Synchronous aggregated pseudo-copulation of the sea star Archaster angulatus Müller & Troschel, 1842 (Echinodermata: Asteroidea) and its reproductive cycle in south-western Australia

  title={Synchronous aggregated pseudo-copulation of the sea star Archaster angulatus M{\"u}ller \& Troschel, 1842 (Echinodermata: Asteroidea) and its reproductive cycle in south-western Australia},
  author={John K. Keesing and Fiona Graham and Tennille R. Irvine and Ryan Crossing},
  journal={Marine Biology},
Mass individual pairing or pseudo-copulation of the sea star Archaster angulatus was observed in November and December 2009, suggesting a late-spring/summer spawning period for this species on the west coast of Australia. Detailed measurements were made on the second of these occasions. Density of sea stars was 1.11 per m2 and 68.5% were in mating pairs. Copulating pairs were mostly male on female, occasionally male on male. There was no difference in size between males and females in mating… 
Size at maturation, sex differences, and pair density during the mating season of the Indo-Pacific beach star Archaster typicus (Echinodermata: Asteroidea) in the Philippines
Mating of the relatively common sea star, Archaster typicus, provides an excellent opportunity to study maturation processes and behavioral differences between males and females, since monomorphism
Selfing in Parvulastra exigua: an asterinid sea star with benthic development
Mixed mating, pseudocopulation during egg laying and developmental success of self-fertilized embryos may contribute to the ecological success of P. exigua and might influence population genetic structure and would facilitate establishment of founder populations by a small number of migrants.
Size distribution of individuals in the population of Asterias amurensis (Echinodermata: Asteroidea) and its reproductive cycle in China
The reproductive characteristics of sea star were most likely affected by the shellfish mariculture in Yantai coastal waters, and the gonad index (GI) and pyloric caeca index (PCI) tended to show a negative relationship.
Population size structure, growth, arm number and damage in the sea star Archaster angulatus Müller and Troschel, 1842 (Echinodermata: Asteroidea)
Abstract Monthly sampling for the sea star Archaster angulatus revealed at least four cohorts with linear growth in the 0+ and 1+ year groups to about 26 months after which growth slows and conforms
Relationships between size and reproductive output in the crown-of-thorns starfish
It is suggested that management targets for maintaining COTS at pre- outbreak thresholds should take account of starfish size as well as starfish density, especially given extreme reproductive potential of large starfish in pre-outbreak populations.
Rate of natural mortality in the sea star Archaster angulatus (Echinodermata: Asteroidea)
  • J. Keesing
  • Environmental Science
    Journal of the Marine Biological Association of the United Kingdom
  • 2017
A. angulatus is intermediate among species which exhibit the extremes of life history strategies, that is, those which grow very rapidly and may live just two years or less and those with very slow growth rates and which may live for decades.
Density and dispersion of Luidia clathrata (Echinodermata: Asteroidea) in Old Tampa Bay
The hypothesis that distribution of L. clathrata in Old Tampa Bay is related to homogeneity of substrate and distribution of prey is supported, as individuals in aquaria in the laboratory showed neither attraction nor repulsion to each other.
The evolution of gonad expenditure and gonadosomatic index (GSI) in male and female broadcast‐spawning invertebrates
It is shown that sedentary broadcast‐spawning marine invertebrates most often have a high GSI that is approximately equal in both sexes, and suggests that higher male GSI may be the prevalent pattern in sperm casters (where only males release gametes).
The Sea Stars ( Echinodermata : Asteroidea ) :
  • Environmental Science
  • 2018
The Sea stars (Asteroidea: Echinodermata) are comprising of a large and diverse groups of sessile marine invertebrates having seven extant orders such as Brisingida, Forcipulatida, Notomyotida,


Mating behaviour and reproductive cycle of Archaster typicus (Echinodermata: Asteroidea)
The reproductive cycle, the mechanism of male-on-female pairing behavior and the spawning behavior of Archaster typicus Müller et Troschel are examined, which leads to simultaneous spawning, increasing the probability of fertilization.
Pairing behaviour, reproduction and diet in the deep-sea holothurian genus Paroriza (Holothurioidea: Synallactidae)
It is hypothesized that pairing increases the likelihood of external fertilization and that spawning in these species may be induced at any time by the presence of a conspecific rather than by seasonal cues.
Seasonal breeding aggregations in low-density populations of the bathyal echinoid Stylocidaris lineata
Data suggest that bathyal cidaroid sea urchins aggregate for reproduction, and the need for reproductive aggregation is evaluated by applying Denny's (1988) model that predicts downstream sperm concentration in a turbulent boundary layer.
Spawning synchrony and aggregative behaviour of cold-water echinoderms during multi-species mass spawnings
Recorded mass spawnings by the sea star Asterias vulgaris and the ophiuroid Ophiopholis aculeata and by these 2 species plus a second ophiura robusta and the sea urchin Strongylocentrotus droebachiensis coincided with the first major intrusion of warm surface water into a region normally dominated by cold upwelling.
Mating behavior of a brooding Antarctic asteroid, Neosmilaster georgianus
Spawning behavior and male-female superposition of Neosmilaster georgianus, a common brooding asteroid, were observed both in the field and the laboratory at Palmer Station, Antarctica, during the austral spring of 1991, marking the first reported instance of aggregative spawning in an Antarctic echinoderm.
Spawning behaviors of northeast Pacific sea cucumbers (Holothuroidea: Echinodermata)
Spawning behaviors observed from May 1981 through August 1983 in the laboratory and field are described and compared for twelve species of northeast Pacific holothuroids collected from waters of the
Costs of extended brood protection in the Antarctic sea star, Neosmilaster georgianus (Echinodermata: Asteroidea)
Energy stores in the pyloric caeca of brooding N. georgianus thus become depleted over a long period of incubation during which the adults apparently starve, which may delay oocyte development and ultimately limit the frequency of individual reproduction.
Reproduction and genetic variation in the deposit-feeding sea star Ctenodiscus crispatus
The gonad index in the deposit-feeding asteroid Ctenodiscus crispatus (Retzius) in the Gulf of Maine (USA) is seasonally less variable than in any other sea star, and varies in concert with, rather than reciprocal to, the pyloric caecum index.
Prespawning Behavior, Spawning, and Development of the Brooding Starfish Leptasterias polaris.
The brooding behavior in L. polaris serves mainly to keep the eggs clean, healthy, and protected against predation, suggesting that the embryos develop at the same rate even when not brooded.
Population characteristics and biology of two populations of Archaster angulatus (Echinodermata: Asteroidea) in different habitats off the central-western Australian coast
Given the abundance of this species in nearshore habitats dominated by sediment, it is likely to be ecologically important, however much of the biology and ecology of the species, even its diet, remain unknown.