Interactions Between Behaviour and Physical Forcing in the Control of Horizontal Transport of Decapod Crustacean Larvae

Queiroga, Henrique; Blanton, Jackson O.

doi:10.1016/s0065-2881(04)47002-3

Cited by 254 publications

(295 citation statements)

References 209 publications

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“…Relaxation of upwelling causes translocation of the larvae to the near-shore environment; supply into estuaries then occurs by selective tidal stream transport (for example, Queiroga et al, 2006). Available laboratory and field studies indicate that pulses of decapod larvae of the same age react coherently to environmental stimuli (Queiroga and Blanton, 2005). This supports the view that larvae resulting from the same hatching event are subjected to essentially the same advection history.…”

Section: Introductionmentioning

confidence: 81%

“…We would expect a reduction of genetic diversity within larvae arriving at a given location relative to the adult source populations if only a small proportion of adult crabs contribute to reproduction at each spawning event. We would also expect genetic differences between temporally distinct larval supply episodes given that the mechanisms of larval dispersal and recruitment over time are strongly dependent on the interactions between larvae and variable aspects of wind-, tidal-and density-driven circulations (Queiroga and Blanton, 2005). For example, Hedgecock et al (2007b) reported genetic divergence at four microsatellite loci between recruited juveniles and adults of the European flat oyster Ostrea edulis from western Mediterranean despite the genetic homogeneity observed among the adult populations.…”

Section: Discussionmentioning

confidence: 99%

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Temporal genetic homogeneity among shore crab (Carcinus maenas) larval events supplied to an estuarine system on the Portuguese northwest coast

et al. 2010

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Despite the importance of larval biology in the life histories of many marine animals, relatively little information exists on the dynamics and genetic composition of larval cohorts. The supply of megalopae larvae of the shore crab, Carcinus maenas, was measured on a daily basis during 8 months spread along two larval periods (2006 and 2007) at the Ria de Aveiro estuary, on the Portuguese northwest coast. A total of 10 microsatellite DNA loci were employed to explore the genetic structure, variability and relatedness of temporally distinct megalopal events, selected from the major pulses of supply. Larval variation was also compared genetically with that of a previously studied adult crabs sample, at the same loci, collected in 2006 and 2007 along the Iberian Peninsula. Results revealed a lack of genetic differentiation and identical diversity levels among larval events over time. No evidence of reduced genetic diversity between megalopae relative to the diversity assessed from the pooled sample of adults was found. Moreover, there was no evidence of any family relatedness among larvae from temporal events. The results obtained for C. maenas contradict predictions made by the sweepstakes reproduction hypothesis, in which large variance in reproductive success is expected, which is presumably detectable as sharp genetic discontinuities among separate larval events. Data here indicate conversely a high degree of temporal genetic stability among larval supply to a given estuary under variable oceanographic conditions, consistent with the hypothesis that sampled larvae were drawn from a large number of adults that do not differ in reproductive success.

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Section: Introductionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Temporal genetic homogeneity among shore crab (Carcinus maenas) larval events supplied to an estuarine system on the Portuguese northwest coast

et al. 2010

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“…Transport pathways were revealed by seeding the models with particles offshore and subsequently computing the Lagrangian particle trajectories [9]. The particles simulated larvae that were competent to settle, swimming downward [10,11] and sinking in response to turbulence from breaking waves [12,13].…”

Section: Introductionmentioning

confidence: 99%

Surfzone hydrodynamics as a key determinant of spatial variation in rocky intertidal communities

et al. 2016

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Larvae of intertidal species develop at sea and must return to adult habitats to replenish populations. Similarly, nutrients, detritus and plankton provide important subsidies spurring growth and reproduction of macroalgae and filter-feeding invertebrates that form the foundation of intertidal communities. Together, these factors determine the density and intensity of interactions among community members. We hypothesized that spatial variation in surfzone hydrodynamics affects the delivery of plankton subsidies. We compared entire zooplankton communities inside and outside the surf zone daily while monitoring physical conditions for one month each at two shores with different surfzone characteristics. Opposite cross-shore distributions of larvae and other zooplankters occurred at the two sites: zooplankton was much more abundant inside the mildly sloping dissipative surf zone (DSZ) with rip currents and was more abundant outside the steep reflective surf zone (RSZ). Biophysical numerical simulations demonstrated that zooplankters were concentrated in rip channels of the DSZ and were mostly unable to enter the RSZ, indicating the hydrodynamic processes behind the observed spatial variation of zooplankters in the surf zone. Differences in the concentration of larvae and other zooplankters between the inner shelf and surf zone may be an underappreciated, key determinant of spatial variation in inshore communities.

