Researches on the Coast of Somalia. The Shore and the Dune of Sar Uanle

Vannini, Marco; Valmori, P.

doi:10.1080/03749444.1981.10736622

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…It occurs from Somalia to South Africa, including Madagascar, Mozambique and the Comoro Islands (Hartnoll 1973;Vannini and Valmori 1981;Dray and Paula 1998). According to those authors, it occupies tidal flats, sandy shores, mangroves and mud sandflats, with a preference for well-drained areas.…”

Section: Introductionmentioning

confidence: 97%

Population Biology and Breeding Period of the Sand-Bubbler Crab Dotilla Fenestrata (Brachyura: Ocypodidae) from Southern Mozambique

Litulo

Mahanjane

Mantelatto³

2005

Aquat Ecol

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The sand-bubbler crab Dotilla fenestrata (Hilgendorf, 1869) is the most common and abundant brachyuran in the intertidal area of many East African sandy shores. Monthly sampling surveys were performed from March 2001 to February 2002 at Praia do Triunfo, Southern Mozambique. At each sampling survey, 15 stations (0.25 m 2 ) were sampled to a depth sediment of 30 cm. Crabs were identified, sexed, and measured for carapace width (mm). A total of 2456 crabs were collected of which 1247 were males (mean±sd: 5.36±0.04 mm), 938 non-ovigerous females (5.03±0.03 mm) and 271 ovigerous females (5.15±0.06 mm). The overall size frequency distribution showed a unimodal pattern suggesting a stable population with continuous recruitment. A clear sexual dimorphism was observed, with males being larger than ovigerous females, which in turn, were larger than non-ovigerous females. The overall sex ratio did not differ from 1:1. The annual reproductive cycle of Dotilla fenestrata was continuous and ovigerous females were recorded throughout the year, with peaks of occurrence during the warmer months (February-August). Despite of this continuous cycle, few juveniles were observed during the study period. These observations and the maximum size attained by adults supports the hypothesis that for this burrowing crab, recruitment may occur in different habitat than that occupied by adults. However, the studied area is favourable for growth, since the analysed population attains sexual maturity in smaller sizes than that from close areas.

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Section: Introductionmentioning

confidence: 97%

Population Biology and Breeding Period of the Sand-Bubbler Crab Dotilla Fenestrata (Brachyura: Ocypodidae) from Southern Mozambique

Litulo

Mahanjane

Mantelatto³

2005

Aquat Ecol

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“…Dotilla fenestrata (Hilgendorf 1869), commonly known as the sand-bubbler crab, is a small species (Dray and Paula 1998, Gherardi et al 2002a, Flores et al 2005. It is distributed along the East African coast from Kenya to South Africa, and also occurs on Madagascar and the Comoro Islands (Barnard 1950, Hartnoll 1973, Vannini and Valmori 1981, Dray and Paula 1998, Gherardi and Russo 2001, Gherardi et al 2002a, Flores et al 2005, Litulo et al 2005. In South Africa, D. fenestrata is most abundant north of Durban (29°51′ S), but small numbers do exist in warm temperate regions as far south as the Breede River estuary (34°24′ S) (Day 1974, 1981, Branch et al 2010.…”

Section: Introductionmentioning

confidence: 98%

Activity and feeding ofDotilla fenestrata(Brachyura: Ocypodidae) in a warm, temperate South African estuary

Bulcao

Hodgson

2012

African Journal of Aquatic Science

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The activity of and consumption of organic material by the sand-bubbler crab Dotilla fenestrata was studied over neap and spring tides on a sheltered sand bank close to the mouth of the warm, temperate Kowie Estuary, South Africa. Crabs emerged from their burrows only after the tide receded, and it was light. Time to emergence therefore varied from about 30 minutes to three hours after exposure, depending on the time of low water in the early morning vs at midday. General activity of the crab population was longer on a spring tide (about five hours) than on a neap tide (about three hours). Maximum densities of active crabs were 140 m -2 and 41 m -2 on spring and neap tides, respectively. After emergence, crabs spent 60% to 80% of their time feeding. In the Kowie Estuary, D. fenestrata produced between 7 and 12 pseudofaecal pellets, average weight 0.0358 g per pellet, per minute. These pellets had a significantly lower organic and chlorophyll a content than the substratum, and it was estimated that crabs removed about 25% of the organic content from the sediment.

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“…For the time being this is the only WIO place where the crab has been found. No other record has been retrieved despite a thorough search in previously published contributions (mentioning Gecarcinidae) for the following places: central and western India (Trivedi et al, 2018;without Andaman & Nicobar); Seychelles (Haig, 1984); Red Sea (Holthuis, 1977); Somalia (Vannini & Valmori, 1981); Mozambique and South Africa (Türkay, 1973b;Emmerson, 2016); Comoros (Fourmanoir, 1954), Mayotte (Bouchard et al, 2013), Scattered Is. (Poupin et al, 2013a-b;Poupin, 2016;Poupin et al, 2018), and Madagascar (Türkay, 1974).…”

Section: Epigrapsus Politus Heller 1862mentioning

confidence: 99%

First record of Epigrapsus politus Heller, 1862 from Réunion Island (Decapoda, Brachyura, Gecarcinidae)

Huet¹,

Poupin

2020

Crustac.

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Researches on the Coast of Somalia. The Shore and the Dune of Sar Uanle

Cited by 12 publications

References 3 publications

Population Biology and Breeding Period of the Sand-Bubbler Crab Dotilla Fenestrata (Brachyura: Ocypodidae) from Southern Mozambique

Population Biology and Breeding Period of the Sand-Bubbler Crab Dotilla Fenestrata (Brachyura: Ocypodidae) from Southern Mozambique

Activity and feeding ofDotilla fenestrata(Brachyura: Ocypodidae) in a warm, temperate South African estuary

First record of Epigrapsus politus Heller, 1862 from Réunion Island (Decapoda, Brachyura, Gecarcinidae)

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