The Zonation of Epiphytic Hydroids on the Leaves of Some Posidonia oceanica (L.) DELILE Beds in the Central Mediterranean

Boero, Ferdinando; Chessa, Lorenzo Antonio; Chimenz, Carla; Fresi, Eugenio

doi:10.1111/j.1439-0485.1985.tb00318.x

Cited by 28 publications

(34 citation statements)

References 2 publications

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“…The timing and succession of epiphytes did not differ from previous studies made in Liguria (Relini Orsi et al, 1977;Boero et al, 1985), despite the dif- …”

Section: Resultscontrasting

confidence: 49%

“…The timing and succession of epiphytes did not differ from previous studies made in Liguria (Relini Orsi et al, 1977;Boero et al, 1985), despite the dif- Adult Leaves Intermediate Leaves ference in latitude and in the status of the meadow, both in terms of shoot density and depth of colonisation, from data collected at Ischia Island (Mazzella et al, 1989;Chessa et al, 1982). Hence, notwithstanding past regression, the meadow is in equilibrium with the environment and Posidonia oceanica shows a regular cycle in both plant growth and succession of epiphyte colonisation .…”

Section: Resultscontrasting

confidence: 45%

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Seasonal grazing and food preference of herbivores in a Posidonia oceanica meadow

Peirano¹,

Niccolai²,

Mauro³

et al. 2001

Sci. Mar.

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SUMMARY: Seasonal grazing of the fish Sarpa salpa (L.), the urchin Paracentrotus lividus Lamarck and the isopods Idotea spp. was compared with the C/N ratio of adult and intermediate leaves and epiphytes of Posidonia oceanica (L.) Delile, collected at three different depths. Despite seasonal differences in grazing, herbivores showed preferences throughout the year for adult leaves with more epiphyte and higher N contents. The maximum grazing on adult and intermediate leaves was observed in September and in June for fish and in March for urchins, whereas it was irregular for isopods. Grazing by the three herbivores was not related to their preference for leaves or epiphytes, notwithstanding the seasonal differences in their C and N contents. We concluded that herbivores show no preference for food type throughout the year and that seasonal consumption of P. oceanica is related mainly to herbivore behaviour.Key words: grazing, C/N ratio, seagrass, epiphytes. *Received February 16, 2000. Accepted May 15, 2001. 1996 and showed that the percentage of leaf production removed by herbivores in summer was correlated with both leaf specific growth rates and leaf production per shoot (Cebrian and Duarte, 1998).Differences in grazing might also be explained by different behaviour of the grazers. Massive schools of the fish S. salpa actively feed on P.oceanica leaves in Summer to accumulate reserves for reproduction. In winter, adults migrate to greater depths, whereas young fish, in shallow waters, eat preferentially small crustaceans (Bini, 1968;Tortonese, 1975, Francour, 1997 and turf epilithic algae (Havelange et al., 1997).P. lividus forms true populations in P. oceanica meadows, where high densities may have a heavy impact on the meadow (Kirkman and Young; Nedelec and Verlaque, 1984). Even though the urchins reproduce throughout the year (Tortonese, 1965;Fenaux 1968), major spawning is concentrated in spring and summer (Fenaux 1968;Azzolina and Willsie, 1987) and is related to the lowest consumption of seagrass (Semroud and Kada, 1987). While the young urchins feed on both rhizomes and leaves, the adults (>2 cm diameter) have a low-specialised diet and graze preferentially, on the highly epiphytized distal part of the leaves at nigth (Nedelec and Verlaque, 1984;Zupo and Fresi, 1984).Little is known about the behaviour of the isopods. The diet of the isopods I. baltica balsteri was investigated by Lorenti and Fresi (1982), who observed prolonged survival of the animal feeding on living leaves of P. oceanica.Until now, it is not clear whether seasonal grazing is related to leaf or epiphyte quality of food or depends on other factors. The aim of the present work is to assess the relationships between grazing pressure and food availability and C and N contents, both in time and space. For this purpose three stations along a depth gradient were observed during one year. Two levels of food were considered: a) leaves (adult and intermediate) and b) epiphytes (divided into major taxa). Seasonal variations in food quality were ...

