ESTIMATION OF THE DENSITY OF BUCCINUM-UNDATUM (GASTROPODA) OFF DOUGLAS, ISLE-OF-MAN

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KIDEYS A.

HELGOLANDER MEERESUNTERSUCHUNGEN, cilt.47, sa.1, ss.35-48, 1993 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 47 Sayı: 1
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1007/bf02366183
  • Dergi Adı: HELGOLANDER MEERESUNTERSUCHUNGEN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.35-48
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The density of the common whelk (Buccinum undatum L.) off Douglas, Isle of Man, was determined by four methods: (1) pot sampling, (2) diving, (3) mark-recapture experiment, and (4) underwater television. Although the values obtained by these methods were comparable, the last two methods yielded overestimations of Buccinum density. The results from diving survey and from pot sampling showed a good agreement, indicating that pot sampling can be used to determine the density of the common whelk, provided a good estimate of the pot attraction area is available. The range of whelk density between February 1989 and August 1990 resulting from pot sampling was between 0.08 and 0.38 individuals m-2. The temporal fluctuations of the whelk densities are discussed in detail.