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Titolo:
The importance of aquatic margins to invertebrates in English chalk streams
Autore:
Harrison, SSC;
Indirizzi:
Inst Freshwater Ecol, River Lab, Wareham BH20 6BB, Dorset, England Inst Freshwater Ecol Wareham Dorset England BH20 6BB 6BB, Dorset, England
Titolo Testata:
ARCHIV FUR HYDROBIOLOGIE
fascicolo: 2, volume: 149, anno: 2000,
pagine: 213 - 240
SICI:
0003-9136(200009)149:2<213:TIOAMT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACROINVERTEBRATE COMMUNITY; SUBMERGED MACROPHYTES; RIVER REHABILITATION; ARTIFICIAL RIFFLES; HABITAT; ASSEMBLAGES; RESTORATION; ABUNDANCE; LAKE; MICRODISTRIBUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Harrison, SSC Inst Freshwater Ecol, River Lab, Wareham BH20 6BB, Dorset, England Inst Freshwater Ecol Wareham Dorset England BH20 6BB ngland
Citazione:
S.S.C. Harrison, "The importance of aquatic margins to invertebrates in English chalk streams", ARCH HYDROB, 149(2), 2000, pp. 213-240

Abstract

Standardized kick-sweep samples of invertebrates were taken from three habitats - mid-channel gravel, Ranunculus and marginal vegetation - in six lowland chalk streams, on four sampling occasions between May 1996 and January1997. Several types of marginal vegetation were sampled, including the stems and leaves of trailing terrestrial vegetation and semi-emergent marginalmacrophytes. There was little difference in invertebrate community composition between the different marginal vegetation types, despite fine-scale differences in habitat architecture. The invertebrate communities in mid-channel gravel, Ranunculus and marginal vegetation were very different from each other over most of the year, particularly in spring and winter. Each habitat. was characterised by a suite of invertebrates, reflecting the physical and biological differences between the habitats. Community diversity and equitability were greatest in the physically complex margins and least in the more simplystructured Ranunculus. Invertebrate abundance per sample was greatest in Ranunculus. Approximately one half of all taxa in the chalk streams showed no significant preference for any single habitat. Of those taxa that: significantly preferred one habitat, many more preferred marginal vegetation compared to either gravel or Ranunculus. Many taxa found throughout the investigation avoided gravel and Ranunculus, but very few taxa avoided marginal vegetation. Rare taxa also occurred more frequently in the margins. Marginal vegetationwas used by invertebrates both as a favoured site of oviposition and as a conduit between the aquatic and terrestrial environments. Margins thus acted as a focus for reproduction and recruitment for chalk streams. The relative importance of marginal vegetation for stream invertebrate biodiversity and reproduction is high relative to other mid-channel habitats. More attention should be given to this habitat than has been in the past, particularly in the fields of stream conservation and restoration.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 13:55:49