Počet záznamů: 1
Vertical distribution of alewife in the Lake Ontario offshore: Implications for resource use
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SYSNO ASEP 0480484 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Vertical distribution of alewife in the Lake Ontario offshore: Implications for resource use Tvůrce(i) Říha, Milan (BC-A) RID, ORCID
Walsh, M. G. (US)
Connerton, M. J. (US)
Holden, J. (CA)
Weidel, B. C. (US)
Sullivan, P. J. (US)
Holda, T. J. (US)
Rudstam, L. G. (US)Celkový počet autorů 8 Zdroj.dok. Journal of Great Lakes Research. - : Elsevier - ISSN 0380-1330
Roč. 43, č. 5 (2017), s. 823-837Poč.str. 15 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova diel vertical migration ; deep chlorophyll layer ; zooplankton ; mysids ; alewife Vědní obor RIV DA - Hydrologie a limnologie Obor OECD Marine biology, freshwater biology, limnology CEP LD15021 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora BC-A - RVO:60077344 UT WOS 000411533900006 EID SCOPUS 85027156718 DOI 10.1016/j.jglr.2017.07.007 Anotace Oligotrophication of Lake Ontario has led to increased water clarity and an increased proportion of zooplankton residing in the metalimnion during the day, which may affect the utilization of different depth regions for planktivorous fish. We investigated day and night distributions of fish using hydroacoustics and suspended vertical gillnets during the summer of 2013 when a deep chlorophyll layer (DCL) was established. We related fish distributions to concurrent measures of temperature and prey (zooplankton) density. Alewife dominated in vertical gill net catches, indicating that most acoustic targets were alewife. Alewife schooled during the day in the bottom of the mixed layer, and at dusk alewife schools broke up and fish moved towards the surface. We hypothesize this movement followed migrating zooplankton to allow feeding at night, alewife sampled from vertical gillnets fed on cyclopoid copepods and cladocerans, prey groups that migrate into the epilimnion at night. Some alewife remained at the bottom of the mixed layer at night and these fish ate deep-water calanoid copepods such as Limnocalanus. Vertical distributions were best predicted by temperature and the interaction between temperature and zooplankton density. We include uplooking acoustics data to complement our downlooking datasets, which provided evidence for potential bias in downlooking acoustic assessments of alewife due to high proportions of alewife found in the surface exclusion zone. Our approach combining several datasets provides a new perspective to understand summer diel distribution of alewife and the factors driving their distribution. Pracoviště Biologické centrum (od r. 2006) Kontakt Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Rok sběru 2018
Počet záznamů: 1