Population differences in the reproductive biology of<i>Evechinus chloroticus</i>(Echinoidea: Echinometridae)

McShane, Paul; Gerring, Peter; Anderson, Owen A.; Stewart, Rob

doi:10.1080/00288330.1996.9516720

Cited by 24 publications

(18 citation statements)

References 11 publications

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“…There is an equal sex ratio, no significant differences in male and female gonad indices, and an annual reproductive cycle (see review : Barker 2001). Similarly, the cellular processes during gametogenesis and high interindividual gametogenic variability are generally consistent with those previously described for E. chloroticus (Dix 1970;Walker 1982;McShane et al 1996;Brewin et al 2000) and other temperate echinoids with an annual gametogenic cycle (Byrne 1990;see review: Pearse & Cameron 1991;Meidel & Scheibling 1998). Timing of gametogenesis was synchronous between males and females at Causet Cove and Espinosa Point.…”

Section: Discussionsupporting

confidence: 64%

Reproduction of the sea urchinEvechinus chloroticus(Echinodermata: Echinoidea) in a New Zealand fiord

Lamare¹,

Brewin

Barker

et al. 2002

New Zealand Journal of Marine and Freshwater Research

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The reproductive cycle of Evechinus chloroticus (Val.) was examined at three (outer, mid, and inner) sites in Doubtful Sound, Fiordland over a 3-year period. We found that sea urchins from all three populations had an annual gametogenic cycle, the timing of which was temporally and spatially consistent. Inter-individual variation in the gametogenic cycle was noted within each population, however, initiation of gametogenesis was generally synchronous among males and females and among sites, occurring in May/June. Strong asynchrony in gamete maturation was observed in Deep Cove, occurring in males 4-5 months earlier than females. Spawning occurred in December at the inner and mid fiord sites, while occurring in January at the outer fiord site. Reproductive potential (maximum gonad index) and output (weight of gametes released/g of animal/year) varied spatially and temporally, where there was a consistent decreasing trend in reproductive potential and output with increasing distance away from the fiord entrance. Spatial variation in reproductive output may be associated, in part, with the strong ecological gradient found in Doubtful Sound, where there is a reported decrease in macrophyte biomass and cover towards the fiord headwaters. The implications of spatial differences in gonad production with respect to the population biology and fisheries management of E. chloroticus in the fiords are discussed.

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Section: Discussionsupporting

confidence: 64%

Reproduction of the sea urchinEvechinus chloroticus(Echinodermata: Echinoidea) in a New Zealand fiord

Lamare¹,

Brewin

Barker

et al. 2002

New Zealand Journal of Marine and Freshwater Research

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“…The consistently low values of the gonadal index in the arms of the fjord indicate low gamete production. Spatial patterns in the per-capita gonad weight are consistent with an energetic influence on both growth and gonad production among study sites (Thompson 1982, Andrew 1986, McShane et al 1996. The sites where sea urchins grow to large sizes have an average per capita gonad weight of 47.86 g, almost 2 and a half times the average of 19.83 g for the other sites.…”

Section: Discussionmentioning

confidence: 55%

Reproductive sources and sinks within a sea urchin, Evechinus chloroticus, population of a New Zealand fjord

Wing¹,

Gibbs²,

Lamare³

2003

Mar. Ecol. Prog. Ser.

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“…Mean ± SE (and range) urchin test diameters and wet weights were 75.6 ± 1.2 mm (57-90 mm) and 93.8 ± 0.5 mm (88-101 mm), and 174.8 ± 7.9 g (69-226 g) and 315 ± 5.6 g (256-393 g) for the small and large size classes, respectively. These size classes represented a compromise between comparing urchins or reasonable size difference whilst being able to collect sufficient numbers of individuals within general reproductive size range (*50-130 mm, McShane et al 1996). Urchins within these size classes were then randomly allocated within two dietary treatments (NIWA and NIFA) as follows:…”

Section: Experimental Animals and Treatmentsmentioning

confidence: 99%

A comparison of the effect of urchin size and diet on gonad yield and quality in the sea urchin Evechinus chloroticus Valenciennes

et al. 2007

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We compared the gonad-enhancing effects of two diets (NIWA and NIFA diets) in two size classes of sea urchins (Evechinus chloroticus): small and large urchins with a test diameter of 75.6 ± 1.2 mm and 93.8 ± 0.5 mm, weighing 174.8 ± 7.9 g and 315 ± 5.6 g, respectively. After eight weeks being fed prepared diets, urchin gonad index (GI) had significantly surpassed that of the initial and final samples of wild urchins. Urchins in the NIWA/small treatment had a larger GI than the NIFA/small and NIFA/large treatments. The NIWA/large treatment had a larger GI than the NIFA/large treatment. The overall percentage increase in GI for the NIWA/small, NIWA/large, NIFA/small and NIFA/large treatments were 183%, 135%, 132% and 85%, respectively. In terms of gonad colour (CIELAB), there were no significant differences in gonad redness (a*) or yellowness (b*) between experimental treatments, but there was a significant difference in gonad lightness (L*) with small urchins fed both diets having lighter-coloured gonads than the large urchins fed both diets. Sensory assessment of gonads revealed that gonads from small urchins fed both diets were rated as being of better colouration and more uniform in colour than gonads from large urchins. Gonads of urchins fed the NIFA diet were rated as being less bitter and of better overall taste than gonads from urchins fed the NIWA diet. This study shows that feeding prepared diets to E. chloroticus can significantly increase gonad yield but that different diets can affect the magnitude of GI increase and the taste of gonads, and that smaller urchins appear more suitable for gonad enhancement.

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Population differences in the reproductive biology ofEvechinus chloroticus(Echinoidea: Echinometridae)

Cited by 24 publications

References 11 publications

Reproduction of the sea urchinEvechinus chloroticus(Echinodermata: Echinoidea) in a New Zealand fiord

Reproduction of the sea urchinEvechinus chloroticus(Echinodermata: Echinoidea) in a New Zealand fiord

Reproductive sources and sinks within a sea urchin, Evechinus chloroticus, population of a New Zealand fjord

A comparison of the effect of urchin size and diet on gonad yield and quality in the sea urchin Evechinus chloroticus Valenciennes

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