Shallow-Water Zonation of Sea-Loch Benthos and Its Relation to Hydrographic and Other Physical Features

Gage, J. D.

doi:10.1017/s0025315400022177

Cited by 33 publications

(28 citation statements)

References 13 publications

(11 reference statements)

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“…The depth of the major constriction in the range of salinity observations for the relevant stations given in Gage (1974) occurs a little deeper than the steepest slope in the reciprocal averaging representation of the faunal gradient. This may simply be because the depth of the observations was not corrected to M.T.L.…”

Section: Faunal Zonationmentioning

confidence: 91%

“…Envelopes of the salinity range from observations at different depths made by the Scottish Marine Biological Association over 5 years are given by Gage (1974). These suggest a strong correlation between the pattern of salinity range and mean score with depth.…”

Section: Reciprocal Averaging Of Pooled Transect Datamentioning

confidence: 98%

“…The shallow assemblage contains a high proportion of species which are recorded either from the Baltic (records in Gerlach & Riemann, 1973, 1974 or from the lower salinity regions of British estuaries (Capstick, 1959 (Catalaimus) maxweberi. The deep assemblage contains few species which are common in brackish water, except for Enchelidium marinum which has been recorded from the Baltic, and Spirinia {Spirinia) parasitifera and Monoposthia costata which are found in the Blyth estuary.…”

Section: Nematodamentioning

confidence: 99%

“…The marked pattern of vertical zonation in the nearshore distributions of benthic fauna in sea-lochs seems to be controlled by the degree of fluctuation and extent of depression in salinity (Gage, 1974). The different vertical patterns in the abundances of species can be related to their known tolerances to reduced and fluctuating salinity.…”

Section: Introductionmentioning

confidence: 99%

“…Two sites were chosen for the present study, Transects 4 and 5 of Gage (1974) in Loch Etive. From the earlier study one seemed to only just contain the faunal discontinuity within the belt of samples taken at 1 m depth intervals.…”

Section: Introductionmentioning

confidence: 99%

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Nearshore zonation of benthic fauna, especially Nematoda, in Loch Etive

Warwick¹,

Gage²

1975

J. Mar. Biol. Ass.

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The vertical distribution of the benthic fauna, including Nematoda, of soft sediments in shallow water was studied along nearshore transects at two sites in Loch Etive and compared with transects worked there previously. The mathematical techniques of hierarchical classification and reciprocal averaging ordination were applied to the species abundances along the transects in an attempt to summarize the data and describe the faunal zonation in a clear and objective way. The inverse reciprocal averaging ordination of pooled transect data described the zonation for all species at each site as a faunal gradient with a single large step at a depth where hydrographic conditions were most variable. This was the most satisfactory description of zonation since it indicated the pattern of sharp faunal change at these critical depths better than previously and allowed direct comparison between transects.The vertical distribution of the Nematoda alone could be simplified to a pattern which paralleled that of the other fauna. A single step or break demarcated a shallow brackish assemblage from a typically marine assemblage found in deeper water. Comparison with brackish fauna of the Baltic and from British estuaries illustrate the coherent nature of the brackish component. Zonation of many nematode species paralleled closely previously published descriptions of zonation in the Exe estuary, indicating the dominant effect of salinity governing distribution along the Etive transects.Classification techniques based on faunal indices of affinity between stations along the transects were less satisfactory. Different indices of faunal similarity yielded different patterns of hierarchy, although an index based on presence/absence data yielded results similar to reciprocal averaging.A group of species intermediate between the brackish and marine elements was isolated from the non-nematode component, but this was not reflected in the nematodes.

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Section: Faunal Zonationmentioning

confidence: 91%

Section: Reciprocal Averaging Of Pooled Transect Datamentioning

confidence: 98%

Section: Nematodamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nearshore zonation of benthic fauna, especially Nematoda, in Loch Etive

Warwick¹,

Gage²

1975

J. Mar. Biol. Ass.

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The status and ecology of reefs ofSerpula vermicularis L. (Polychaeta: Serpulidae) in Scotland

Moore

Saunders

Harries

1998

Aquatic Conserv: Mar. Freshw. Ecosyst.

