Microdistribution of the marine copepodOithona davisae in the shallow waters of Ariake-kai mud flats, Japan

Hirota, Reiichiro

doi:10.1007/bf01344300

Cited by 18 publications

(16 citation statements)

References 5 publications

(11 reference statements)

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“…In an evolutionary context, it is surprising that the neritic O. davisae, which typically occurs in very high abundances in estuaries and inlets (Nishida 1985;Hirota 1990; Fig. 10), has developed such strong mate-searching skills and such poor mating capacity.…”

Section: Discussionmentioning

confidence: 99%

Mate finding, mating, and population dynamics in a planktonic copepod Oithona davisae: There are too few males

Kiørboe

2007

Limnology & Oceanography

102

108

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Three-dimensional (3D) video observations of free-swimming copepods revealed the mechanisms of mate finding in the cyclopoid copepod Oithona davisae (cephalothorax length 0.33 mm). The females are ambush feeders and spend almost all of their time sinking slowly through the water, interrupted by 0.5-1-mm-long jumps every few seconds. The sink-jump behavior distributes produced pheromones along an intermittent trail. Males spend about half of their time ambush feeding, and half of their time cruising rapidly (50 body lengths s 21 ), searching for female signals. On encountering a pheromone patch, the male starts circling rapidly (up to .100 body lengths s 21 ) around the patch, apparently to find subsequent patches and, eventually, the female. The pursuit may last several tens of seconds, and ends by the male capturing the female or losing the track. Observed reaction distances and male motility patterns were combined with a simple encounter model to estimate a matesearch volume rate of 4.4 L d 21 . The males have a rather limited mating capacity, 0.9 females male 21 d 21 , even when mate-encounter rate is not limiting. Field observations of abundances, combined with estimates of mortality and mate-search and mating capacities, predict that only approximately one-third of the females should be fertilized. This is consistent with field observations, and suggests that population growth in this species is severely constrained by fertilization limitation. Fertilization limitation may apply more generally to populations of pelagic copepods, and may partly account for the frequent observation that female copepods produce sterile eggs, even during periods of a plentiful food supply.

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Section: Discussionmentioning

confidence: 99%

Mate finding, mating, and population dynamics in a planktonic copepod Oithona davisae: There are too few males

Kiørboe

2007

Limnology & Oceanography

102

108

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“…The former is distributed in the coastal waters of southwestern Japan (Nishida 1985) and in the Sacramento-San Joaquin estuary, California, USA (Ferrari & Orsi 1984). It often comprises the most abundant copepod in eutrophic embayments such as in Tokyo Bay (Nagasawa & Marumo 1984, Uye 1994, Hiroshima Bay (Uye et al 1992) and Ariake Bay (Hirota & Tanaka 1985, Hirota 1990). The latter species occurs very widely from temperate to polar seas, even in oligotrophic oceanic waters (Shuvalov 1975, Fransz & Gonzalez 1995.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in biomass, growth rate and production rate of the small cyclopoid copepod Oithona davisae in a temperate eutrophic inlet

Uye¹,

Sano²

1998

Mar. Ecol. Prog. Ser.

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We investigated the seasonal variations in biomass, somatic growth rate and productlon rate of the small cyclopoid copepod Oithona davisae in Fukuyama Harbor, a eutrophic inlet of the Inland Sea of Japan. The carbon biomass of the population, excluding nauplii, was lowest in early spring and increased exponentially in early summer to a maximum of 92.2 mg m-%n mid-June. Thereafter, it was relatively high, except for a mid-summer decline, until fall. The speclfic growth rates of naupliar and copepodite stages were estimated from their body weight increments and stage durations, assuming that In this highly eutrophic inlet growth IS food-satiated for this species. They increased exponentially with increasing temperature, ranging from 0.088 to 0.357 d-' for nauplii and from 0.060 to 0.446 d-' for copepodites within the annual temperature range of 8.9 to 28.ZDC. The production rate as a sum of somatic growth rate of copepodltes and egg production rate of adult females varied sirnlarly to, but showed a wlder range than, the biomass vanation. Annual integrated carbon productlon was 650 rng m-3 yr-l, or 4.88 g m-2 yr-'. 94 % of which was attained between June and October. Of the production, copepodite somatic growth and female egg production comprised 75 and 25 %, respectively. 0. davisae contributed 26% of the annual copepod community production in Fukuyama Harbor.

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“…Swarming was also observed for Labidocera pavo at 0.5 -1 m above the bottom with a disc shape of 10 -20 cm in diameter (Ueda et al, 1983). A number of other temperate species are also known to aggregate, although the sites of swarming seem to be different depending on the species and time of day (Anraku, 1975;Ueda et al, 1983;Hirota, 1990).…”

Section: Nocturnal Emergence In Subtropical Arthropodsmentioning

confidence: 90%

Emergence Rhythms of Subtidal Small Invertebrates in the Subtropical Sea: Nocturnal Patterns and Variety in the Synchrony with Tidal and Lunar Cycles

Saigusa

Oishi

2000

Zoological Science

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Microdistribution of the marine copepodOithona davisae in the shallow waters of Ariake-kai mud flats, Japan

Cited by 18 publications

References 5 publications

Mate finding, mating, and population dynamics in a planktonic copepod Oithona davisae: There are too few males

Mate finding, mating, and population dynamics in a planktonic copepod Oithona davisae: There are too few males

Seasonal variations in biomass, growth rate and production rate of the small cyclopoid copepod Oithona davisae in a temperate eutrophic inlet

Emergence Rhythms of Subtidal Small Invertebrates in the Subtropical Sea: Nocturnal Patterns and Variety in the Synchrony with Tidal and Lunar Cycles

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