Notes on the biology of <i>Sertularia argentea</i> L.

Hancock, D. A.; Drinnan, R. E.; Harris, W. N.

doi:10.1017/s0025315400010158

Cited by 25 publications

(16 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…which has been said to breed from May to November in the Thames estuary (Hancock et al, 1956); but is in agreement with the data of Withers & Thorp (1977) who recorded settlement of S. argentea in Langstone Harbour from November to February. It seems almost certain that the latter is the same population as that sampled by us, and was therefore misidentified.…”

Section: Reproductive Periodsupporting

confidence: 91%

“…The morphological distinctions between the 2 species are slight: Cornelius (1979) followed some others in regarding them as conspecific, but more recently has provisionally included both in a key to the group while regarding separation as inconclusive (Cornelius & Ryland, 1990). Assuming that the Hancock et al (1956) was correctly identified, it is possible that in addition to reported morphological differences between the species there may be differing reproductive periods. Other records of the reproductive season(s) of S. cupressina/argentea were given by Cornelius (1979) and include every month of the year except January, a month now included by Withers & Thorp (1977) and ourselves.…”

Section: Reproductive Periodmentioning

confidence: 99%

See 1 more Smart Citation

The settlement and growth of Sertularia cupressina (Hydrozoa, Sertulariidae) in Langstone Harbour, Hampshire, UK

Schmidt

Warner

1991

Hydrobiologia

View full text Add to dashboard Cite

Aspects of the life cycle of the hydroid Sertularia cupressina were monitored over a period of 2 y using settlement panels. The reproductive period, determined by the presence of acrocysts and larval settlement, was November to January. Recently settled hydroids were more abundant on horizontal upward facing surfaces than on horizontal downward facing or vertical surfaces. The spatial dispersal of settlers was random. S. cupressina was a conspicuous and persistent component of fouling communities developing on both upward facing and vertical panels over 2 y. Following settlement in winter 1979-80, hydrocauli reached their greatest height between November 1980 and April 1981, but fouling and breakage of stems occurred during spring 1981. Regeneration from the tips of broken stems and from hydrorhizae occurred in June and July 1981.

show abstract

Section: Reproductive Periodsupporting

confidence: 91%

Section: Reproductive Periodmentioning

confidence: 99%

The settlement and growth of Sertularia cupressina (Hydrozoa, Sertulariidae) in Langstone Harbour, Hampshire, UK

Schmidt

Warner

1991

Hydrobiologia

View full text Add to dashboard Cite

show abstract

“…Its abundance is reflected by the large number of references (>180) with information about the species in the synonymy list of . At one time this hydroid constituted part of the "white weed" fishery in Europe, together with Sertularia argentea Linnaeus, 1758 and S. cupressina Linnaeus, 1758 (e.g., Hancock et al 1956;Berghahn & Offermann 1999;Wagler et al 2009). Dryed hydroid colonies were dyed and used for decorative purposes, but the market collapsed due to lack of demand.…”

Section: Hydrallmania Falcata (Linnaeus 1758) Fig 35mentioning

confidence: 99%

On a collection of hydroids (Cnidaria, Hydrozoa, Hydroidolina) from the west coast of Sweden, with a checklist of species from the region

