The Blue Swimming Crab Portunus segnis in the Mediterranean Sea: Invasion Paths, Impacts and Management Measures
Abstract
:Simple Summary
Abstract
1. Introduction
2. Materials and Methods
2.1. Systematic Review of P. segnis Invasion History in Mediterranean Sea
2.2. Distribution, Aggregation Patterns, and Spatial Structure Analyses
- the temporal pattern through the population’s increasing rate over time based on evident slope changes of the cumulative curve of all occurrences;
- the spatio–temporal pattern through cumulative kernel density of occurrences in order to investigate the population’s increasing rate over time and space, and the evolution of aggregation nuclei into persistent areas;
- the aggregation patterns and spatial structure via the spatial pattern at global scale (dispersion vs. random vs. cluster) and at local scale (hot spot, cold spot, clusters and outlier), in order to highlight the change over time, the direction of spread, the dispersion/settlement areas and outliers;
- the key characteristics of distribution (centre of gravity, directional dispersion and directional trends) by tracking changes in shape distribution (dispersed, compact, or elongated) over time and space and comparing the time group of occurrences with each other.
3. Results
3.1. Invasion History and Spatial–Temporal Patterns of P. segnis Distribution in the Mediterranean Sea
3.2. Aggregation Patterns and Spatial Structure
3.3. Key Characteristics of Distribution
4. Discussion
4.1. P. segnis Invasion Pathways
4.2. P. segnis Invasion: Impacts on Biodiversity and Ecosystem Services
4.3. P. segnis Invasion: Management Actions
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Conflicts of Interest
References
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Analysis/Indicator Name | Tools | Spatial Scale | Time Scale | Ecological Meaning |
---|---|---|---|---|
Temporal and Spatial–Temporal Pattern | ||||
Population increase | Cumulative curve of occurrence | Global | All years | Occurrences increasing over time |
Population’s increasing rate | Evaluation of the slopes of the cumulative curve by Least Squares Method | Global | 1886–1923 1924–2001 2002–2021 | The rate of specimens’ increasing in time |
Density hotspots | Kernel density | Global | 1886–1923 1886–1950 1886–1975 1886–2001 1886–2005 1886–2010 1886–2015 1886–2021 | Highest density areas; nuclei of record aggregation; occurrence persistent areas; space–time occurrences density increase. |
Aggregation patterns and spatial structure | ||||
Global Spatial Autocorrelation | Global Moran’s I (GMI) cutoff distance = 250 km | Global | All years | Distribution pattern: dispersion vs. random vs. clustering. Change in the spatial pattern over time |
Statistically significant hot spots and cold spots | Getis—Ord Gi* (GOG*) Hot spot analysis cutoff distance = 250 km | Local | All years | Direction of spread and identification of dispersion/settle areas |
Spatial outliers | Anselin local Moran’s I (AMI) Cluster and outlier analysis search threshold = 250 km | Local | All years | Direction of spread and identification of dispersion/settle areas and outliers |
Key characteristics of distribution | ||||
Centre of gravity | Central tendency (mean centre—median centre) | Global | 1886–1937 1950–1978 1987–2021 | Species concentration centre and its changing over time |
Directional Dispersion | Standard deviational ellipse (1 standard deviation) | Global | 1886–1937 1950–1978 1987–2021 | Species distribution in X and Y directions |
Directional Trends | Standard deviational ellipse (1 standard deviation) | Global | 1886–1937 1950–1978 1987–2021 | Directional trend of species dispersion |
Indicator | Method | Unit | 1886–1937 | 1950–1978 | 1987–2021 |
---|---|---|---|---|---|
Central tendency | Mean centre | Longitude (DD) Latitude (DD) | 32.62 31.98 | 27.46 35.13 | 22.97 34.79 |
Central tendency | Median centre | Longitude (DD) Latitude (DD) | 32.39 31.06 | 31.33 33.58 | 25.75 34.93 |
Directional dispersion | Standard deviational ellipse | XStdDist (km) YStdDist (km) | 219 429 | 366 1405 | 1178 381 |
Directional trends | Standard deviational ellipse | Rotation (°) | 33 | 99 | 86 |
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Castriota, L.; Falautano, M.; Maggio, T.; Perzia, P. The Blue Swimming Crab Portunus segnis in the Mediterranean Sea: Invasion Paths, Impacts and Management Measures. Biology 2022, 11, 1473. https://doi.org/10.3390/biology11101473
Castriota L, Falautano M, Maggio T, Perzia P. The Blue Swimming Crab Portunus segnis in the Mediterranean Sea: Invasion Paths, Impacts and Management Measures. Biology. 2022; 11(10):1473. https://doi.org/10.3390/biology11101473
Chicago/Turabian StyleCastriota, Luca, Manuela Falautano, Teresa Maggio, and Patrizia Perzia. 2022. "The Blue Swimming Crab Portunus segnis in the Mediterranean Sea: Invasion Paths, Impacts and Management Measures" Biology 11, no. 10: 1473. https://doi.org/10.3390/biology11101473
APA StyleCastriota, L., Falautano, M., Maggio, T., & Perzia, P. (2022). The Blue Swimming Crab Portunus segnis in the Mediterranean Sea: Invasion Paths, Impacts and Management Measures. Biology, 11(10), 1473. https://doi.org/10.3390/biology11101473