Environmental drivers of small scale spatial variation in the reproductive schedule of a commercially important bivalve mollusc

Hold, Natalie; Murray, Lee G.; Hinz, Hilmar; Neill, Simon P.; Lass, Sarah; Lo, Mandy; Kaiser, Michel J.

doi:10.1016/j.marenvres.2013.09.011

Cited by 10 publications

(12 citation statements)

References 25 publications

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“…It is likely that the animals at these sites are nutritionally advantaged and therefore complete gametogenesis and spawning earlier. This suggestion would be consistent with observations in bivalves that intra-specific variation in reproductive cycles can be related to small-scale food supply patterns (Hold et al 2013). Salinity fluctuations can also induce spawning in bivalves (Sastry 1979), and it is equally plausible individuals at sites A and B experience fluctuations in salinity associated with freshwater output from the estuary that could induce spawning episodes.…”

Section: Spatial and Temporal Variationsupporting

confidence: 88%

“…Spatial differences in bivalve reproduction at relatively small scales can be marked (Gosling 2004). Pecten maximus populations around coastal Isle of Man, for example, showed significant variation in gonad condition, fecundity and spawning onset at small horizontal scales of < 5 km (Hold et al 2013), whilst intertidal bivalves can vary reproductively across tidal heights within a population (Harvey & Vincent 1989;Azouzi et al 2002).…”

Section: Spatial and Temporal Variationmentioning

confidence: 99%

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Spatial variation in reproduction in southern populations of the New Zealand bivalvePaphies ventricosa(Veneroida: Mesodesmatidae)

Gadomski

Lamare

2015

Invertebrate Reproduction & Development

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Paphies ventricosa is a large surf clam endemic to New Zealand, and whose populations have substantially declined during the past century owing to overfishing and habitat degradation. Poor recruitment is now evident, and therefore, understanding the reproductive patterns of P. ventricosa is a key to developing and implementing conservation strategies for the species. This study examines the reproductive cycle of P. ventricosa over one year in a population at Oreti Beach, Southland, the southernmost known extent of the species. At the same beach, we quantify spatial variation in reproduction among four sites using quarterly surveys. Reproductive status is quantified from body indices and histological examination of gonads. Based on changes in oocyte sizes, gametogenic stages and condition index, we observed a species with a primary spawning in spring and a second spawning event in autumn, with no resting phase but minimal reproductive activity over winter. Seasonal reproduction corresponded with warmer sea surface temperature and a peak in chlorophyll-a concentrations in the region. Small-scale (<15 km) variation in the timing of spawning was also evident along Oreti Beach, and these patterns maybe an important consideration when identifying areas that may be considered for conserving source populations.

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Section: Spatial and Temporal Variationsupporting

confidence: 88%

Section: Spatial and Temporal Variationmentioning

confidence: 99%

Spatial variation in reproduction in southern populations of the New Zealand bivalvePaphies ventricosa(Veneroida: Mesodesmatidae)

Gadomski

Lamare

2015

Invertebrate Reproduction & Development

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“…The reproduction of molluscan bivalves has been closely studied in the past decades to support management decisions (Byrne 1998, Beasley et al 2000, Hold et al 2013, pest control (Ram et al 1996), and to enhance aquaculture farming (Joaquim et al 2008). Past studies mostly attempted to establish methods for spawn induction (Gibbons & Castagna 1984, V elez et al 1990, Mies & Sumida 2012, Navneel & Azam 2013, to characterize gamete release and spawning behavior (Jameson 1976, Marteil 1976, Andr e & Lindegarth 1995, to evidence seasonality in reproductive competence (e.g., Marteil 1960, Grant & Tyler 1983, Beasley et al 2000, Pouvreau et al 2000, and to identify potential high reproductive areas (Williams & Babcok 2010, Hold et al 2013.…”

