NDLI: Acid–base status mediates the selection of organic habitats by upland stream invertebrates

Content Provider	Springer Nature Link
Author	Johnston, Sarah R. Vaughan, Ian P. Ormerod, S. J.
Copyright Year	2014
Abstract	Freshwater bryophytes support large numbers of invertebrates, but their importance compared to other organic habitats, e.g. submerged terrestrial leaf-litter, is seldom assessed. There is also little information about how water quality might affect bryophyte–invertebrate interactions. Here, we compare macroinvertebrate colonisation of bryophytes and leaf-litter in streams of contrasting acidity. Litterbags containing the liverwort Nardia compressa, a moss mixture dominated by Platyhypnidium riparioides, and oak leaves (Quercus spp.) were exposed in replicate streams at the Llyn Brianne Stream Observatory (Wales, UK), and collected after 42 and 75 days. The family richness and abundance of invertebrates were significantly higher in circumneutral than acid samples. In circumneutral streams, both were significantly higher in oak and N. compressa than in P. riparioides. Under acid conditions, invertebrate colonisation of bryophytes declined markedly relative to oak, due largely to reduced numbers of the otherwise-dominant Leuctridae. Invertebrate assemblage composition differed with both acid–base status and litter type, with acid-tolerant taxa positively associated with bryophytes. We conclude that oak litter and N. compressa are equally valuable habitat under circumneutral conditions, but in acid streams bryophyte quality declines even for acid-tolerant taxa. This effect is consistent with invertebrates using bryophytes as more than physical habitat alone.
Starting Page	97
Ending Page	109
Page Count	13
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	745
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-11-05
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acidification Bryophytes Insects Leaf litter Macroinvertebrates Streams Freshwater & Marine Ecology Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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