A comparison of methodologies used in the detection of the Pyrenean desman Galemys pyrenaicus (E. Geoffroy, 1811)

González‐Esteban, Jorge; Villate, Idoia; Castién, Enrique

doi:10.1078/1616-5047-00107

Cited by 9 publications

(16 citation statements)

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“…Esta concentración de las capturas en las dos primeras noches también ha sido observada por González-Esteban et al (2003).…”

Section: Trampeounclassified

“…Agirre-Mendi, 2004 Como todos los métodos, presenta algunas limitaciones, pero en conjunto es altamente fiable y eficiente. La idoneidad de la prospección de excrementos como método de aplicación general para el estudio de la distribución del desmán se ha discutido en algunos trabajos (González-Esteban et al, 2003) y, en general, ha sido objeto de un debate recurrente y bastante estéril, que aún sigue vivo en algunos ámbitos. Aunque en algunos casos deben haber influído el diseño de la prospección o las condiciones físicas de los tramos explorados, parece que la mayor parte de los resultados poco satisfactorios con este método tienen más relación con la falta de pericia personal en el muestreo que con unas improbables condiciones especiales de determinadas zonas geográficas o ríos.…”

Section: Prospección De Excrementosunclassified

“…En la cabecera del Aragón Subordán (valle de Echo o Hecho, por encima del desfiladero de la Boca de lo Infierno) se localiza la única población aragonesa de la especie (Aymerich & Gosàlbez, 2004a). En Navarra el desmán está más bien distribuido, aunque los datos disponibles son bastante antiguos, heterogéneos e incompletos (Castién & Gosál-bez, 1992;González-Esteban et al, 1999). En la subcuenca del Irati, el desmán estaría presente por lo menos en las zonas de cabecera de los ríos Irati, Urrobi y Erro; en el río Salazar, un curso importante de esta subcuenca situado más hacia el este, los datos que conocemos (alrededores de Otsagabia) son muy escasos y no tienen suficiente calidad para asegurar la presencia del desmán, aunque la consideramos probable.…”

Section: A-subcuencas Con Poblaciones De Desmánunclassified

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El desmán ibérico Galemys pyrenaicus (É. Geoffroy Saint-Hilaire, 1811) en los Pirineos meridionales

Aymerich¹,

Gosálbez²

2014

Munibe Monogr., nat. ser.

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RESUMENSe presentan sintéticamente los resultados del conjunto de trabajos sobre el desmán ibérico Galemys pyrenaicus (É. Geoffroy Saint-Hilaire, 1811) realizados en el periodo 2000-2009 en los Pirineos meridionales. Estos trabajos han consistido en el estudio de la distribución y el hábitat (prospección de excrementos en más de 800 tramos fluviales), actividad y uso del espacio (57 individuos marcados con chip de identificación y 33 con radioemisores), y prosiguen con trabajos sobre demografía y genética. Como resultados más interesantes o innovadores para el conocimiento de la especie destacamos los siguientes: 1) El desmán está ausente de gran parte de la vertiente meridional de los Pirineos (Aragón), seguramente por la existencia de barreras biogeográficas que han impedido una recolonización postglacial; es probable que ausencias a gran escala por causas similares se produzcan también en otras zonas geográficas. 2) Dentro del área de distribución se detectan discontinuidades frecuentes a escala local, atribuibles también a causas naturales y no a perturbaciones antrópicas, y además hay indicios de fluctuaciones temporales en la presencia de la especie. 3) Nuestros resultados sobre uso del espacio y actividad invalidan gran parte de lo que se ha publicado previamente sobre estas cuestiones; el desmán se muestra como un animal menos rutinario y de comportamiento más complejo de lo que se suponía. 4) Se han obtenido evidencias de que no es una especie altamente agresiva ni territorial. 5) Los refugios ("nidos") en las riberas son estructuras persistentes y de uso colectivo, seguramente de gran importancia para la conservación de la especie. PALABRAS CLAVE:Comportamiento, distribución, Galemys pyrenaicus, hábitat, seguimiento. ABSTRACTWe present a synthesis of the results obtained from the studies on the desman Galemys pyrenaicus (É. Geoffroy Saint-Hilaire, 1811) in the southern Pyrenees during the period 2000-2009. Distribution, habitat, activity and space use were studied based on the data obtained from faeces prospection in more than 800 river sections, 57 individuals marked with transponders, and 33 radiotracked individuals. Besides, studies on population demography and genetics were also carried out and are currently ongoing. Most intresting results were: 1) The desman is absent from most of the southern slope of the central Pyrenees (aragonese Pyrenees). This is probably due to biogeographical barriers that did not allow a postglacial recolonization of the species. In fact it is likely that large scale absences occur for similar reasons in other geographical areas. 2) Within its distribution range there were frequent discontinuities at local scale probably also due to natural causes and not to human disturbance. Evidences of temporal fluctuations on species presence were also found at local scale. 3) Our results on activity and space use invalidate most of what has been previously published on these aspects; the behaviour of the desman seems to be more complex and not to follow a standard routine. 4) Evide...

