Seasonal abundance, growth, feeding and age composition of flounder<i>(platichthys flesus</i>(l.)) populations of the severn estuary and bristol channel

Hardisty, M. W.; Badsha, K.S.

doi:10.1080/00207238608710279

Cited by 9 publications

(13 citation statements)

References 19 publications

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“…Parasite prevalence in the Oosterschelde is of the same magnitude as prevalences found in the Tamar estuary (Sproston & Hartley, 1941) and the Medway estuary (Van den Broek, 1979). These estuaries are all characterized by high abundances of flounder, the intermediate hosts of L. branchialis (Van den Broek, 1979;Hardisty & Badsha 1986;Hostens & Hamerlynck, 1992;Hamerlynck & Hostens, 1992). Sproston & Hartley (1941) found increased prevalences (up to 100%) in O + whiting collected in the Tamar estuary during the winter.…”

Section: Discussionmentioning

confidence: 99%

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The infection dynamics and dispersion pattern of Lernaeocera branchialis L. on 0+ whiting (Merlangius merlangus L.) in the Oosterschelde (SW Netherlands)

Damme

Hamerlynck

1992

Journal of Fish Biology

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Size and structure of the Lernaeocera branchialis population infecting O+ whiting in the Oosterschelde were studied during 1989. Two periods of successful transmission were distinguished. The first transmission wave occurs in late spring when the post-larval whiting enter the Oosterschelde. A second wave occurs in autumn. This pattern in the infection dynamics is possibly related to seasonal variations in spatial overlap of the intermediate (Platichthysflesus) and the final host (Merlangius merlangus). The dispersion pattern of Lernaeocera branchialis within the whiting population can bedescribed by the Poisson distribution. Possibleexplanations for the observed dispersion pattern are given. Evidence is presented that the rejection of pennella larvae is a key mechanism determining the abundance of L. branchialis in whiting. The potential impact of parasite-induced host mortality on population size and dispersion pattern of the parasite is discussed.

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Section: Discussionmentioning

confidence: 99%

“…Flounders ( P . Jesus) migrate to estuaries and coastal areas in early spring (Hardisty & Badsha, 1986). In the Oosterschelde, high numbers of flounder are (Sproston, 1941) and the life span of this stage is assumed to be short (Stekhoven & Punt, 1937).…”

Section: Novmentioning

confidence: 99%

The infection dynamics and dispersion pattern of Lernaeocera branchialis L. on 0+ whiting (Merlangius merlangus L.) in the Oosterschelde (SW Netherlands)

Damme

Hamerlynck

1992

Journal of Fish Biology

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“…Our reason for using a single designation for marine fish species that are abundant in estuaries is based on the conclusion that these species are always well represented in estuaries by their juveniles and that the relative contributions made by the different age classes of those species assigned by Elliott and Dewailly (1995) to their two categories tend to constitute a continuum. For example, in the Severn estuary, species such as Trisopterus luscus and Merlangius merlangus are represented almost exclusively by the 0+ age class (Claridge and Potter, 1984; Potter et al., 1988), whereas others are also represented by substantial, although fewer, numbers of either the 1+ and 2+ age classes, as was the case with Solea solea (Claridge and Potter, 1987) or the 1+ to 4+ age classes, as with Trisopterus minutus and Pleuronectes flesus (Claridge and Potter, 1984; Hardisty and Badsha, 1986). Furthermore, at least in the Severn estuary, Sprattusis sprattus is regarded by Elliott and Dewailly (1995) as marine seasonal migrants and therefore usually comprise adults, are represented mainly by their 0+ age class and, thus in this respect, are comparable with Clupea harengus, T. luscus, S. solea and M. merlangus (Titmus et al., 1978; Claridge and Potter, 1984, 1987; Potter et al., 1988), which are considered by Elliott and Dewailly (1995) to be marine juvenile migrants.…”

Section: Conclusion For the Ecological Guild Classificationmentioning

confidence: 99%

Composition, temporal changes and ecological guild classification of the ichthyofaunas of large European estuaries - a comparison between the Tagus (Portugal) and the Elbe (Germany)