Section: Introductionmentioning

confidence: 99%

“…Gonad maturation can be used as a proxy of reproductive activity. Specifically, monitoring the ratio of immature versus ripe and spent gonads provides useful information on the spawning season (Ram et al 1996, Beasley et al 2000, whereas spatially structured sampling may help in the detection of reproductive success differences among sites and habitats (Hold et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The simplest proxy of gonad maturation is the gonadosomatic index (GSI), usually defined as the ratio between gonad weight and flesh biomass (Shelley & Southgate 1988, Pouvreau et al 2000, Gagn e et al 2003. Shell height can also be used instead of flesh biomass (Williams & Babcok 2010, Hold et al 2013. The GSI assumes that the weight of ripe gonads is greater than immature and spent gonads.…”

Section: Introductionmentioning

confidence: 99%

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Identifying Robust Proxies of Gonad Maturation for the Protandrous HermaphroditeTridacna maxima(Röding, 1798, Bivalvia) from Individual to Population Scale

Menoud

Wynsberge

Moullac

et al. 2016

Journal of Shellfish Research

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Monitoring gonad maturation for protandrous and functional hermaphrodite species such as the giant clam Tridacna maxima is difficult due to the juxtaposition and relative proportion of male and female tissues in the gonad [gonadal sex ratio (GSR)].Here, the relevance of the widely used gonadosomatic index (GSI) as proxy of giant clam gonad maturation is tested with a large dataset (n ¼ 265). Gonadosomatic index is compared with other indices, namely the proportion of the male part harboring spermatozoids, the proportion of empty oocyte follicles, the mean oocyte diameter, and the oocyte elongation. At gonad scale, high index variability highlighted partial spawning. At individual scale, male and female maturation proxies were contrasted, showing either asynchronous emissions of male and female gametes or contrasted spermatogenesis and oogenesis duration. The GSI was mostly driven by the number and diameter of oocytes and therefore it is recommended here as primary proxy for female maturity. Except for the oocyte elongation, all indices were affected by the GSR, which ruled out drawing conclusions at population scale. These results highlight the need for maturation stage proxies that are optimized for functional hermaphrodite species.

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Influences of habitat and seasonal changes on gonadal maturation of Echinometra mathaei (Echinodermata: Echinoidea) and Tridacna squamosa (Mollusca: Bivalvia) in the Red Sea, Egypt

El-Sokkary,

El-Wakeil,

Obuid-Allah

et al. 2023

Environ Monit Assess

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The present work is aimed at investigating the effects of seasonal changes and habitat conditions on reproductive state and gonadal development of two macrobenthic fauna. Echinometra mathaei and Tridacna squamosa were collected seasonally (summer and winter) in July 2019 and January 2020 from three sites along the Red Sea coast, Egypt: Hamraween, Sedy Malek, and Porto Ghalb. Sexual differences and gonadal maturation in the two species were determined by performing biopsies of their gonads followed by morphologic analyses. Hematoxylin and eosin–stained gonadal sections were examined and analyzed. In E. mathaei, reproductive behavior was more active in the summer than in the winter; in T. squamosa, reproductive behavior was active almost all the year, especially during the winter. The reproductive activity and gonadal maturation of both species were affected by environmental factors. The results indicated that temperature is a vital factor affecting the reproductive activity of both species. This study concluded that temperature fluctuations may pose significant challenges to coastal marine ecosystems.

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Environmental drivers of small scale spatial variation in the reproductive schedule of a commercially important bivalve mollusc

Cited by 10 publications

References 25 publications

Spatial variation in reproduction in southern populations of the New Zealand bivalvePaphies ventricosa(Veneroida: Mesodesmatidae)

Spatial variation in reproduction in southern populations of the New Zealand bivalvePaphies ventricosa(Veneroida: Mesodesmatidae)

Identifying Robust Proxies of Gonad Maturation for the Protandrous HermaphroditeTridacna maxima(Röding, 1798, Bivalvia) from Individual to Population Scale

Influences of habitat and seasonal changes on gonadal maturation of Echinometra mathaei (Echinodermata: Echinoidea) and Tridacna squamosa (Mollusca: Bivalvia) in the Red Sea, Egypt

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