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1. Seasonal variation in the diet of Cape clawless otters (Aonyx capensis) in a marine habitat

Author:
M.J. Somers
Source:
African zoology 2000 v.35 no.2 pp. 261-268
ISSN:
2224-073X
Subject:
Aonyx capensis; Clinus; Jasus; Octopodidae; Potamonautes perlatus; autumn; crabs; diet; fish; frogs; habitats; lobsters; mammals; prey species; seasonal variation; spring; summer; winter; South Africa
Abstract:
... Seasonal changes in the diet of Cape clawless otters Aonyx capensis feeding in the surf zone in False Bay, Western Cape Province, South Africa, were investigated by spraint (faecal) analysis. The most common prey species, during all seasons, was the Cape rock crab, Plagusia chabrus. The next most important prey species was the Cape rock lobster, Jasus lalandii, with the fish species Clinus superci ...
DOI:
10.1080/15627020.2000.11657097

2. Diets of Cape clawless otters at two South African coastal localities

Author:
W. Emmerson; S. Philip
Source:
African zoology 2004 v.39 no.2 pp. 201-210
ISSN:
2224-073X
Subject:
Aonyx capensis; Panulirus homarus; analysis of covariance; analysis of variance; coasts; conservation areas; crabs; diet; fish; lobsters; molluscs; prey species; South Africa
Abstract:
... The diet of the Cape clawless otter Aonyx capensis was investigated at the Dwessa Nature Re serve and Mkambati Nature Reserve on the Wild Coast, Eastern Cape Province, South Africa. Their diet was more varied at Mkambati (15 prey species) than Dwessa (7 species). In terms of percentage relative frequency of occurrence, the spiny lobster Panulirus homarus was found to be the most common prey item a ...
DOI:
10.1080/15627020.2004.11657217

3. The Congo clawless otter (Aonyx congicus) Mustelidae: Lutrinae): a review of its systematics, distribution and conservation status

Author:
Hélène Jacques; Géraldine Veron; Franck Alary; Stéphane Aulagnier
Source:
African zoology 2009 v.44 no.2 pp. 159-170
ISSN:
2224-073X
Subject:
Aonyx capensis; conservation status; deforestation; information networks; meat; museums; rain forests; surveys; Angola; Burundi; Cameroon; Central African Republic; Democratic Republic of the Congo; Gabon; Republic of the Congo; Rwanda; Uganda
Abstract:
... Among the four African otter species, the Congo clawless otter (Aonyx congicus) is the least known due to the remoteness of its Central African equatorial rainforest range. The taxonomic status and the criteria to differentiate A. congicus from the quite similar Cape clawless otter (Aonyx capensis) are reviewed. The current distribution and status of A. congicus (Gabon, Congo, Democratic Republic ...
DOI:
10.1080/15627020.2009.11407450

4. An Assessment of Spatial and Temporal Variation in the Diet of Cape Clawless Otters (Aonyx capensis) in Marine Environments

Author:
Rowan K. Jordaan; Trevor McIntyre; Michael J. Somers; Marthán N. Bester
Source:
South African journal of wildlife research 2015 v.45 no.3 pp. 342-353
ISSN:
0379-4369
Subject:
Aonyx capensis; biomass; coasts; conservation areas; diet; fish; lobsters; monitoring; national parks; shorelines; species diversity; summer; temporal variation; wildlife; South Africa
Abstract:
... We studied the diet of Cape clawless otters (Aonyx capensis) at three sites along the eastern and southern coast of South Africa to assess possible spatial variation along a community species richness and biomass gradient associated with rocky shores. A total of 309 spraints representing two seasons (summer 2013/2014 and winter 2014) were collected and subsequently analysed. The percentage occurre ...
DOI:
10.3957/056.045.0342

5. Differentiation of two South African otter species (Aonyx capensis and Lutra maculicollis) from spraint based on partial CytB primer sets

