The copepodid stages ofDrepanopus forcipatus giesbrecht, with notes on the genus and a comparison with other members of the family Clausocalanidae (Copepoda Calanoida)

Hulsemann, Kuni

doi:10.1007/bf02365642

Cited by 21 publications

(16 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Samples were preserved in 4% formalin (Boltovskoy, 1981). The mesozooplankton organisms were identified to the lowest possible taxonomic level under a Wild M5 stereomicroscope, using the appropriate literature (Heron & Bowman, 1971;Lang, 1975;Bradford et al, 1988;Hulsemann, 1991;Mazzocchi et al, 1995;Boltovskoy, 1999).…”

Section: Methodsmentioning

confidence: 99%

Micro and mesozooplankton composition during winter in Ushuaia and Golondrina Bays (Beagle Channel, Argentina)

2007

View full text Add to dashboard Cite

The current paper analyses the micro and mesozooplankton in Ushuaia and Golondrina Bays, the first research on these plankton fractions of these areas in wintertime (August 2004). The number of microzooplankton and mesozooplankton taxa was higher in Ushuaia Bay than in Golondrina Bay. Aloricate ciliates predominated over tintinnids in microzooplankton and holoplankton over meroplankton in mesozooplankton in both bays. Ctenocalanus citer, Drepanopus forcipatus and Clausocalanus brevipes presented the highest frequency of occurrence. Among the meroplankton, Halicarcinus planatus and Munida gregaria were the most frequent decapod larvae in both bays. The distribution of the different sampling station groups of microzooplankton and mesozooplankton as determined by cluster analysis suggests the influence of natural conditions in each bay and anthropogenic environmental differences between the two bays. RESUMOEste trabalho analisa o micro e o mesozooplâncton das Baías Ushuaia e Golondrina, constituindo a primeira pesquisa realizada nessas áreas sobre estas frações do plâncton no inverno (agosto 2004). O número dos taxa do microzooplâncton e do mesozooplâncton foi mais elevado na Baía Ushuaia do que na Baía Golondrina. Os ciliados aloricados foram dominantes sobre os tintinídeos, enquanto que no mesozooplâncton o holoplâncton foi dominante nas duas baías. Ctenocalamus citer, Drepanopus forcipatus e Clausocalamus brevipes foram as espécies mais freqüentes. No meroplâncton, Halicarnus planatus e Munida gregaria foram as larvas de decápodes mais freqüentes em ambos os locais. Os diferentes grupos de estações formados em função do microzooplâncton e do mesozooplânkton, e detectados na análise de agrupamento, sugerem a influência de condições naturais em cada baía e de diferenças ambientais antropogénicas entre as duas baías.Descriptors: Microzooplankton,

show abstract

Section: Methodsmentioning

confidence: 99%

Micro and mesozooplankton composition during winter in Ushuaia and Golondrina Bays (Beagle Channel, Argentina)

2007

View full text Add to dashboard Cite

show abstract

“…An epicuticular extension of a limb segment is a denticle. Somites are numbered according to their relative developmental age, following Hulsemann (1991). Total length, measured in lateral view and given as prosome length/urosome length = total, includes caudal rami and rostrum but does not include the portion of the prosome that overlaps the urosome.…”

Section: Specimens and Methodsmentioning

confidence: 99%

Pseudocyclops schminkei (Copepoda, Calanoida, Pseudocyclopidae): a new species from Okinawa

2009

View full text Add to dashboard Cite

Both genders of Pseudocyclops schminkei n. sp. are described from a pearl Wshery aquarium on Zamami Island, Okinawa, Japan; it is the 37th species of the genus. Pseudocyclops schminkei sp. nov. diVers from other species of the magnus species group in the shape of the lobes of distal exopodal segment of the male left leg 5, and the morphology of setae on middle and distal exopodal segment of male right swimming leg 2. Aspects of the morphology of P. xiphophorus and P. bilobatus are redescribed, and an unnamed Pseudocyclops sp. from the Shedd Aquarium in Chicago, IL, is brieXy noted. Females of P. schminkei sp. nov., P. xiphophorus and Pseudocyclops sp. could not be separated from each other with the small number of specimens available in this study for the former two species.

