Ciska Scheijen

Ms. Ciska Scheijen

orcid

Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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25 April 2021 in Animals
Verified
Journal Article
Open access
PDF file
CSCiska Scheijen
Ciska Scheijen
SMSean van der Merwe
Sean van der Merwe
Andre GanswindtAndre Ganswindt
Andre Ganswindt
Francois DeaconFrancois Deacon
Francois Deacon
Giraffes are an important tourist attraction, and human presence to wildlife is increasing. This has an impact on an animal’s behavior and its endocrine correlates. Studies on other species show alterations in movement patterns, vigilance, and stress-related hormone levels in the presence of humans. Limited information is available on how anthropogenic activities alter giraffe’s behavior, social structure, and related endocrine parameters. The purpose of this study was to obtain insight into anthropogenic influences on giraffe’s behavior and adrenal activity. We used GPS devices mounted onto giraffes to compare the distance walked in the presence or absence of human observers. We also conducted behavioral observations to assess their vigilance and collected fecal samples to analyze their fecal glucocorticoid metabolite (fGCM) concentrations. Giraffes walked significantly further distances in the presence of humans, but the cumulative time that observers were present decreased the hourly distance walked with an observer present, suggesting that the giraffes were becoming habituated. The number of observers present significantly increased the percentage of time spent on observing an observer as well as the number of unhabituated individuals present in the herd. The percentage of time spent observing a human observer did not decrease with the increase of habituation. Last, fGCM concentrations increased with human presence but decreased when individuals became habituated to human presence. More research is needed to understand the effect of anthropogenic influences in different scenarios (e.g., tourism, vehicles, hunting, etc.).

2 March 2020 in African Journal of Ecology
Verified
Journal Article
Open access
PDF file
ZRZoe Raw
Zoe Raw
DLDerek Lee
Derek Lee
CSCiska Scheijen
Ciska Scheijen
MSMegan K. L. Strauss
Megan K. L. Strauss
KCKerryn D. Carter
Kerryn D. Carter
FDFrancois Deacon
Francois Deacon
Giraffe populations have declined dramatically in the last three decades. Giraffe translocations are likely to increase as wildlife managers seek to augment or re‐establish populations. Currently, formal practical guidance for giraffe translocations is limited. Here, we present a review of translocation guidelines emphasising planning, implementation, monitoring and evaluation, and we review giraffe behaviour and ecology to provide recommendations specific to the translocation of giraffes. We also aim to stimulate discussion about best practices for giraffe translocations and further research into the ethical and practical considerations of moving giraffes.

1 March 2021 in African Journal of Ecology
Verified
Journal Article
Closed access
PDF file
CSCiska Scheijen
Ciska Scheijen
FBFred B. Bercovitch
Fred B. Bercovitch
ILIlse Luther‐Binoir
Ilse Luther‐Binoir
Andre GanswindtAndre Ganswindt
Andre Ganswindt
Francois DeaconFrancois Deacon
Francois Deacon

8 September 2020 in African Journal of Ecology
Verified
Journal Article
Closed access
PDF file
CSCiska Scheijen
Ciska Scheijen

16 March 2021
Verified
Preprint
Open access
SMSean van der Merwe
Sean van der Merwe
CSCiska Scheijen
Ciska Scheijen
Francois DeaconFrancois Deacon
Francois Deacon
Andre GanswindtAndre Ganswindt
Andre Ganswindt
Human presence to wildlife is increasing, this has an impact on an animal’s behavior and endocrinology. This work presents a first insight in the effect of human observers on the behavior and stress hormones of free-roaming giraffes as well as their habituation process. Our data shows that human presence may have an influence on the social structure and reproductive fitness of the species. More research is needed to compare different sites and anthropogenic influences.

16 March 2021
Verified
Preprint
Open access
SMSean van der Merwe
Sean van der Merwe
CSCiska Scheijen
Ciska Scheijen
Francois DeaconFrancois Deacon
Francois Deacon
Andre GanswindtAndre Ganswindt
Andre Ganswindt
Human presence to wildlife is increasing, this has an impact on an animal’s behavior and endocrinology. This work presents a first insight in the effect of human observers on the behavior and stress hormones of free-roaming giraffes as well as their habituation process. Our data shows that human presence may have an influence on the social structure and reproductive fitness of the species. More research is needed to compare different sites and anthropogenic influences.