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You searched for subject:(scyphomedusae). Showing records 1 – 3 of 3 total matches.

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NSYSU

1. Lai, Chang-yu. Ecological study of the box jellyfish, Carybdea rastonii (Cnidaria: Cubozoa), in the coastal waters of eastern Taiwan.

Degree: Master, Marine Biotechnology and Resources, 2010, NSYSU

This study investigated the ecological characteristics of the box jelly, Carybdea rastonii, in the waters off eastern Taiwan from 2007 to 2009. We started from field net sampling and some basic morphometric analysis to study its population dynamics, and continued with gut-content analysis, digestion rate and respiration rate experiments to estimate on the energy budget of C. rastonii, as well as its ecological significance in this region. We found the spots around the margin of pedelium through all samples, suggesting a stable morphological character of this species. Some specific behaviors were also observed, including the vertical movement after feeding and resting behavior (either lying on the bottom or drifting with the flow) during nighttime. Diagonal bell width (DBW) of C. rastonii was used as the size parameter, ranging from 4.17 to 46.39 mm in the collected samples, and was of significant positive-correlation with volume, wet weight, dry weight, and the length of statolith, suggesting DBW as a good indicator in age-determine. Weekly population structures indicated at least two peaks of strobilation occurring during the sampling period in 2008. Further analysis on the potential impact from environmental perturbation, by comparing the values of DBW with the length of the specimens taken immediately before and after typhoon attack, suggested a potential starvation effect on the local population. Results from gut-content analysis indicated a high percentage of empty guts (63.09%) in the checked specimens, having crustacean as the most dominant prey (up to 68.79%), and a diet shift to more larval fish from larger individuals. Based on the results from gut-content analysis and digestion rates on different types of prey, the estimated population carbon intake of C. rastonii (at 28 ind m-3) was about 20.77 mg m-3 d-1. However, results from respiration rate experiments suggested a higher basic metabolic demand of the box jelly (up to 0.126μmol O2 h-1 mgDW-1, at 27â), which is significantly higher than other scyphomedusae of similar temperature range. According to the need of metabolism, the demand of carbon intake was estimated at 39.40 to 47.77 mg C m-3 d-1, an amount that might be under estimated for this voracious predator. Based on the estimated high values from both feeding and physiological demand, compared to the much lower primary production rate of 7.6 mg C m-3 d-1 in the Kuroshio waters, we concluded that C. rastonii as an important predator in this region, especially during its blooming seasons. Advisors/Committee Members: Wen-Tseng Lo (committee member), Li-Lian Liu (chair), Kwee-Siong Tew (chair), Chang-Tai Shih (chair).

Subjects/Keywords: box jelly; scyphomedusae; pedalium

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lai, C. (2010). Ecological study of the box jellyfish, Carybdea rastonii (Cnidaria: Cubozoa), in the coastal waters of eastern Taiwan. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831110-150258

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Lai, Chang-yu. “Ecological study of the box jellyfish, Carybdea rastonii (Cnidaria: Cubozoa), in the coastal waters of eastern Taiwan.” 2010. Thesis, NSYSU. Accessed November 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831110-150258.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lai, Chang-yu. “Ecological study of the box jellyfish, Carybdea rastonii (Cnidaria: Cubozoa), in the coastal waters of eastern Taiwan.” 2010. Web. 22 Nov 2019.

Vancouver:

Lai C. Ecological study of the box jellyfish, Carybdea rastonii (Cnidaria: Cubozoa), in the coastal waters of eastern Taiwan. [Internet] [Thesis]. NSYSU; 2010. [cited 2019 Nov 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831110-150258.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lai C. Ecological study of the box jellyfish, Carybdea rastonii (Cnidaria: Cubozoa), in the coastal waters of eastern Taiwan. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831110-150258

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of the Western Cape

2. Ras, Verena. Towards an unravelling of the taxonomy of Chrysaora (Scyphozoa; Semaeostomeae; Pelagiidae) from around South Africa .

Degree: 2017, University of the Western Cape

Historically, two species of Chrysaora are known from the Benguela Current Ecosystem: C.fulgida (Reynaud 1830) and C. africana (Vanhöffen 1902). However a third morphotype is now seen, which bears a resemblance to both. Thus a complete qualitative and quantitative analysis of the morphometric and meristic data of these three species was conducted, along with an in depth study into the cnidome as a potential tool of identification. These findings are supplemented by a genetic analysis using cytochrome c oxidase subunit I and internal transcribed spacer 1 gene markers. Three species were unambiguously identified. The genetics and morphology showed considerable divergence, with some of the features used to separate them including: tentacle number and shape, colouration and shape of the oral arm, shape of the gastrovascular pouches and the number and shape of the marginal lappets. Although the mtDNA indicated clear separation of the three Chrysaora, the nucDNA displayed some ambiguity. The cnidome showed considerable divergence and succeeded in separating these species, while the rhopalia of the three species also showed distinct differences in the lengths of the rhopalal canals and basal stems. Much of the confusion surrounding jellyfish taxonomy has been the result of observations made on predominantly preserved specimens that are in subpar quality, a hinderence which this study endeavored to overcome. Advisors/Committee Members: Gibbons, Mark J (advisor), Engelbrecht, Adriaan (advisor).

