Oceanic rafting by a coastal community

Fraser, Ceridwen I.; Nikula, Raisa; Waters, Jonathan M.

doi:10.1098/rspb.2010.1117

Cited by 213 publications

(210 citation statements)

References 48 publications

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“…Prevailing oceanographic forces are thought to predominantly drive the direction of the dispersal of drifting organisms [52]. However, we show here that storm-forcing may perturb these regular patterns and although this may lead to novel dispersal or migration patterns, many individuals are also 'lost at sea' as a result.…”

Section: Discussionmentioning

confidence: 74%

Lost at sea: genetic, oceanographic and meteorological evidence for storm-forced dispersal

Monzón‐Argüello

Dell’Amico

Morinière

et al. 2012

J. R. Soc. Interface.

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For many species, there is broad-scale dispersal of juvenile stages and/or long-distance migration of individuals and hence the processes that drive these various wide-ranging movements have important life-history consequences. Sea turtles are one of these paradigmatic long-distance travellers, with hatchlings thought to be dispersed by ocean currents and adults often shuttling between distant breeding and foraging grounds. Here, we use multi-disciplinary oceanographic, atmospheric and genetic mixed stock analyses to show that juvenile turtles are encountered ‘downstream’ at sites predicted by currents. However, in some cases, unusual occurrences of juveniles are more readily explained by storm events and we show that juvenile turtles may be displaced thousands of kilometres from their expected dispersal based on prevailing ocean currents. As such, storms may be a route by which unexpected areas are encountered by juveniles which may in turn shape adult migrations. Increased stormy weather predicted under climate change scenarios suggests an increasing role of storms in dispersal of sea turtles and other marine groups with life-stages near the ocean surface.

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Section: Discussionmentioning

confidence: 74%

Lost at sea: genetic, oceanographic and meteorological evidence for storm-forced dispersal

Monzón‐Argüello

Dell’Amico

Morinière

et al. 2012

J. R. Soc. Interface.

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“…Dispersal by rafting is considered as an important means of maintaining population connectivity on both small and large spatial scales: marine organisms that use rafting for dispersing can maintain large and relatively homogeneous populations with little or no genetic subdivision (Fraser et al 2011;Hoeksema et al 2012;Xavier et al 2012). However, some studies have shown that rafting facilitates dispersal, but does not necessarily maintain genetic connectivity among distant populations (Waters and Roy 2004;Baratti et al 2005;Waters 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Some of the most common marine invertebrates reported rafting are peracarid crustaceans (amphipods, isopods, and tanaids) (Sano et al 2003;Fraser et al 2011;Xavier 2011). All peracarids have direct development and, in many species, females provide extended parental care for their offspring (Thiel 2003).…”

Section: Introductionmentioning

confidence: 99%

Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

et al. 2012

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The amphipod Caprella andreae Mayer, 1890 was recorded for the first time in Southern Iberian Peninsula (36°44 0 15 00 N, 3°59 0 38 00 W). This species is the only obligate rafter of the suborder Caprellidea and has been reported to attach not only to floating objects such as ropes or driftwoods but also to turtle carapaces. Mitochondrial and nuclear markers were used to examine dispersal capabilities and population genetic structure of C. andreae across seven localities in the Mediterranean and Atlantic Ocean collected from floating substrata with different dispersal patterns. The strong population differentiation with no haplotypes shared between populations suggests that C. andreae is quite faithful to the substratum on which it settles. In addition, the proportionally higher genetic diversity displayed in populations living on turtles as well as the presence of highly differentiated haplotypes in the same turtle population may be indicative that these populations survive longer, which could lead C. andreae to prefer turtles instead of floating objects to settle and disperse. Therefore, rafting on floating objects may be sporadic, and ocean currents would not be the most important factor shaping patterns of connectivity and population structure in this species. Furthermore, molecular phylogenetic analyses revealed the existence of a cryptic species whose estimates of genetic divergence are higher than those estimated between C. andreae and other congeneric species (e.g. Caprella dilatata and Caprella penantis). Discovery of cryptic species among widely distributed small marine invertebrates is quite common and, in this case, prompts for a more detailed phylogenetic analysis and taxonomic revision of genus Caprella. On the other hand, this study also means the first record of the gammarids Jassa cadetta and Elasmopus brasiliensis and the caprellid Caprella hirsuta on drifting objects.

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“…This approach can be applied to numerous questions ranging from the direction and distance of dispersal in deep-sea invertebrate larvae [5,32], to the duration of drift between suitable habitats for rafting communities associated with macroalgae [33]. Given the limited information on organisms in the open sea (e.g.…”

Section: Discussionmentioning

confidence: 99%

Finding the ‘lost years’ in green turtles: insights from ocean circulation models and genetic analysis

Putman

Naro‐Maciel

2013

Proc. R. Soc. B.

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Organismal movement is an essential component of ecological processes and connectivity among ecosystems. However, estimating connectivity and identifying corridors of movement are challenging in oceanic organisms such as young turtles that disperse into the open sea and remain largely unobserved during a period known as 'the lost years'. Using predictions of transport within an ocean circulation model and data from published genetic analysis, we present to our knowledge, the first basin-scale hypothesis of distribution and connectivity among major rookeries and foraging grounds (FGs) of green turtles (Chelonia mydas) during their 'lost years'. Simulations indicate that transatlantic dispersal is likely to be common and that recurrent connectivity between the southwestern Indian Ocean and the South Atlantic is possible. The predicted distribution of pelagic juvenile turtles suggests that many 'lost years hotspots' are presently unstudied and located outside protected areas. These models, therefore, provide new information on possible dispersal pathways that link nesting beaches with FGs. These pathways may be of exceptional conservation concern owing to their importance for sea turtles during a critical developmental period.

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Oceanic rafting by a coastal community

Cited by 213 publications

References 48 publications

Lost at sea: genetic, oceanographic and meteorological evidence for storm-forced dispersal

Lost at sea: genetic, oceanographic and meteorological evidence for storm-forced dispersal

Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

Finding the ‘lost years’ in green turtles: insights from ocean circulation models and genetic analysis

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