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Using Non–Invasive Genetic Techniques to Assist in Maned Wolf Conservation in a Remnant Fragment of the Brazilian Cerrado

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Using Non–Invasive Genetic Techniques to Assist in Maned Wolf Conservation in a Remnant Fragment of the Brazilian Cerrado Animal Biodiversity and Conservation 41.2 (2018) Brief communication315 Using non–invasive genetic techniques to assist in maned wolf conservation in a remnant fragment of the Brazilian Cerrado N. Mannise, R. G. Trovati, J. M. B. Duarte, J. E. Maldonado, S. González Mannise, N., Trovati, R. G., Duarte, J. M. B., Maldonado, J. E., González, S., 2018. Using non–invasive ge- netic techniques to assist in maned wolf conservation in a remnant fragment of the Brazilian Cerrado. Animal Biodiversity and Conservation, 41.2: 315–319. Abstract Using non–invasive genetic techniques to assist in maned wolf conservation in a remnant fragment of the Brazilian Cerrado. The maned wolf is a South American canid considered a keystone species of the Cerrado. We performed a genetic assessment of maned wolves that inhabit a small remnant fragment of the Cerrado in Brazil. We collected 84 fecal samples over a year and also included two tissue samples from road–killed animals. We successfully identified the species, sex, and individuals using molecular markers. Using microsa- tellite loci analysis we identified 13 different individuals, eight females and five males. The genetic variability level found and the high number of individuals detected indicates the presence of an open population. Key words: Fecal DNA, Microsatellite loci, ZFX–ZFY, Real time PCR, Neotropical canid Resumen Utilización de técnicas genéticas no invasivas para contribuir a la conservación del aguará guazú en un fragmento residual del Cerrado de Brasil. El aguará guazú es una especie de cánido sudamericano que se considera clave en el Cerrado. Se realizó un estudio genético de varios individuos de aguará guazú que habitan en un pequeño fragmento del Cerrado de Brasil. Se colectaron 84 muestras fecales durante un año y se incluyeron también dos muestras de tejidos de animales atropellados. Se determinaron la especie, el sexo y los individuos mediante marcadores moleculares. Asimismo, se identificaron 13 individuos mediante la amplificación deloci de microsatélites, de los cuales ocho eran hembras y cinco, machos. El grado de variabilidad genética observado y el elevado número de individuos detectados indican la presencia de una población abierta. Palabras clave: ADN fecal, Loci de microsatélites, ZFX–ZFY, PCR en tiempo real, Cánidos neotropicales Received: 9 VII 17; Conditional acceptance: 17 X 17; Final acceptance: 20 XII 17 Natalia Mannise, Susana González, Depto. de Biodiversidad y Genética, Inst. de Investigaciones Biológicas Clemente Estable–MEC, Av. Italia 3318, Montevideo 11600, Uruguay.– Guilherme R Trovati, Centro de Energia Nuclear na Agricultura, Escola Superior de Agricultura 'Luiz de Queiroz'–Univ. de São Paulo, Av. Centenário 303, 13400–970 Piracicaba, SP–Brasil.– J. Mauricio B. Duarte, Núcleo de Pesquisa e Conservação de Cerví- deos, Depto. de Zootecnia, Univ. Estadual Paulista Via de Acesso Paulo Donato Castellane s/n., 14884–900 Jaboticabal, SP–Brasil.– Jesús E. Maldonado, Center for Conservation Genomics, Smithsonian Conservation Biology Inst., Smithsonian Institution, 3001 Connecticut Ave, NW, Washington D.C. 20008, USA.– Susana González, Sección Genética Evolutiva, Fac. de Ciencias–UdelaR, Iguá 4225, Montevideo 11400, Uruguay. Corresponding author: Natalia Mannise. E–mail: [email protected] ISSN: 1578–665 X © 2018 Museu de Ciències Naturals de Barcelona eISSN: 2014–928 X 316 Mannise et al. Introduction crogen and Institute Pasteur–Montevideo. Sequences were compared with the GenBank database using The maned wolf is the keystone canid species of BLAST. We used MEGA 5 software to construct the the Brazilian Cerrado, the largest and richest tropical alignment by Clustal X (Tamura et al., 2011). savanna in the world, and one of the most threatened Sex was determined through Real Time–PCR biomes in South America (Klink and Machado, 2005). (RT–PCR) amplification of a fragment of the ZFX– The IUCN listed it as Near Threatened because of the ZFY genes, and High Resolution Melting Analysis drastic reduction of suitable habitats for their survival. (HRMA) (González et al., 2015a). Experiments were In Brazil it is categorized as Endangered (De Paula conducted in duplicate in a Rotor Gene 6000® (Cor- et al., 2008). The Cerrado is considered 'the central bett Research) (software version 1.7, Qiagen, UK). range of this species', and has lost approximately 50 % We used twelve microsatellite loci that were of its native vegetation (Klink and Machado, 2005). previously established to reliably amplify in maned In this scenario, fragmented and isolated protected wolves and had sufficient levels of polymorphism and areas are too small for their long–term viability (Do adequate non–exclusion probabilities of identity to Passo Ramalho et al., 2014; Lion et al., 2011). It is assign parent pairs (Mannise et al., 2017). Multiplex therefore critical to understand the amount of move- PCR