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“…The timing and succession of epiphytes did not differ from previous studies made in Liguria (Relini Orsi et al, 1977;Boero et al, 1985), despite the dif- …”

Section: Resultscontrasting

confidence: 49%

Section: Resultscontrasting

confidence: 45%

Seasonal grazing and food preference of herbivores in a Posidonia oceanica meadow

Peirano¹,

Niccolai²,

Mauro³

et al. 2001

Sci. Mar.

View full text Add to dashboard Cite

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“…These include M. obliqua known from the Posidonia oceanica seagrass meadows of the Mediterranean Sea (Boero 1981a, Boero et al 1985Fresi et al 1982, Bouillon et al 2004, the eastern Atlantic (Calder 1997) and Japan (Hirohito 1983); M. spinulosa is known from South Africa, the South Atlantic (Millard 1975) and Japan (Yamada 1959, Hirohito 1995; and M. flexuosa (as M. pulchella, see later discussion) is reported from the Mediterranean Sea and South Africa (Millard 1975). A key to species of Monotheca is given.…”

Section: Introductionmentioning

confidence: 99%

Review of the genus Monotheca (Hydrozoa: Leptolida) from Australia with description of a new species and a note on Monothecella Stechow, 1923

Watson¹

2011

Mem. Mus. Vic.

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Monotheca Nutting, 1900 is a genus with few known species worldwide. It is an artificial genus, as some species of the Plumulariidae sometimes have one or two hydrocladial hydrothecae and are thus borderline between Monotheca and Plumularia. This review considers only Australian species with consistently monothecate hydrocladia; species with more than one hydrotheca on the hydrocladium are considered to belong to Plumularia. Ten species referrable to Monotheca are reported from southeast Australia; three are synonymised here in other species, four are presently known to be endemic to Australia and one species, Monotheca amphibola, is described as new. The gonosome of Monotheca togata is described for the first time. Monothecella is synonymised in Monotheca. A key to the Australian species of Monotheca is given.

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“…The polyp stages of marine hydrozoans may be found on a wide variety of natural and artificial substrata, including seagrasses and intertidal algae Boero et al, 1985;Gili and Hughes, 1995). Some species are found mainly, or only, on specific plant substrata, often in extreme environments, such as the rocky intertidal zone.…”

Section: Introductionmentioning

confidence: 99%

The effects of exposure to wave action on the distribution and morphology of the epiphytic hydrozoans Clava multicornis and Dynamena pumila

Rossi¹,

Gili²,

Hugues³

2000

Sci. Mar.

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SUMMARY:The spatial distribution patterns of two species of epiphytic hydrozoans, Clava multicornis and Dynamena pumila, on the intertidal alga Ascophyllum nodosum were studied in adjacent wave-sheltered and wave-exposed areas. Clava were more abundant on the wave-sheltered algae than on the wave-exposed fronds, and in both areas occupied the basal and middle sections of the algae. There was no difference in the abundance of Dynamena between the wave-sheltered and waveexposed areas, but in both areas Dynamena were most abundant on the basal and apical sections of the algae than on the central sections. The number of hydranths per colony of Clava was higher in the sheltered area than in the exposed area. The hydrocauli of Dynamena on the wave-exposed algae bore fewer hydrothecae than those on the sheltered algae. The proportion of Dynamena hydrothecae that contained hydranths was close to 100% in the sheltered area, but only 70% in the exposed area. It was concluded that variations in distribution and morphology could be caused by the direct or indirect effects of one or more variables, including wave action, feeding rates, and exposure to solar radiation. Experiments are required to elucidate the specific effects of these variables.

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The Zonation of Epiphytic Hydroids on the Leaves of Some Posidonia oceanica (L.) DELILE Beds in the Central Mediterranean

Cited by 28 publications

References 2 publications

Seasonal grazing and food preference of herbivores in a <i>Posidonia oceanica</i> meadow

Seasonal grazing and food preference of herbivores in a <i>Posidonia oceanica</i> meadow

Review of the genus Monotheca (Hydrozoa: Leptolida) from Australia with description of a new species and a note on Monothecella Stechow, 1923

The effects of exposure to wave action on the distribution and morphology of the epiphytic hydrozoans <i>Clava multicornis</i> and <i>Dynamena pumila</i>

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