Parasite load in the Iberian ibex, Capra pyrenaica victoriae

Refoyo, P.  Olmedo, C.  Barba, M.  Muñoz, B. 

DOI: https://doi.org/10.32800/amz.2016.14.0108

Key words

Iberian ibex, Parasites, National Park, Faecal sample

Reception date: 09/02/2016  |   Acceptation date: 10/05/2016  |   Publication date: 29/06/2016

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Parasite load in the Iberian ibex, Capra pyrenaica victoriae

Refoyo, P.  Olmedo, C.  Barba, M.  Muñoz, B. 

Abstract

Parasite load in the Iberian ibex, Capra pyrenaica victoriae
Parasitic infections in the Iberian ibex are common, serious and well documented. Most studies, however, focus on the subspecies Capra pyrenaica hispanica, found in the south and east of the Iberian peninsula, and few studies have investigated the subspecies Capra pyrenaica victoriae in the centre of  the peninsula. Here we add to the information about C. p. victoriae, analyzing samples of this subspecies in the National Park of Sierra de Guadarrama. We found parasites in 97% of samples and identified  a total of 11 helminth taxa. The most abundant genus in the analysis was Muellerius. Despite the frequency of parasites,  the general health of the population seemed good.

Key words: Iberian Ibex, Parasites, National Park, Faecal sample

Resumen

Carga parasitaria de la cabra montés Capra pyrenaica victoriae
Las infecciones parasitarias en las cabras montesas ibéricas son frecuentes, graves y están bien documentadas. Sin embargo, la mayoría de trabajos se centran en la subespecie Capra pyrenaica hispanica, distribuida por el sur y el este de la península ibérica, mientras que hay pocos estudios dedicados a la subespecie presente en el centro de la península, Capra pyrenaica victoriae. Aquí aportamos información sobre C. p. victoriae, analizando muestras coprológicas de esta subespecie en el Parque Nacional de la Sierra de Guadarrama. Hemos encontrado parásitos en el 97% de las muestras e identificado un total de 11 taxones de helmintos. El género más abundante en los análisis ha sido Muellerius. En cualquier caso, la salud de la población parece, en general, buena de tal forma que las cargas parasitarias detectadas no influyen aparentemente de manera determinante en el estado de salud de la población.

Palabras clave: Cabra montés, Parásitos, Parque Nacional, Muestra fecal

Resum

Càrrega parasitària de la cabra salvatge Capra pyrenaica victoriae
Les infeccions parasitàries en les cabres salvatges ibèriques són freqüents, greus i estan ben documentades. Tanmateix, la major part de treballs se centren en la subespècie Capra pyrenaica hispanica, distribuïda al sud i l’est de la península ibèrica, mentre que hi ha pocs estudis dedicats a la subespècie present al centre de la península, Capra pyrenaica victoriae. Aquí aportem informació sobre C. p. victoriae després d’analitzar mostres coprològiques d’aquesta subespècie al Parc Nacional de la Serra de Guadarrama. Hem trobat paràsits en el 97% de les mostres i hem identificat un total d’11 taxons d’helmints. El gènere més abundant en les anàlisis ha estat Muellerius. En qualsevol cas, en general la salut de la població sembla bona, per la qual cosa les càrregues parasitàries detectades no influeixen aparentment de manera determinant en l’estat de salut de la població.

Paraules clau: Cabra salvatge, Paràsits, Parc Nacional, Mostra fecal

Introduction

Parasitic infections in Iberian ibex are many and  serious,  and they are widely documented. This is borne out in the  approximately 100 micro-  and macroparasites described in data relating to the living populations in Spain (Pérez et al., 2006). Abomasal (Ostertagia spp. and Haemonchus spp.), intestinal (Nematodirus spp., Moniezia spp., Eimeria spp.), hepatic (Fasciola hepatica and Dicrocoelium spp.) (Pérez et al., 2006; Alasaad et al., 2008) and pulmonary parasites (Protostrongylidae sp., Dictyocaulus spp.) (Acevedo & Cassinello, 2009; Alasaad et al., 2009) are frequently detected in the individuals analyzed.

Most studies on the species, however, correspond to the subspecies Capra pyrenaica hispanica (Cabrera, 1914), with  very few works being related to subspecies C. p. victoriae (Cabrera, 1914) in the central peninsula (Moreno Casero et al., 2007; Ramajo Martin et al., 2007; Barba, 2015). This work aims to characterize the pulmonary and digestive nematode fauna of C. p. victoriae  in  central Spain.

Material and methods

In 2014, we collected 40 faecal samples of an Iberian ibex population in the National Park of Sierra de Guadarrama. Collection of faecal samples is a common technique to analyze the parasite load (Pfukenyi et al., 2007; Painer et al., 2011). This analysis limits the collection of parasites to particular groups (related to the digestive tract) and generally, to certain phases (eggs or  larvae) that use the digestive system as a means of dispersion of infective forms. However, the collection of samples is easier and avoids the need to capture the individual (Marreros et al., 2012).

For the sampling collection, we followed  a group of Iberian ibex and immediately collected defecation from the soil (Willisch & Neuhaus, 2009). All samples were collected in autumn, when the parasite prevalence is highest (Pérez, 2001), and bagged and labelled. Faecal samples were collected in the morning, stored at temperatures < 20°C, and analyzed the same day (Painer et al., 2011).

