Habitat factors and the presence or absence of otters Lutra lutra in Denmark

Madsen, Aksel Bo; Prang, Allan

doi:10.1007/bf03192426

Cited by 14 publications

(3 citation statements)

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“…Among the locations assessed, the most frequent marine otter sign observed was spraints (77%), while direct observations were scarce. Spraints as an indicator of presence has been widely used in studies of otter from the genera Lontra and Lutra (Hong et al, 2020; Madsen & Prang, 2001). Spraints are considered conspicuous signs that assist the population assessment of elusive species such as otters.…”

Section: Discussionmentioning

confidence: 99%

Insights into marine otter (Lontra felina) distribution along the Peru coastline

Ortiz‐Alvarez¹,

Alfaro‐Shigueto

Mangel

2021

Marine Mammal Science

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The marine otter (Lontra felina) has a patchy distribution associated with rocky coastlines along the Pacific coast of South America. In Peru marine otters are found from La Libertad (8°04′S) to Tacna (18°09′S), however, few studies have assessed its population and conservation status. To assess marine otters' current distribution along the Peru coastline, we conducted visual surveys and collected environmental characteristics such as human presence and habitat type. We surveyed 20 locations from five regions where otter presence was based on signs of detection (spraints, food leftovers, tracks, or direct observations). In addition, data on human presence, habitat type, and geographic location were also collected. Across the 20 locations, 268 sections were scanned, and marine otters were detected in 90% (n = 18) of locations and in 19% (n = 52) of sections. Spraints were the most frequent sign detected while direct observations occurred only in seven locations. Our analysis indicates habitat features play an important role in marine otter presence, with habitats with large rocks providing preferred conditions. Our study provides information on marine otter distribution along the Peru coastline that can assist in the identification of locations for focused conservation initiatives and strategies, which should be coordinated among regions to strengthen their design and implementation.

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Section: Discussionmentioning

confidence: 99%

Insights into marine otter (Lontra felina) distribution along the Peru coastline

Ortiz‐Alvarez¹,

Alfaro‐Shigueto

Mangel

2021

Marine Mammal Science

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“…Madsen and Prang (2001) and Delibes et al (2009) concluded that otter must be treated with care as an indicator of good aquatic habitat quality. Despite that our research did not consider several important environmental parameters, such as water quality or food supply, the evident change in tolerance to habitat characteristics recorded in our study leads to a similar conclusion that presence–absence data for expanding otter populations should not be considered as a reliable indicator of habitat quality.…”

Section: Discussionmentioning

confidence: 99%

Habitat correlates of the Eurasian otter Lutra lutra recolonizing Central Poland

2012

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The increase in Eurasian otter Lutra lutra populations in their natural range and recolonization processes are recently observed in several European countries. We address the process of otter recolonization and habitat utilization in Central Poland over 14 years. Field surveys in 1998 and 2007 documented increase in occurrence of the species. The frequency of positive sites denoted 15 % in 1993, 38 % in 1998, and 89 % in 2007. Otter occurrence at study sites was positively affected by river width while negatively affected by presence of buildings at the site and river regulation. During the most intensive colonization process in the 1990s, the habitat preferences of the otter did not change. However, the sites inhabited by otters after 1998 were characterized by lower river width and tree cover and were more often located on regulated river sections, suggesting change in habitat tolerance during expansion. The otter abundance in transformed habitats is a result of increasing population numbers and the necessity to inhabit suboptimal sections of watercourses. Thus, it seems that presence–absence data for otter populations cannot be considered a reliable indicator of habitat quality, being depended of the population density.

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“…The markings of other otter species as Lontra provocax (Thomas, 1908), Lutra lutra (Linnaeus, 1758) and Lontra canadensis (Schreber, 1777) are usually found in areas with less concentrated vegetation, because their visual and scent markings can be better perceived by other individuals (Madsen & Prang 2001, Medina-Vogel et al 2003. However, individuals of the L. longicaudis species, studied by MacDonald & Mason (1987) and Spinola & Vaughan (1995), most often defecate in areas with greater vertical plant cover.…”

Section: Introductionmentioning

confidence: 99%

Use of shelters and marking sites by Lontra longicaudis (Olfers, 1818) in lotic and semilotic environments

Santos

Reis

2012

Biota Neotrop.

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REIS, N.R. Use of shelters and marking sites by Lontra longicaudis (Olfers, 1818) in lotic and semilotic environments. Biota Neotrop. 12(1): http://www.biotaneotropica.org.br/v12n1/en/ abstract?article+bn02512012012Abstract: The Neotropical otter Lontra longicaudis (Olfers, 1818) (Carnivora: Mustelidae) is a semi-aquatic species spread throughout Central and South America, except Chile. It uses cavities on the river banks or spaces amidst dense vegetation as shelter and defecates in conspicuous places as a means of territorial marking. The study was conducted between April 2008 and March 2009, aiming to compare and correlate the frequency of shelter use and marking by the otters, considering vertical vegetation cover, height, distance, disturbance degree and type of structure/substrate factors, in a lotic environment (Sapé stream, São Paulo state, Brazil) and a semi-lotic environment (Canoas I hydroelectric reservoir, Paranapanema Valley, São Paulo and Paraná states, also in Brazil). The aim was to compare and correlate the frequency of shelter use and marking by the otters, considering factors like vertical vegetation cover, height, distance, degree of disturbance and type of structure/substrate in two areas. It was evidenced that the otter's shelters show visual protection differences in each environment. Around the reservoir, the otters make greater use of areas with higher degrees of disturbance and are selective about the type of shelter structure. Along the stream, the otters favor areas with greater vegetation cover to demarcate. Our results warrant emphasis that other abiotic, biotic or density dependent factors (population number and intra or interspecific competition, for example) may be responsible for the otters' different choice of sites used for shelters and markings in the two environments but they were not identified in this study. Moreover, the different number of samples obtained in each location may have harmed the statistical analyses. However, based on the results, we were able to conclude that the species is able to adapt to the altered environment of the reservoir, using shelters and depositing markings according to the imposed environmental conditions and, whenever possible, it takes advantage of the facilitated food capture offered by environment. Nevertheless, the otters still present some dependence on areas with preserved vegetation, where they find sites with better shelter and marking conditions. Keywords: lotic environment, Neotropical otter, scent marking, semilotic environment, shelter sites. Resumo: A lontra neotropical Lontra longicaudis (Olfers, 1818) (Carnivora: Mustelidae) é uma espécie semiaquática distribuída em toda a América Central e do Sul, exceto no Chile. Utiliza cavidades na margem do rio ou espaços entre a vegetação densa como abrigos e defeca em locais conspícuos como função de marcação territorial. O estudo foi realizado entre Abril de 2008 a Março de 2009 e teve como objetivo comparar e correlacionar a frequência de utilização dos abrigos e sítios de marcações d...

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Habitat factors and the presence or absence of otters Lutra lutra in Denmark

Cited by 14 publications

References 14 publications

Insights into marine otter (Lontra felina) distribution along the Peru coastline

Insights into marine otter (Lontra felina) distribution along the Peru coastline

Habitat correlates of the Eurasian otter Lutra lutra recolonizing Central Poland

Use of shelters and marking sites by Lontra longicaudis (Olfers, 1818) in lotic and semilotic environments

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