reactions and thermal profile were conducted as ment in and out of these areas. However, only two suggested by Mannise et al. (2017). PCR products studies of maned wolves have been carried out to were run using the LIZ 500 size standard on an ABI monitor population size and genetic diversity at a local PRISM 3100 sequencer. We analyzed fragment size scale in these protected areas (Do Passo Ramalho and genotypes in GENMARKER V1.75 (SoftGenetics). et al., 2014; Lion et al., 2011). Do Passo Ramalho PCRs were repeated three and two times for homo- et al. (2014) analyzed a maned wolf population in zygotes and heterozygotes, respectively. Jataí Ecological Station (São Paulo). The geographic We identified capture histories and the number of distance between Jataí and our study area, the Es- maned wolves resampled from multiple scats using tação Ecológica de Itirapina (EEI), is about 180 km. GENECAP software (Wilberg and Dreher, 2004). Habitat loss and fragmentation could lead to a rapid We detected matching genotypes with a probability and dramatic decline if maned wolves are unable to of 0.01, assuming that individuals could be siblings disperse from one Cerrado patch to another. (Wilberg and Dreher, 2004). The probability of identity Our aim was to assess the population genetic (P(id)) was calculated for Hardy–Weinberg equilibrium diversity of maned wolves in the EEI, an area that (HWE) and for sibling presence. contains a remnant fragment of the Cerrado biome in Genotyping errors were estimated with MICRO- São Paulo (Brazil) near other protected areas where CHECKER (Van Oosterhout et al., 2004); genoty- maned wolf population status have previously been pes were corrected following Brooksfield´s (1996) assessed. Our results provide valuable information to estimation if genotyping errors were detected. We evaluate the population dynamics of maned wolves used GENEPOP (Raymond and Rousset 1995) to at a fine, local scale. compute HWE, linkage disequilibrium (LD) and in- breeding coefficients (Fis). In case of disequilibrium, Bonferroni corrections were applied. We calculated Material and methods number of alleles, expected and observed heterozygo- sity and allele frequencies using CERVUS (Marshall, The EEI (22º 11'–22º 15' S and 47º 51'–48º 00' W, 1998–2007). We applied the ML–RELATE software to São Paulo–Brazil) is inside an array of cultivated analyze the relatedness coefficients and pedigree re- areas (fig. 1). lationships among individuals (Kalinowski et al., 2006). We conducted monthly, six–day sampling surveys using the linear transect method. Each transect was 3 m wide and 200 m long. From March 2007 to Fe- Results bruary 2008, we collected 84 feces samples. Samples were stored in 50 ml sterile plastic tubes with 100 % We identified 58 fecal samples as being from maned ethanol and deposited in a freezer at –20 °C until DNA wolves and we determined the presence of three D– extraction. Two tissue samples were collected from loop haplotypes previously described in other maned road–killed animals of opposite sexes. wolf populations from Brazil (table 1) (González et DNA extractions and PCR amplifications were con- al., 2015b). Of the twelve microsatellite loci tested, ducted under sterile conditions with negative controls one (AHTK253) showed low amplification success. in Núcleo de Pesquisa e Conservação de Cervídeos Samples with at least six reliable genotypes after (UNESP, Brazil). We used DNA Stool Mini Kit (Qiagen replicates were included in further analyses. Inc. Valencia–California), following the manufacturer's We determined the presence of 13 different indivi- instructions. DNA extractions from tissues were con- duals sampled with P(id) = 3.57 x 10–11 for HWE and ducted following González et al. (2015a) procedures. 1.18 x 10–4 for siblings (table 1, fig. 1). P(id) values For species identification, we amplified a species– were acceptable for accurate individual identification specificD–loop fragment of mitochondrial DNA (mtD- (< 0.05) (Woods et al., 1999). NA) using the protocols of González et al. (2015b). We assigned eight females and five males based The PCR products were purified using Zymo Research on the melting curve pattern (table 1). The mean DNA Clean and ConcentratorTM and sequenced in Ma- melting curve was 82.95 ºC (SD = 0.22) for ZFX, and Animal Biodiversity and Conservation 41.2 (2018) 317 LG1 LG10 LG12 LG13 LG17 LG20 LG21 LG22 LG23 LG27 LG6 LG8 LG9 1 mi Fig. 1. Samples collected in the EEI. Each symbol represents a different individual; same shape represents re–sampled individuals. Road–killed animals and its re–sampled feces are shown by balloons. Fig. 1. Muestras colectadas en la estación ecológica de Itidapina (EEI). Cada símbolo representa distintos individuos; la misma forma representa individuos que se han muestreado más de una vez. Los animales atropellados y sus muestras fecales muestreadas más de una vez se indican con globos. 82.08 ºC (SD = 0.17) for ZFY. The observed sex ratio other population heterozygosity estimates of maned was not significantly different from the expected 1:1 wolf populations in Brazil (0.71 and 0.72) (Do Passo 2 (X = 0.69, p = 0.41). Ramalho et al., 2014; Lion et al., 2011).
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