Voedingsassosiasie tussen vee-reiers ( Bubulcus ibis ) en soogdiergashere in die sentrale Vrystaa
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie/South African Journal of Science and Technology
| Field | Value | |
| Title | Voedingsassosiasie tussen vee-reiers ( Bubulcus ibis ) en soogdiergashere in die sentrale Vrystaa Feeding association between cattle egrets (Bubulcus ibis) and mammal hosts in the central Free State | |
| Creator | Butler, H.J.B. Kok, O.B. | |
| Description | Veldwaarnemings wat gedurende Oktober 1995 tot April 2001 in boerderygebiede en wildreservate in die sentrale Vrystaat onderneem is, toon aan dat vee-reiers hoofsaaklik in kommensalistiese assosiasie met hoefdiere of selfs plaasimplemente voed. ’n Groter persentasie plaasdiere as wild was hierby betrokke. Gebaseer op berekende voorkeurindekse kwalifiseer slegs drie spesies, tewete beeste, buffels en witrenosters as sleutelgashere. Elande, gemsbokke, rooibokke en perde is as hoofgashere geklassifiseer, terwyl die res van die dertien waargenome gasheerspesies as ondergeskikte gashere geïdentifiseer is. Meer as die helfte van alle voedingsassosiasies (58,4%) het gedurende die vroegoggend voorgekom, gevolg deur ’n afname gedurende die middel van die dag met ’n effense toename weer later in die middag. Afhangende van die gasheerspesie betrokke kom duidelike verskille in die tydstip van assosiasies voor. Beeste was die enigste gasheer waarmee vee-reiers deurlopend op enige tydstip van die dag geassosieer het. Klaarblyklik assosieer vee-reiers verreweg die meeste met grotere gasheersoorte wat aktief wei. In grasveldhabitats voed die voëls hoofsaaklik vóór gashere wat wei, maar ágter dié wat vinnig beweeg. Field observations undertaken during October 1995 to April 2001 in agricultural areas and nature reserves of the central Free State, indicate that cattle egrets mainly feed in commensalistic association with ungulates or even farm implements. A higher percentage farm animals than game was involved herewith. Based on calculated preference indices only three species, namely cattle, buffalo and white rhino, qualified as key hosts. Eland, gemsbok, impala and horses were classified as major hosts, while the rest of the thirteen observed host species were identified as minor hosts. More than half of all feeding associations (58,4%) occurred during the early mornings followed by a decrease during the middle of the day with a slight increase again later in the afternoon. Depending on the host species involved, notable differences occurred in the time of association. Cattle were the only host species with which cattle egrets associated during any time of the day. Evidently, cattle egrets associated most often with larger host species which were actively grazing. In grassland habitats the birds mainly fed in front of grazing hosts, but behind those that moved too fast. | |
| Publisher | AOSIS | |
| Date | 2006-09-22 | |
| Identifier | 10.4102/satnt.v25i1.139 | |
| Source | Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie; Vol 25, No 1 (2006); 1-18 Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie; Vol 25, No 1 (2006); 1-18 2222-4173 0254-3486 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://journals.satnt.aosis.co.za/index.php/satnt/article/view/139/117
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