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Sustainability 2009, 1(2), 104-119; doi:10.3390/su1020104
Article

Biotic Translocation of Phosphorus: The Role of Deer in Protected Areas

1, 2, 3
Received: 23 February 2009; Accepted: 7 April 2009 / Published: 14 April 2009
(This article belongs to the Special Issue Net Gains from Depleting Fossil Energy and Mineral Sources)
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Abstract: Biogeochemical cycles are cornerstones of biological evolution. Mature terrestrial ecosystems efficiently trap nutrients and certain ones are largely recycled internally. Preserving natural fluxes of nutrients is an important mission of protected areas, but artificially leaky systems remain common. Native red deer (Cervus elaphus) in the Swiss National Park (SNP) are known to reduce phosphorus (P) in preferred feeding sites by removing more P than is returned with feces. At larger scales it becomes apparent that losses are occurring due to seasonal deer movements out of the SNP where most deer end up perishing. Thus, the SNP contributes to producing deer which translocate P to sink areas outside the SNP due to several artificial factors. An adult female dying outside of SNP exports about 1.8 kg of P, whereas a male dying outside of SNP at 8 years of age exports 7.2 kg of P due also to annual shedding of antlers. Averaged over the vegetated part of the SNP, the about 2,000 deer export 0.32 kg/ha/yr of P. Other ungulate species using the SNP and dying principally outside of its borders would result in additional exports of P. Leakiness in this case is induced by: a) absence of the predator community and thus a lack of summer mortalities and absence of several relevant non-lethal predator effects, b) hunting-accelerated population turnover rate, and c) deaths outside of SNP principally from hunting. The estimated export rate for P compares to rates measured in extensive production systems which receive 10-50 kg/ha/yr of P as fertilizer to compensate the losses from biomass exports. Assumptions were made regarding red deer body weight or population turnover rate, yet substituting my estimates with actual values from the SNP would only affect somewhat the magnitude of the effect, but not its direction. The rate of P loss is a proxy for losses of other elements, the most critical ones being those not essential to autotrophs, but essential to heterotrophs. High deer turnover rates combined with accelerated biomass export warrants detailed mass balances of macro and micro nutrients, and studies of biogeochemical cycles in protected areas are essential if preserving natural processes is a mandate.
Keywords: Cervus elaphus; Phosphorus; Biogeochemical cycle; Protected areas; Biomass export Cervus elaphus; Phosphorus; Biogeochemical cycle; Protected areas; Biomass export
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Flueck, W.T. Biotic Translocation of Phosphorus: The Role of Deer in Protected Areas. Sustainability 2009, 1, 104-119.

AMA Style

Flueck WT. Biotic Translocation of Phosphorus: The Role of Deer in Protected Areas. Sustainability. 2009; 1(2):104-119.

Chicago/Turabian Style

Flueck, Werner T. 2009. "Biotic Translocation of Phosphorus: The Role of Deer in Protected Areas." Sustainability 1, no. 2: 104-119.


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