Principal foods versus preferred foods and their relations to stocking rate and range condition

Dry Season Browse Preference for the Black Rhinoceros (Diceros bicornis): The Case of the Midlands Black Rhino Conservancy (MBRC), Zimbabwe

“…Proportional availability (Pa) was calculated from every fifth quadrat along the feeding path and it was calculated by dividing the number of times that a species occurred in all the availability plots by the total number of occurrences for all species in that habitat type. Food Preference Indices (FPIs) of all browsed species were calculated by using the following formula: FPI =Pu/Pa, where Pu-proportional usage and Pa-proportional availability (FPI values greater or lesser than 1 indicated species that are preferred or avoided respectively) (Petrides, 1975).…”

An ecological succession model applied to environmental management

“…Human recreational use of rangeland will also increase. On a world wide basis, range will become more and more important as reserves for game and plant species (Petrides 1971). …”

Hábitos alimenticios de Lagidium viscacia y Abrocoma cinerea: roedores sintópicos en ambientes altoandinos del norte de Chile

“…El estudio de la selección trófica, o preferencia alimenticia, en la cual se consideran los valores nutricionales de los ítemes alimenticios seleccionados por las especies (Petrides 1975), es de utilidad para predecir los hábitats potenciales que serían ocupados por las especies (Drickamer 1971), y la segregación espacial a escala geográ-fica entre especies simpátridas (Drickamer 1970) y, en casos de estudios más complejos, permite determinar el impacto de las poblaciones de herbívoros sobre la cubierta vegetacional (Petrides 1975).…”