Habitat use and spatial behaviour of the endangered Southern river otter (Lontra provocax) in riparian habitats of Chile: Conservation implications

Sepúlveda, Maximiliano A.; Bartheld, José Luis; Monsalve, René; Gómez, Vicente Clemente; Medina-Vogel, Gonzalo

doi:10.1016/j.biocon.2007.08.026

Cited by 32 publications

(27 citation statements)

References 27 publications

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“…This habitat was used as a proxy to represent the river otter primary habitat (Sepúlveda et al, 2007); 2) Forest Foray: defined as a foray with dog locations >50 m inside of a continuous native forest patch . This is the primary habitat for pudu (Silva-Rodríguez and Sieving, 2012), guigna (Dunstone et al, 2002) and Darwin's fox (Jiménez, 2007); 3) Reserve Foray: defined as forays with dog locations within the limits of the VCR; 4) Park Foray: defined as a foray with dog locations within the limits of the ACNP.…”

Section: Habitat Classification and Analysis Of Dog Habitat Use And Fmentioning

confidence: 99%

Fine-scale movements of rural free-ranging dogs in conservation areas in the temperate rainforest of the coastal range of southern Chile

Sepúlveda¹,

Pelican²,

Cross³

et al. 2015

Mammalian Biology

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Section: Habitat Classification and Analysis Of Dog Habitat Use And Fmentioning

confidence: 99%

Fine-scale movements of rural free-ranging dogs in conservation areas in the temperate rainforest of the coastal range of southern Chile

Sepúlveda¹,

Pelican²,

Cross³

et al. 2015

Mammalian Biology

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“…At each site in freshwater habitats, we followed established protocol by searching for otter signs (footprints/droppings) along rivers (one riverbank), lake shores or the coast for 600 m (the distance generally used in other aquatic mustelid surveys; Bonesi & Macdonald, 2004). The distance between survey locations was 4-8 km to reduce the risk of one home range spanning two survey strips (Chehébar, 1985following Macdonald, 1983, although home ranges may measure 11 km (Sepulveda et al, 2007). Along the coastlines, we surveyed transects of variable lengths, depending on accessibility and coastal characteristics.…”

Section: Methodsmentioning

confidence: 99%

“…avoiding the inclusion of unsuitable habitat) and it is generally recommended to estimate this using grids. In the case of the Nahuel Huapi National Park, we used two different grids comprised of cells of: (a) 11 km 9 11 km and (b) 5 km 9 5 km, where the length of cell sides correspond to the mean home range estimated by Sepulveda et al (2007), and half this length, respectively. Figure 1 displays the present distribution of L. provocax in Argentina.…”

Section: Methodsmentioning

confidence: 99%

“…To assess 'extent of occurrence' (IUCN criterion B, IUCN, 2001), we measured the area of minimum convex polygons (Convex Hulls around points v 1.2 Jenness, 2004, extension for Arc View 3.2) containing all sites with evidence of otters, grouping those that were less than 100 km apart, always connected by water systems, bearing in mind that the greatest distance known to have been travelled by a dispersing huillin is 46 km (Sepulveda et al, 2007). The estimation of 'area of occupancy' is defined by the IUCN as the area within the extent of occurrence that is effectively used by the taxon (e.g.…”

Section: Methodsmentioning

confidence: 99%

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Defining conservation status using limited information: the case of Patagonian otters Lontra provocax in Argentina

et al. 2010

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The Southern river otter or huillín Lontra provocax has been classified as 'endangered', with the loss of riparian forest identified as the main threat to its survival. We used new information on distribution from Argentina to define their status. There are no data on the huillin's population structure and dynamics, and no estimate of its abundance or population trends at a relevant scale. Our survey teams covered 435 locations in lakes, rivers and coastal sites using a standard and repeatable methodology of 600 m survey transects as adopted for otter surveys across Europe. We found that its present geographic range in Argentina is slightly larger than is characteristic of a species at risk of extinction at the national level, although its contemporary distribution is still radically contracted in comparison to its historical distribution.

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“…Because the riparian zone harbors a wide variety of animals, and different species or taxa respond differently to environmental conditions, preferable conditions for the habitat should be evaluated according to multiple taxa. However, although many mammalian species are considered to prefer the riparian zone (i.e., Helfield and Naiman 2006;Maisonneuve and Rioux 2001;Sepulveda et al 2007), limited studies have focused on terrestrial mammals. Bats, relatively well-studied riparian-dwelling mammals, are one of the largest taxa, which accounts for a quarter of the whole mammalian species (Kunz and Fenton 2003).…”

Section: Introductionmentioning

confidence: 99%

Relative importance of the environmental factors at site and landscape scales for bats along the riparian zone

Akasaka

Yanagawa

2010

Landscape Ecol Eng

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To conserve and manage the bat population in an agricultural landscape, we investigated the relative importance of environmental factors on their occurrence and abundance in riparian zones at site and landscape scales. From May to October 2003, four bat species (Myotis daubentonii, M. frater, Plecotus auritus, and Eptesicus nilssonii) were mist-netted at 26 sampling sites in five streams in the Tokachi plain in central Hokkaido, northern Japan. The environmental factors of the two scales were measured at each sampling site. To clarify the most suitable landscape scale for bats, we also compared three spatial extents (250, 500, and 750 m) at each site. Generalized linear mixed models revealed that the occurrence and/or abundance of all four species, except for M. frater, was positively correlated with the percent cover of broadleaved deciduous forest and the height of bank-side tree canopy. Additionally, according to variation partitioning, although the value of the pure effect varied among species and measurement types, the site scale had a relatively larger pure effect than the landscape scale in many cases. However, in three of the five combined models, the proportion of confounding effect was much larger than that of the pure effect at the respective scales. Our study demonstrated that streams adjacent to a well-developed broadleaved deciduous forest are important for night habitats of many bat species in an agricultural landscape. Although focusing on the site scale may be important for bat conservation, we strongly stress the necessity for conservation and management plans at multiple scales.

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Habitat use and spatial behaviour of the endangered Southern river otter (Lontra provocax) in riparian habitats of Chile: Conservation implications

Cited by 32 publications

References 27 publications

Fine-scale movements of rural free-ranging dogs in conservation areas in the temperate rainforest of the coastal range of southern Chile

Fine-scale movements of rural free-ranging dogs in conservation areas in the temperate rainforest of the coastal range of southern Chile

Defining conservation status using limited information: the case of Patagonian otters Lontra provocax in Argentina

Relative importance of the environmental factors at site and landscape scales for bats along the riparian zone

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