Introduction to Intelligent Decision Support and Big Data for Logistics and Supply Chain Management Minitrack

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Protozoans as a food source for Antarctic krill, Euphausia superba: complementary insights from stomach content, fatty acids, and stable isotopes

We studied the diet of Antarctic krill, Euphausia superba, at five stations across the southwest Atlantic sector in summer 2003 by analyzing stomach content, fatty acids, and stable isotopes on the same individuals. Our aim was to examine what each method could contribute to our understanding of krill nutrition and whether differences seen in growth rates were linked to their food. All three methods indicated clear regional differences in diet, but small ontogenetic and sex-related differences. Overall, diatoms were the most abundant item in the stomach, but at three of the stations, tintinnids, large dinoflagellates, and other armored flagellates dominated the identifiable biomass. Copepod remains were rare. Fatty acids profiles gave additional information about feeding on weakly silicified diatoms and athecate heterotrophic dinoflagellates, with the latter being the main food source at one of the stations. Two independent indices of carnivory, d15N and the fatty acid ratio 18:1(n-9)/18:1(n-7), were correlated among krill from the same swarm, suggesting consistent differences in diet between individuals. An internal index of trophic position, (i.e., d15Nglutamic acid-d15Nphenylalanine) underlined the importance of heterotrophic food for the nutrition of krill, even in summer. Highest growth rates of krill were found during a diatom bloom and coincided with a mixed diet, large digestive gland, and fast stomach passage. However, even in a nonbloom, flagellate-dominated system, krill were able to sustain medium growth rates when feeding on heterotrophic dinoflagellates. Each method supplied specific information on krill nutrition, and the true picture is only revealed when the various methods are used together

Sachs triangulations and regular maps

AbstractA Sachs triangulation of a closed surface S is a triangulation T admitting a vertex-labelling λ in a group G subject to the following conditions: (S1) For any facial triangle t of T with vertices x, y and z, either λ(x)λ(y)λ(z) = 1 or λ(x)λ(z)λ(y) = 1. (S2) For any g,hϵG, there exists at most one edge in T whose endpoints are labelled g and h.In this paper we establish various sufficient conditions for a Sachs triangulation to be a regular (symmetrical) map. As an application of these results we construct, for each integer d ⩾ 2, a 2d-valent reflexible symmetrical triangulation of genus 1 + d(d - 3)/2