Notes on the ecology and distribution of non-marine ostracods in Australia

Deckker, Patrick De

doi:10.1007/bf00008120

Cited by 85 publications

(57 citation statements)

References 27 publications

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“…In Ostracods, it is known that conductivity modulates hatching phenology, survival and larval moult but its role is contrasting (De Deckker, 1983;Mezquita et al, 1999). In fact the appearance of adult stages was delayed and mean size of adult stage decreased with conductivity decreasing.…”

Section: Discussionmentioning

confidence: 99%

Hatching phenology and voltinism of Heterocypris barbara (Crustacea: Ostracoda) from Lampedusa (Sicily, Italy)

2013

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Section: Discussionmentioning

confidence: 99%

Hatching phenology and voltinism of Heterocypris barbara (Crustacea: Ostracoda) from Lampedusa (Sicily, Italy)

2013

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“…This condition has been described for 10 or so species from a range of genera (see Bauer, 1940;Hoff, 1942;McKenzie, 1971;Tetart, 1975;Bell, 1982;De Deckker, 1983;Brohnstein, 1988, Chaplin & Ayre, 1989 and is generally assumed to reflect a reliance on alternative modes of reproduction. Asexual (parthenogenetic) reproduction is thought to be associated with populations without males whereas a reliance on sexual (amphimictic) reproduction is presumed for the mixed-sex populations (Hoff, 1942;McKenzie, 1971;Bell, 1982;De Deckker, 1983;Brohnstein, 1988).…”

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confidence: 99%

Variation in the mode of reproduction among individuals of the ostracod Candonocypris novaezelandiae

Chaplin

1992

Heredity

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This study describes the results of laboratory breeding experiments designed to determine the mode of reproduction of female Candonocypris novaezelandiae from populations with and without males. Two morphological forms of this species were studied: a large-green and small-brown morph. Large-green females from populations without large-green males invariably generated genotypically identical daughters by parthenogenesis, regardless of the presence or absence of males in the laboratory cultures. In contrast large-green females from a population that included large-green males, when they had the opportunity for fertilization, usually produced genotypically diverse offspring of both sexes. These females were probably sexually reproducing. Unmated females from the mixed-sex population did not reproduce. The small-brown morph was collected from a single water body in which it was represented by both sexes and co-occurred with large-green parthenogenetic females. Most of the small-brown females tested reproduced sexually in the presence of males or did not reproduce in the absence of males. One small-brown unmated female, however, reproduced by parthenogenesis. Available evidence indicates that the field population of the small-brown morph includes both sexual and parthenogenetic females and that the relative abundance of the parthenogenetic females is increasing with time. The sexual and asexual forms within and between morphs are probably independent.

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“…H. barbadensis was reported in the Barbados and Japanese rice fields (Broodbakker 1983;Okubo 1990) and from a permanent lake in Jamaica (Holmes 1997). Candonocypris novaezelandiae has indeed a wider distribution area, as it is present in lakes and ponds in Australia, New Zealand, New Caledonia islands, China, Spain and South Africa (Sars 1924;De Deckker 1981;De Deckker 1983;Martens 1984;Eagar 1994;Martens et al 1998;Yu et al 2010;Valls et al 2013), in the river Nile (Ebtesam 2010) and in fishponds in Japan (Okubo 1975). Also, C. subglobosa has been commonly cited in worldwide tropical wetlands, usually including rice fields, from Africa, America, Asia and Europe (Martens and Toguebaye 1985).…”

Section: Resultsmentioning

confidence: 99%

Rice fields as facilitators of freshwater invasions in protected wetlands: the case of Ostracoda (Crustacea) in the Albufera Natural Park (E Spain)

2014

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Background: Previous studies have identified rice fields in the Mediterranean region as 'hot spots' for the introduction of alien freshwater organisms. Consequently, special attention should be paid when rice fields are located inside or near protected areas for the conservation of native, endangered species. To analyse the relationship between rice field environmental traits and the ecology of aquatic invaders, a study of zoobenthic communities was carried out in JulySeptember 2008 and May-August 2009 in ten rice fields located in the Albufera Natural Park (E Spain), with focus on Ostracoda.Results: A total of nine ostracod species were found including four considered exotic: Candonocypris novaezelandiae, Stenocypris macedonica, Cypris subglobosa and Hemicypris barbadensis. The presence of H. barbadensis is remarkable, which is recorded for the first time in Europe and S. macedonica in the Iberian Peninsula. A checklist of Ostracoda from Albufera Natural Park is presented, including 11 exotic species, mostly unknown from Holocene sedimentary records. The analysis of ostracod assemblages showed a significant relationship between oxygen content and ostracod species associations, suggesting that their abundance are partially controlled by habitat variables in the rice fields. The exotic species C. novaezelandiae was more abundantly collected in samples with reduced oxygen concentrations, in contrast to other native species whose abundances were lower in such conditions. Conclusions: Rice fields in Mediterranean areas present a summer inundation period which is unlikely in natural temporary water bodies in the area and which may facilitate invasion by (sub-)tropical species. Lower proportion of exotic to native ostracods is observed in less disturbed areas compared to rice fields with intense human activities. We emphasize the role of anthropogenic effects in the dispersal and colonization processes of exotic ostracods and their particular strong influence in the protected areas closest to rice fields.

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Notes on the ecology and distribution of non-marine ostracods in Australia

Cited by 85 publications

References 27 publications

Hatching phenology and voltinism of Heterocypris barbara (Crustacea: Ostracoda) from Lampedusa (Sicily, Italy)

Hatching phenology and voltinism of Heterocypris barbara (Crustacea: Ostracoda) from Lampedusa (Sicily, Italy)

Variation in the mode of reproduction among individuals of the ostracod Candonocypris novaezelandiae

Rice fields as facilitators of freshwater invasions in protected wetlands: the case of Ostracoda (Crustacea) in the Albufera Natural Park (E Spain)

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