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47 results for “Lutra lutra”
Data from: Range reexpansion after long stasis: Italian otters (Lutra lutra) at their northern edge
<p><span>Species range shifts and expansion are subjects of primary research interest in the context of climate warming and biological invasions. Few studies have focused on reexpansion of species that suffered severe declines. Here, we focused on population recovery of Eurasian otters (<em>Lutra</em> <em>lutra</em>) in Italy, first detected in 2003 after a southward range contraction</span><span>. We modelled the rate of range expansion and occupancy at the northern expanding front </span><span>(central Italy)</span><span>, to gain insights into the progress of recovery and mechanisms of reexpansion. We performed a field survey in 2021, </span><span>which redefined the northern limit of distribution further north, in close proximity to the Gran Sasso National Park. Then we analyzed a time series (1985–2021) of distances of northernmost occurrences from the centre of the 1985 range. Using segmented regression, we were able to identify a prolonged stasis of the northern range edge and a simultaneous increase in occupancy from 0.151 to 0.4. A breakpoint was estimated in 2006, after which the range expanded northwards at an average rate of </span><span>5.48 km/year. From 2006 to 2021, the overall northward shift was about 80 km. Occupancy continued to increase until </span><span>2019</span><span> and abruptly declined in 2021. </span><span>These patterns suggest that the reexpansion of the range can be limited by low occupancy at the expanding front. As occupancy increases, long-distance dispersal increases and then range expands. The low occupancy at the current distribution limit of otters may reflect a higher anthropogenic pressure on northern habitats, which could slow down the reexpansion process.</span></p>
Data from: Range reexpansion after long stasis: Italian otters (Lutra lutra) at their northern edge
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Spraints demonstrate small population size and reliance on fishponds for Eurasian otter (Lutra lutra) in Hong Kong
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Country‐wide genetic monitoring over 21 years reveals lag in genetic recovery despite spatial connectivity in an expanding carnivore (Eurasian otter, Lutra lutra) population
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Microplastics in Eurasian otter (Lutra lutra) spraints and their potential as a biomonitoring tool in freshwater systems
<p>The ubiquitous nature of microplastics in aquatic ecosystems may have serious implications for aquatic biota. While microplastic research in freshwater ecosystems is increasing, very few studies have assessed the physical presence of microplastics among top predators. The Eurasian otter (<i>Lutra lutra</i>), a top predator of aquatic ecosystems, is one of the most widely distributed otter species and has a broad habitat niche. The opportunistic collection of otter spraints (i.e. feces) presents a valuable opportunity to assess pollutants of freshwater ecosystems through non-invasive means. Here we assessed the prevalence, abundance and concentration of microplastics (100 µm to 5 mm), as well as dietary remains, in 53 spraint samples collected over eight river catchments spanning three regions of Ireland. We found microplastics present in 57% of spraints at an abundance of 1.2 ± 0.1 microplastics (MPs)/spraint (mean ± SE) and a concentration of 3.8 ± 0.6 MPs/g (dry weight). Fibers were the dominant particle type recovered (85%), followed by film (10%). No significant differences in microplastic concentrations were detected between the three regions assessed, or between spraints collected from areas upstream (i.e. 'lower' exposure) or downstream ('higher' exposure) of putative microplastic sources, which were defined using spatial vector data. While microplastic concentrations were not explained by spraint condition (i.e. fresh, drying or dry), spraints collected in autumn had a significantly higher concentration than spring and summer. Furthermore, microplastic abundance or concentration could not be linked to dietary composition based on the items identified. From a trophic perspective, this study showed that the presence of microplastics in the feces of otter are most likely being obtained through its prey (i.e. secondary ingestion). While there may be limitations associated with using spraints as a biomonitoring tool for microplastics in freshwater systems, particularly with respect to otter home range and dietary niche breadth, they could still be employed for a regional assessment of microplastic levels.</p>
On following pages: 29. Marine Otter (Lontra felina); 30. Neotropical Otter (Lontra longicaudis); 31. Southern River Otter (Lontra provocax); 32. Sea Otter (Enhydra lutris); 33. Spotted-necked Otter (Hydrictis maculicollis); 34. Eurasian Otter (Lutra lutra); 35. Hairy-nosed Otter (Lutra sumatrana); 36. African Clawless Otter (Aonyx capensis); 37. Asian Small-clawed Otter (Aonyx cinereus); 38. Smooth-coated Otter (Lutrogale perspicillata). in Mustelidae
On following pages: 29. Marine Otter (Lontra felina); 30. Neotropical Otter (Lontra longicaudis); 31. Southern River Otter (Lontra provocax); 32. Sea Otter (Enhydra lutris); 33. Spotted-necked Otter (Hydrictis maculicollis); 34. Eurasian Otter (Lutra lutra); 35. Hairy-nosed Otter (Lutra sumatrana); 36. African Clawless Otter (Aonyx capensis); 37. Asian Small-clawed Otter (Aonyx cinereus); 38. Smooth-coated Otter (Lutrogale perspicillata).
Fig. 3 in Lutra lutra (Carnivora: Mustelidae)
Fig. 3.—Geographic distribution of Lutra lutra. Map redrawn from (Romanowski et al. 2010). Subspecies are: 1, L. l. angustifrons; 2, L. l. aurobrunnea; 3, L. l. barang; 4, L. l. chinensis; 5, L. l. hainana; 6, L. l. kutab; 7, L. l. lutra; 8, L. l. meridionalis; 9, L. l. monticolus; 10, L. l. nair; 11, L. l. seistanica; and 12, L. l. whiteleyi.
Fig. 2 in Lutra lutra (Carnivora: Mustelidae)
Fig. 2.—Dorsal, ventral, and lateral views of skull and lateral view of mandible of an adult female Lutra lutra. Photograph taken by Chris Conroy at the Museum of Vertebrate Zoology, University of California, Berkeley (Museum of Vertebrate Zoology [MV] Mamm:34264) used with permission. Total skull length is 10.9 cm.
Microplastics in Eurasian otter (Lutra lutra) spraints and their potential as a biomonitoring tool in freshwater systems
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Supplementary material 9 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Figure S3
Supplementary material 10 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Figure S4
Supplementary material 11 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Figure S5
Supplementary material 8 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Figure S2
Supplementary material 12 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Figure S6
Supplementary material 7 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Figure S1
Supplementary material 3 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Appendix 3: Predator assignment
Supplementary material 6 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Table S1
Supplementary material 1 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Appendix 1: Fish inventory
Supplementary material 2 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Appendix 2: Methods
Supplementary material 4 from: Harper L, Watson H, Donnelly R, Hampshire R, Sayer C, Breithaupt T, Hänfling B (2020) Using DNA metabarcoding to investigate diet and niche partitioning in the native European otter (Lutra lutra) and invasive American mink (Neovison vison). Metabarcoding and Metagenomics 4: e56087. https://doi.org/10.3897/mbmg.4.56087
Appendix 4: Samples from non-focal mammal predators
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DANDI Archive for NWB datasets
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OpenNeuro
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