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Mesohabitat use by ...
Mesohabitat use by bullhead (Cottus gobio)
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- Gosselin, Marie-Pierre (författare)
- Karlstads universitet,Institutionen för miljö- och livsvetenskaper (from 2013)
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- Petts, G. E. (författare)
- Univ Westminster, London W1R 8AL, England.
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- Maddock, I. P. (författare)
- Univ Worcester, Inst Sci & Environm, Henwick Grove WR2 6AJ, Worcs, England.
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(creator_code:org_t)
- 2010-07-11
- 2010
- Engelska.
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Ingår i: Hydrobiologia. - : Springer Science and Business Media LLC. - 0018-8158 .- 1573-5117. ; 652:1, s. 299-310
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- Flow variability
- Habitat composition
- Mesohabitat surveys
- Cottus gobio
- Habitat use curves
- Biology
- Biologi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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