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1. The distribution and abundance of reefs of Serpula vermicularis was examined in Loch Creran, the only known remaining site of reefs of this species in Scotland. In view of the decline in populations elsewhere, the aims included assessment of the importance of the Scottish population in terms of conservation of the reef habitat and the establishment of a baseline against which future changes could be gauged. A further objective was to determine appropriate conservation management of the reefs by examining the influence of both natural and anthropogenic factors. 2. Reefs were largely restricted to a depth range of 1–13 m. Factors controlling the depth distribution are discussed. 3. Serpula vermicularis reefs colonized a variety of substrata, but predominantly grew on lamellibranch shells on a seabed of muddy sand. There was some evidence that reef abundance was influenced by the availability of suitable substrata. 4. A belt of scattered reefs fringed much of the coastline of the loch with profuse reef development at two sites, where reef coverage exceeded 10% of the seabed. In terms of total abundance of Serpula vermicularis reefs, Loch Creran represents the major world site for reef development. It is concluded that the reefs of Loch Creran are of significant nature conservation importance and grounds for the establishment of conservation management are discussed. 5. Reef development is apparently curtailed in areas of strong currents and high flushing rate. There is evidence that human activity has adversely influenced reef growth through the discharge of organic factory effluent and the physical disturbance caused by mooring ground tackle. Scallop dredging also represents a significant threat to the persistence of serpulid reefs. Methods of minimising damage to this rare and fragile feature are discussed. © 1998 John Wiley & Sons, Ltd.

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The status and ecology of reefs of Serpula vermicularis L. (Polychaeta: Serpulidae) in Scotland

Moore¹,

Saunders²,

Harries³

1998

Aquatic Conserv: Mar. Freshw. Ecosyst.

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1. The distribution and abundance of reefs of Serpula 6ermicularis was examined in Loch Creran, the only known remaining site of reefs of this species in Scotland. In view of the decline in populations elsewhere, the aims included assessment of the importance of the Scottish population in terms of conservation of the reef habitat and the establishment of a baseline against which future changes could be gauged. A further objective was to determine appropriate conservation management of the reefs by examining the influence of both natural and anthropogenic factors.2. Reefs were largely restricted to a depth range of 1 -13 m. Factors controlling the depth distribution are discussed.3. Serpula 6ermicularis reefs colonized a variety of substrata, but predominantly grew on lamellibranch shells on a seabed of muddy sand. There was some evidence that reef abundance was influenced by the availability of suitable substrata. 4. A belt of scattered reefs fringed much of the coastline of the loch with profuse reef development at two sites, where reef coverage exceeded 10% of the seabed. In terms of total abundance of Serpula 6ermicularis reefs, Loch Creran represents the major world site for reef development. It is concluded that the reefs of Loch Creran are of significant nature conservation importance and grounds for the establishment of conservation management are discussed.5. Reef development is apparently curtailed in areas of strong currents and high flushing rate. There is evidence that human activity has adversely influenced reef growth through the discharge of organic factory effluent and the physical disturbance caused by mooring ground tackle. Scallop dredging also represents a significant threat to the persistence of serpulid reefs. Methods of minimising damage to this rare and fragile feature are discussed.

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Shallow-Water Zonation of Sea-Loch Benthos and Its Relation to Hydrographic and Other Physical Features

Cited by 33 publications

References 13 publications

Nearshore zonation of benthic fauna, especially Nematoda, in Loch Etive

Nearshore zonation of benthic fauna, especially Nematoda, in Loch Etive

The status and ecology of reefs ofSerpula vermicularis L. (Polychaeta: Serpulidae) in Scotland

The status and ecology of reefs of Serpula vermicularis L. (Polychaeta: Serpulidae) in Scotland

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