The Life Cycles of two Species of <i>Platychelipus</i> Brady (Harpacticoida) on an Intertidal Mudflat

Barnett, P. R. O.

doi:10.1002/iroh.19700550202

Cited by 24 publications

(24 citation statements)

References 14 publications

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“…Feller (1980b) studied the life history of Huntemannia jadensis in Puget Sound, Washington, where the majority of ovigerous females occurred during approximately the same period of time (December to April). Similar patterns have been observed in high latitude European sites where copepod reproduction occurs in early spring and non-reproductive adults dominate the harpacticoid assemblage during the summer (Barnett 1970, Lasker et al 1970). This phenomenon may not be representat~ve of other meiofaunal taxa in high latitude sites.…”

Section: Harpacticoid Copepodssupporting

confidence: 79%

Seasonal changes in structure of an Alaskan intertidal meiofaunal assemblage

Nv¹,

Tc²

1996

Mar. Ecol. Prog. Ser.

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ABSTRACT. A subarctic, intertidal meiofaunal assemblage in Auke Bay, Alaska, USA, was sampled throughout one year a t 3 intertidal heights; mean low water (0 m) and 1 m above and below this level ( + l m, -1 m). Samples were taken twice a month at 0 m and approximately every other month at -1 and + l m intertidal heights. Nematodes predominated numerically (31 to 77'?0), followed by harpacticoid copepods (adults and copepodites combined 10 to 35%, nauplii 5 to 32%). Meiofaunal densities fluctuated significantly throughout the sampling period. The demography of the 6 numerically predominant species of copepods was examined. In order of abundance, they were Halectinosoma sp., Amphiascoides dirnorphus Lang 1965, Microarthridion cf. littorale Poppe 1881, Apolethon sp., Mesochra sp. and Stenhelia (Stenhelia) pen~culata Lang 1965. Densities of the adults, ovigerous females and copepodites of these species changed significantly throughout time. The peak densities of ovigerous females and copepodites were well separated temporally (whereas those of adults overlapped) and tended to occur in months from November to March. Only M. cf. littorale displayed a high abundance of ovigerous females and copepodites in the summer months. Reproductive patterns vaned among the harpacticoid species, from discrete (Apolethon sp.) to continuous reproductive periodicity (all other species).

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Section: Harpacticoid Copepodssupporting

confidence: 79%

Seasonal changes in structure of an Alaskan intertidal meiofaunal assemblage

Nv¹,

Tc²

1996

Mar. Ecol. Prog. Ser.

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“…g . Barnett, 1970;Lasker et al, 1970;Jewett and Feder, 1977;Fleeger, 1979;Feller, 1980;Palmer, 1980;Soyer, 1980) or on algae (Hicks, 1977). These are permanent environments in contrast to the ephemeral sea ice habitat of the nearshore Beaufort Sea.…”

Section: Discussionmentioning

confidence: 99%

“…These past studies have shown that copepods in permanent environments vary widely in population dynamics and life-history. Barnett (1970) investigated the life cycles of 2 congeneric species inhabiting the same mudflat and found that each species had a distinct life-history. Palmer (1980) observed that different life-history patterns were present in littoral and sublittoral populations of one harpacticoid species.…”

Section: Discussionmentioning

confidence: 99%

The Faunal Assemblage Inhabiting Seasonal Sea Ice in the Nearshore Arctic Ocean with Emphasis on Copepods

Kern¹,

Carey²

1983

Mar. Ecol. Prog. Ser.

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Large numbers of invertebrates were collected from the lower layer of seasonal ice in the nearshore Beaufort Sea, off the northern coast of Alaska in spring 1980. Over 90 % of the individuals found belonged to meiofaunal taxa. Although density within the ice was low compared to that typically found in sediments, it was comparable to the highest previous estimate from sea ice. Densities were lowest in samples taken in April and reached a maximum of around 50 000 individuals m-2 in June. Nematodes were numerically dominant, but copepods and turbellanans were also abundant. Population structures of the 2 most numerous copepod species were examined and found to differ greatly.Cyclopina gracilis appeared to reproduce continuously during the study; both adults and young copepodites were always present. The population of Harpacticus sp. initially consisted only of juveniles; the growth of a single cohort was observed. Harpacticus sp. mated in the ice, but gravid females did not appear during the sampling period. Although the ephemeral seasonal sea ice habitat would seem to be very different from typical habitats of benthic copepods, these 2 species did not appear to possess any special strategies for living there.

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“…Although Harris (1972a) recorded direct high temperature/high population correlations in most of his interstitial copepods, others have recognised pronounced increases in winter, spring, and autumn in other sediment-dwelling species (e.g., Muus 1967, Barnett 1970, Coull 1970. Alga-dwelling copepods show similar variability in the period of maximum abundance (e.g., Ohm 1964, Mukai 1971).…”

Section: Hicks-associations Of Harpacticoidsmentioning

confidence: 99%

“…Quantitative studies based on field data spanning one or more years are few and mainly concern interstitial or epibenthic populations of sand (e.g., Harris 1972 a, b;Mclntyre & Murison 1973), mud (e.g., Barnett 1968Barnett , 1970de Bovee & Soyer 1974), or variable substrates (Fava & Volkmann 1975). Apart from the papers by Mukai (1971) and Pallares & Hall (1974 a, b), few data exist on the seasonal status and associations of alga-dwelling harpacticoid populations.…”

Section: Introductionmentioning

confidence: 99%