Explaining geographical variation in the isotope composition of mouse lemurs (Microcebus)

Crowley, Brooke E., Thorén, Sandra, Rasoazanabary, Emilienne, Vogel, Erin R., Barrett, Meredith A., Zohdy, Sarah, Blanco, Marina B., McGoogan, Keriann C., Arrigo-Nelson, Summer J., Irwin, Mitchell T., Wright, Patricia C., Radespiel, Ute, Godfrey, Laurie R., Koch, Paul L. and Dominy, Nathaniel J. (2011) Explaining geographical variation in the isotope composition of mouse lemurs (Microcebus). Journal of Biogeography, 38 11: 2106-2121. doi:10.1111/j.1365-2699.2011.02551.x


Author Crowley, Brooke E.
Thorén, Sandra
Rasoazanabary, Emilienne
Vogel, Erin R.
Barrett, Meredith A.
Zohdy, Sarah
Blanco, Marina B.
McGoogan, Keriann C.
Arrigo-Nelson, Summer J.
Irwin, Mitchell T.
Wright, Patricia C.
Radespiel, Ute
Godfrey, Laurie R.
Koch, Paul L.
Dominy, Nathaniel J.
Title Explaining geographical variation in the isotope composition of mouse lemurs (Microcebus)
Formatted title
Explaining geographical variation in the isotope composition of mouse lemurs (Microcebus)
Journal name Journal of Biogeography   Check publisher's open access policy
ISSN 0305-0270
1365-2699
Publication date 2011-11-01
Sub-type Article (original research)
DOI 10.1111/j.1365-2699.2011.02551.x
Volume 38
Issue 11
Start page 2106
End page 2121
Total pages 16
Place of publication Oxford, U.K.
Publisher Wiley-Blackwell Publishing
Language eng
Formatted abstract
Aim  We sought to quantify geographical variation in the stable isotope values of mouse lemurs (Microcebus) and to determine whether this variation reflects trophic differences among populations or baseline isotopic differences among habitats. If the latter pattern is demonstrated, then Microcebus can become a proxy for tracking baseline habitat isotopic variability. Establishing such a baseline is crucial for identifying niche partitioning in modern and ancient communities.

Location  We studied five species of Microcebus from eight distinct habitats across Madagascar.

Methods  We compared isotopic variation in C3 plants and Microcebus fur within and among localities. We predicted that carbon and nitrogen isotope values of Microcebus should: (1) vary as a function of abiotic variables such as rainfall and temperature, and (2) covary with isotopic values in plants. We checked for trophic differences among Microcebus populations by comparing the average difference between mouse lemur and plant isotope values for each locality. We then used multiple regression models to explain spatial isotope variation in mouse lemurs, testing a suite of explanatory abiotic variables.

Results  We found substantial isotopic variation geographically. Ranges for mean isotope values were similar for both Microcebus and plants across localities (carbon 3.5–4.0‰; nitrogen 10.5–11.0‰). Mean mouse lemur and plant isotope values were lowest in cool, moist localities and highest in hot, dry localities. Rainfall explained 58% of the variation in Microcebus carbon isotope values, and mean plant nitrogen isotope values explained 99.7% of the variation in Microcebus nitrogen isotope values. Average differences between mouse lemur and plant isotope values (carbon 5.0‰; nitrogen 5.9‰) were similar across localities.

Main conclusions  Isotopic data suggest that trophic differences among Microcebus populations were small. Carbon isotope values in mouse lemurs were negatively correlated with rainfall. Nitrogen isotope values in Microcebus and plants covaried. Such findings suggest that nitrogen isotope values for Microcebus are a particularly good proxy for tracking baseline isotopic differences among habitats. Our results will facilitate future comparative research on modern mouse lemur communities, and ecological interpretations of extinct Holocene communities.
Keyword Crassulacean acid metabolism
Habitat variability
Madagascar
Microcebus
Mouse lemur
Rainfall
Stable isotopes
Trophic level
delta C-13
delta N-15
Stable-isotopes
Feeding ecology
Rain-forest
Northwestern Madagascar
Propithecus-diadema
Nitrogen isotopes
Natural-abundance
delta-N-15 values
C-13/c-12 ratios
Carbon isotopes
δ13C
δ15N
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 31 times in Thomson Reuters Web of Science Article | Citations
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