Subjects/Keywords: Agulhas; Benguela; Nematocysts; Scyphomedusae; Systematics; Chrysaora

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APA (6th Edition):

Ras, V. (2017). Towards an unravelling of the taxonomy of Chrysaora (Scyphozoa; Semaeostomeae; Pelagiidae) from around South Africa . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/5665

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ras, Verena. “Towards an unravelling of the taxonomy of Chrysaora (Scyphozoa; Semaeostomeae; Pelagiidae) from around South Africa .” 2017. Thesis, University of the Western Cape. Accessed November 22, 2019. http://hdl.handle.net/11394/5665.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ras, Verena. “Towards an unravelling of the taxonomy of Chrysaora (Scyphozoa; Semaeostomeae; Pelagiidae) from around South Africa .” 2017. Web. 22 Nov 2019.

Vancouver:

Ras V. Towards an unravelling of the taxonomy of Chrysaora (Scyphozoa; Semaeostomeae; Pelagiidae) from around South Africa . [Internet] [Thesis]. University of the Western Cape; 2017. [cited 2019 Nov 22]. Available from: http://hdl.handle.net/11394/5665.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ras V. Towards an unravelling of the taxonomy of Chrysaora (Scyphozoa; Semaeostomeae; Pelagiidae) from around South Africa . [Thesis]. University of the Western Cape; 2017. Available from: http://hdl.handle.net/11394/5665

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Morandini, André Carrara. Gametogênese e desenvolvimento embrionário de Nausithoe aurea (Scyphozoa, Coronatae) do canal de São Sebastião - SP.

Degree: Mestrado, Zoologia, 1999, University of São Paulo

Nausithoe aurea Silveira & Morandini, 1997 é uma espécie metagenética e dióica com fecundação externa. Os oócitos são liberados continuamente (55 dias em laboratório), porém com grandes variações no número a cada dia. No desenvolvimento embrionário a clivagem, após o estágio de 8 células, passa de holoblástica e igual para pseudoespiral. A gastrulação ocorre por ingressão multipolar e inicia-se aproximadamente 24 horas após a fecundação. A estrutura histológica geral das gônadas assemelha-se a outros Scyphozoa, onde os gonócitos proliferam a partir da gastroderme, migram e diferenciam-se na mesogléia. Na gônada masculina as células germinativas formam camadas razoavelmente distintas e constituem folículos testiculares. Na gônada feminina os oócitos surgem da zona germinativa na gastroderme e apresentam um gradiente de maturação a partir deste ponto (cortes no sentido oral-aboral). Os oócitos encontram-se livres na mesogléia da gônada, sem associação com outras células. A relação espacial entre a musculatura circular, as gônadas e o sulco coronal, é uma característica a ser usada na sistemática do gênero Nausithoe Kölliker, 1853.

Nausithoe aurea Silveira & Morandini, 1997 is a metagenetic and dioecious species with external fertilization. The oocytes are released continuously (55 days in laboratory), but with great variations in the daily number. In the embryonic development the cleavage, after the 8 cells stage, changes from holoblastic and adequal to pseudospiral. The gastrulation occurs through multipolar ingression and begin 24 hours after fertilization. The general histological structure of the gonads resembles other Scyphozoa, in which the gonocytes proliferate from the gastrodermis, migrate and differentiate in the mesoglea. In the male gonad the germ cells are arranged in distinctive layers and form follicles (cysts). In the female gonad the oocytes develop from the germinative zone in the gastrodermis and present a maturing gradient from this point on (oral-aboral sections). The oocytes are free in the gonad mesoglea, without association to any cell. The spatial relation of the coronal musculature, gonads and coronal groove, is a character to be used in the systematics of the genus Nausithoe Kölliker, 1853.

Advisors/Committee Members: Silveira, Fabio Lang da.

Subjects/Keywords: Cnidaria; cnidarian; Coronatae; coronate; desenvolvimento embrionário; embryonic development; gametogênese; gametogenesis; histologia; histology; jellyfish; medusa; Nausithoe; Nausithoe aurea; reprodução de animais marinhos; reproduction of marine animals; Scyphomedusae; Scyphozoa

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Morandini, A. C. (1999). Gametogênese e desenvolvimento embrionário de Nausithoe aurea (Scyphozoa, Coronatae) do canal de São Sebastião - SP. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/41/41133/tde-02042001-102624/ ;

Chicago Manual of Style (16th Edition):

Morandini, André Carrara. “Gametogênese e desenvolvimento embrionário de Nausithoe aurea (Scyphozoa, Coronatae) do canal de São Sebastião - SP.” 1999. Masters Thesis, University of São Paulo. Accessed November 22, 2019. http://www.teses.usp.br/teses/disponiveis/41/41133/tde-02042001-102624/ ;.

MLA Handbook (7th Edition):

Morandini, André Carrara. “Gametogênese e desenvolvimento embrionário de Nausithoe aurea (Scyphozoa, Coronatae) do canal de São Sebastião - SP.” 1999. Web. 22 Nov 2019.

Vancouver:

Morandini AC. Gametogênese e desenvolvimento embrionário de Nausithoe aurea (Scyphozoa, Coronatae) do canal de São Sebastião - SP. [Internet] [Masters thesis]. University of São Paulo; 1999. [cited 2019 Nov 22]. Available from: http://www.teses.usp.br/teses/disponiveis/41/41133/tde-02042001-102624/ ;.

Council of Science Editors:

Morandini AC. Gametogênese e desenvolvimento embrionário de Nausithoe aurea (Scyphozoa, Coronatae) do canal de São Sebastião - SP. [Masters Thesis]. University of São Paulo; 1999. Available from: http://www.teses.usp.br/teses/disponiveis/41/41133/tde-02042001-102624/ ;

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