Back to Search
Start Over
Disentangling the complexity of tropical small-scale fisheries dynamics using supervised Self-Organizing Maps
- Source :
- PLoS ONE, PLoS ONE, Vol 13, Iss 5, p e0196991 (2018), PLoS ONE 13 (2018) 5, PLoS ONE, 13(5)
- Publication Year :
- 2018
-
Abstract
- Tropical small-scale fisheries are typical for providing complex multivariate data, due to their diversity in fishing techniques and highly diverse species composition. In this paper we used for the first time a supervised Self-Organizing Map (xyf-SOM), to recognize and understand the internal heterogeneity of a tropical marine small-scale fishery, using as model the fishery fleet of San Pedro port, Tabasco, Mexico. We used multivariate data from commercial logbooks, including the following four factors: fish species (47), gear types (bottom longline, vertical line+shark longline and vertical line), season (cold, warm), and inter-annual variation (2007–2012). The size of the xyf-SOM, a fundamental characteristic to improve its predictive quality, was optimized for the minimum distance between objects and the maximum prediction rate. The xyf-SOM successfully classified individual fishing trips in relation to the four factors included in the model. Prediction percentages were high (80–100%) for bottom longline and vertical line + shark longline, but lower prediction values were obtained for vertical line (51–74%) fishery. A confusion matrix indicated that classification errors occurred within the same fishing gear. Prediction rates were validated by generating confidence interval using bootstrap. The xyf-SOM showed that not all the fishing trips were targeting the most abundant species and the catch rates were not symmetrically distributed around the mean. Also, the species composition is not homogeneous among fishing trips. Despite the complexity of the data, the xyf-SOM proved to be an excellent tool to identify trends in complex scenarios, emphasizing the diverse and complex patterns that characterize tropical small scale-fishery fleets.
- Subjects :
- 0106 biological sciences
Multivariate statistics
lcsh:Medicine
Marine and Aquatic Sciences
01 natural sciences
Vertical bar
Aquaculture and Fisheries
Cluster Analysis
Marine Fish
lcsh:Science
Chondrichthyes
Statistical Data
Multidisciplinary
Animal Behavior
Aquacultuur en Visserij
Fishes
Eukaryota
Agriculture
Tropical marine climate
Osteichthyes
Vertebrates
Physical Sciences
Seasons
Statistics (Mathematics)
Research Article
Self-organizing map
Conservation of Natural Resources
Computer and Information Sciences
Neural Networks
Fishing
Fisheries
Catfish
Marine Biology
010603 evolutionary biology
Life Science
Animals
Mexico
Behavior
010604 marine biology & hydrobiology
lcsh:R
Organisms
Confusion matrix
Biology and Life Sciences
Fishery
Fishing techniques
Fish
Sharks
Earth Sciences
WIAS
Environmental science
lcsh:Q
Scale (map)
Zoology
Mathematics
Maps as Topic
Elasmobranchii
Neuroscience
Subjects
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 13
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- PLoS ONE
- Accession number :
- edsair.doi.dedup.....fef5455accf207377f2e12a572c1fc55
- Full Text :
- https://doi.org/10.1371/journal.pone.0196991