The Ecology of the Lough Ine Rapids with Special Reference to Water Currents: VI. Effects of the Rapids on the Hydrography of the South Basin

Bassindale, R.; Davenport, Elisabeth; Ebling, F. J.; Kitching, J. A.; Sleigh, M. A.; Sloane, J. F.

doi:10.2307/2256962

Cited by 53 publications

(39 citation statements)

References 4 publications

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“…The Rapids population (R) had a more similar genetic structure to the populations within Lough Hyne, although there was some evidence of gene flow with Irish coastal populations. The tidal flow regime during inflow probably explains why the Rapids site exchanged more genetic material with Lough Hyne sites than between Lough Hyne sites (some of the water moves towards L1 and L2, whereas no direct water flow occurs between L1 and L2; Bassindale et al 1957).…”

Section: Discussion (A) Marine Reserves Connectivity and Isolationmentioning

confidence: 99%

“…) in eastern parts of the lough, decrease westwards across the lough and are negligible in the north basin (Bassindale et al 1957). Outflow of water lasts approximately 8 h, with very slight water currents (as water is skimmed from the surface in the vicinity of the rapids) in all parts of the lough, with the exception of the Rapids.…”

Section: K1mentioning

confidence: 99%

“…The North Shore and Renoufs Bay intertidal habitats are both very sheltered rocky shores with large boulder areas. The communities at these sites are well developed, but the intertidal zone is limited in vertical extent because the tidal range is only approximately 1.5 m (Bassindale et al 1957). The population sampled in the Rapids experiences fast water currents (O250 cm s K1 ) and many of the dogwhelks migrate beneath boulders.…”

Section: K1mentioning

confidence: 99%

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Low genetic diversity in a marine nature reserve: re-evaluating diversity criteria in reserve design

Bell

Okamura

2005

Proc. R. Soc. B.

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Little consideration has been given to the genetic composition of populations associated with marine reserves, as reserve designation is generally to protect specific species, communities or habitats. Nevertheless, it is important to conserve genetic diversity since it provides the raw material for the maintenance of species diversity over longer, evolutionary time-scales and may also confer the basis for adaptation to environmental change. Many current marine reserves are small in size and isolated to some degree (e.g. sea loughs and offshore islands). While such features enable easier management, they may have important implications for the genetic structure of protected populations, the ability of populations to recover from local catastrophes and the potential for marine reserves to act as sources of propagules for surrounding areas. Here, we present a case study demonstrating genetic differentiation, isolation, inbreeding and reduced genetic diversity in populations of the dogwhelk Nucella lapillus in Lough Hyne Marine Nature Reserve (an isolated sea lough in southern Ireland), compared with populations on the local adjacent open coast and populations in England, Wales and France. Our study demonstrates that this sea lough is isolated from open coast populations, and highlights that there may be long-term genetic consequences of selecting reserves on the basis of isolation and ease of protection.

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Section: Discussion (A) Marine Reserves Connectivity and Isolationmentioning

confidence: 99%

Section: K1mentioning

confidence: 99%

Section: K1mentioning

confidence: 99%

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Low genetic diversity in a marine nature reserve: re-evaluating diversity criteria in reserve design

Bell

Okamura

2005

Proc. R. Soc. B.

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“…The lough is connected to the open sea via a shallow narrow channel (The Rapids) in which tidal currents achieve a maximum velocity of approximately 2 m S-' (Bassindale et al 1957). This study was conducted to the floor of the lough, at the base of a shell-gravel ramp l e a d n g down from The Rapids, at a depth of approximately 19 m. The sediment in this area has a median particle size of 1.68 mm and is composed of approximately 50% gravel, 35 % sand and 8 % silt-clay.…”

Section: Methodsmentioning

confidence: 99%

Spatial heterogeneity in subtidal gravel generated by the pit-digging activities of Cancer pagurus

Thrush¹

1986

Mar. Ecol. Prog. Ser.

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In a coarse gravelly substratum exposed to high current velocities the crab Cancer pagurus was observed to dig pits, approximately 30 cm in diameter and 10 cm deep. Experiments were conducted to identify macrobenthic recolonization processes and differences in abundance between pits and unmanipulated areas. Surveys of the abundance of recently dug pits indicate a frequency of approximately 9 pits 100 mA2. Analysis of species abundances in artificial pits at various times after construction revealed colonizing species to be highly variable. In a second experiment statistically significant differences in the abundances of various species were found between artificial pits and adjacent unmanipulated sediment, but trends in the data were not consistent between experiments. Generally, macrofaunal recolonization processes were haphazard. These results are contrasted with initial recolonization processes in soft sediments. The mobllity and large particle size of the sediment are considered to be important in precluding predictable recoloruzation patterns.

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“…Whirlpool Cliff is subjected to unidirectional flow, with current speeds reaching \ 100 cm s − 1 at peak inflow (Maughan and Barnes, 2000), whilst Glannafeen experiences moderate water currents (: 35 cm s − 1 ) resulting in considerable sedimentation. Goleen, Labhra Cliff and West Cliff are essentially very similar sites, with current velocities rarely reaching 5 cm s − 1 (Bassindale et al, 1957). Bullock Island, which is the site on the adjacent Atlantic coast, experiences severe wave action especially during winter storms.…”

Section: Study Sitementioning

confidence: 99%

Sponge morphological diversity: a qualitative predictor of species diversity?

Bell

Barnes

2001

Aquatic Conservation

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ABSTRACT1. To the non-specialist, problems are often associated with the quantification of sponge species diversity, as colour, shape and size can be highly variable within a single species. These variables can lead to an under-estimation of the contribution of sponges to the biodiversity of the benthos especially during biological surveys.2. Sponge species diversity (Shannon H% values), richness (mean number of species) and morphological diversity (Shannon H% values) were sampled at six sites (6 m depth intervals) on vertical (90°) and inclined surfaces (45°) experiencing different flow regimes at Lough Hyne Marine Nature Reserve (Ireland). Morphological diversity was sampled independently of species diversity. The time taken for the collection of both species and morphological diversity was recorded.3. Morphological diversity was positively correlated with both sponge species diversity (r 2 =0.87, pB0.05) and sponge species richness (r 2 = 0.70, pB0.05). Linear regression was found to be significant for both the relationships (pB0.05 for each F-value). A sigmoidal relationship (r 2 =0.97, pB 0.05) was found between morphological and species richness which proved to be significant (F-value 40.67, pB 0.05). Separate Bray-Curtis dendrograms and correspondence analysis of morphological and species community compositions at the six sites showed very similar clustering and four major clusters were identified.4. The results of the present study indicate that sampling of sponge morphological diversity, rather than sponge species diversity and richness may be used as a qualitative estimate of sponge species diversity. Sampling of morphological diversity is much less time consuming, both in the field and laboratory, than collecting species diversity data and no specialist knowledge is required. Consideration is given to the use of such relationships in biological surveys and bio-monitoring.

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The Ecology of the Lough Ine Rapids with Special Reference to Water Currents: VI. Effects of the Rapids on the Hydrography of the South Basin

Cited by 53 publications

References 4 publications

Low genetic diversity in a marine nature reserve: re-evaluating diversity criteria in reserve design

Low genetic diversity in a marine nature reserve: re-evaluating diversity criteria in reserve design

Spatial heterogeneity in subtidal gravel generated by the pit-digging activities of Cancer pagurus

Sponge morphological diversity: a qualitative predictor of species diversity?

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