Identification of deep-water pink shrimp abundance distribution patterns and nursery grounds in the eastern Mediterranean by means of generalized additive modelling

Abstract

Generalized Additive Modelling (GAM) techniques were used to model the time series of abundance data of deep-water pink shrimp, collected during the MEDITS bottom trawl surveys carried out in the Greek seas from 1996 to 2006, as functions of the sampling location (longitude-latitude), depth and year. The life stages of the species were taken into account.

Distribution and reproductive pattern of deep-water crangonid shrimps in the East Sea of Korea

“…Environmental factors that change with depth may affect their population dynamics and distributions. Politou et al (2008) confirmed the primordial role that depth plays in the distributions of the different life stages of a deep-water Mediterranean shrimp. In an oligotrophic area, such as the deep-sea environment, where space and food resources are limiting for species with similar morphologies and food habits, segregation by depth could be an adaptation that allows the coexistence of deep-water pandalid shrimps in the western Mediterranean along a depth gradient of 150-11(X) m (Company & Sarda, 1997).…”

Distribution and reproductive aspects of the pandalid shrimp,Pandalus eous,in the deep sea of the East Sea, Korea

“…In addition, food availability and predator density are some of the factors which influence the distribution of species dwelling in deep sea and their life-histories. A size-related distribution was observed for the deep water pink shrimp, with juveniles settling in shallower waters (mostly around 100Á200 m) and larger individuals moving towards deeper waters (Ardizzone et al 1990;Abello et al 2002;Politou et al 2008). These results confirm the primordial role that depth plays in the distribution of the different life stages of deep water shrimp (Politou et al 2008).…”

“…A size-related distribution was observed for the deep water pink shrimp, with juveniles settling in shallower waters (mostly around 100Á200 m) and larger individuals moving towards deeper waters (Ardizzone et al 1990;Abello et al 2002;Politou et al 2008). These results confirm the primordial role that depth plays in the distribution of the different life stages of deep water shrimp (Politou et al 2008). Castilho et al (2008) suggested that the variation in abundance of those species might at times be related to the physiological demands associated with their reproductive behaviour, such as the migration of adults for copulation and spawning.…”

A multi-criteria approach for the dumping of dredged material in the Thermaikos Gulf, Northern Greece

“…According to Kapiris et al (2007), the main trawling ground for this species is restricted to the northern part of the Outer Thermaikos Gulf in water depths up to 70 m. Therefore, the productive area of that prawn does not interfere with the suggested dumping site M18 (located in a water depth of 75 m). In addition, the most important fishing grounds for the deep-water pink shrimp are extended from the middle continental shelf of the Thermaikos Gulf (w100 m) to a depth of 500 m (Politou et al, 2008). Also the juvenile population of that species is distributed in water depths mostly around 100e200 m, while larger individuals move towards deeper waters (Abelló et al, 2000).…”