Computer-Assisted Photo-Identification of Narwhals

ARCTIC ◽  
2011 ◽  
Vol 64 (3) ◽  
Author(s):  
Marie Auger-Méthé ◽  
Marianne Marcoux ◽  
Hal Whitehead
Keyword(s):  
Computer Assisted ◽  
Photo Identification

Computer-assisted photo-identification of individual marine vertebrates: a multi-species system

2003 ◽  
Vol 29 (1) ◽  
pp. 117-123 ◽  
Author(s):  
G. R. Hillman ◽  
B. Würsig ◽  
G. A. Gailey ◽  
N. Kehtarnavaz ◽  
A. Drobyshevsky ◽  
...  
Keyword(s):  
Computer Assisted ◽  
Photo Identification ◽  
Marine Vertebrates

Can ventral pattern be used for individual recognition of the vulnerable Pyrenean brook newt (Calotriton asper)?

2021 ◽  
pp. 99-110
Author(s):  
Manon Dalibard
Keyword(s):  
Individual Recognition ◽  
Rejection Rate ◽  
Poor Quality ◽  
Error Rates ◽  
Acceptance Rate ◽  
Computer Assisted ◽  
Photo Identification ◽  
Passive Integrated Transponders ◽  
Reference Images ◽  
Colour Patterns

Individual recognition of animal species is a prerequisite for capture-mark-recapture (CMR) studies. For amphibians, photoidentification of body pattern is a non-invasive and less expensive alternative than classical marking methods (e.g. passive integrated transponder). However, photo-identification is effective only if the patterns are (i) sufficiently variable between individuals, and (ii) stable over time. This method also depends on the observer’s judgment. In the present study, we assessed the effectiveness of an automatic algorithm (AmphIdent) to recognise ventral colour patterns of the Pyrenean brook newt (Calotrion asper), endemic to the Pyrenees Mountains of France. To assess the performance of the tested method, 113 individuals from two different streams were marked with passive integrated transponders (PIT-tags). We used false rejection rate (FRR), false acceptance rate (FAR) and true acceptance rate (TAR) as metrics to evaluate performances of photoidentification. Mean FRR was 7.3 %, FAR was 5.2 %, and TAR was 92 % across both streams, both sexes and all the observers. FAR was significantly different between sexes, while FRR and TAR were significantly influenced by the interaction between the sex and the stream. Despite these differences, our error rates are among the lowest values found in the literature for both amphibian and non-amphibian computer-assisted photo-identification. We found that poor-quality reference pictures could lead to an increasing difficulty to achieve a correct match when time since first capture rose. Consequently, individual photo-identification using AmphIdent software is a reliable tool to aid in the monitoring the Pyrenean brook newts, provided that pictures are taken with care, reference images are regularly updated and observers are properly trained to use the software and interpret images.

Collaborative photo-identification and monitoring of grey nurse sharks (Carcharias taurus) at key aggregation sites along the eastern coast of Australia

2010 ◽  
Vol 61 (9) ◽  
pp. 971 ◽  
Author(s):  
Sean M. Barker ◽  
Jane E. Williamson
Keyword(s):  
Eastern Coast ◽  
Computer Assisted ◽  
Rigorous Evaluation ◽  
Photo Identification ◽  
South Wales ◽  
Database Research ◽  
Migratory Patterns ◽  
Underwater Camera ◽  
Local Research ◽  
Carcharias Taurus

Before the worldwide decline of the ‘globally vulnerable’ Carcharias taurus may be addressed, an understanding of its migratory patterns and locations, and/or times when sharks may be vulnerable, is required to identify habitats that are critical to its survival. A collaborative framework for photo-identification and monitoring of C. taurus may greatly assist with conservation management initiatives. Images of C. taurus were sourced from public submissions to the www.spotashark.com (verified 12 February 2009) website and during targeted surveys. A computer-assisted program (I3S) was used to match the images of sharks photographically from the database. Research revealed patterns of movement, site utilisation and population structure similar to those in previous tagging studies. With the use of an underwater camera and two laser-scaling devices, 408 individual sharks were identified. Average occupancy times at two locations in New South Wales (NSW), Australia, were 308 days (Fish Rock) and 363 days (Magic Point). Seventeen individuals undertook northward or southward movements, averaging 350 km. The present study showed that a broad-based technique for data acquisition, coupled with rigorous evaluation of photographic identifications can provide support for local research and management programs and may aid with the conservation of the C. taurus species worldwide.

scholarly journals Efficiency of photo identification of inguinal color patterns of Pithecopus gonzagai (Anura: Phyllomedusidae) from northeastern Brazil

2021 ◽  
Vol 20 (1) ◽  
pp. 67-74
Author(s):  
Frede Lima-Araujo ◽  
Ana Carolina Brasileiro ◽  
Elvis Franklin Fernandes Carvalho ◽  
Daniel Cunha Passos
Keyword(s):  
Northeastern Brazil ◽  
Individual Identification ◽  
Computer Assisted ◽  
Color Patterns ◽  
Target Species ◽  
Photo Identification ◽  
Non Invasive ◽  
Matching Efficiency ◽  
Species Specific ◽  
Animal Monitoring

