Marmorvähi (Procambarus virginalis) levik, arvukus ja morfoloogilised näitajad Narvas
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Kuupäev
2020
Kättesaadavus
16.01.2021
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Marmorvähk (Procambarus virginalis), kes on Eestis invasiivne liik, avastati Narva veehoidlast ja kanalitest aastal 2018. Marmorvähk erineb teistest Eesti vähiliikidest kuna noorloomadelt ja täiskasvanud isenditelt ei ole leitud isassuguorganeid ehk tegemist on partenogeense liigiga. Nagu paljud teised invasiivsed vähiliigid kannab ka marmorvähk meie põlisele vähiliigile jõevähk (Astacus astacus) vähikatku. Marmorvähk on tehistingimustest levinud looduslikesse elupaikadesse. Teda märgati Euroopas esimest korda 1990. aastal Saksamaa ja Austria akvakultuuride kaubanduses. Varasemates uuringutes on olnud marmorvähi morfoloogilised suurused väiksemad võrreldes Narvas leiduvate isenditega. Antud magistritöö uurib marmorvähi morfoloogilisi mõõtmeid ning uurib, kas on seost Balti soojuselektri jaamast tuleva sooja vee ja vähkide mõõtmete vahel. Uuringu käigus mõõdeti vähi täispikkus, karapaksi pikkus, karapaksi laius, vähi kaal. Marmorvähki ja tema levikut peab uurima, kuna ta on agressiivselt leviv ja keskkonnatingimuste suhtes tolerantne liik. See töö annab teavet Narvas leiduvate marmorvähkide levikust, arvukusest, ning statistilisi andmeid morfoloogilistest mõõtmetest.
Marbled crayfish (Procambarus virginalis) is an invasive specie in Estonia. This crayfish was discovered from Narva reservior and canal in 2018. Marbled crayfish is different from the other Estonian crayfish species because no male gonads have been found in juveniles and adults. Consequently, marbled crayfish is a parthenogenetic species. Like other invasive crayfish species, marbled crayfish spread crayfish plague to our native crayfish specie Astacus astacus. Marble crayfish have spread from unnatural conditions to natural habitats. It was first noticed in Europe in 1990 in the German and Austrian aquaculture trade. In earlier European studies their morphological sizes measures of marbled crayfish are smaller compared to Narva populations. This study examines the morphological dimensions of marbled crayfish and investigates whether there is a connection between the warm water originating from the Baltic power plant and the abundance and dimensions of crayfish. The study measured marbled crayfish total length, carapace length, carapace width, weight. Marbled crayfish distribution should be studied because it is an aggressively spreading species and tolerant to environmental conditions. This work provides information on the prevalence and abundance of marble crayfish in Narva, and statistics on morphological dimensions.
Marbled crayfish (Procambarus virginalis) is an invasive specie in Estonia. This crayfish was discovered from Narva reservior and canal in 2018. Marbled crayfish is different from the other Estonian crayfish species because no male gonads have been found in juveniles and adults. Consequently, marbled crayfish is a parthenogenetic species. Like other invasive crayfish species, marbled crayfish spread crayfish plague to our native crayfish specie Astacus astacus. Marble crayfish have spread from unnatural conditions to natural habitats. It was first noticed in Europe in 1990 in the German and Austrian aquaculture trade. In earlier European studies their morphological sizes measures of marbled crayfish are smaller compared to Narva populations. This study examines the morphological dimensions of marbled crayfish and investigates whether there is a connection between the warm water originating from the Baltic power plant and the abundance and dimensions of crayfish. The study measured marbled crayfish total length, carapace length, carapace width, weight. Marbled crayfish distribution should be studied because it is an aggressively spreading species and tolerant to environmental conditions. This work provides information on the prevalence and abundance of marble crayfish in Narva, and statistics on morphological dimensions.
Kirjeldus
Magistritöö
Vee ja maismaa ökosüsteemide rakendusbioloogia õppekaval
Märksõnad
magistritööd, Procambarus virginalis, võõrliigid, partenogenees