Development time of harpacticoid copepods: some empirical models and implications

1999 ◽  
Vol 79 (6) ◽  
pp. 1123-1124 ◽  
Author(s):  
P.J.P. Santos ◽  
J. Castel ◽  
L.P. Souza-Santos
Keyword(s):  
Body Length ◽  
Development Time ◽  
Environmental Temperature ◽  
Harpacticoid Copepod ◽  
Empirical Models ◽  
Copepod Species ◽  
Egg Development ◽  
Rearing Temperature ◽  
Development Times ◽  
Harpacticoid Copepods

Some meiobenthic harpacticoid copepod species cannot be successfully cultured, therefore empirical models were developed to estimate their development times, using literature data, but taking into consideration several empirical rules previously formulated to model the development of planktonic copepods. The present models demonstrated the overwhelming influence of rearing temperature on egg development time, and of body length on total development time and indicate a capacity to adapt development rates to environmental temperature.

Empirical analysis of the effect of temperature on marine harpacticoid copepod development time

1988 ◽  
Vol 66 (6) ◽  
pp. 1376-1381 ◽  
Author(s):  
Donald G. Webb ◽  
Timothy R. Parsons
Keyword(s):  
Development Time ◽  
Environmental Temperature ◽  
Harpacticoid Copepod ◽  
Effect Of Temperature ◽  
Data Set ◽  
Predictive Equations ◽  
Harpacticoid Copepods ◽  
Power Curves ◽  
Juvenile Development ◽  
Copepod Development

Predictive equations to estimate development time from environmental temperature for marine harpacticoid copepods were developed from data extracted from the literature. Separate equations were constructed for egg, nauplius, copepodite, and total juvenile development, as well as for generation time. Power curves adequately described the data and each regression was significant (P < 0.001). Approximately 50% of the variance in each data set was explained by regression on temperature. Predictions of development time generally were precise, with the upper 95% confidence limit 39–65% greater than the prediction at low temperatures (4–5 °C), 7–13% greater at mean temperatures (17.6–19.3 °C), and 13–31% greater at high temperatures (28–40 °C). Application of these predictive equations will facilitate analysis of the population dynamics and production of marine harpacticoid copepods.

Description of the life-history stages of Amphiascus undosus Lang (Copepoda, Harpacticoida)

1991 ◽  
Vol 69 (2) ◽  
pp. 512-527 ◽  
Author(s):  
Graham J. McMillan
Keyword(s):  
Adult Development ◽  
Development Time ◽  
Harpacticoid Copepod ◽  
Original Description ◽  
Sexually Dimorphic ◽  
Single Female ◽  
Type Specimens ◽  
Life History Stages ◽  
Harpacticoid Copepods ◽  
Similarities And Differences

The six naupliar and six copepodite stages of the harpacticoid copepod Amphiascus undosus Lang are described in detail. Thoracic leg segmentation and armature are presented in tabular form for the copepodite stages. The species becomes sexually dimorphic at the fourth copepodite stage. Average egg-to-adult development time is approximately 31.5 days at 22 ± 1 °C. Up to four successive pairs of egg sacs from a single female are produced in the laboratory, yielding a maximum of 76 progeny. Some discrepancies exist between the original description of the California type specimens and the present British Columbia material, particularly in the adult male maxillule, maxilliped, and first, fifth, and sixth legs, and the caudal setae of the adult female. A brief comparison is made with the developmental similarities and differences of six other diosaccid harpacticoid copepods.

scholarly journals Report on five species of harpacticoid copepods from vegetative area of Sungai Pulai, Johor

2018 ◽  
Vol 14 (2) ◽  
pp. 284-288
Author(s):  
Zaleha Kassim ◽  
Hazwani Hanim Hasnan ◽  
Syazleen Zainal ◽  
Nurul Huda Ahmad Ishak
Keyword(s):  
Fish Larvae ◽  
Marine Ecosystem ◽  
Harpacticoid Copepod ◽  
Copepod Species ◽  
Taxonomic Study ◽  
Body Parts ◽  
Seagrass Bed ◽  
Preferred Habitat ◽  
Sea Bottom ◽  
Harpacticoid Copepods

Bottom vegetation is known as preferred habitat for many types of meiofauna such as copepods. The conditions of sea bottom that include vegetation could contribute to the copepod’s assemblage. Being an important diet for fish larvae, information on copepod species promotes effort for conservation of both fish species and marine ecosystem. Nonetheless, identification and taxonomic report on copepods from such areas are still scanty. Samples of copepods were collected by scrapping the uppermost 10cm of sediment of bottom area at Sungai Pulai’s seagrass-bed during low tide. Sediment was decanted to extract the copepods which later be preserved in 5% buffered formalin.  Body parts were dissected under microscope and prepared for taxonomic study. All drawings made with the help of Lucida tube were used for comparison with established key of identification. Five families were noted in this study; Ameridae Monard, Lang, Parastenhelia Thompson & A. Scott, Dactylopusiidae Lang, Tisbidae Sars and Diosaccidae Sars. Harpacticoid copepod species described from this study were Ameira sp. (Ameridae Monard, Lang), Parastenhelia sp. (Parastenhelia Thompson & A. Scott), Paradactylopodia sp. (Dactylopusiidae, Lang), Idyanthepusilla (Tisbidae, Sars) and Stenhelia sp. (Diosaccidae Sars).  Further study on functional morphology would explain their adaptability to both conditions of sea bottom.

scholarly journals Environmental temperature during early life affects the personality of mosquitofish in adulthood