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“…in the blue crab, Callinectes sapidus (Forward and Tankersley, 2001), or in the Chinese mitten crab, Eriocheir sinensis (Rudnick et al, 2005), this "export strategy" (Strathmann, 1982) includes downstream migrations of the ovigerous females, which mitigate the exposure of newly hatched larvae to hypo-osmotic stress. Other species release their planktonic larvae into the habitat of the adult population, from where they are rapidly transported downstream by outflowing surface currents (for recent review, see Queiroga and Blanton, 2004). After zoeal development in near-shore or continental shelf waters, the megalopa and/or the early benthic juvenile stages migrate back to the parental habitat.…”

Section: Introductionmentioning

confidence: 99%

Effects of reduced salinities on metamorphosis of a freshwater-tolerant sesarmid crab, Armases roberti: Is upstream migration in the megalopa stage constrained by increasing osmotic stress?

Torres

Anger

Giménez

2006

Journal of Experimental Marine Biology and Ecology

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Numerous species of estuarine and freshwater-tolerant crabs show an "export strategy", i.e. an early larval downstream transport towards coastal marine waters, later zoeal development at higher salinities, and a return of the last larval stage, the megalopa, into estuaries or rivers. The speed and extent of the upstream migration of the megalopa through strong salinity gradients may be constrained by increasing hypo-osmotic stress. In an experimental laboratory study with Armases roberti, a freshwater-inhabiting sesarmid crab from the Caribbean region, we studied in the megalopa stage (after zoeal rearing at 25‰) the tolerance of reduced salinities.In the first experiment, the larvae were exposed directly to various constant salinities (1-25‰). For the second experiment, they were transferred stepwise to strongly diluted media (within 6 days from 25‰ to ≤ 3‰), simulating differential scenarios of upstream migration into brackish or freshwater habitats.When postmoult megalopae were exposed directly to salinities ≤3‰, they all died within 24 h. A slightly higher salt concentration (5‰), however, allowed for considerable survival (46%) through metamorphosis to the first juvenile crab stage. In treatments with continuous exposure to 10-15‰, as well as in a control group (25‰), survival to metamorphosis was significantly higher (83-96%), and the average duration of development was shorter compared to 5‰ (12-13 vs. 16 days). In the second experiment, with stepwise salinity reductions, gradual acclimation to decreasing osmotic pressures permitted a successful development to metamorphosis at ≤3‰ and even in freshwater (b 0.2‰).This strong physiological adaptability enables the megalopa of A. roberti to cross during its upstream migration, within a short time (6 days), strong osmotic gradients, so that metamorphosis is possible also in freshwater habitats where the conspecific adult crabs live. The speed of migration appears to be limited by physiological constraints related to changes in the capability for osmoregulation occurring during the course of the moulting cycle.

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Interactions Between Behaviour and Physical Forcing in the Control of Horizontal Transport of Decapod Crustacean Larvae

Cited by 254 publications

References 209 publications

Temporal genetic homogeneity among shore crab (Carcinus maenas) larval events supplied to an estuarine system on the Portuguese northwest coast

Temporal genetic homogeneity among shore crab (Carcinus maenas) larval events supplied to an estuarine system on the Portuguese northwest coast

Surfzone hydrodynamics as a key determinant of spatial variation in rocky intertidal communities

Effects of reduced salinities on metamorphosis of a freshwater-tolerant sesarmid crab, Armases roberti: Is upstream migration in the megalopa stage constrained by increasing osmotic stress?

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