Banner
   

 

Students

Current Student info

Conservation Society

PhD students

Alumni

Academic staff

Support staff

The Durrell Trust for     Conservation Biology

 

 

Previous PhD students: Nicola Jenner

 

PhD research entitled "Flexibility of black backed jackal, Canis mesomelas, social and spatial organisation with implications for disease transmission"

Jackal by camp (© Nicola Jenner/The Jackal Project)Jackals are a model species for studies in evolutionary biology and behavioural ecology. They are one of few monogamous mammals that breed cooperatively and form an intermediate between the solitary bat-eared fox and the cooperative pack organisation of the African wild dog. Currently little is known of the social organisation of black-backed jackals, Canis mesomelas, outside of Serengeti National Park in East Africa. Behavioural data indicates that the basic social unit is the family group, composed of a monogamous resident pair with a litter and possibly subordinate adults which have delayed reproduction to help rear their siblings (Moehlman 1983). However jackal social organisation is likely to be highly flexible. Firstly, mammalian social behaviour is specifically adapted to the ecological conditions in which the species lives. Secondly, recent genetic studies have shown that carnivore social organisation may be more variable than behavioural observations indicate.

My research forms part of The Institute of Zoology (Zoological Society of London) (IOZ) Jackal Project in Namibia, started in 2000 by Dr. Stephan M Funk, Research Fellow at IOZ. I am based at IOZ and DICE, and am working in collaboration with the Desert Research Foundation Namibia (DRFN), the Durrell Wildlife Conservation Trust (DWCT) Jersey and the University of Vienna. This project will investigate the consequences of ecological flexibility of the black backed jackal for social organisation (reproductive success, helper system, group size, density) and spatial organisation (territoriality, dispersal).

Jackal in seal colony (© Nicola Jenner/The Jackal Project)The study focuses on a population of jackals at Cape Cross Seal Reserve on the Skeleton Coast of Namibia. Cape Cross hosts a simple carnivore guild comprising black backed jackals and brown hyenas which feed almost exclusively on Cape fur seals.

The jackals live at high density (160-200 jackals, Gowtage et al. in prep.) and are easy to observe and are therefore an ideal study population.


The study aims to investigate:

  • Social and spatial organisation of jackals from a behavioural perspective. I will test Moehlman’s (1983) model of jackal social organisation in an ecosystem very different to the Serengeti.
  • Helper system and reproductive success. I will test whether or not helpers do increase pup survival, by monitoring age, gender, rank for helpers versus non-helpers, and incorporating into this the spatial distribution of dens.
  • Investigate group structure and kinship using genetic analysis. I will test hypotheses that (1) extra-pair & reproduction by subordinates does not occur, and (2) helpers are offspring from the previous year, and thus are full siblings of the litter they help to raise.
  • Rank and disease. I will test hypotheses that low ranking jackals have higher disease prevalence, live further from colony and therefore hold larger home ranges.

Understanding these ecological parameters has important implications for disease transmission and conservation. Jackals are abundant, and have widespread distribution, which brings them into contact with sympatric endangered carnivores (e.g. lions, wild dogs), as well as into villages where they can act as critical disease vectors (Canine Distemper Virus, rabies), which may pose a zoonotic risk for humans.

This multidisciplinary study draws on techniques from various fields:

  1. Ecology / behavioural ecology: Direct observations and baiting experiments using video recording to allow detailed analysis. Radio-telemetry and data collected from GPS collars will be analysed using Geographic Information Systems (GIS). Contact rates between healthy and diseased jackals will be recorded to contribute to our understanding of disease transmission.
  2. Molecular biology. Genetic analysis will be used to investigate relatedness within and between groups and individuals.
  3. Endocrinology. In collaboration with University of Vienna faecal samples will be analysed for reproductive/stress hormones.
    The combination of endocrine and molecular analyses will elucidate the physiological determinants of behaviour.

Results of this work will be shared with the Namibian community to form the basis for implementing effective disease management strategies.

Funding
States of Jersey Scholarship
Institute of Zoology