Calder

2012

Zootaxa

View full text Add to dashboard Cite

An account is given of 48 species identified in a small collection of hydroids from the west coast of Sweden. Assigned to39 genera and 18 families, most are well-known from boreal waters of the North Atlantic Ocean. Campanulina paniculaG.O. Sars, 1874 is referred to Racemoramus, a new genus of leptothecates distinguished in part by having monopodialgrowth, rigid and non-segmented hydrocauli, and grape-like clusters of hydrothecae that arise at irregular intervals fromthe stem. The name Sertularia dumosa (now Lafoea dumosa) is taken to have been made available by Fleming (1820), notFleming (1828). As such, it is not threatened by a virtually unused subjective synonym (Lafoea cornuta Lamouroux,1821). Aselomaris michaeli Berrill, 1948 and Rhizorhagium navis Millard, 1959 are regarded as synonyms and combinedunder the binomen Pachycordyle michaeli (Berrill, 1948). Confusion in the literature over the identity of Sertularia teneraG.O. Sars, 1874 is addressed, and distinctive characters of the species are discussed. A species often misidentified as S.tenera is assigned to Sertularia spitzbergensis (Jäderholm, 1909); the name spitzbergensis is elevated in rank from sub-specific to specific, and assigned priority over its simultaneous synonym siberica Jäderholm, 1909 under the First ReviserPrinciple. Gonothecae of Clytia gigantea (Hincks, 1866) (type locality: Lamlash Bay, UK) are reported for the first timein material from Europe. Although much like Clytia hemisphaerica, this species is retained as valid due to its remarkablyrobust colony form, elongate and gradually tapered hydrothecae, and linguiform rather than wavy or pointed marginalcusps. Eudendrium album Nutting, 1896, Pachycordyle michaeli (Berrill, 1948), and the hydroid stage of Halitholus cir-ratus Hartlaub, 1913 are reported for the first time from the study area. A checklist of hydroids from the study area is included.

show abstract

“…The composition of the nigrosin-eosin solution (Hancock, 1951) used was: nigrosin (G. T. Gurr), 30 g.; eosin Y-water soluble (G. T. Gurr), 5g. ; distilled water, 300 ml.…”

Section: Morphological Studiesmentioning

confidence: 99%

“…Logically, spermatozoa which show detachment of the acrosome should also be placed in this group, but they have been treated separately because their incidence was determined at one centre only. (The acrosome is the cytoplasmic cap of the spermatozoon; it is often referred to as the galea capitis, but the term acrosome is preferable (Hancock, 1951). )…”

Section: Counting and Classification Of Abnormal Spermatozoamentioning

confidence: 99%

Semen characteristics and fertility in the bull

Bishop¹,

Campbell²,

Hancock³

et al. 1954

J. Agric. Sci.

112

View full text Add to dashboard Cite

1. Certain characteristics of bull semen have been examined at four artificial insemination centres in England. One hundred and twenty-one samples of semen, comprising 168 ejaculates from seventysix bulls of seven breeds, were examined. The semen from 119 tested samples was subsequently used to inseminate 4604 cows.The following semen characteristics were studied: volume of ejaculate; concentration of spermatozoa; incidence of dead spermatozoa; incidence of morphologically abnormal spermatozoa; initial fructose concentration; resistance of spermatozoa to temporature shock; methylene-blue reduction; O2 uptake; fructose utilization; visual evaluation of motility; impedance change frequency; and fertilizing capacity (conception rate).A clinical examination was made of the reproductive organs of each bull.2. Variations in the concentration of living spermatozoa and in the incidence of dead spermatozoa were found to account for most of the variations in the metabolic activity of semon: they also largely explained differences in physical activity as assessed by visual estimation of motility or by impedance change frequency.3. Although the rates of methylene-blue reduction, O2 uptake and fructolysis showed a close correlation with the numbers of living spermatozoa present, O2 uptake and fructolysis per living cell decreased with increasing cell concentration.4. Variations in metabolic activity showed no correlation with variations in the morphological characteristics of the spermatozoa, except in the case of spermatozoa with bent tails. These forms occurred in some samples as a result of staining treatment, but their incidence was positively correlated with the O2 uptake and fructolysis per living cell.5. There was evidence that highly active spermatozoa are more resistant to temperature shock than less active spermatozoa.

show abstract

Notes on the biology of Sertularia argentea L.

Cited by 25 publications

References 7 publications

The settlement and growth of Sertularia cupressina (Hydrozoa, Sertulariidae) in Langstone Harbour, Hampshire, UK

The settlement and growth of Sertularia cupressina (Hydrozoa, Sertulariidae) in Langstone Harbour, Hampshire, UK

On a collection of hydroids (Cnidaria, Hydrozoa, Hydroidolina) from the west coast of Sweden, with a checklist of species from the region

Semen characteristics and fertility in the bull

Contact Info

Product

Resources

About