Reproductive Seasonality And Simultaneous Hermaphroditism In Two Species Of Siphonaria (Gastropoda: Pulmonata) From The Southeast Coast Of South Africa

Pal, Purba; Hodgson, Alan N.

doi:10.1093/mollus/eyi003

Cited by 12 publications

(19 citation statements)

References 23 publications

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“…However, support for an increase of spawn in the eelgrass, during the early summer of 2009/2010, came from samples collected in Kingfisher Creek (Table 2). Reproductive seasonality has also been reported (Pal & Hodgson, 2005) for S. capensis and S. aspera, important members of the rocky intertidal invertebrate community of the South Coast Province (Hodgson, 2010).…”

Section: Spawning Frequencymentioning

confidence: 78%

“…This pattern of indeterminate growth coupled with early maturation allows insurance against structural and physical changes in the environment. Spawning in summer does, however, have disadvantages (Pal & Hodgson, 2005) not least of which is rapid rise in surface temperature that requires some adaptation. For example, S. aspera attaches spawn to rock, but possesses a structural modification of the mucous matrix of the spawn coat (Pal & Hodgson, 2003) that gives a measure of resistance to desiccation associated with elevated temperatures.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Reproduction and growth of the endangered siphonariid limpetSiphonaria compressa(Pulmonata: Basommatophora)

Allanson¹,

Msizi²

2010

Invertebrate Reproduction & Development

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The critically endangered pulmonate marine mollusc, Siphonaria compressa, is the smallest of the Siphonariidae (4-4.5 mm shell length) and lives only on eelgrass leaves near low water of spring tide in the Knysna estuary and Langebaan Lagoon, South Africa. The species exhibits indeterminate growth. Mating has been observed between adult individuals but exchange of spermatophores has to be confirmed. The limpet has a relatively short life cycle and releases completely metamorphosed juveniles from a protective spawn packet after 13 days at 25ºC and 18 days at 17ºC incubation. An attempt is made to assess generation time using growth in laboratory held individuals matched to the von Bertalanaffy growth function, and supported by sampling and analysis of natural populations during spring and summer. A measure of support has been found for the laboratory growth model. Early attempts are made to suggest reasons for, and the possible evolution of, the miniaturization shown by S. compressa.

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Section: Spawning Frequencymentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Reproduction and growth of the endangered siphonariid limpetSiphonaria compressa(Pulmonata: Basommatophora)

Allanson¹,

Msizi²

2010

Invertebrate Reproduction & Development

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“…5). For example, potential differences in dynamics and availability of algae between the 2 habitats could have a strong effect on growth rate and survival and could reduce the resources to be allocated to reproductive effort for populations on seawalls (Quinn 1988b, Pal & Hodgson 2004. Additionally, a shortage of food on seawalls may affect intensity and relative importance of competitive interactions among different grazers.…”

Section: Discussionmentioning

confidence: 99%

Seawalls do not sustain viable populations of limpets

Moreira¹,

Chapman²,

Underwood³

2006

Mar. Ecol. Prog. Ser.

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Increasing urban development in coastal areas is leading to reduction and fragmentation of natural habitats and a proliferation of artificial structures, such as seawalls. These new structures provide a novel habitat for several organisms, but recent studies have shown differences between the composition of populations in assemblages inhabiting them and those present on natural rocky shores. Preliminary observations also suggested that populations of limpets may differ in size and reproductive output between seawalls and natural rocky shores in Sydney Harbour (Australia).To test hypotheses about the influence of artificial habitat on populations of marine invertebrates, we examined the densities, size and reproductive output of the pulmonate limpet Siphonaria denticulata at midshore intertidal levels on several seawalls and natural rocky shores in Sydney Harbour. Populations on seawalls were mainly composed of juveniles and small adults; large adults were generally found only on rocky shores. There were also significantly fewer and smaller egg masses on seawalls. Experimental manipulations suggested that differences in reproductive output are related to the maximal size that adults attain in each habitat. Populations on seawalls make a smaller contribution to the total reproductive output in any given area, and, thus, it can be predicted that replacement of natural habitats with seawalls may have negative effects on the maintenance of local populations. Populations of organisms living in different habitats in similar densities may show important differences in biological performance. Thus, differences in reproductive output between habitats, even at the same densities, will potentially influence dynamics of populations of limpets.

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“…It differs from Williamia radiata (RutHenSteineR et al 2007) in having a much smaller and single penis gland, inserted on the penis tip. For additional details of the siphonariid genital structures see PaL & HodGSon (2002, 2003, 2005 and PaL (2007).…”

Section: Discussionmentioning

confidence: 99%

“…Though most of them are entirely terrestrial, some primitive taxa are marine, and depend on the pelagic environment to complete their development. Within the family Siphonariidae, most taxa have planktotrophic veliger larvae (JabLonSKi & Lutz 1983, GRaHame & bRancH 1985, although some species undergo intra-capsular larval stage -a mode of development sometimes called direct development (PaL & HodGSon 2002), a term that has been used for the siphonariids (cHambeRS & mcQuaid 1994a, b, PaL & HodGSon 2003, 2005. Planktonic larval development is regarded as plesiomorphic within the family, and used as a systematic criterion to resolve their higher taxonomy and evolutionary relationships.…”

Section: Introductionmentioning

confidence: 99%

Shell and body structure of the plesiomorphic pulmonate marine limpet Siphonaria pectinata (Linnaeus, 1758) from Portugal (Gastropoda: Heterobranchia: Siphonariidae)

Simone¹,

Seabra²

2017

Folia Malacol.

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The shell and body structure of the plesiomorphic pulmonate false-limpet Siphonaria pectinata (Linnaeus) from the south coast of Portugal is presented in detail. All the systems are described and discussed, in order to create a phenotypic database, since the siphonariid relationships are controversial, and most of the recent attempts at their resolution have been molecular. Most siphonariids show several morphological peculiarities (e.g., flap-like head without tentacles, interrupted shell muscle, anterior portion of genitalia surrounding shell muscle) compared to the remaining pulmonates or even to heterobranchs. On the other hand, the odontophore structure, and the genital system, including the penis retractor muscle connected with the shell muscle, place them close to higher pulmonates. The siphonariids present a new mode of limpetisation, with the visceral structures placed inside the haemocoel instead of being located below the shell apex.

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Reproductive Seasonality And Simultaneous Hermaphroditism In Two Species Of Siphonaria (Gastropoda: Pulmonata) From The Southeast Coast Of South Africa

Cited by 12 publications

References 23 publications

Reproduction and growth of the endangered siphonariid limpetSiphonaria compressa(Pulmonata: Basommatophora)

Reproduction and growth of the endangered siphonariid limpetSiphonaria compressa(Pulmonata: Basommatophora)

Seawalls do not sustain viable populations of limpets

Shell and body structure of the plesiomorphic pulmonate marine limpet Siphonaria pectinata (Linnaeus, 1758) from Portugal (Gastropoda: Heterobranchia: Siphonariidae)

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