Animal monitoring research involving mark-recapture techniques increasingly requires non-invasive methods of individual identification. The photographic identification method (PIM) is an excellent tool for this purpose and has been applied successfully to many taxa. However, the utility of PIM is a function of species-specific features that are judged suitable for a given target-species. Herein, the suitability of inguinal color patterns for photo identification of individuals of Pithecopus gonzagai are evaluated by comparing two widely used computer-assisted photographic matching programs (I³S and Wild.ID). Both programs accurately identified more than 70% of individuals in the top 20 potential matching photographs. Wild.ID was slightly better than I³S in matching efficiency and has a faster processing time. Thus, PIM is useful to identify individual P. gonzagai; however, before implementing the technique in animal-monitoring studies of other taxa, one must evaluate the suitability PIM for the target species and calibrate the relative efficiency of the software programs in identifying individuals.

scholarly journals Computer-Assisted Photo Identification Outperforms Visible Implant Elastomers in an Endangered Salamander, Eurycea tonkawae

PLoS ONE ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. e59424 ◽  
Author(s):  
Nathan F. Bendik ◽  
Thomas A. Morrison ◽  
Andrew G. Gluesenkamp ◽  
Mark S. Sanders ◽  
Lisa J. O’Donnell
Keyword(s):  
Computer Assisted ◽  
Photo Identification

scholarly journals Photo-identification as a technique for recognition of individual fish: a test with the freshwater armored catfish Rineloricaria aequalicuspis Reis & Cardoso, 2001 (Siluriformes: Loricariidae)

2016 ◽  
Vol 14 (1) ◽  
Author(s):  
Renato B. Dala-Corte ◽  
Júlia B. Moschetta ◽  
Fernando G. Becker
Keyword(s):  
Individual Recognition ◽  
Field Conditions ◽  
Computer Assisted ◽  
Photo Identification ◽  
Naked Eye ◽  
Behavioral Studies ◽  
Feasible Alternative ◽  
Intraspecific Recognition ◽  
Potential Use ◽  
Natural Marks

Abstract Photo-identification allows individual recognition of animal species based on natural marks, being an alternative to other more stressful artificial tagging/marking techniques. An increasing number of studies with different animal groups has shown that photo-identification can successfully be used in several situations, but its feasibility to study freshwater fishes is yet to be explored. We demonstrate the potential use of photo-identification for intraspecific recognition of individuals in the stream-dwelling loricariid Rineloricaria aequalicuspis . We tested photo-identification in laboratory and field conditions based on the interindividual variability in abdominal bony plates. Our test yielded high correct matches in both laboratory (100%) and field conditions (> 97%), comparable to other reliable techniques and to studies that successfully used photo-identification in other animals. In field conditions, the number of correct matches did not differ statistically between computer-assisted and naked-eye identification. However, the average time expended to conclude computer-assisted photo evaluations was about half of the time expended to conclude naked-eye evaluations. This result may be exacerbated when using database with large number of images. Our results indicate that photo-identification can be a feasible alternative technique to study freshwater fish species, allowing for a wider use of mark-recapture in ecological and behavioral studies.

Comparison of Two Computer-Assisted Photo-Identification Methods Applied to Sperm Whales (Physeter macrocephalus)

2005 ◽  
Vol 31 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Bas W. P. M. Beekmans ◽  
Hal Whitehead ◽  
Ruben Huele ◽  
Lisa Steiner ◽  
Adri G. Steenbeek
Keyword(s):  
Computer Assisted ◽  
Physeter Macrocephalus ◽  
Sperm Whales ◽  
Identification Methods ◽  
Photo Identification

3-D organization of fibrinogen receptors using computer reconstruction and whole-mount microscopy

1988 ◽  
Vol 46 ◽  
pp. 30-31
Author(s):  
E. T. O'Toole ◽  
R. R. Hantgan ◽  
J. C. Lewis
Keyword(s):  
Whole Blood ◽  
Colloidal Gold ◽  
Blood Platelets ◽  
Cell Contact ◽  
Computer Assisted ◽  
Adherent Cells ◽  
Differential Centrifugation ◽  
Computer Reconstruction ◽  
Sds Page ◽  
Whole Mount

Thrombocytes (TC), the avian equivalent of blood platelets, support hemostasis by aggregating at sites of injury. Studies in our lab suggested that fibrinogen (fib) is a requisite cofactor for TC aggregation but operates by an undefined mechanism. To study the interaction of fib with TC and to identify fib receptors on cells, fib was purified from pigeon plasma, conjugated to colloidal gold and used both to facilitate aggregation and as a receptor probe. Described is the application of computer assisted reconstruction and stereo whole mount microscopy to visualize the 3-D organization of fib receptors at sites of cell contact in TC aggregates and on adherent cells.Pigeon TC were obtained from citrated whole blood by differential centrifugation, washed with Ca++ free Hank's balanced salts containing 0.3% EDTA (pH 6.5) and resuspended in Ca++ free Hank's. Pigeon fib was isolated by precipitation with PEG-1000 and the purity assessed by SDS-PAGE. Fib was conjugated to 25nm colloidal gold by vortexing and the conjugates used as the ligand to identify fib receptors.

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