scholarly journals Planktonic larvae of the rare spoon worm, Ikedosoma elegans (Annelida: Thalassematidae), collected from Tanabe Bay, Wakayama, Japan

2021 ◽  
Vol 16 (2) ◽  
pp. 149-153
Author(s):  
Keisuke Koizumi ◽  
Tomoyuki Nakano ◽  
Akira Asakura
Keyword(s):  
Planktonic Larvae

Capture of conspecific planktonic larvae by the suspension-feeding gastropod Crepipatella peruviana: association between adult and larval size

2021 ◽  
Vol 87 (1) ◽  
Author(s):  
G A Rivera-Figueroa ◽  
J A Büchner-Miranda ◽  
L P Salas-Yanquin ◽  
J A Montory ◽  
V M Cubillos ◽  
...  
Keyword(s):  
Laboratory Experiments ◽  
Larval Mortality ◽  
Feeding Preference ◽  
The Other ◽  
Suspension Feeding ◽  
Adult Size ◽  
Free Living ◽  
Larval Size ◽  
Suspension Feeders ◽  
Planktonic Larvae

ABSTRACT Free-living, planktonic larvae can be vulnerable to capture and ingestion by adult suspension-feeders. This is particularly the case for larvae that settle gregariously in benthic environments where suspension-feeders occur at high densities. Larvae of gregarious suspension-feeding species are at particularly high risk, as adults of their own species often serve as cues for metamorphosis. We conducted laboratory experiments to assess the extent to which adults of the suspension-feeding caenogastropod Crepipatella peruviana would capture and ingest their own larvae. Experiments were conducted with adults of different sizes, with larvae of different ages and sizes, and in the presence or absence of phytoplankton. Adults captured larvae in all experiments. The presence of microalgae in the water did not influence the extent of larval capture. On average, 39% of larvae were captured during the 3-h feeding periods, regardless of adult size. However, up to 34% of the larvae that were captured on the gill were later discarded as pseudofaeces; the other 64% were ingested. The extent of capture by adults was not related to adult size, or to larval size and, thus, to larval age. Our results suggest that the filtration of congeneric larvae by adult C. peruviana is a result of accidental capture rather than a deliberate feeding preference. Such ingestion could, however, still be an important source of larval mortality, especially when the advanced larvae of this species are searching for a suitable substrate for metamorphosis.

Patiriella pseudoexigua (Asteroidea: Asterinidae): a cryptic species complex revealed by molecular and embryological analyses

2003 ◽  
Vol 83 (5) ◽  
pp. 1109-1116 ◽  
Author(s):  
Michael W. Hart ◽  
Maria Byrne ◽  
Sheri L. Johnson
Keyword(s):  
Dna Sequences ◽  
Original Description ◽  
Sensu Stricto ◽  
Genetic Distances ◽  
New Combination ◽  
Sea Stars ◽  
Planktonic Larva ◽  
Closely Related Species ◽  
Planktonic Larvae ◽  
Cryptic Species Complex

Cryptic lineages were identified within a morphologically uniform group of sea stars distributed from Australia to Japan. Among eight populations, all of which have been referred to Patiriella pseudoexigua, we found seven unique mitochondrial DNA sequences clustered into four distinct lineages. These four lineages formed a monophyletic group in which sister clades were separated by small genetic distances but could be differentiated from each other on the basis of reproductive differences. The four lineages thus appear to be separate but very closely related species. Examination of reproduction in several Queensland populations revealed that one population (Statue Bay) consisted of hermaphroditic intragonadal brooders with live-born offspring while other populations (Townsville, Bowen, Airlie Beach) consisted of dioecious free-spawners with a planktonic larva. The brooded larvae from central Queensland populations closely resembled brooded embryos and larvae of a Japanese lineage, while the planktonic larvae from northern Queensland were similar to the original description of planktonic larvae from a Taiwan population. However, each of the viviparous lineages was more closely related to a lineage with planktonic larval development than the viviparous lineages were to each other. Patiriella pseudoexigua thus comprises at least four species with different reproductive phenotypes in which viviparous brooding appears to have evolved in parallel. Based on previous taxonomic work we propose the following names for these four lineages: the dioecious free-spawner from northern Queensland (including the P. pseudoexigua type locality) is P. pseudoexiguasensu stricto; the viviparous brooder from central Queensland is undescribed and here referred to as Patiriella sp. nov; the dioecious free-spawner from Taiwan is temporarily referred to as Patiriella sp. (a senior name for this species may be P. pentagonus); and the hermaphrodite brooder from Japan should be raised to specific status and referred to by the new combination P. pacifica.

Occurrence ofGlugea pimephalesin Planktonic Larvae of Fathead Minnow in Algonquin Park, Ontario

2009 ◽  
Vol 21 (3) ◽  
pp. 164-166
Author(s):  
Jonathon J. H. Forest ◽  
Stanley D. King ◽  
David K. Cone
Keyword(s):  
Fathead Minnow ◽  
Planktonic Larvae

scholarly journals Abundance and instantaneous transport of Petrolisthes armatus (Gibbes, 1850) planktonic larvae in the Catuama inlet, Northeast Brazil

2012 ◽  
Vol 84 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Mauro de Melo Júnior ◽  
Ralf Schwamborn ◽  
Sigrid Neumann-Leitão ◽  
Maryse N. Paranaguá
Keyword(s):  
Northeast Brazil ◽  
Planktonic Larvae ◽  
Petrolisthes Armatus

scholarly journals Adaptive specialization and constraint in morphological defences of planktonic larvae

2019 ◽  
Vol 34 (1) ◽  
pp. 217-228 ◽  
Author(s):  
Samuel M. Bashevkin ◽  
John H. Christy ◽  
Steven G. Morgan
Keyword(s):  
Morphological Defences ◽  
Planktonic Larvae ◽  
Adaptive Specialization

Successful sexual reproduction of the scleractinian coralPorites panamensis: Evidence of planktonic larvae and recruitment

2019 ◽  
Vol 138 (1) ◽  
pp. 29-39 ◽  
Author(s):  
Jeimy D. Santiago‐Valentín ◽  
Alma P. Rodríguez‐Troncoso ◽  
Eric Bautista‐Guerrero ◽  
Andrés López‐Pérez ◽  
Amilcar L. Cupul‐Magaña
Keyword(s):  
Sexual Reproduction ◽  
Planktonic Larvae
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