The Larvae and Young Forms of Eucalanus Dana (Copepoda) From Tropical Atlantic Waters 1)

Björnberg, Tagea K. S.

doi:10.1163/156854067x00701

Cited by 9 publications

(6 citation statements)

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“…The average time from perception to 100 % ingestion of a R. alata cell was 1170 k 189 ms (standard error, n = 10). R. alata cell ingestions require more time because these cells must be repeatedly repositioned to a favorable ingestionangle using 2 so-called 'masticatory' hooks on each A2's coxopod (Bjornberg 1967). Observations of free-swimming nauplii confirmed the existence of a feeding current (Fig.…”

Section: Resultsmentioning

confidence: 83%

Feeding behavior of nauplii of the genus Eucalanus (Copepoda, Calanoida)

Paffenhöfer¹,

Lewis²

1989

Mar. Ecol. Prog. Ser.

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The goals of this and following studies were to describe how nauplii of related calanoid copepods gather and ingest phytoplankton cells, and to compare their feeding behavior with that of copepodids and adult females of the same species. Nauplii of the calanoids Eucalanus pileatus and E. crassus draw particles towards themselves creating a feeding current. They actively capture diatoms > 10 pm width with oriented movements of their second antennae and mandibles. The cells are displaced toward the median posterior of the mouth and then are moved anteriorly for ingestion. The nauplii gather, actively capture, and ingest particles using 2 pairs of appendages, whereas copepodids and females use at least 4 of their 5 pairs of appendages (second antennae, maxillipeds, first and second maxillae) to accomplish the same task. These nauplii are not able to passively capture small cells efficiently like copepodids and females because they lack a fixture similar to the second maxillae. Gathering and ingestion by late nauplii of E. crassus and E. pileatus require together an average of 183 ms for a cell of Thalassiosira weissflogii ( l 2 pm width) and 1.17 S fox Rhizosolenia alata (150 to 500 pm length). Although na.uplii of related species show little difference in appendage morphology, they differ markedly in feeding and swimming behavior. Their behavior is partly reflected in the behavior of copepodids and adult females.

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Section: Resultsmentioning

confidence: 83%

Feeding behavior of nauplii of the genus Eucalanus (Copepoda, Calanoida)

Paffenhöfer¹,

Lewis²

1989

Mar. Ecol. Prog. Ser.

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“…The study of zooplankton found along the continental shelf in the south and southeast regions of Brazilian has led to several publications which address, among other subjects, the systematic organization of taxonomic groups (Björnberg, 1967;Alvarez, 1986;Campaner & Honda, 1987;Vega-Pérez & Bowman, 1992;Bersano & Boxshall, 1994), as well as the ecological aspects (Moreira, 1973;Björnberg, 1980;Campaner, 1985;Liang & Vega-Pérez, 1994, 1995Vega-Pérez & Hernandez, 1997), physiological aspects (Yamashita, 1977;Yamashita & Moreira, 1981) and biogeographical aspects (Palácio, 1982) of different taxonomic groups.…”

Section: Introductionmentioning

confidence: 99%

The zooplankton of Santa Catarina continental shelf in southern Brazil with emphasis on Copepoda and Cladocera and their relationship with physical coastal processes

Domingos-Nunes

Resgalla

2012

lajar

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ABSTRACT. Very few studies have been carried out to exclusively investigate the zooplankton community of Santa Catarina State continental shelf, despite the economic and ecological importance of the area. This coastal region of southern Brazil presents highly relevant oceanographic processes, such as the strong influence of continental inputs, resurgence in the Cabo de Santa Marta Grande and River Plata plume water to the south. Two sampling cruises were carried out, in December 2005 and May 2006, in order to study temporal hydrological variations, and their influence on the biota of the region. Zooplankton samples for analysis were obtained by oblique hauls with Bongo nets at 33 sampling stations arranged in profiles perpendicular to the coast on each cruise. The predominant groups found in the samples were Copepoda, Cladocera, Salpidae and Chaetognatha, which presented higher densities at the stations closer to the coast. In the case of the December 2005 cruise, the salinity and temperature gradients perpendicular to the coast, promoted by the continental inputs to the north of the area and by the upwelling to the south, determined the limits of distribution of Acartia lilljeborgi and Penilia avirostris. However, the temperature and salinity gradients longitudinal to the coast determined on the May 2006 cruise did not explain the species distribution, indicating that biotic forcing mechanisms may have been active in the ecology of the system during this period.

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“…Al = first antenna, A2 = second antenna, Md = mandible, Mxl =first maxilla, ex = exopod, en = endopod. Scale bar= 100um (redrawn from Björnberg, 1967). dehydrated in a graded ethanol and propylene oxide series and embedded in tEPON resin (Tousimis Research Corporation).…”

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confidence: 99%