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Mesohabitat use by ...
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Gosselin, Marie-PierreKarlstads universitet,Institutionen för miljö- och livsvetenskaper (from 2013)
(författare)
Mesohabitat use by bullhead (Cottus gobio)
- Artikel/kapitelEngelska2010
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2010-07-11
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Springer Science and Business Media LLC,2010
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kau-40487
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https://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-40487URI
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https://doi.org/10.1007/s10750-010-0363-zDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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Habitat composition and connectivity within a stream vary with changing flows but the influence of changing flow on habitat use by fish is not well understood. Meso- and microhabitat surveys were used to investigate habitat use by bullhead (Cottus gobio Linnaeus) in response to discharge variation in a small tributary of the Upper Severn, England. Mesohabitat mapping surveys were carried out over a range of summer flows (0.016-0.216 m(3) s(-1)) and were coupled with direct underwater observations (snorkelling) of fish location. Five mesohabitat types-glides, runs, riffles, chutes and pools-were present in the reach at all flows surveyed and 'backwaters' were found at three flows. The macro-morphology of the reach comprised six riffle-pool sequences divided into 27 mesohabitats with the maximum diversity (23 mesohabitats) at intermediate flows (Q (43)) and only 15 mesohabitats at Q (95). Despite low numbers of fish (N = 78), bullhead displayed a strong association (51% of the fish) with glides-relatively deep habitats having high rates of velocity increase with flow. However, 54% of the fish were observed in two large, persistent mesohabitats, a glide (34%) and a pool (20%), both located below a faster flowing mesohabitat. Habitat use curves based upon micro-habitat data showed bullhead favoured low velocities (< 0.30 m s(-1)), depths less than 0.30 m and a cobble substratum. This study illustrates the value of cross-scale investigations in linking fish ecology, flow and physical habitat variability and suggests mesohabitat size, persistence and arrangement may influence fish distribution.
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Petts, G. E.Univ Westminster, London W1R 8AL, England.
(författare)
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Maddock, I. P.Univ Worcester, Inst Sci & Environm, Henwick Grove WR2 6AJ, Worcs, England.
(författare)
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Karlstads universitetInstitutionen för miljö- och livsvetenskaper (from 2013)
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Hydrobiologia: Springer Science and Business Media LLC652:1, s. 299-3100018-81581573-5117
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