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The effect of shore characteristics on Fucus macroalgae on the West coast of Scotland

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Authors
Ahonurmi, Amanda
Date
2019
Discipline
Ekologia ja evoluutiobiologiaEcology and evolutionary biology
Copyright
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.

 
Merien kivikkorantoihin vaikuttavat voimat luovat monipuolisen ja vaihtelevan ympäristön, missä voidaan tutkia suojaisuuden vaikutusta lajien kasvuun ja levinneisyyteen. Vuonna 2011, ennen Fucus spiralis -lajin alalajina pidetty Fucus spiralis var. platycarpus sai lajinimen Fucus guiryi. Laji on myös läheistä sukua lajille F. vesiculosus. Näiden kolmen lajin kokoa ja runsautta ei ole vielä verrattu niiden elinympäristön altistuneisuuteen. Tämän tutkimuksen tavoitteena oli tarkastella kuinka selkeästi nämä kolme lajia eroavat toisistaan Skotlannin länsirannikolla. Toisena tavoitteena oli verrata lajien vyöhykkeitä Skotlannissa eteläisen levinneisyysalueen vyöhykkeisyyteen Portugalissa. Tämän lisäksi tavoitteena oli selvittää kuinka rannan suojaisuus vaikuttaa lajien kokoon ja runsauteen. Suojaisuuden määrittämiseen käytettiin rannan kompassisuuntaa, kaltevuutta ja kasvualustaa. Aineiston keruuta varten käytettiin vuorovesivyöhykkeen yli kulkevia laskentalinjoja. Yksilöiltä mitattiin pituus, ympärysmitta ja varren paksuin kohta. Pituuden ja ympärysmitan avulla laskettiin yksilön tuuheus. Tulokseksi saatiin, että koon ja morfologian perusteella lajit on mahdollista erottaa toisistaan kyseisellä levinneisyysalueella. Eteläisen levinneisyysalueen vyöhykkeisyys on verrattavissa pohjoisemman alueen vyöhykkeisyyteen, vaikka vastaavaa kolmen lajin vyöhykettä ei löytynyt. Koon ja runsauden perusteella F. vesiculosus suosi suojaisempia rantoja, F. guiryi kasvoi samalla lailla suojaisuudesta riippumatta ja F. spiralis menestyi vaihtelevasti kummankinlaisilla rannoilla. ...
 
Rocky shores are fascinating habitats to study due to their varying conditions. Exposure is an important factor determining the geographic distribution and size of many marine algal species. A brown marine macroalgae Fucus spiralis var. platycarpus was given species status as F. guiryi in 2011. Though it was previously thought to have been a subspecies of F. spiralis, it is also similar to F. vesiculosus in morphology. The size and abundance of these three species have not yet been correlated to their environment and especially F. guiryi is not well known. This study aimed to shed light on how we can separate F. spiralis, F. guiryi, and F. vesiculosus along the west coast of Scotland. The second aim was to compare their zonation in the north to the zonation in their more southern range, including Portugal. The third aim was to understand the role that shore shelteredness played in the size and abundance of these species. Aspect (compass direction), slope, and substrate were recorded for eighteen shores. Transects were laid out to span the intertidal zone inhabited by the species, allowing calculation of percentage cover and zonation. Individuals of each species were measured for their length, maximum circumference, and thallus width. The species were so different in size as well as morphology that it was possible to distinguish them. The zonation patterns found in the species’ southern range are reflected in their northern distribution apart from not having a zone with all three species. F. vesiculosus preferred sheltered shores whilst F. guiryi and F. spiralis showed no distinct preference. ...
 
Keywords
abundance Fucus guiryi Fucus spiralis exposure intertidal marine rocky shores shelteredness rannat rakkolevä ekologia levät lajit merilevät levinneisyys vyöhykkeet shores fucus vesiculosus ecology algae types and species seaweeds distribution zones
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http://urn.fi/URN:NBN:fi:jyu-201910144449

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