2021 ◽  
Author(s):  
Haifeng Li ◽  
Xinyu ZHang ◽  
Yi Wu ◽  
Feng ZHang ◽  
CHunlin Li
Keyword(s):  
Body Length ◽  
High Temperatures ◽  
Low Temperatures ◽  
Early Life ◽  
Environmental Temperature ◽  
Phenotypic Trait ◽  
Behavioral Syndrome ◽  
Growing Up ◽  
Female Fish ◽  
Behavioral Traits

Abstract Personality has been observed in a variety of animal taxa with important implications in ecology and evolution. Exploring the influence of environmental temperature during early life on personality could help to understand the ontogeny of this phenotypic trait in animals. In this study, we reared newborn mosquitofish Gambusia affinis at high (30°C) and low (25°C) water temperatures and measured their shyness and exploration upon sexual maturity. We tested the repeatability of each behavioral trait; the correlation between them; and the effects of rearing temperature, sex, and body length on the behaviors. When growing up at low temperatures, female fish exhibited repeatability in shyness and exploration, and males exhibited marginal repeatability in shyness. However, neither of the 2 behaviors were repeatable when the fish were reared at high temperatures. There was a negative correlation between shyness and exploration, indicating that the 2 behaviors comprise a behavioral syndrome in this species. Mosquitofish reared at high temperatures were more explorative than those reared at low temperatures, while there was no difference in shyness between the 2 treatments. Body length and sex had no significant effects on the average values of the 2 behaviors. The results indicate that environmental temperature during early life could shape the personality of mosquitofish and modify the average of the behavioral traits. These findings might provide insights to understand the ontogeny of animal personality and how changes in environmental temperature influence animal dispersal by shaping their personality.

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.

Laboratory observations on early development of the oncaeid copepod Triconia canadensis from the mesopelagic zone of the western subarctic Pacific

2007 ◽  
Vol 87 (2) ◽  
pp. 479-482 ◽  
Author(s):  
Yuichiro Nishibe ◽  
Tsutomu Ikeda
Keyword(s):  
Lipid Droplets ◽  
Development Time ◽  
Hatching Success ◽  
Egg Development ◽  
Egg Hatching ◽  
Subarctic Pacific ◽  
Western Subarctic Pacific ◽  
Mesopelagic Zone ◽  
Life Cycle Strategy

Egg development time and hatching success were determined for the oncaeid copepod, Triconia canadensis, from the mesopelagic zone of the western subarctic Pacific. The egg development time was estimated to be 74.7–84.5 days at in situ temperature (3°C), which is much longer than those reported previously on the other oncaeid copepods even if the differences in experimental temperatures are taken into account. The egg hatching success varied between 50 and 100%, with a grand mean of 88%. The newly hatched nauplii of T. canadensis were elongate ellipsoid in shape, and had many large-sized lipid droplets in their body. Possible adaptive significance of apparent longer egg developmment time of T. canadensis is discussed in the light of their life cycle strategy.

scholarly journals Harpacticoid copepod colonization of coral fragments in a tropical reef lagoon (Zanzibar, Tanzania)

2011 ◽  
Vol 92 (7) ◽  
pp. 1535-1545 ◽  
Author(s):  
M. Callens ◽  
H. Gheerardyn ◽  
S.G.M. Ndaro ◽  
M. De Troch ◽  
A. Vanreusel
Keyword(s):  
Life Style ◽  
Temporal Dynamics ◽  
Substrate Surface ◽  
Harpacticoid Copepod ◽  
Dominant Group ◽  
Dead Coral ◽  
Tropical Lagoon ◽  
Harpacticoid Copepods ◽  
Tropical Reef ◽  
Colonization Rates

Colonization experiments were conducted in a tropical lagoon (Zanzibar Island, off the coast of Tanzania) to investigate the temporal dynamics and mode of colonization of the harpacticoid copepods community on dead coral fragments. There was fast colonization of the coral fragments attaining a substantial diversity after only two days. The ability to colonize dead coral fragments is thought to be related to the morphology and life style of different harpacticoid species. Phytal taxa (e.g. Tisbidae) were fast colonizers, reaching high abundances during the initial colonization phase. Sediment-associated and eurytopic taxa (e.g. Ameiridae, Miraciidae and Ectinosomatidae) showed lower colonization rates and became the dominant group during the later colonization phase. Most species are able to colonize the coral fragments through the water column. However, colonization along the substrate surface is also considered to be an important colonization mode, especially for sediment-associated taxa, which showed lower colonization rates when migration through the sediment was hindered.

WEIGHT AND DEVELOPMENT TIME OF DIFFERENT STADIA OF MOSQUITOES REARED AT VARIOUS CONSTANT TEMPERATURES

1967 ◽  
Vol 99 (9) ◽  
pp. 986-993 ◽  
Author(s):  
R. A. Brust
Keyword(s):  
Weight Gain ◽  
Development Time ◽  
Adult Stage ◽  
Larval Instar ◽  
Dry Weight ◽  
Specific Weight ◽  
Fourth Instar ◽  
Rearing Temperature ◽  
Males And Females ◽  
Culiseta Inornata

AbstractDevelopment time decreased with each increase in rearing temperature in Aedes vexans, A. nigromaculis, and Culiseta inornata until the optimum survival temperature was reached. The optimum survival temperature for A. vexans was 26.5 °C, for A. nigromaculis 21 °C, and for C. inornata 21 °C. Dry weight gain per hour in female larvae was greater than in male larvae in all three species, at all temperatures. There was a significant reduction in weight in each larval instar, pupal, and adult stage, with each 5.5 °C increase in rearing temperature. Times to larval–pupal ecdysis and pupal–adult ecdysis were the same for males and females of A. nigromaculis at all developmental temperatures tested. Time to larval–pupal ecdysis and pupal–adult ecdysis in A. vexans and C. inornata occurred 1 to several days later in females, depending upon the developmental temperature. In all three species the duration of the fourth instar was longest and the specific weight gain greatest.

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