird was not recorded (n=42) and young birds (first- and second-years) are difficult to sex with certainty; of the remainder, two were males and nine were females. Most calls were the typical flight call of the species (n=43), with apparent alarm calls (n=7) the next most frequent call type. Most calls were delivered in flight (n=31), 19 by single birds and 12 by two birds together in flight. The calling by two birds was associated with flight displays similar to those described on the breeding grounds and occurred especially in late summer (December onwards; 25/40 records). A relatively high proportion of calls occurred during interactions between two European Honey Buzzards (n=18).
Calling associated with two birds together and accompanied by aerial displays has not been described in Africa before, and is suggestive of either early pairing of the adult birds prior to migration or breeding activity locally in Africa. Vocalizations between young birds though may be more social as opposed to sexual in nature. The large (5X) increase in records of European Honey Buzzards in South Africa in recent years likely increases the chances of conspecific interaction. It also raises the possibility of breeding, especially in more-temperate South Africa.
 
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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