Author:
M. Thabang Madisha; Damian Ponsonby; Ute Schwaibold; Antoinette Kotzé; Raymond Jansen; Helene Brettschneider; Desiré L. Dalton
Source:
Global ecology and conservation 2015 v.4 pp. 8-13
ISSN:
2351-9894
Subject:
Aonyx capensis; DNA; DNA barcoding; DNA primers; Lutra; animals; ecology; feces; species identification
Abstract:
... Accurate species identification based on visual cues can be challenging due to morphological similarities and the cryptic nature of certain species. Thus a more conclusive method of identification is required, namely DNA barcoding. This is the case regarding two South African otter species, Cape Clawless otter (Aonyx capensis) and the spotted necked otter (Lutra maculicollis). Due to the cryptic n ...
DOI:
10.1016/j.gecco.2015.05.001

6. Tibial plateau leveling osteotomy in a cape clawless otter (aonyx capensis) with cranial cruciate ligament ruptures

Author:
Molter Christine M.; Jackson Joshua; Clippinger Tracy L.; Sutherland-Smith Meg
Source:
Journal of zoo and wildlife medicine 2015 v.46 no.1 pp. 179-183
ISSN:
1042-7260
Subject:
Aonyx capensis; clinical examination; cranial cruciate ligament; exercise; females; lameness; osteotomy; radiography
Abstract:
... A 13-yr-old female Cape clawless otter (Aonyx capensis) presented with an acute mild right pelvic limb lameness that progressed to a non–weight-bearing lameness. Diagnosis of a ruptured cranial cruciate ligament (CCL) was made based on positive cranial drawer during physical examination and was supported by radiographs. A surgical repair with a tibial plateau leveling osteotomy (TPLO) and bone anc ...
DOI:
10.1638/2014-0162R1.1

7. Otter occupancy in the Cape Peninsula: Estimating the probability of river habitat use by Cape clawless otters, Aonyx capensis, across a gradient of human influence

Author:
Nicola C. Okes; M. Justin O'Riain
Source:
Aquatic conservation 2017 v.27 no.3 pp. 706-716
ISSN:
1052-7613
Subject:
Aonyx capensis; anthropogenic activities; breeding sites; cost effectiveness; estuaries; freshwater; freshwater ecosystems; habitat preferences; habitats; humans; landscapes; marine protected areas; models; monitoring; probability; rivers; surveys; urban areas; urban development; wetlands; South Africa
Abstract:
... The distribution of Cape clawless otters, Aonyx capensis, in South Africa and their habitat requirements in freshwater and marine systems has been well established. There is, however, a lack of information on how otters are adapting to urban development and the transformation of critical freshwater habitat. Within the Western Cape, the Cape Peninsula exhibits substantial variation in levels of hum ...
DOI:
10.1002/aqc.2738

8. More than range exposure: Global otter vulnerability to climate change

Author:
C. Cianfrani; O. Broennimann; A. Loy; A. Guisan
Source:
Biological conservation 2018 v.221 pp. 103-113
ISSN:
0006-3207
Subject:
Aonyx capensis; Lontra longicaudis; Lontra provocax; Lutra; Pteronura brasiliensis; climate change; conservation areas; freshwater; habitat destruction; habitats; humans; predators; prediction; temperature
Abstract:
... Climate change impact on species is commonly assessed by predicting species' range change, a measure of a species' extrinsic exposure. However, this is only one dimension of species' vulnerability to climate change. Spatial arrangement of suitable habitats (e.g., fragmentation), their degree of protection or human disturbance, as well as species' intrinsic sensitivity, such as climatic tolerances, ...
DOI:
10.1016/j.biocon.2018.02.031

9. A mass mortality of fishes caused by receding water levels in the vegetated littoral zone of the West Kleinemonde Estuary, South Africa

Author:
AK Whitfield; PD Cowley
Source:
African journal of aquatic science 2018 v.43 no.2 pp. 179-186
ISSN:
1727-9364
Subject:
Aonyx capensis; Bivalvia; Isopoda; Ruppia; algae; birds; estuaries; fish; fish kills; food availability; foraging; littoral zone; macrophytes; piscivores; rivers; trapping; vegetation; watersheds; South Africa
Abstract:
... On 15 November 2017 the mouth of the West Kleinemonde Estuary breached following heavy catchment rains and increased river flow. The water level in the estuary following mouth opening decreased by 1.65 m within 24 h, resulting in an almost complete draining of the littoral zone where large beds of the aquatic macrophyte Ruppia cirrhosa and mats of the associated filamentous algae were present. As ...
DOI:
10.2989/16085914.2018.1466685

10. Can opportunistic citizen sightings assist in the monitoring of an elusive, crepuscular mammal in an urban environment?

