Integrated biochemical, molecular genetic, and bioacoustical analysis of mesoscale variability of the euphausiid Nematoscelis difficilis in the California Current

Bucklin, Ann; Wiebe, Peter H.; Smolenack, Sara B.; Copley, Nancy J.; Clarke, M. Elizabeth

doi:10.1016/s0967-0637(01)00063-2

Cited by 18 publications

(9 citation statements)

References 32 publications

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“…length), mostly carnivorous species that performs extensive daily vertical migrations and is mostly distributed in oceanic regions across the North Pacific Ocean (Brinton 1962, Brinton & Townsend 1980. However, they show a strong preference for the neritic zone in the California Current System (Bucklin et al 2002). N. difficilis has occasionally been observed aggregating near surface during the day, but in low densities, supposedly having large NND (> 50 cm to meters) (D. L. Gendron pers.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Parasite diversity of Nyctiphanes simplex and Nematoscelis difficilis (Crustacea: Euphausiacea) along the northwestern coast of Mexico

Gómez‐Gutiérrez¹,

Robinson²,

Kawaguchi³

et al. 2010

Dis. Aquat. Org.

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The diversity of parasites found on Nyctiphanes simplex and Nematoscelis difficilis (Order Euphausiacea) was compared during 10 oceanographic cruises made off both coasts of the Baja California peninsula, Mexico. We tested the hypothesis that N. simplex has a more diverse parasitic assemblage than N. difficilis because it is a neritic species, has larger population abundance, and tends to form denser and more compact swarms than N. difficilis. These biological and behavioral features may enhance parasite transmission within swarms. We detected 6 types of ectoparasites: (1) epibiotic diatoms Licmophora sp.; (2) Ephelotidae suctorian ciliates; (3) Foettingeriidae exuviotrophic apostome ciliates; (4) an unidentified epicaridean cryptoniscus larvae (isopoda); and 2 castrators: (5) the ectoparasitic Dajidae isopod Notophryxus lateralis and (6) the ellobiopsid mesoparasite Thalassomyces fagei. We also detected 7 types of endoparasites: (1) an undescribed Collinia ciliate (Apostomatida); 3 types of Cestoda: (2) a Tetrarhynchobothruium sp. (Trypanorhyncha), (3) Echinobothrium sp. (Diphyllidea: Echinobothyriidae), and (4) unidentified metacestode; (5) a Trematoda Paronatrema-like metacercaria (Syncoeliidae); (6) the nematode Anisakis simplex (L3); and (7) Polymorphidae acantocephalan larvae (acanthor, acanthella, and cystacanth larval stages). N. simplex is affected by all types of parasites, except the isopod N. lateralis, having a considerably larger parasitic diversity and prevalence rates than N. difficilis, which is only infested with 3 types of ectoparasites and T. fagei. Euphausiid swarming is an adaptive behavior for reproduction, protection against predators, and increased efficiency in food searching, but has a negative effect due to parasitism. Although the advantages of aggregation must overcome the reduction of population and individual fitness induced by parasites, we demonstrated that all types of parasites can affect ~14% of N. simplex individuals. Collinia spp. endoparasitoids must occasionally have a significant influence on population mortality with potential epizootic events.KEY WORDS: Parasites · Parasitoids · Euphausiids · Nyctiphanes simplex · Nematoscelis difficilis · Bahía Magdalena · Gulf of California Resale or republication not permitted without written consent of the publisherDis Aquat Org 88: [249][250][251][252][253][254][255][256][257][258][259][260][261][262][263][264][265][266] 2010 increasing number of parasites and parasitoids have been discovered. The parasites of euphausiids include an array of interspecific associations that ranges from almost innocuous parenthetic epibiotic organisms such as diatoms (McClatchie et al. 1990), suctorians (Nicol 1984, Tarling & Cuzin-Roudy 2008, and apostome exuviotrophic ciliates (Lindley 1978, Rakusa-Suszczewski & Filcek 1988, Landers et al. 2006, to castrators (Field 1969) and parasitoids (Capriulo & Small 1986, Gómez-Gutiérrez et al. 2003, 2006, 2009. It is now apparent that each euphausiid species has a complex interspecific parasite...

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Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Parasite diversity of Nyctiphanes simplex and Nematoscelis difficilis (Crustacea: Euphausiacea) along the northwestern coast of Mexico

Gómez‐Gutiérrez¹,

Robinson²,

Kawaguchi³

et al. 2010

Dis. Aquat. Org.

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“…These genes provide additional targets to investigate environmentally meaningful genetic variation. In another krill species, such as Euphausia superba and Nematoscelis difficilis, LDH, PGI, and CS showed geographic differences in concentrations in association with environmental variation (Bucklin et al, 2002;Fevolden and Schneppenheim, 1989). Genes controlling reproductive processes were also investigated in M. norvegica in relation to species' timing of reproduction.…”

Section: Genes Enzymes and Adaptationmentioning

confidence: 99%

Genetics of Northern Krill (Meganyctiphanes norvegica Sars)

Patarnello

Papetti

Zane

2010

Advances in Marine Biology

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“…The first data set has 372 measurements of salinity density off the coast of Southern California in the CalCOFI survey [30], based on which a 30 Â 30 estimation map with ¼ 0:2 is generated. Fig.…”

Section: Estimation Resultsmentioning

confidence: 99%

“…In our simulations, the behavior of sensor networks is simulated by treating each sensor node as a thread running independently and communicating with each other by exchanging messages. The data sets consist of two real data sets from the CalCOFI survey off the coast of Southern California [30] and from a snapshot from an experiment in the Intel Laboratory [31] and two synthetic data sets. Without loss of generality, we normalized the sensor readings to [0, 1].…”

Section: Experimental Evaluationmentioning

confidence: 99%

Towards Spatial Window Queries Over Continuous Phenomena in Sensor Networks

Jin

Nittel

2008

IEEE Trans. Parallel Distrib. Syst.

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Recent research on sensor networks has focused on the efficient processing of declarative SQL queries over sensor nodes. Users are often interested in querying an underlying continuous phenomenon such as a toxic plume, whereas only discrete readings of sensor nodes are available. Therefore, additional information estimation methods are necessary to process the sensor readings to generate the required query results. Most estimation methods are computationally intensive, even when computed in a traditional centralized setting. Furthermore, energy and communication constraints of sensor networks challenge the efficient application of established estimation methods in sensor networks. In this paper, we present an approach using Gaussian kernel estimation to process spatial window queries over continuous phenomena in sensor networks. The key contribution of our approach is the use of a small number of Hermite coefficients to approximate the Gaussian kernel function for subclustered sensor nodes. As a result, our algorithm reduces the size of messages transmitted in the network by logarithmic order, thus saving resources while still providing high-quality query results.

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Integrated biochemical, molecular genetic, and bioacoustical analysis of mesoscale variability of the euphausiid Nematoscelis difficilis in the California Current

Cited by 18 publications

References 32 publications

Parasite diversity of Nyctiphanes simplex and Nematoscelis difficilis (Crustacea: Euphausiacea) along the northwestern coast of Mexico

Parasite diversity of Nyctiphanes simplex and Nematoscelis difficilis (Crustacea: Euphausiacea) along the northwestern coast of Mexico

Genetics of Northern Krill (Meganyctiphanes norvegica Sars)

Towards Spatial Window Queries Over Continuous Phenomena in Sensor Networks

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