Previous PhD students: Nicola Jenner
PhD research entitled "Flexibility of black backed jackal, Canis
mesomelas, social and spatial organisation with implications for disease
transmission"
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).
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 Moehlmans (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:
- 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.
- Molecular biology. Genetic analysis will be used to investigate
relatedness within and between groups and individuals.
- 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
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