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The effect of tidal cycles on the community structure of plankton (with emphasis on copepods) at AFMED Marina in winter (a preliminary study)

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Tidal cycles had no significant effect on the abundance or community structure of plankton at AFMED (Aquaculture, Fisheries and Marine Environment Department) Marina, nor had any physicochemical factor, except salinity, on the density of copepods (p < 0.05), although variation in the physichochemical data measured was small. The major components of the plankton community throughout the study were copepods, Noctiluca spp. (mostly N. scintillans (Macartney) Kofoid & Swezy), and cirripede nauplii. Their abundance differed between high and low tides throughout the study. Variation between high and low tides was also observed among the various groups and species of copepods. MDPs (Mean Density Percentages) of calanoids, copepod nauplii, and poecilostomatoids were higher at high tide (45%, 20.09%, and 2.81%, respectively), while cyclopoid and harpacticoid MDPs were higher at low tide (30.63% and 9.95%, respectively).

The most dominant copepods were Parvocalanus crassirostris (F. Dahl, 1894), Paracalanus spp., Oithona simplex Farran, 1913, Euterpina acutifrons (Dana, 1847), Oncaea spp., and Corycaeus spp. The copepods with the highest MDPs at high tide were Parvocalanus crassirostris (14.19%), Paracalanus spp. (10.79%), Oncaea spp. (1.75%) and Corycaeus spp. (1.06%), respectively, while Oithona simplex and Euterpina acutifrons had a higher MDP at low tide (14.97% and 9.12%, respectively). The highest MDP at low tide was that of Oithona simplex. Neither tide nor any other factor measured had a significant effect on any of the copepods. Other, related factors (mainly biological and anthropogenic) may thus have accounted for the differences in abundance and biodiversity observed. Weder Tidezyklus noch physikochemische Faktoren hatten einen signifikanten Effekt auf Zahl und Zusammensetzung von Plankton im AFMED (ist die englische Abkürzung für Aqualkultur, Fischerei- und Meeresforschung der Abteilung Umwelt) Hafen, nur Salinität wirkte sich auf die Copepodendichte aus (p < 0,05), die Variationsbreite der gemessenen physikochemischen Daten war dabei insgesamt klein. Es wurde in der Studie festgestellt, dass Copepoden, Noctiluca spp. (hauptsächlich N. scintillans (Macartney) Kofoid & Swezy) und Cirripedier-Nauplien die Hauptbestandteile der Planktongemeinschaft bildeten. Ihre Abundanzen veränderten sich die ganze Studie über zwischen Hoch- und Niedrigwasser. Diese Variabilität zwischen Hoch- und Niedrigwasser wurde auch für andere Copepodengruppen und -arten beobachtet. Der mittlere Dichteanteil von Calanoida, Copepoden-Nauplien und Poecilostomatoiden war höher bei Hochwasser (45%, 20,09% und 2,81%), während er für Cyclopoiden und Harpacticoiden bei Niedrigwasser höher war (30,63% und 9,95%).

Die dominantesten Copepodenarten waren Parvocalanus crassirostris (F. Dahl, 1894), Paracalanus spp., Oithona simplex Farran, 1913, Euterpina acutifrons (Dana, 1847), Oncaea spp. und Corycaeus spp. Die Copepoden mit den höchsten mittleren Dichteanteilen bei Hochwasser waren Parvocalanus crassirostris (14,19%), Paracalanus spp. (10,79%), Oncaea spp. (1,75%) und Corycaeus spp. (1,06%), während Oithona simplex und Euterpina acutifrons höhere mittlere Dichteanteile bei Niedrigwasser zeigten (14,97% und 9,12%). Die Art mit dem höchsten mittleren Dichteanteil bei Niedrigwasser war Oithona simplex. Weder die Tide noch andere Faktoren hatten einen signifikanten Einfluss auf die Copepoden. Auch andere verwandte Parameter (besonders biologische und anthropogene Faktoren) könnten also die beobachtete Unterschiede in Abundanz und Biodiversität erklären.

Affiliations: 1: Aquaculture, Fisheries and Marine Environment Department, Kuwait Institute for Scientific Research, P.O. Box 1638, Salmiya 22017, Kuwait


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