Dispersal of echinoderm larvae in a geographical area marked by upwelling (Ligurian Sea, NW Mediterranean)

Pedrotti, ML; Fenaux, Lucienne

doi:10.3354/meps086217

Cited by 59 publications

(22 citation statements)

References 20 publications

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“…Moreover, a second relevant peak of GSI was registered in the LP zone which was demonstrated to be concomitant with a spawning event from June 2013 (Siliani et al, 2016) by histological analysis. This is consistent with observations from other areas of the Mediterranean where one or two annual spawning periods were commonly identified, regardless of the proportion of size classes shaping the population structure (Fenaux, 1968; Semroud & Kada, 1987; Pedrotti & Fenaux, 1992; Pedrotti, 1993; Semroud, 1993; Lozano et al, 1995; Fernandez & Boudouresque, 1997; López et al, 1998; Guettaf, San Martin & Francour, 2000; Leoni et al, 2003; Martínez et al, 2003; Sánchez-España, Martínez-Pita & García, 2004; Tomas, Romero & Turon, 2004; Sellem & Guillou, 2007). …”

Section: Discussionsupporting

confidence: 88%

Hard time to be parents? Sea urchin fishery shifts potential reproductive contribution of population onto the shoulders of the young adults

Loi

Guala

Silva

et al. 2017

PeerJ

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BackgroundIn Sardinia, as in other regions of the Mediterranean Sea, sustainable fisheries of the sea urchin Paracentrotus lividus have become a necessity. At harvesting sites, the systematic removal of large individuals (diameter ≥ 50 mm) seriously compromises the biological and ecological functions of sea urchin populations. Specifically, in this study, we compared the reproductive potential of the populations from Mediterranean coastal areas which have different levels of sea urchin fishing pressure. The areas were located at Su Pallosu Bay, where pressure is high and Tavolara-Punta Coda Cavallo, a marine protected area where sea urchin harvesting is low.MethodsReproductive potential was estimated by calculating the gonadosomatic index (GSI) from June 2013 to May 2014 both for individuals of commercial size (diameter without spines, TD ≥ 50 mm) and the undersized ones with gonads (30 ≤ TD < 40 mm and 40 ≤ TD < 50 mm). Gamete output was calculated for the commercial-size class and the undersized individuals with fertile gonads (40 ≤ TD < 50 mm) in relation to their natural density (gamete output per m2).ResultsThe reproductive potential of populations was slightly different at the beginning of the sampling period but it progressed at different rates with an early spring spawning event in the high-pressure zone and two gamete depositions in early and late spring in the low-pressure zone. For each fertile size class, GSI values changed significantly during the year of our study and between the two zones. Although the multiple spawning events determined a two-fold higher total gamete output of population (popTGO) in the low-pressure zone, the population mean gamete output (popMGO) was similar in the two zones. In the high-pressure zone, the commercial-sized individuals represented approximatively 5% of the population, with almost all the individuals smaller than 60 mm producing an amount of gametes nearly three times lower than the undersized ones. Conversely, the high density of the undersized individuals released a similar amount of gametes to the commercial-size class in the low-pressure zone.DiscussionOverall, the lack of the commercial-size class in the high-pressure zone does not seem to be very alarming for the self-supporting capacity of the population, and the reproductive potential contribution seems to depend more on the total density of fertile sea urchins than on their size. However, since population survival in the high-pressure zone is supported by the high density of undersized sea urchins between 30 and 50 mm, management measures should be addressed to maintain these sizes and to shed light on the source of the larval supply.

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Section: Discussionsupporting

confidence: 88%

Hard time to be parents? Sea urchin fishery shifts potential reproductive contribution of population onto the shoulders of the young adults

Loi

Guala

Silva

et al. 2017

PeerJ

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“…A substantial change would be expected between purely passive particles and larvae swimming directionally, at any swimming speed (Staaterman et al ; Wolanski and Kingsford ). In this region in particular, the dominant Ligurian current flows at 25 cm s −1 on average, with peaks at 50 cm s −1 , and is known to create a barrier to passive coastal particles (Pedrotti and Fenaux ). With virtual larvae swimming between 2.5 and 19 cm s −1 , i.e., often well below the average current speed, it is surprising that there was no influence of the interaction between mesoscale structure and swimming speed on settlement proportion.…”

Section: Discussionmentioning

confidence: 99%

“…a; Stemmann et al ). It creates a marked hydrological front that is believed to act as a barrier to the offshore export of coastal particles (Boucher et al ; Pedrotti and Fenaux ; Goffart et al ).…”

Section: Methodsmentioning

confidence: 99%

Swimming speeds of Mediterranean settlement‐stage fish larvae nuance Hjort's aberrant drift hypothesis