Thiel

Cabral

Costa

2003

Journal of Applied Ichthyology

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Summary Fish species densities from 1025 hauls obtained with beam trawl and stow net catches from the southern Tagus and northern Elbe estuaries were analysed for two different periods of time between 1978 and 1997. The data were related with environmental factors to compare species composition and densities, contributions of different ecological guilds, structuring environmental key factors, intra‐annual cyclicity and interperiodical stability of ichthyofaunas in large European estuaries at different latitudes. Although the total number of species in both the Tagus and Elbe estuaries (Tagus: 57 species, Elbe: 58 species) was very similar, significant differences were estimated in species compositions, species densities and number of species, and individuals of the different ecological guilds between both estuaries. A total of 15 species occurred in both estuaries but only two of these species, the catadromous Anguilla anguilla and the marine estuarine opportunist Pleuronectes flesus, contributed substantially to the total abundance. Marine species together contributed more than 5% of the total number of species in the Tagus and Elbe estuaries, whereas their contribution in number of individuals amounted to 22% in the Tagus and only 9% in the Elbe. In terms of number of individuals, the ichthyofauna of the Tagus estuary was dominated by estuarine species (especially Pomatoschistus spp.) contributing 68% of the total abundance. In contrast, the fish fauna of the Elbe estuary was dominated by high numbers of anadromous species (88%) individuals, especially Osmerus eperlanus. Canonical corresponding analyses (CCA) indicated that, besides intra‐annual variables, salinity and mouth distance were two of the most important environmental factors structuring the fish communities in both estuaries. Moreover, water depth was found to be an important environmental factor in the Tagus estuary, whereas the water temperature substantially affected the ichthyofaunal composition in the Elbe estuary. In both estuaries, contributions by number of species and number of individuals of the different ecological guilds were not statistically different between the two periods considered, 1978–80 and 1995–97 for the Tagus, and 1981–86 and 1989–95 for the Elbe. Nevertheless, from 1981–86 until 1989–95 a remarkable increase of about 4.5 times in the densities of O. eperlanus was observed in the Elbe estuary, probably related to improved water quality, especially of oxygen conditions in the nurseries since 1990. This was also supported by the results of CCA, suggesting important influences of the years 1989 and 1990 on the Elbe estuary fish assemblage. Climate change as a result of global warming may be evident for the observed changes of the densities of P. flesus which decreased in the southern Tagus estuary and, in contrast, increased in the northern Elbe estuary during comparable periods of time. It is recommended to use the ecological guild classification scheme which was applied for the Tagus and Elbe estuaries for further studies of E...

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“…At West Thurrock, the picture is slightly different as G. zaddachi becomes less abundant, less important as a food source, and consequently flounders become more opportunistic in their feeding habits (Hardisty & Badsha, 1986;Chen, 1994). Other invertebrates are consumed or encountered in the process and, if they harbour parasitic infections, the parasite community consequently becomes more diverse.…”

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confidence: 99%

The parasite community infecting flounders, Platichthys flesus, in the tidal Thames

El-Darsh

Whitfield²

1999

J. Helminthol.

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The composition of the parasite fauna of the flounder,Platichthys flesus, retrieved from two locations in the tidal Thames is described in detail for the first time. The combined parasite species list of the flounders from Lots Road in the upper tideway and West Thurrock in the middle tideway consisted of one protozoan (Glugea stephani), one monogenean (Gyrodactylussp.), four larval digeneans (Cryptocotyle concava,Timoniella imbutiforme,T. praeterita, andLabratrema minimus), five adult digeneans (Derogenes varicus,Lecithaster gibbosus,Podocotylesp.,Plagioporus varius, andZoogonoides viviparus), one larval cestode (unidentified tetraphyllidean), one or possibly more larval nematodes (unidentified) plus five adult nematodes (Capillariasp.,Cucullanus heterochrous,C. minutus,Contracaecumsp. andGoeziasp.), two acanthocephalans (Pomphorhynchus laevisandAcanthocephalus anguillae), three copepods (Lepeophtheirus pectoralis,Acanthochondriasp. andLernaeocera branchialis), and one mollusc (unidentified glochidia). The overall parasite community of flounders from Lots Road and West Thurrock were compared in terms of species richness and diversity. The parasite community in flounders from the former location in the upper tideway was found to be less diverse than that of its counterpart at West Thurrock in the middle estuary. The component community of Lots Road flounders was dominated by the acanthocephalanPomphorhynchus laevis.

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Seasonal abundance, growth, feeding and age composition of flounder(platichthys flesus(l.)) populations of the severn estuary and bristol channel

Cited by 9 publications

References 19 publications

The infection dynamics and dispersion pattern of Lernaeocera branchialis L. on 0+ whiting (Merlangius merlangus L.) in the Oosterschelde (SW Netherlands)

The infection dynamics and dispersion pattern of Lernaeocera branchialis L. on 0+ whiting (Merlangius merlangus L.) in the Oosterschelde (SW Netherlands)

Composition, temporal changes and ecological guild classification of the ichthyofaunas of large European estuaries - a comparison between the Tagus (Portugal) and the Elbe (Germany)

The parasite community infecting flounders, Platichthys flesus, in the tidal Thames

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