Spatio-temporal distribution and population dynamics of two sympatric species: The rock shrimps Sicyonia dorsalis Kingsley, 1878 and Sicyonia typica (Boeck, 1864) (Penaeoidea: Sicyoniidae) on the coast of Ilhéus, Bahia, northeastern Brazil
Tavares, R.G.; Paschoal, L.R.P.; Guimarães, F.J.; Brandão, S.N.; da Conceição Guerreiro Couto, E. (2025). Spatio-temporal distribution and population dynamics of two sympatric species: The rock shrimps Sicyonia dorsalis Kingsley, 1878 and Sicyonia typica (Boeck, 1864) (Penaeoidea: Sicyoniidae) on the coast of Ilhéus, Bahia, northeastern Brazil. Arthropoda 3(1): 1. https://dx.doi.org/10.3390/arthropoda3010001
In: Arthropoda. MDPI AG: Switzerland. e-ISSN 2813-3323, more
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| Keywords |
ASW, Brazil, Bahia
Environmental factors
Population characteristics > Population structure > Sex ratio
Sicyonia dorsalis Kingsley, 1878 [WoRMS]; Sicyonia typica (Boeck, 1864) [WoRMS]
Bahia [Marine Regions]
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| Author keywords |
Almada River; bycatch; shrimp trawling; southern Bahia |
| Authors | | Top |
- Tavares, R.G.
- Paschoal, L.R.P.
- Guimarães, F.J.
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- Brandão, S.N., more
- da Conceição Guerreiro Couto, E.
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| Abstract |
Rock shrimps (Sicyonia dorsalis and Sicyonia typica) are commonly caught as bycatch during shrimp trawling along the Brazilian coast, but are not commercially exploited due to their small size and hard carapace. This study evaluated their spatio-temporal distribution, size classes, and sex ratio near the Almada River Estuary, Ilhéus, Bahia, Northeastern Brazil, and tested correlations between environmental factors and species abundance. Samples were collected monthly using double-rig trawl nets in the estuary and along transects at depths of 5–35 m. Bottom water and sediment samples were obtained for analyses of environmental factors. In total, 5336 individuals of S. dorsalis and 303 individuals of S. typica were collected. No individuals were recorded in the estuary. Both species were significantly more abundant between 25 and 35 m, where fine sediment with high levels of organic matter occurred. Considering the temporal variation, their abundance decreased during the rainy season, coinciding with increased river flow. Organic matter content, salinity, and water transparency were the primary environmental factors influencing abundance. Females were generally larger and predominant compared to males, likely due to life cycle dynamics. Despite being congeneric and sympatric, the species exhibited distinct population patterns, possibly to avoid niche overlap and competition. |
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