Population characteristics of four deep-water pandalid shrimps (Decapoda : Caridea) in the northern Aegean Sea (NE Mediterranean)

• Published in: Journal of Natural History
• Main Authors: Vafidis, D., Leontarakis, P. K., Dailianis, T., Kallianiotis, A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2008
• Subjects: pandalidae; population structure; sex ratio; length-weight relationship; Aegean Sea; PLESIONIKA-MARTIA DECAPODA; EASTERN CENTRAL ATLANTIC; CONTINENTAL-MARGIN; NARVAL CRUSTACEA; CANARY-ISLANDS; DEPTH GRADIENT; LIFE-HISTORY; WESTERN; PATTERNS; BIOLOGY; Biodiversity Conservation; Ecology; narval
• Online Access: http://hdl.handle.net/11615/34208; https://doi.org/10.1080/00222930802254672

The population characteristics of four deep-water pandalid shrimps (Decapoda: Caridea) were studied in the northern Aegean Sea in samples collected annually (1997-2000) in summer, through experimental trawl, at depths down to 600m. Females were larger than males in Plesionika martia and Plesionika heterocarpus; no significant differences in size of males and females were found in Chlorotocus crassicornis and Plesionika antigai. A trend of increasing size with depth was observed, as well as a linear increase in the proportion of females with increasing size. Sex ratio was skewed towards females at all depths in P. antigai, while in P. heterocarpus and C. crassicornis males dominated the intermediate depths. Negative allometries were apparent in the carapace length-weight relationships in males of all species. Isometric relationships were found in females apart from in P. heterocarpus. The population patterns conform to relevant Mediterranean reports. However, some population differences exist that may reflect the distinct environmental conditions prevailing in the study area.