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Increasing Accuracy: A New Design and Algorithm for Automatically Measuring Weights, Travel Direction and Radio Frequency Identification (RFID) of Penguins.

Afanasyev V, Buldyrev SV, Dunn MJ, Robst J, Preston M, Bremner SF, Briggs DR, Brown R, Adlard S, Peat HJ - PLoS ONE (2015)

Bottom Line: Reliable discrimination between single and multiple penguin crossings is demonstrated.Users are able to define required levels of accuracy by adjusting filters and raw data are automatically recorded and stored allowing for a range of processing options.This paper presents the underlying principles, design specification and system description, provides evidence of the weighbridge's accurate performance and demonstrates how its design is a significant improvement on existing systems.

View Article: PubMed Central - PubMed

Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB30ET, United Kingdom.

ABSTRACT
A fully automated weighbridge using a new algorithm and mechanics integrated with a Radio Frequency Identification System is described. It is currently in use collecting data on Macaroni penguins (Eudyptes chrysolophus) at Bird Island, South Georgia. The technology allows researchers to collect very large, highly accurate datasets of both penguin weight and direction of their travel into or out of a breeding colony, providing important contributory information to help understand penguin breeding success, reproductive output and availability of prey. Reliable discrimination between single and multiple penguin crossings is demonstrated. Passive radio frequency tags implanted into penguins allow researchers to match weight and trip direction to individual birds. Low unit and operation costs, low maintenance needs, simple operator requirements and accurate time stamping of every record are all important features of this type of weighbridge, as is its proven ability to operate 24 hours a day throughout a breeding season, regardless of temperature or weather conditions. Users are able to define required levels of accuracy by adjusting filters and raw data are automatically recorded and stored allowing for a range of processing options. This paper presents the underlying principles, design specification and system description, provides evidence of the weighbridge's accurate performance and demonstrates how its design is a significant improvement on existing systems.

No MeSH data available.


Related in: MedlinePlus

Penguin crossing graphs.Graphs showing both the outward morning crossing and the inward evening crossing of the same penguin when chick rearing.
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pone.0126292.g006: Penguin crossing graphs.Graphs showing both the outward morning crossing and the inward evening crossing of the same penguin when chick rearing.

Mentions: An ideal record for a single bird crossing the weighbridge will consist of a long duration when the penguin is on the bridge followed by a short period when the bridge is empty. Two typical single bird crossing files showing a known penguin leaving the colony in the morning and returning in the evening are shown in Fig 6. When two ideal crossings exist for the same bird on the same day during the chick rearing period, it is possible to calculate both trip length and meal size. The greater the time period between the two selected moments of time, the greater confidence can be placed in the calculated weight values. It is possible to select which weight values to use in any analyses depending on the length of time used for the weight calculation—for example during the 2011–2012 breeding season, weights were calculated for 58888 bridge crossings, with 76% having weights calculated from at least 1 s on the bridge, 54% from 1.5 s, 32% from 2 s and 19% from 2.5 s. Some records are less than ideal and files can contain more than one penguin which may be on the bridge simultaneously or one may enter when the first one has left; two examples are shown in Fig 7.


Increasing Accuracy: A New Design and Algorithm for Automatically Measuring Weights, Travel Direction and Radio Frequency Identification (RFID) of Penguins.

Afanasyev V, Buldyrev SV, Dunn MJ, Robst J, Preston M, Bremner SF, Briggs DR, Brown R, Adlard S, Peat HJ - PLoS ONE (2015)

Penguin crossing graphs.Graphs showing both the outward morning crossing and the inward evening crossing of the same penguin when chick rearing.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4404094&req=5

pone.0126292.g006: Penguin crossing graphs.Graphs showing both the outward morning crossing and the inward evening crossing of the same penguin when chick rearing.
Mentions: An ideal record for a single bird crossing the weighbridge will consist of a long duration when the penguin is on the bridge followed by a short period when the bridge is empty. Two typical single bird crossing files showing a known penguin leaving the colony in the morning and returning in the evening are shown in Fig 6. When two ideal crossings exist for the same bird on the same day during the chick rearing period, it is possible to calculate both trip length and meal size. The greater the time period between the two selected moments of time, the greater confidence can be placed in the calculated weight values. It is possible to select which weight values to use in any analyses depending on the length of time used for the weight calculation—for example during the 2011–2012 breeding season, weights were calculated for 58888 bridge crossings, with 76% having weights calculated from at least 1 s on the bridge, 54% from 1.5 s, 32% from 2 s and 19% from 2.5 s. Some records are less than ideal and files can contain more than one penguin which may be on the bridge simultaneously or one may enter when the first one has left; two examples are shown in Fig 7.

Bottom Line: Reliable discrimination between single and multiple penguin crossings is demonstrated.Users are able to define required levels of accuracy by adjusting filters and raw data are automatically recorded and stored allowing for a range of processing options.This paper presents the underlying principles, design specification and system description, provides evidence of the weighbridge's accurate performance and demonstrates how its design is a significant improvement on existing systems.

View Article: PubMed Central - PubMed

Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB30ET, United Kingdom.

ABSTRACT
A fully automated weighbridge using a new algorithm and mechanics integrated with a Radio Frequency Identification System is described. It is currently in use collecting data on Macaroni penguins (Eudyptes chrysolophus) at Bird Island, South Georgia. The technology allows researchers to collect very large, highly accurate datasets of both penguin weight and direction of their travel into or out of a breeding colony, providing important contributory information to help understand penguin breeding success, reproductive output and availability of prey. Reliable discrimination between single and multiple penguin crossings is demonstrated. Passive radio frequency tags implanted into penguins allow researchers to match weight and trip direction to individual birds. Low unit and operation costs, low maintenance needs, simple operator requirements and accurate time stamping of every record are all important features of this type of weighbridge, as is its proven ability to operate 24 hours a day throughout a breeding season, regardless of temperature or weather conditions. Users are able to define required levels of accuracy by adjusting filters and raw data are automatically recorded and stored allowing for a range of processing options. This paper presents the underlying principles, design specification and system description, provides evidence of the weighbridge's accurate performance and demonstrates how its design is a significant improvement on existing systems.

No MeSH data available.


Related in: MedlinePlus