Timing of dietary switching by savannah elephants in relation to crop consumption

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Standard

Timing of dietary switching by savannah elephants in relation to crop consumption. / Vogel, Susanne Marieke; Blumenthal, Scott A.; de Boer, Willem Frederik; Masake, Moses; Newton, Ian; Songhurst, Anna Catherine; McCulloch, Graham; Stronza, Amanda; Henley, Michelle Deborah; Coulson, Tim.

I: Biological Conservation, Bind 249, 108703, 09.2020.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Vogel, SM, Blumenthal, SA, de Boer, WF, Masake, M, Newton, I, Songhurst, AC, McCulloch, G, Stronza, A, Henley, MD & Coulson, T 2020, 'Timing of dietary switching by savannah elephants in relation to crop consumption', Biological Conservation, bind 249, 108703. https://doi.org/10.1016/j.biocon.2020.108703

APA

Vogel, S. M., Blumenthal, S. A., de Boer, W. F., Masake, M., Newton, I., Songhurst, A. C., McCulloch, G., Stronza, A., Henley, M. D., & Coulson, T. (2020). Timing of dietary switching by savannah elephants in relation to crop consumption. Biological Conservation, 249, [108703]. https://doi.org/10.1016/j.biocon.2020.108703

CBE

Vogel SM, Blumenthal SA, de Boer WF, Masake M, Newton I, Songhurst AC, McCulloch G, Stronza A, Henley MD, Coulson T. 2020. Timing of dietary switching by savannah elephants in relation to crop consumption. Biological Conservation. 249:Article 108703. https://doi.org/10.1016/j.biocon.2020.108703

MLA

Vancouver

Vogel SM, Blumenthal SA, de Boer WF, Masake M, Newton I, Songhurst AC o.a. Timing of dietary switching by savannah elephants in relation to crop consumption. Biological Conservation. 2020 sep;249. 108703. https://doi.org/10.1016/j.biocon.2020.108703

Author

Vogel, Susanne Marieke ; Blumenthal, Scott A. ; de Boer, Willem Frederik ; Masake, Moses ; Newton, Ian ; Songhurst, Anna Catherine ; McCulloch, Graham ; Stronza, Amanda ; Henley, Michelle Deborah ; Coulson, Tim. / Timing of dietary switching by savannah elephants in relation to crop consumption. I: Biological Conservation. 2020 ; Bind 249.

Bibtex

@article{c201daa87962442abe020d4d7e3df418,
title = "Timing of dietary switching by savannah elephants in relation to crop consumption",
abstract = "Tree and grass quality on the African savannah shows seasonal variation, driving mixed-feeding herbivores to switch between browsing and grazing. During this switch, crop consumption could be an attractive alternative to browsing. We analysed elephant diet variability in the Okavango Delta, Botswana, using faecal stable isotope ratios of carbon (δ^13C) and frequencies of elephant crop consumption, to determine the extent to which crop consumption relates to this potential switch. Although elephants did increase their relative grass consumption in the wet season, browse dominated the annual diet. After February, the proportion of grass in the diet dropped considerably, and continued decreasing through April when farmers reported most crop consumption. Generalized Linear Models revealed that the occurrence of elephant crop consumption increased with the proportion of grass consumed and with decreasing grass quality. The proportion of grass in elephant faeces increased with increasing crop consumption intensity. As crop consumption could also be related to nutrient deficiencies in elephant diet, we calculated the total dietary input of nutrients to reveal potential deficiencies. Elephant diet contained insufficient levels of sodium year-round, and insufficient phosphorus from February to July. As the latter coincides with the timing of crop consumption, we consider our results an indication that phosphorus –and potentially sodium - deficiencies, could play a role in elephant dietary choices, including crop consuming behaviour. Further experimental research is required to show whether supplying elephants with supplementary phosphorus and sodium sources could reduce this micro-nutrient deficiency, and could play a role in reducing elephant crop consumption.",
keywords = "Crop raiding, Elephant crop consumption, Human elephant conflict, Human-wildlife co-existence, Human-wildlife conflict, Mixed-feeders, Stable isotope analysis",
author = "Vogel, {Susanne Marieke} and Blumenthal, {Scott A.} and {de Boer}, {Willem Frederik} and Moses Masake and Ian Newton and Songhurst, {Anna Catherine} and Graham McCulloch and Amanda Stronza and Henley, {Michelle Deborah} and Tim Coulson",
year = "2020",
month = sep,
doi = "10.1016/j.biocon.2020.108703",
language = "English",
volume = "249",
journal = "Biological Conservation",
issn = "0006-3207",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Timing of dietary switching by savannah elephants in relation to crop consumption

AU - Vogel, Susanne Marieke

AU - Blumenthal, Scott A.

