Experimental studies of particle ingestion by the sand fiddler crab Uca pugilator (Bosc)

Robertson, J.Roy; Newell, Steven Y.

doi:10.1016/0022-0981(82)90102-2

Cited by 64 publications

(32 citation statements)

References 28 publications

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“…The bacterial population in aquatic systems usually appears as both free and attached to particles, and estimations of the attached fraction vary from less than 10% up to 90% of the total population (Bell & Albright 1981, Robertson & Newell 1982, Alldredge & Youngbluth 1985, Albright et al 1986, Alldredge et al 1986, Herndl 1988. While the fraction of free bacteria is easily accessible microscopically, an estimate of the attached fraction is more difficult to obtain since it requires determination of the size distribution of the particles hosting bacteria and establishment of a relationship between the size of the particles and the number of attached bacteria.…”

Section: Partitioning Of the Bacterial Populationmentioning

confidence: 99%

Role of TEP in the microbial food web structure. II. Influence on the ciliate community structure

Mari¹,

Rassoulzadegan²,

Brussaard³

2004

Mar. Ecol. Prog. Ser.

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The structure of the bacterial population (free vs. attached bacteria), variations in bacterial abundance and ciliate group composition were monitored as a function of transparent exopolymeric particle (TEP) concentration during Phaeocystis globosa blooms that developed in mesocosms. Two ciliate groups dominated at different stages of the blooms. The oligotrichous ciliate Strombidium spp. were dominant during the growth phase of the blooms, when TEP volume concentration was lower than 20 ppm. The hypotrichous ciliate Euplotes spp. emerged and became dominant after blooms peaked, when TEP concentration reached values between 20 and 50 ppm. The succession from Strombidium spp. to Euplotes spp. was closely related to TEP variation. Strombidium spp. depletion was apparently not caused by a reduction of prey availability due to TEP aggregation, as the bacterial concentration increased over time and the fraction of available bacteria for Strombidium spp. remained close to 90%, irrespective of variations in TEP concentration. Instead, the results of incubations conducted by adding S. sulcatum to seawater collected in the mesocoms suggest that Strombidium spp. disappearance may have been caused by direct TEP-mediated aggregation of the ciliates. The emergence of Euplotes spp. coincided with the formation of macroaggregates (favored by high TEP concentration), which provide them with the physical support required for feeding on attached bacteria. Our results suggest that variations of the size in the TEP pool may induce a ciliate population succession, modify the size distribution of the bacterial population and ultimately control the microbial food web structure and function.

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Section: Partitioning Of the Bacterial Populationmentioning

confidence: 99%

Role of TEP in the microbial food web structure. II. Influence on the ciliate community structure

Mari¹,

Rassoulzadegan²,

Brussaard³

2004

Mar. Ecol. Prog. Ser.

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“…Estes caranguejos alimentam-se de uma variedade de bactérias e microflora bentônicas, tais como diatomáceas e algas azuis que estão associadas com o complexo substrato organo-mineral (CRANE 1975). A detecção de alimento é feita através de quimiosensores localizados nas quelas e, possivelmente na região bucal (ROBERTSON et al 1980, 1981, ROBERTSON & NEWELL 1982. Experimentos com Uca rapax (Smith, 1870) demonstraram que estes animais cavam tocas em núme-ro maior do que o de indivíduos ali presentes e, portanto, cada animal não se limita a escavar apenas a sua toca.…”

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Distribuição e abundância dos caranguejos Uca Leach (Crustacea, Decapoda, Ocypodidae) na Baía de Guaratuba, Paraná, Brasil

Masunari

2006

Rev. Bras. Zool.

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Um estudo sobre distribuição espacial e abundância dos chama-marés Uca Leach, 1814 foi realizado na Baía de Guaratuba, Estado do Paraná. Foram coletados chama-marés de dez biótopos ao longo de um gradiente de salinidade de zero a 32 dentro da Baía de Guaratuba. Foram obtidas sete espécies, entre as quais, Uca mordax (Smith, 1870) que foi registrada somente em biótopos inundados por águas de baixas salinidades (de zero a 16). As demais espécies mostraram tolerância a uma ampla variação de salinidade, mas Uca maracoani (Latreille, 1802-1803) e Uca leptodactyla Rathbun, 1898 predominaram em águas mais salinas, de 14 a 32, enquanto U. burgersi Holthuis, 1967, Uca rapax (Smith, 1870), Uca thayeri Rathbun, 1900 e Uca uruguayensis Nobili, 1901 foram coletadas em mais de três biótopos e mostraram uma tendência ao eurihalismo, suportando salinidades de 4 a 32. Entretanto, outras características do substrato tais como porcentagem relativa de cascalho/areia/silte/argila, teor de matéria orgânica e presença de marismas, também, influenciaram a distribuição espacial destes caranguejos. U. leptodactyla foi registrada com densidade máxima de 240 ind.m-2, o mais alto valor conhecido.

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“…Macnae 1968, Warner 1969, Jones 1984, Frusher et al 1994, sediment characteristics such as silt/clay and organic content are especially important for deposit-feeders such as Uca spp. (Altevogt 1957, Miller 1961, Icely & Jones 1978, Frith & Brunnenmeister 1980, Robertson & Newell 1982a,b, Jaramillo & Lunecke 1988.…”

Section: Introductionmentioning

confidence: 99%

Comparative population dynamics of four fiddler crabs (Ocypodidae, genus Uca) from a North Brazilian mangrove ecosystem

Koch¹,

Wolff²,

Diele³

2005

Mar. Ecol. Prog. Ser.

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Experimental studies of particle ingestion by the sand fiddler crab Uca pugilator (Bosc)

Cited by 64 publications

References 28 publications

Role of TEP in the microbial food web structure. II. Influence on the ciliate community structure

Role of TEP in the microbial food web structure. II. Influence on the ciliate community structure

Distribuição e abundância dos caranguejos Uca Leach (Crustacea, Decapoda, Ocypodidae) na Baía de Guaratuba, Paraná, Brasil

Comparative population dynamics of four fiddler crabs (Ocypodidae, genus Uca) from a North Brazilian mangrove ecosystem

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