Author:
Nicola C. Okes; M. Justin O’Riain
Source:
Urban ecosystems 2019 v.22 no.3 pp. 483-492
ISSN:
1083-8155
Subject:
Aonyx capensis; crime; data collection; ecosystems; habitats; mammals; models; monitoring; rivers; surveys; urban areas; wildlife; wildlife management
Abstract:
... Central to appropriate wildlife management is an effective monitoring program. Monitoring wildlife in urban environments offers unique challenges in the form of barriers, prohibited access and crime. It also, however, provides a unique opportunity to enlist residential communities in collecting data on distribution of a number of species. Opportunistic sightings data has its flaws, including the l ...
DOI:
10.1007/s11252-019-0829-3

11. Limited Animal-Facilitated Nutrient Transfer across an Aquatic–Terrestrial Interface in a Southern African Savanna

Author:
Shannon R. Conradie; Grant Hall; Michael J. Somers; Trevor McIntyre
Source:
South African journal of wildlife research 2019 v.49 no.1 pp. 0052
ISSN:
0379-4369
Subject:
Aonyx capensis; ammonia; carbon; defecation; direct contact; feces; freshwater; mineralization; nitrogen; nutrient availability; research; riparian areas; rivers; savannas; scent marking behavior; subsurface soil layers; urination; volatilization; wildlife
Abstract:
... Animal-mediated nutrient transfer facilitates nutrient cycling in marine, freshwater and terrestrial ecosystems via the deposition of aquatically-derived nutrients such as nitrogen (N) and carbon (C). This mode of nutrient transfer has not been studied in southern African river systems. We investigated nutrient deposition associated with defecation, urination, and scent-marking at latrine sites of ...
DOI:
10.3957/056.049.0052

12. Plasticity and specialisation in the isotopic niche of African clawless otters foraging in marine and freshwater habitats

Author:
Rowan K. Jordaan; Michael J. Somers; Grant Hall; Trevor McIntyre
Source:
Mammalian biology 2019 v.98 pp. 61-72
ISSN:
1616-5047
Subject:
Aonyx capensis; anthropogenic activities; diet; environmental factors; foraging; freshwater; habitats; isotope labeling; molluscs; sharks; stable isotopes; trout
Abstract:
... Individual-level behavioural plasticity resulting from differences in environmental conditions is prevalent in many organisms and may result in phenomena such as dietary- or habitat specialisation. The isotopic niche of African clawless otters, Aonyx capensis, occupying different habitats was investigated with the use of stable isotope techniques. Stable isotope analyses revealed that African claw ...
DOI:
10.1016/j.mambio.2019.07.006

13. Widespread anticoagulant poison exposure in predators in a rapidly growing South African city

Author:
Laurel E.K. Serieys; Jacqueline Bishop; Nicola Okes; Joleen Broadfield; Deborah Jean Winterton; Robert H. Poppenga; Storme Viljoen; Robert K. Wayne; M. Justin O'Riain
Source:
Science of the total environment 2019 v.666 pp. 581-590
ISSN:
0048-9697
Subject:
Aonyx capensis; Bubo; Caracal caracal; Genetta tigrina; Herpestidae; Mellivora capensis; anticoagulants; bioaccumulation; biodiversity; blood; forage; habitat destruction; invertebrates; issues and policy; linear models; liver; predators; risk factors; rodenticides; toxicity; trophic levels; vines; vineyards; wildlife; wildlife habitats; South Africa
Abstract:
... Anticoagulant rodenticides (ARs) are used worldwide to control rodent populations. ARs bioaccumulate across trophic levels and threaten non-target wildlife. We investigated the prevalence of AR exposure in seven predator species in the rapidly developing Greater Cape Town region of South Africa – a mosaic of natural, urban, and agricultural areas within a global biodiversity hotspot. We focused sa ...
DOI:
10.1016/j.scitotenv.2019.02.122