AU - de Boer, Willem Frederik

AU - Masake, Moses

AU - Newton, Ian

AU - Songhurst, Anna Catherine

AU - McCulloch, Graham

AU - Stronza, Amanda

AU - Henley, Michelle Deborah

AU - Coulson, Tim

PY - 2020/9

Y1 - 2020/9

N2 - Tree and grass quality on the African savannah shows seasonal variation, driving mixed-feeding herbivores to switch between browsing and grazing. During this switch, crop consumption could be an attractive alternative to browsing. We analysed elephant diet variability in the Okavango Delta, Botswana, using faecal stable isotope ratios of carbon (δ^13C) and frequencies of elephant crop consumption, to determine the extent to which crop consumption relates to this potential switch. Although elephants did increase their relative grass consumption in the wet season, browse dominated the annual diet. After February, the proportion of grass in the diet dropped considerably, and continued decreasing through April when farmers reported most crop consumption. Generalized Linear Models revealed that the occurrence of elephant crop consumption increased with the proportion of grass consumed and with decreasing grass quality. The proportion of grass in elephant faeces increased with increasing crop consumption intensity. As crop consumption could also be related to nutrient deficiencies in elephant diet, we calculated the total dietary input of nutrients to reveal potential deficiencies. Elephant diet contained insufficient levels of sodium year-round, and insufficient phosphorus from February to July. As the latter coincides with the timing of crop consumption, we consider our results an indication that phosphorus –and potentially sodium - deficiencies, could play a role in elephant dietary choices, including crop consuming behaviour. Further experimental research is required to show whether supplying elephants with supplementary phosphorus and sodium sources could reduce this micro-nutrient deficiency, and could play a role in reducing elephant crop consumption.

AB - Tree and grass quality on the African savannah shows seasonal variation, driving mixed-feeding herbivores to switch between browsing and grazing. During this switch, crop consumption could be an attractive alternative to browsing. We analysed elephant diet variability in the Okavango Delta, Botswana, using faecal stable isotope ratios of carbon (δ^13C) and frequencies of elephant crop consumption, to determine the extent to which crop consumption relates to this potential switch. Although elephants did increase their relative grass consumption in the wet season, browse dominated the annual diet. After February, the proportion of grass in the diet dropped considerably, and continued decreasing through April when farmers reported most crop consumption. Generalized Linear Models revealed that the occurrence of elephant crop consumption increased with the proportion of grass consumed and with decreasing grass quality. The proportion of grass in elephant faeces increased with increasing crop consumption intensity. As crop consumption could also be related to nutrient deficiencies in elephant diet, we calculated the total dietary input of nutrients to reveal potential deficiencies. Elephant diet contained insufficient levels of sodium year-round, and insufficient phosphorus from February to July. As the latter coincides with the timing of crop consumption, we consider our results an indication that phosphorus –and potentially sodium - deficiencies, could play a role in elephant dietary choices, including crop consuming behaviour. Further experimental research is required to show whether supplying elephants with supplementary phosphorus and sodium sources could reduce this micro-nutrient deficiency, and could play a role in reducing elephant crop consumption.

KW - Crop raiding

KW - Elephant crop consumption

KW - Human elephant conflict

KW - Human-wildlife co-existence

KW - Human-wildlife conflict

KW - Mixed-feeders

KW - Stable isotope analysis

UR - http://www.scopus.com/inward/record.url?scp=85088835521&partnerID=8YFLogxK

U2 - 10.1016/j.biocon.2020.108703

DO - 10.1016/j.biocon.2020.108703

M3 - Journal article

AN - SCOPUS:85088835521

VL - 249

JO - Biological Conservation

JF - Biological Conservation

SN - 0006-3207

M1 - 108703

ER -