Estimation of European Otter (Lutra Lutra) Population Size by Fecal Dna Typing in Southern Italy

Prigioni, Claudio; Remonti, Luigi; Balestrieri, Alessandro; Sgrosso, Silvia; Priore, Giuseppe; Mucci, Nadia; Randi, Ettore

doi:10.1644/05-mamm-a-294r1.1

Cited by 54 publications

(51 citation statements)

References 17 publications

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“…In the River Sinni, fish form the bulk of otter diet, whilst in the surrounding rivers otters show a great adaptability, preying on fish, amphibians and crustaceans (Remonti et al 2008). In the Pollino National Park and surrounding areas, spraint distribution (Prigioni et al 2005) and genetic typing of fresh faeces (Prigioni et al 2006b) revealed a stable and relatively abundant otter population (0.18-0.20 individuals/ km of watercourse).…”

Section: Study Areamentioning

confidence: 99%

Eurasian otter (Lutra lutra) prey selection in response to a variation of fish abundance

Remonti

Prigioni

Balestrieri

et al. 2010

Italian Journal of Zoology

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In 2001 and 2002 we studied Eurasian otter (Lutra lutra) fish selection in southern Italy by comparing otter diet (805 analysed spraints) with fish availability, estimated by electrofishing. The surveyed river was dominated by cyprinids, particularly by chub (Leuciscus cephalus), roach (Rutilus rubilio) and bleak (Alburnus sp.). Roach and chub were the most common prey recorded in spraints. Otters ate mainly small prey (total length < 90 mm). Chub were widely consumed according to abundance, whilst roach and bleak consumption was not proportionate to their availability. Otters selected roach both in 2001 and 2002 and responded to a decrease in roach availability (-27.3%) by increasing their frequency of consumption rather than switching to an alternative prey. Despite their high abundance, bleak seemed to be markedly avoided by otters. We hypothesized that differences in microhabitat selection may influence the susceptibility of cyprinids to otter predation. The possible effects on fish community were briefly discussed.

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Section: Study Areamentioning

confidence: 99%

Eurasian otter (Lutra lutra) prey selection in response to a variation of fish abundance

Remonti

Prigioni

Balestrieri

et al. 2010

Italian Journal of Zoology

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“…La medición de densidades por unidad de superficie en el agua es una tarea que por su dificultad raramente se ha acometido (Kruuk 1995, Sulkava 2007, RuizOlmo et al 2011. Recientemente se han utilizado técnicas genéticas (Hung et al 2004, Prigioni 2006, Prigioni & Remonti 2006, Arrendal et al 2007, Hájková et al 2008, Koelewijn & Pérez-Haro 2010, Lanszki et al 2010) y métodos de captura-recaptura basada en identificación de genotipos (Lampa et al 2013) pero también muestran ciertas limitaciones relacionadas con la técnica y el coste del análisis que limita el número de muestras y con ello la precisión. Asimismo se ha descrito la metodología del fototrampeo para la detección de la especie (Jones & Raphael 1993).…”

Section: Introductionunclassified

Estima de la población de nutria en las Tablas de Daimiel mediante captura-recaptura espacial y muestreo de distancias

Jiménez¹,

Carrasco²,

Feliu³

2014

Galemys

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Species management should be based on accurate estimations on the size and density of the target population. In the case of the otter, these estimations are difficult to obtain due to their habitat, low densities and elusiveness, and these have relied mainly on surveys of animal signs or on specific ad hoc methods, and lately, in genotyping. We have applied newly-developed spatial capture-recapture model to estimate the otter population of the Tablas de Daimiel National Park by a spatially explicit capture-recapture of unmarked individuals using camera trapping-data together with distance sampling. The density estimated is 0.557 (±0.317) otters/100 ha, and we have achieved reliable information about activity, movements, and space use.

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“…Overall, most conflict cases were reported in nutrientrich (i.e., eutrophic) waters, particularly in freshwater aquaculture ponds, lakes, and coastal areas, supporting the idea that cormorant distribution is, in part at least, determined by the nutrient status of these waters (Carss 2003). Eurasian otters Lutra lutra and managed fisheries in Central Europe, mostly carp Cyprinus carpio production, is another example of a widely studied conflict, focusing on otter diet (Gossow and Kranz 1998;Kloskowski 2000Kloskowski , 2005bAdámek et al 2003;Lanszki and Molnár 2003;Jacobsen 2005;Poledník 2005), damage assessment (Bodner 1995a;Gossow and Kranz 1998;Kloskowski 2005b;Poledník 2005;Kranz et al 2009), damage prevention (Bodner 1995b;Gossow and Kranz 1998;Leblanc 2003;Kranz et al 2009), and compensation schemes (Gossow and Kranz 1998;Schwerdtner and Gruber 2007;Kranz et al 2009). This type of biological and socio-economic information is critical for resource management, conflict resolution, and species conservation because it allows a wise application of mitigation, compensation, and species protection measures.…”

Section: Introductionmentioning

confidence: 94%

Key landscape factors for Eurasian otter Lutra lutra visiting rates and fish loss in estuarine fish farms

2009

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Conflicts between the conservation of large vertebrates and the use of biological resources are common and affect many species and activities. The vast majority of the Portuguese fish farms are located in estuarine protected areas and production of marine fish species is done mostly in semi-intensive regimes and with the imposition of some restrictive rules. This exposed form of production is prone to predation by wild animals. The Eurasian otter Lutra lutra is widely distributed in Portugal and this combination of factors has led to a conflict scenario between fish farming and the conservation of otters. This study aimed to determine the influence of landscape factors in otter damages in fish farms of Sado estuary (SW Portugal) and the usefulness of visiting rates and otter diet as surrogates for damage assessment. The impact of otter predation (damage) in each fish farm was assessed by combining the percentage of consumption of reared species with otter daily food consumption, daily visitation rates, and number of otters visiting each fish farm. Landscape descriptors were recorded in the field and several landscape metrics were calculated using a geographic information system. Multiple linear regressions were used to identify key landscape factors for damage and for damage surrogates. Distance to streams and refuge cover areas were identified as key landscape features to damages. This information can be used as a management tool in landscape planning, specifically in estuaries with fish-farming activity, as highrisk farms can be identified and selectively protected.

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Estimation of European Otter (Lutra Lutra) Population Size by Fecal Dna Typing in Southern Italy

Cited by 54 publications

References 17 publications

Eurasian otter (Lutra lutra) prey selection in response to a variation of fish abundance

Eurasian otter (Lutra lutra) prey selection in response to a variation of fish abundance

Estima de la población de nutria en las Tablas de Daimiel mediante captura-recaptura espacial y muestreo de distancias

Key landscape factors for Eurasian otter Lutra lutra visiting rates and fish loss in estuarine fish farms

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