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“…Esta concentración de las capturas en las dos primeras noches también ha sido observada por González-Esteban et al (2003).…”

Section: Trampeounclassified

Section: Prospección De Excrementosunclassified

Section: A-subcuencas Con Poblaciones De Desmánunclassified

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El desmán ibérico Galemys pyrenaicus (É. Geoffroy Saint-Hilaire, 1811) en los Pirineos meridionales

Aymerich¹,

Gosálbez²

2014

Munibe Monogr., nat. ser.

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“…In talpids, variation in skull shape during postweaning life has generally been overlooked, probably because of the lack of a conspicuous size increase during this period (Grulich 1967;González-Esteban et al 1999;Ló pez-Fuster et al 2006). The Iberian desman (Galemys pyrenaicus) is a semi-aquatic talpid found in France, Andorra, Spain, and Portugal (Queiroz 1999;Nores et al 2007).…”

Section: Introductionmentioning

confidence: 98%

“…The diet of this species, which generally consists of benthic macroinvertebrates (Castién and Gosálbez 1995), leads to significant and progressive tooth wear during life. Information published on desman growth is limited to brief comments derived from comparative analyses of body dimensions and skull measurements between age classes established by the dental wear of free-living animals (González-Esteban et al 1999;Ló pez-Fuster et al 2006). Such morphometric analyses were based on traditional univariate and multivariate statistical techniques applied to linear measurements.…”

Section: Introductionmentioning

confidence: 99%

Geometric morphometrics of the mandible in the Iberian desman, Galemys pyrenaicus (Mammalia: Soricomorpha): Is there a significant variation in form during post-weaning life?

Ventura

López-Fuster

2010

Mammalian Biology

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Geometric morphometrics was applied on the mandible of the Iberian desman, Galemys pyrenaicus, to determine for the first time possible sexual and post-weaning shape variation of this structure in a talpid species. Analyses were complemented by evaluating the effect of sex and age on size. The sample consisted of collection specimens from locations in the Cantabrian Mountains (northern Spain). Desmans were grouped into four relative age classes according to tooth wear. The shape of the internal side of the mandible was represented by 15 two-dimensional landmarks. Once young desmans leave the nest there is no significant variation in the form (size and shape) of the mandible. Thus, possible osseous changes and tooth abrasion derived from ageing do not produce obvious variation in mandible form. Mandible shape was significantly correlated with mandible size, resulting in a range of shapes that varies from a slender to a robust morphology. This variation was independent of geographic factors. Since the effect of non-heritable environmental influences on mandible size and shape was negligible, it can be considered that the mandible form of post-weaned desmans is the direct product of interactions between different developmental processes.

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Need for speed: Preference for fast‐flowing water by the endangered semi‐aquatic Pyrenean desman (Galemys pyrenaicus) in two contrasting streams

Esnaola

González‐Esteban

Elosegi

et al. 2018

Aquatic Conservation

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1. The Pyrenean desman (Galemys pyrenaicus) is an endangered, semi-aquatic, insectivore mammal, endemic to the northern Iberian Peninsula and the Pyrenees. Owing to its small populations, evasive behaviour, and nocturnal activity, knowledge of its ecological requirements is still limited. Continuing population decline over most of its distribution rangeeven in regions where water quality has clearly improvedpoints to other factors as the main conservation threat. Nevertheless, at present there is a lack of information on its habitat preferences within its area of occupancy (e.g. stream microhabitat characteristics), a key point for assessing or improving its habitat.2. This study used radio-telemetry data to determine the use of space at microhabitat level by the desman, and how this changed depending upon environmental conditions. 3. Desmans were studied in two contrasting rivers in the Basque Country (northern Iberian Peninsula): Elama, a nearly pristine stream, and the Leitzaran, a clean-water stream affected by hydropower diversions. Fifteen desmans were captured and radio-tracked in Elama and 16 were captured and radio-tracked in the Leitzaran, and nocturnal activity points were assigned to one of three habitat types: riffles, runs, or pools. Habitat use was compared against availability to measure habitat selection in each stream and between streams. 4. Desmans selected riffles positively and pools negatively, with this selection being stronger in the Leitzaran. 5. The results highlight the ecological relevance of riffles as foraging habitats of desmans, and therefore as key features for their conservation. It suggests that channel modifications that reduce the areal cover of riffles impair habitat quality for this species. In addition, water diversion for hydropower is likely to be detrimental for desmans, as it reduces discharge and flow velocity in the bypassed river sections.

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A comparison of methodologies used in the detection of the Pyrenean desman Galemys pyrenaicus (E. Geoffroy, 1811)

Cited by 9 publications

References 2 publications

El desmán ibérico Galemys pyrenaicus (É. Geoffroy Saint-Hilaire, 1811) en los Pirineos meridionales

El desmán ibérico Galemys pyrenaicus (É. Geoffroy Saint-Hilaire, 1811) en los Pirineos meridionales

Geometric morphometrics of the mandible in the Iberian desman, Galemys pyrenaicus (Mammalia: Soricomorpha): Is there a significant variation in form during post-weaning life?

Need for speed: Preference for fast‐flowing water by the endangered semi‐aquatic Pyrenean desman (Galemys pyrenaicus) in two contrasting streams

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