14. The diet of spotted-necked otters foraging in trout-stocked waters in Mpumalanga, South Africa

Author:
Rowan K Jordaan; Michael J Somers; Grant Hall; Trevor McIntyre
Source:
African zoology 2020 v.55 no.2 pp. 141-148
ISSN:
2224-073X
Subject:
Aonyx capensis; crabs; diet; farmed fish; feeding preferences; foraging; freshwater fisheries; frogs; habitats; human-wildlife relations; isotope labeling; stable isotopes; temporal variation; trout; urbanization; South Africa
Abstract:
... Human-wildlife conflict is likely to increase as urbanisation increases. African clawless otters, Aonyx capensis, and spotted-necked otters, Hydrictis maculicollis, are illegally persecuted for their perceived role in reducing trout in artificially stocked habitats in South Africa. The diet of African clawless otters has been investigated, but little is known about the diet of spotted-necked otter ...
DOI:
10.1080/15627020.2020.1741447

15. The Determinants of Mesocarnivore Activity Patterns in Highveld Grassland and Riparian Habitats

Author:
Andrea B. Webster; Mariëtte E. Pretorius; Michael J. Somers
Source:
African journal of wildlife research 2021 v.51 no.1 pp. 0178
ISSN:
2410-7220
Subject:
Aonyx capensis; Canis mesomelas; Cynictis penicillata; Genetta; Leptailurus serval; cameras; carnivores; conservation areas; grasslands; marshes; research; sympatry; temperature; wildlife; South Africa
Abstract:
... Despite the diversity of mesocarnivores and the broad geographic ranges of these species, our understanding of their behaviour and ecology at multi-species and community levels is limited. Our study was conducted between April and mid-July 2015 and used data collected over 105 days from 39 camera traps to quantify activity patterns of sympatric mesocarnivores in riparian and grassland habitats of ...
DOI:
10.3957/056.051.0178

16. Increased population density and behavioural flexibility of African clawless otters (Aonyx capensis) in specific anthropogenic environments

Author:
Tshepiso L Majelantle; Andre Ganswindt; Rowan K Jordaan; David J Slip; Robert Harcourt; Trevor McIntyre
Source:
Urban ecosystems 2021 v.24 no.4 pp. 691-699
ISSN:
1083-8155
Subject:
Aonyx capensis; animal adaptation; anthropogenic activities; cameras; conservation areas; farms; group size; land use change; population density; population growth; South Africa
Abstract:
... Land transformation for anthropogenic use is the leading cause of species decline globally. However, few species are able to succeed in anthropogenically disturbed environments. African clawless otters (Aonyx capensis) occur in a wide variety of habitats, and thus are good model species to investigate animal adaptation to anthropogenic environments. Therefore, we aimed to estimate and compare popu ...
DOI:
10.1007/s11252-020-01068-1

17. Stakeholders’ perceptions of mammal occurrence and abundance on agricultural properties bordering the Boland Mountain Complex, South Africa

Author:
Willem A Nieman; Brittany C Schultz; Anita Wilkinson; Alison J Leslie
Source:
African zoology 2021 v.56 no.2 pp. 104-116
ISSN:
2224-073X
Subject:
Aonyx capensis; Mellivora capensis; Panthera pardus; Proteles cristata; Sus scrofa; dogs; environmental knowledge; introduced species; rabbits; stakeholders; swine; wildlife; zoology; South Africa
Abstract:
... The encroachment of agricultural landscapes on natural ecosystems poses a significant threat to native wildlife persistence. In the Boland Mountain Complex (BMC), the presence of mammals was well documented in the 20th century, but an updated account is lacking. This study relied on Local Ecological Knowledge (LEK) to elucidate perceived medium- to large-sized (>300 g) mammal occurrences, distribu ...
DOI:
10.1080/15627020.2021.1885990

18. The diving behavior of African clawless and spotted-necked otters in freshwater environments

Author:
Rowan K. Jordaan; Michael J. Somers; Trevor McIntyre
Source:
Journal of mammalogy 2021 v.102 no.4 pp. 1020-1029
ISSN:
0022-2372
Subject:
Aonyx capensis; Oncorhynchus mykiss; diet; energy; freshwater; habitats; mammalogy; South Africa
Abstract:
... Understanding the diving behavior of semiaquatic mammals, particularly in relation to estimated aerobic dive limits and diet, is important to understand their adaptability and potential vulnerability to changes in prey type and distribution. The diving behavior of African clawless otters, Aonyx capensis, and spotted-necked otters, Hydrictis maculicollis, is poorly known, and no estimates of their ...
DOI:
10.1093/jmammal/gyab031