The biology and morphology of the marine harpacticoid copepod Heteropsyllus nunni Coull, during encystment diapause

1996 ◽  
pp. 179-189
Author(s):  
Judith Williams-Howze
Keyword(s):  
Harpacticoid Copepod

Characterizing population structure of coral-associated fauna from mesophotic and shallow habitats in the Caribbean

2018 ◽  
Vol 99 (3) ◽  
pp. 619-629 ◽  
Author(s):  
Alex J. Veglia ◽  
Nicholas M. Hammerman ◽  
Carlos R. Rivera Rosaly ◽  
Matthew Q. Lucas ◽  
Alexandra Galindo Estronza ◽  
...  
Keyword(s):  
Population Structure ◽  
Puerto Rico ◽  
Marine Invertebrates ◽  
Geographic Distance ◽  
Harpacticoid Copepod ◽  
Coi Gene ◽  
Mitochondrial Coi ◽  
Symbiotic Relationships ◽  
Harpacticoid Copepods ◽  
Obligate Symbiont

Symbiotic relationships are a common phenomenon among marine invertebrates, forming both obligatory and facultative dependencies with their host. Here, we investigate and compare the population structure of two crustacean species associated with both shallow and mesophotic ecosystems: an obligate symbiont barnacle (Ceratoconcha domingensis), of the coral Agaricia lamarcki and a meiobenthic, free-living harpacticoid copepod (Laophontella armata). Molecular analyses of the Cytochrome Oxidase Subunit I (COI) gene revealed no population structure between mesophotic and shallow barnacle populations within south-west Puerto Rico (ΦST = 0.0079, P = 0.33). The absence of population structure was expected due to the pelagic naupliar larvae of the barnacles and the connectivity patterns exhibited by the coral itself within the same region. Laophontella armata exhibited significant structure based on the mitochondrial COI gene between the mesophotic reef ecosystem of El Seco, Puerto Rico and mangrove sediments of Curaçao (ΦST = 0.2804, P = 0.0). The El Seco and Curaçao copepods shared three COI haplotypes despite the obligatory benthic development of harpacticoid copepods and the geographic distance between the two locations. Three other COI haplotypes from El Seco exhibited higher than expected (up to 7%) intra-species variability, potentially representing three new cryptic species of harpacticoid copepods or rare, deeply divergent lineages of L. armata. This result is evidence for the urgent need of a deeper investigation into the meiofauna diversity associated with mesophotic coral ecosystems (MCEs), arguably the most diverse metazoan component of MCEs.

Influence of the Insecticide Diflubenzuron (Dimilin) on the Growth of Marine Diatoms and a Harpacticoid Copepod in Culture

1985 ◽  
Vol 42 (7) ◽  
pp. 1272-1277 ◽  
Author(s):  
N. J. Antia ◽  
P. J. Harrison ◽  
D. S. Sullivan ◽  
T. Bisalputra
Keyword(s):  
Skeletonema Costatum ◽  
Harpacticoid Copepod ◽  
Adult Survival ◽  
Thalassiosira Weissflogii ◽  
Marine Diatoms ◽  
Tigriopus Californicus ◽  
Per Se ◽  
Juvenile Development ◽  
Cyclotella Cryptica ◽  
Injurious Effects

Diflubenzuron (Dimilin) was tested, in the concentration range 0.1–5000 μg∙L−1, for possible injurious effects on the growth and photosynthesis of three chitin-producing (Thalassiosira weissflogii, T. norden-skioldii, Cyclotella cryptica) and one nonchitinaceous (Skeletonema costatum) diatoms. For comparison, the effects of the pesticide were also examined on adult survival and juvenile development of the harpacticoid copepod Tigriopus californicus. While the development of the copepod was hindered at concentrations of the order of 1–10 μg∙L−1, the diatoms were barely affected by Dimilin even at the highest concentration tested (5 mg∙L−1). We conclude that Dimilin acts specifically on insects and crustaceans as a larvicide by interfering with chitin deposition into cuticles during juvenile development through ecdysis. The lack of effect from Dimilin on the chitin-producing diatoms has suggested that the insecticide may not inhibit chitin biosynthesis per se as was previously believed, but that it presumably deregulates one or more of the larval postsynthetic processes responsible for chitin integration into cuticles.

Reproductive behaviour in the harpacticoid copepod Tigriopus fulvus

1994 ◽  
pp. 229-234 ◽  
Author(s):  
I. Lazzaretto ◽  
F. Franco ◽  
B. Battaglia
Keyword(s):  
Harpacticoid Copepod ◽  
Reproductive Behaviour

ESTROGENIC COMPOUNDS AFFECT DEVELOPMENT OF HARPACTICOID COPEPOD TIGRIOPUS JAPONICUS

2003 ◽  
Vol 22 (12) ◽  
pp. 3025 ◽  
Author(s):  
Helen S. Marcial ◽  
Atsushi Hagiwara ◽  
Terry W. Snell
Keyword(s):  
Harpacticoid Copepod ◽  
Estrogenic Compounds ◽  
Tigriopus Japonicus ◽  
Copepod Tigriopus Japonicus

An individual-based modeling approach for evaluation of endpoint sensitivity in harpacticoid copepod life-cycle tests and optimization of test design

2011 ◽  
Vol 30 (10) ◽  
pp. 2353-2362 ◽  
Author(s):  
Thomas G. Preuss ◽  
Markus Brinkmann ◽  
Elin Lundström ◽  
Bengt-Erik Bengtsson ◽  
Magnus Breitholtz
Keyword(s):  
Life Cycle ◽  
Harpacticoid Copepod ◽  
Test Design ◽  
Modeling Approach ◽  
Individual Based Modeling
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