We used Ritchie’s biphasic concentration method to locate the parasites in the faeces (Allen & Ridley, 1970). This standard technique, according to Kaufmann (1996), is useful for the later  microscopic analysis of trematode and nematode eggs (Luzón et al., 2008). It  uses 10% formalin and ethyl ether to remove the organic matter of parasitic elements (Beltrán et al., 2003) by performing successive centrifugations (Barba, 2015). This procedure allows treatment of a considerable faeces mass, facilitating the identification of rare parasitic elements or parasites whose distribution is irregular in the faecal mass. (Gibbons et al., 2009, Hendrix & Robinson, 2011). We examined 3 g of faeces (5 ml) from  each sample to morphologically identify the parasites to genus level with the aid of an ocular micrometer at 40x and 100x magnification (Marreros et al., 2012). This morphological identification was performed using the keys proposed by Soulsby (1986), Kaufmann (1996), Van Wyk et al. (2004) and Gibbons et al. (2009).

Due to the morphological similarity of the eggs of Nematodirus and Marshallagia spp., we were unable  to distinguish between them using  the diagnostic methods applied in this study. Similarly, strongylid eggs other than Nematodirus/Marshallagia spp. were not further differentiated and should also be considered as ”gastrointestinal strongylids” (Marreros et al., 2012).

Results

We detected parasitic species in all but two samples. In total, we identified 11 helminth taxa (one trematode and 10 nematodes). The most abundant genus in the analysis was Muellerius sp. , detected in 25 of the 40 samples analyzed (66%) (table 1).

Refoyo_et_al_tabla_1

Helminths were  detected in 97% of samples. Besides the genus Muellerius sp., the genera Skrjabinema sp. (42.11%) and Nematodirus/Marshallagia (23.68%) were also abundant as gastrointestinal strongylids (18. 42%). The other genera detected were Bunostomum sp., Telodorsagia sp., Trichuris sp., Cooperia sp. and Ostertagia sp. Among bronchopulmonary nematoda, and beside Muellerius sp., the presence of the genus Dictyocaulus sp. (7.89%) was of note (table 1). We also found eggs of Ascaris sp. The fact that no  species of this genus have been previously detected in this host suggests this is a spurious parasite, possibly explained bythe goats’ direct ingestion of eggs and its subsequent expulsion in faeces. Cestodes were not detected in the analyzed samples and only  one trematode, Dicrocoelium sp. (prevalence 2.6%). was identified (table 1).

Discussion

Several studies have  analyzed parasites in an Iberian ibex population (Capra pyrenaica victoriae) in the central Iberian peninsula, particularly the work developed by Ramajo Martín et al. (2007) in Salamanca (west central Spain), Moreno Casero et al. (2007)  in Extremadura, and Barba (2015) in Sierra de Guadarrama. The total number of genera in our study was similar to these previous works despite the scarce number of samples analyzed and  we detected two genera not previously mentioned for the subspecies. However, we did not detect cestodes, as occurred with a high prevalence in two of the other studies (Moreno Casero et al., 2007; Ramajo Martin et al., 2007). Our methodology focused  on the  coprological analysis of samples rather than on the study of tissue biopsies (mainly muscle), however, and this could explain why we did not detect this genus in our study (Luzón et al., 2008). Although sedimentation is the best method to detect eggs, many cestodes remove the gravid proglottids directly outside, so the eggs are very difficult to be detected with traditional coprological techniques (Garijo et al., 2005).

The number of infected individuals in our study, however, was high, with 97% of individuals showing at least one parasite compared to other studies where the maximum percentage reached 72%. The techniques used for the concentration of parasites in the samples  may have influenced this difference: we used Ritchie’s biphasic concentration method while Ramajo Martin et al. (2007) used zinc sulfate flotation methods and the Parfitt method (1958). Our values are even higher than the 92% of individuals detected in the study of Moreno Casero et al. ( 2007), possibly indicating a greater degree of parasitosis in the population in the Sierra de Guadarrama.

Trematoda was limited to 3% of specimens. This value is higher than that detected in the Andalusian population but lower than the data obtained in previous works in this subespecies (Moreno Casero et al., 2007).

Muellerius sp. (Muller, 1889) was the most abundant genus detected in our study. This genus was  also abundant in populations of C. p. hispanica (Pérez, 2001) and C. p. victoriae (Moreno Casero et al., 2007) in central Spain and in other species of the genus Capra (Marreros et al., 2012), but it has not been detected in the northern C. p. victoriae populations (McCraw & Menzies, 1986).

It is the first time that the presence of genera Cooperia and Dyctiocaulus is cited for populations of C. p. victoriae. Dyctiocaulus has been described for the subspecies C. p. hispanica (Pérez et al., 2001) and other species of the genus Capra (Marreros et al., 2012) and the genus Cooperia,  usual in domestic goats, has not been previously described for wild species. On the other hand, we did not detect other genus detected in other studies, such as Haemonchus, Trichostrongylus, Oesophagostomum (Moreno Casero et al., 2007).

Overall, Nematoda were more abundant in populations of C. p. hispanica than in C. p. victoriae. However, the diversity of species was  greater in C. p. victoriae  than in the C. p. hispanica subspecies.

Our findings add to the knowledge on intestinal and pulmonar parasites of Capra pyrenaica victoriae and show that although there are qualitative and quantitative differences between Iberian ibex subspecies, these do not seem particularly relevant.

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