On natural metamorphosis inducers of the cnidarians Hydractinia echinata (Hydrozoa) and Aurelia aurita (Scyphozoa)
نویسندگان
چکیده
منابع مشابه
Molecular evidence for cryptic species of Aurelia aurita (Cnidaria, Scyphozoa).
Morphological taxonomy suggests that marine faunas are species poor compared to terrestrial and freshwater faunas (1). This dichotomy has been attributed to the unique potential of marine plankters for distant dispersal across homogenous oceans with few barriers to gene flow (2). The relative scarcity of opportunities for allopatric divergence has resulted in depauperate marine faunas character...
متن کاملMetamorphosis of Hydractinia echinata (Cnidaria) is caspase-dependent.
Apoptotic cell death plays an important role in many developmental pathways in multicellular animals. Here, we show that metamorphosis in the basal invertebrate Hydractinia echinata (Cnidaria) depends on the activity of caspases, the central enzymes in apoptosis. Caspases are activated during metamorphosis and this activity can be measured with caspase-3 specific fluorogenic substrates. In affi...
متن کاملCell proliferation and early differentiation during embryonic development and metamorphosis of Hydractinia echinata.
The early embryonic development of Hydractinia lasts about 2.5 days until the developing planula larva acquires competence for metamorphosis. Most embryonic cells stop cycling on reaching the larval stage. In older larvae of Hydractinia, cells that are still proliferating occur exclusively in the endoderm in a typical distribution along the longitudinal axis. During metamorphosis, proliferation...
متن کاملInduction of segmentation in polyps of Aurelia aurita (Scyphozoa, Cnidaria) into medusae and formation of mirror-image medusa anlagen.
Polyps of Aurelia aurita can transform into several medusae (jellyfish) in a process of sequential subdivision. During this transformation, two processes take place which are well known to play a key role in the formation of various higher metazoa: segmentation and metamorphosis. In order to compare these processes in bilaterians and cnidarians we studied the control and the kinetics of these p...
متن کاملThe transcriptome of the colonial marine hydroid Hydractinia echinata.
An increasing amount of expressed sequence tag (EST) and genomic data, predominantly for the cnidarians Acropora, Hydra and Nematostella, reveals that cnidarians have a high genomic complexity, despite being one of the morphologically simplest multicellular animals. Considering the diversity of cnidarians, we performed an EST project on the hydroid Hydractinia echinata, to contribute towards a ...
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ژورنال
عنوان ژورنال: Helgoland Marine Research
سال: 1999
ISSN: 1438-387X,1438-3888
DOI: 10.1007/s101520050014