Julia L. Y. Spaet

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The Red Sea has long been recognized as a region of high biodiversity and endemism. Despite this diversity and early history of scientific work, our understanding of the ecology of coral reefs in the Red Sea has lagged behind that of other large coral reef systems. We carried out a quantitative assessment of ISI-listed research published from the Red Sea in(More)
For free-swimming marine species like sharks, only population genetics and demographic history analyses can be used to assess population health/status as baseline population numbers are usually unknown. We investigated the population genetics of blacktip reef sharks, Carcharhinus melanopterus; one of the most abundant reef-associated sharks and the apex(More)
Given the global concern about the status of elasmobranch fishes, the paucity of information on elasmobranchs in the Red Sea is worrisome. Management of elasmobranchs in areas other than the Red Sea has been helped by research on population ecology, reproductive biology and resource partitioning, subjects that are virtually absent in the Red Sea(More)
The northwestern Indian Ocean harbors a number of larger marine vertebrate taxa that warrant the investigation of genetic population structure given remarkable spatial heterogeneity in biological characteristics such as distribution, behavior, and morphology. Here, we investigate the genetic population structure of four commercially exploited shark species(More)
Mercury (Hg) exposure poses a threat to both fish and human health. Sharks are known to bioaccumulate Hg, however, little is known regarding how Hg is distributed between different tissue groups (e.g. muscle regions, organs). Here we evaluated total mercury (THg) concentrations from eight muscle regions, four fins (first dorsal, left and right pectorals,(More)
Despite being frequently landed in fish markets along the Saudi Arabian Red Sea coast, information regarding fundamental biology of the Scalloped hammerhead shark (Sphyrna lewini) in this region is scarce. Satellite telemetry studies can generate important data on life history, describe critical habitats, and ultimately redefine management strategies for(More)
Numerous species of coral reef fishes are known to form shortlived, temporally and spatially predictable aggregations for the specific purpose of reproduction (Claydon 2004). Such spawning aggregations are important both economically and ecologically. While these aggregations serve an essential role for ecosystem function, they are highly susceptible to(More)
Shark-cetacean aggregations and associations of false killer whales (Pseudorca crassidens) with other cetaceans have been reported previously (e.g., Heithaus 2001; Baird et al. 2008). However, this is the first description of nonaggressive associations of P. crassidens with noncetaceans. Here we report encounters of P. crassidens associated with silky(More)
Eighteen microsatellite loci were developed for the silky shark Carcharhinus falciformis and screened across a total of 53 individuals from the western Atlantic Ocean, Eastern Tropical Pacific Ocean, and Red Sea. The number of alleles per locus ranged from 3 to 19, observed heterozygosity ranged from 0.158 to 0.917, and the probability of identity values(More)
Longnose parrotfish (Hipposcarus harid) routinely aggregate in large schools once a year during the spring (Gladstone 1996) in a shallow lagoon in the Farasan Islands (16°43′44.16′′N, 42°4′24.47′′E) of the Southern Red Sea. Known to locals for the past two centuries, this aggregation is the reason for Saudi Arabia’s traditional Hareed Festival ( ه ج ا ن ا ح(More)
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