Faillettaz

Durand

Paris

et al. 2017

Limnology & Oceanography

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Irisson. Swimming speeds of Mediterranean settlement-stage fish larvae nuance Hjort's aberrant drift hypothesis. Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2018, 63 (2), pp.509 -523. <10.1002/lno.10643>. This is the accepted version of the following article: Faillettaz, R., E. Durand, C. B. Paris, P. This is the accepted version of the following article: Faillettaz, R., E. Durand, C. B. Paris, P. Koubbi, and J-O. Irisson. 2017. Swimming speeds of Mediterranean fish larvae nuance Hjort's aberrant drift hypothesis. Limnology and Oceanography. doi: 10.1002/lno.10643. 2 Abstract 20Historically, the mortality of early-life stages of marine fishes was supposed to be mostly caused 21 by poor feeding during a critical period and aberrant drifting away from favorable recruitment 22areas. While fish larvae may display remarkable swimming abilities, Hjort's aberrant drift 23hypothesis has rarely been explicitly tested. In this study, we measured critical swimming speed 24 (U crit ) of settlement-stage larvae of six coastal, warm temperate Mediterranean fish species, for 25 which no data was previously available (Sparidae: Boops boops, Diplodus annularis, Spicara 26 smaris, Spondyliosoma cantharus; Pomacentridae: Chromis chromis; Mugilidae sp.). Their 27 swimming speeds were comparable with those of other temperate species, but also with the 28 speeds of tropical species, which are considered as very fast swimmers. Mugilidae were the 29 fastest (29.2 cm s -1 ), followed by Pomacentridae (22.8 cm s -1 ) and Sparidae (11.6 cm s -1 ). Most 30 larvae swam in an inertial regime (Reynolds number > 1000). Those swimming speeds were then 31 implemented in a Lagrangian model of the competency period of these species, set in the same 32 area (the Ligurian Sea) and at the same time (June 2014) as the observations. In this modeling 33 experiment, directional swimming strongly increased the proportion of successful settlers, 34 independent of mesoscale hydrological structures. Fish larvae could settle on the coast from as far 35 as tens of kilometers offshore, in just four days. These findings suggest that aberrant drift is 36 unlikely to occur for strong swimming temperate larvae and show that larval behavior should be 37 considered on equal footing with ocean currents when assessing larval fish dispersal. 38 This is the accepted version of the following article: Faillettaz, R., E. Durand, C. B. Paris, P. Koubbi, and J-O. Irisson. 2017. Swimming speeds of Mediterranean fish larvae nuance Hjort's aberrant drift hypothesis. Limnology and Oceanography.

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“…Direct observations have been possible for a few species with relatively large larvae that disperse over relatively short distances ( Olson, 1985; Davis and Butler, 1989; Carlon and Olson, 1993). Identification of the physical mechanism underlying larval dispersal by sampling larval distributions in the plankton and settlement over space and time concurrently with hydrographic measurements is a second approach ( Pedrotti and Fenaux, 1992; Wing et al ., 1995b ; Miller and Emlet, 1997). Several studies have compared settlement variability over space on a variety of scales from metres to many kilometres ( Caffey, 1985; Rumrill, 1988; Judge et al ., 1988 ; Raimondi, 1990; Gaines and Bertness, 1993; Sewell and Watson, 1993; Wing et al ., 1995a ; Harris and Chester, 1996).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability in red sea urchin (Strongylocentrotus franciscanus) recruitment in northern California

Morgan

Wing

Botsford

et al. 2000

Fisheries Oceanography

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To better understand the spatial distribution of recruitment in the northern California red sea urchin (Strongylocentrotus franciscanus) population, we sampled size distributions at each of 12 locations in 1995 and 1996, two of those locations in 1994, and 5 of those locations in 1997. An index of recent recruitment in these size distributions and an estimate of density of recent recruitment reflect a similar spatial pattern of recruitment. This pattern appears to be determined by the effect of coastal circulation on larval delivery during relaxation of upwelling, and not the result of the positive effect of the adult spine canopy on juvenile survival. Recent recruitment of red sea urchins in northern California is higher in areas more frequently subjected to onshore and poleward flow during relaxation of upwelling. These results are consistent with a mechanism by which alongshore spatial variability in southward, offshore flow during upwelling winds allows larvae to maintain latitudinal position, whereas flows during event‐scale relaxations in upwelling winds serve to distribute settling larvae alongshore, favouring areas north of promontories. The consequent spatial pattern of red sea urchin settlement varies from year to year, and there are not yet sufficient data to demonstrate the degree to which this spatial pattern in recruitment determines a spatial pattern in fishable adult abundance.

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Dispersal of echinoderm larvae in a geographical area marked by upwelling (Ligurian Sea, NW Mediterranean)

Cited by 59 publications

References 20 publications

Hard time to be parents? Sea urchin fishery shifts potential reproductive contribution of population onto the shoulders of the young adults

Hard time to be parents? Sea urchin fishery shifts potential reproductive contribution of population onto the shoulders of the young adults

Swimming speeds of Mediterranean settlement‐stage fish larvae nuance Hjort's aberrant drift hypothesis

Spatial variability in red sea urchin (Strongylocentrotus franciscanus) recruitment in northern California

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