show abstract

“…Stage-specific identification of D. forcipatus and C. australis was performed in accordance with descriptions by Hulsemann (1991) and Bradford et al (1988), respectively. Adult (C6) and copepodite stages (C1-C5) of both species were counted under a stereomicroscope (Leica M8).…”

Section: Copepod Counting and Stagingmentioning

confidence: 99%

FEEDING AND REPRODUCTIVE ACTIVITY OF THE COPEPODS Drepanopus forcipatus AND Calanus australis DURING LATE SUMMER ON THE SOUTHERN PATAGONIAN SHELF (ARGENTINA, 47°-55°S)

et al. 2014

View full text Add to dashboard Cite

Drepanopus forcipatus and Calanus australis are key planktonic copepods on the southern Patagonian shelf. Their feeding and reproductive patterns and population status were investigated during late summer, when environmental conditions may be critical. The presence of food in the gut and food-pellet length were recorded in adult females and the most abundant copepodite stages. Diet composition was also studied in adult females. Female reproductive status was evaluated by gonad staging. Despite generally low feeding conditions and decreasing seasonal temperature, both copepods fed to some degree. The most numerous copepodites and adult females of both species showed similarly low feeding activity. About half of the adult females of the two species and C5s of C. australis contained food in their guts, but the proportion of fed C4-females of D. forcipatus was much lower. All copepods were generally feeding at low or intermediate levels. Gonad stage distribution and population structure showed low but still ongoing reproduction in both species. Gut content findings suggest a preference for smaller nanoplanktonic particles, especially dinoflagellates by D. forcipatus, and for autotrophic prey, particularly large diatoms by C. australis. The feeding and reproduction patterns of the two copepods were likely influenced by the distributions of potential food resources and temperature. RESUMODrepanopus forcipatus e Calanus australis são copépodos planctônicos relevantes na plataforma da Patagônia Austral. Seus padrões de alimentação, reprodução e status populacional foram investigados durante o fim do verão, quando as condições ambientais podem ser críticas. A presença de alimento no abdomen e o tamanho das pelotas alimentares foram registados em fêmeas adultas e nos estágios mais abundantes de copepodito. A composição da dieta também foi estudada em fêmeas adultas. O status reprodutivo das fêmeas foi avaliado através do estágio gonadal. De modo geral, apesar das baixas condições alimentares e diminuição sazonal da temperatura, ambos os copépodos se alimentaram. Os copepoditos mais numerosos e as fêmeas adultas de ambas espécies mostraram baixa atividade alimentar. Cerca de metade das fêmeas adultas das duas espécies e C5s de C. australis apresentaram alimento em seu intestino, porém a proporção de fêmeas D. forcipatus C4 alimentadas foi consideravelmente menor. De modo geral, todos os copépodos se alimentaram entre níveis baixo e intermediário. A distribuição do estágio gonadal e a estrutura populacional apresentaram reprodução baixa, mas contínua para ambas as espécies. Os alimentos encontrados no intestino sugerem uma preferência por partículas nanoplanctônicas, especialmente dinoflagelatos em D. forcipatus, e por presas autotróficas, particularmente grandes diatomáceas em C. australis. Os padrões de alimentação e reprodução dos dois copépodos foram provavelmente influenciados pela distribuição de recursos alimentares e temperatura.

show abstract

The copepodid stages ofDrepanopus forcipatus giesbrecht, with notes on the genus and a comparison with other members of the family Clausocalanidae (Copepoda Calanoida)

Cited by 21 publications

References 18 publications

Micro and mesozooplankton composition during winter in Ushuaia and Golondrina Bays (Beagle Channel, Argentina)

Micro and mesozooplankton composition during winter in Ushuaia and Golondrina Bays (Beagle Channel, Argentina)

Pseudocyclops schminkei (Copepoda, Calanoida, Pseudocyclopidae): a new species from Okinawa

FEEDING AND REPRODUCTIVE ACTIVITY OF THE COPEPODS Drepanopus forcipatus AND Calanus australis DURING LATE SUMMER ON THE SOUTHERN PATAGONIAN SHELF (ARGENTINA, 47°-55°S)

Contact Info

Product

Resources

About