Physiological condition and differential feeding behaviour in the cryptic species complex Eurytemora affinis in the St Lawrence estuary

Cabrol, Jory; Winkler, Gesche; Tremblay, Réjean

doi:10.1093/plankt/fbu111

Cited by 25 publications

(21 citation statements)

References 83 publications

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“…As T. raschii gained higher amounts of the FATMs for bacteria during winter (Supporting Information Table S3), we suggest a probable feeding on detritus/bacteria/sediment as found elsewhere (Berkes ; Sargent and Falk‐Petersen ). Rich saturated FAs of detritus and bacteria provide more energy than polyunsaturated FAs during β‐oxidation (Langdon and Waldock 1981), as found for copepods in the St. Lawrence estuary (Cabrol et al ).…”

Section: Discussionmentioning

confidence: 88%

“…Assessing the food preference of consumers is a key prerequisite to the understanding of species interactions, especially among closely related sympatric species (Agersted et al ; Cabrol et al ). Integrating multiple indirect methods increase the successful determination of trophic niches (Hambäck et al ; Gaillard et al ), especially the integration of all potential preys reduces the potential lack or overestimation of rare diet items (Iverson et al ; Jeffs et al ; Nielsen et al ).…”

Section: Discussionmentioning

confidence: 99%

“…Total FA compositions of zooplankton and POM were analyzed as described in Cabrol et al (2015). Briefly, lipids were directly extracted from samples kept in dichloromethane : methanol by grinding using a modified Folch procedure (Chen et al 1981) as described in detail in Parrish (1999).…”

Section: Fa and Sia Of Potential Food Sourcesmentioning

confidence: 99%

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Trophic niche partitioning of dominant North‐Atlantic krill species, Meganyctiphanes norvegica, Thysanoessa inermis, and T. raschii

Cabrol

Trombetta

Amaudrut

et al. 2018

Limnology & Oceanography

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Different krill species have a pivotal position in many marine food webs by both preying upon several trophic levels and being forage species for consumers. Within these food webs, different krill species coexist, though it remains unclear what mechanisms allow for the coexistence, for instance, of northern krill species in subarctic environments. Here, we hypothesize that the stable coexistence of sympatric krill species is based on trophic niche partitioning related to seasonal trade‐offs between their respective food preferences, their energy needs, and prey availability. To test our hypothesis, we analyzed the diets, feeding selectivity, and lipid composition of three coexisting northern krill species (Meganyctiphanes norvegica, Thysanoessa inermis, and Thysanoessa raschii) throughout 1 yr using a multimarker approach. We assessed lipid classes, fatty acids, and stable isotope signatures of krill and potential food sources (27 groups, from phytoplankton to lipid‐rich copepods) to elucidate seasonal variation of niche utilization. Results revealed strong trophic niche separation occurring at a very fine trophic scale (species level) throughout the year. The three krill species showed different degrees of food specialization rather than being purely opportunistic as classically proposed. Feeding on copepod prey was important to accumulate energy reserves for overwintering and subsequent rebuilding of energy reserves. Energy reserve utilization might reduce potential competition for the limited available resources, especially under low food conditions.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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Trophic niche partitioning of dominant North‐Atlantic krill species, Meganyctiphanes norvegica, Thysanoessa inermis, and T. raschii

Cabrol

Trombetta

Amaudrut

et al. 2018

Limnology & Oceanography

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“…Mitochondrial DNA analysis performed during the past fifteen years suggested that two clades inhabit the St. Lawrence estuary region, an invasive Atlantic clade and a non-invasive North Atlantic clade (Cabrol et al, 2015; Favier and Winkler, 2014; Lee, 1999; Winkler et al, 2008). Attempts to mate individuals from two populations with each other did not produce viable reproductive adult offspring (Lee, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Significant work has been completed in studying the life history, mechanisms of invasion and biogeography of Eurytemora taxa in North America (Cabrol et al, 2015; Dodson et al, 2010; Favier and Winkler, 2014; Lee, 1999; Lee and Frost, 2002; Posavi et al, 2014; Winkler et al, 2008). Eurytemora , typically identified as E. affinis , has been known to play an important role as a dominant grazer in marine, estuarine, and freshwater systems and is considered to be a cosmopolitan species due to its broad biogeographic range encompassing subtropical to subarctic areas (Lee, 2000; Suarez-Morales et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Eurytemora carolleeae in the Laurentian Great Lakes revealed by phylogenetic and morphological analysis

Vasquez

Hudson

Fujimoto

et al. 2016

Journal of Great Lakes Research

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In the Laurentian Great Lakes, specimens of Eurytemora have been reported as E. affinis since its invasion in the late 1950s. During an intensive collection of aquatic invertebrates for morphological and molecular identification in Western Lake Erie in 2012-2013, several specimens of Eurytemora were collected. Analysis of these specimens identified them as the recently described species E. carolleeae Alekseev and Souissi 2011. This result led us to assess E. carolleeae's identifying features, geographic distribution and historical presence in the Laurentian Great Lakes in view of its recent description in 2011. Cytochrome oxidase I (COI) DNA sequences of Eurytemora specimens were identified as closer (2 - 4% different) to recently described E. carolleeae than to most Eurytemora affinis sequences (14% different). Eurytemora from other areas of the Great Lakes and from North American rivers as far west as South Dakota (Missouri River) and east to Delaware (Christina River) also keyed to E. carolleeae. Morphological analysis of archival specimens from 1962 and from all the Great Lakes were identified as E. carolleeae. Additionally, Eurytemora drawings in previous publications from studies in the Holarctic region were reassessed to determine if these specimens were E. carolleeae. Additional morphological characters that may distinguish the North American E. carolleeae from other taxa are also described. We conclude that E. carolleeae is the correct name for the species of Eurytemora that has inhabited the Great Lakes since its invasion, as established by both morphological and COI sequence comparisons to reference keys and sequence databases in present and archival specimens.

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Fatty acid composition as a function of latitude in barnacle cyprid larvae

Leal,

Thyrring,

Flores

et al. 2024

Limnology & Oceanography

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Broadly distributed species need to perform well in a range of environmental conditions, but knowledge of how wide‐ranging marine larvae perform along latitudinal gradients remains limited. The fatty acid composition of larvae is important for their physiological responses to changing conditions. Here, we investigated the fatty acid composition of the last, non‐feeding stage of barnacle larvae (cyprids) using an integrative (larvae–environment) and comparative (latitudinal) approach. We measured fatty acids in the pelagic particulate matter and cyprids from Chthamalus bisinuatus, Chthamalus proteus, and Semibalanus balanoides from tropical to polar (Arctic) latitudes to identify potential food sources during the feeding larval stages (nauplius) that precede the cyprids and to ascertain larval capacity to integrate neutral (energetic) and polar (structural) fatty acids. We demonstrate that particulate matter in tropical waters mainly consisted of low‐quality saturated fatty acids derived from detrital pathways, while particulate matter from polar waters was rich in polyunsaturated fatty acids originating from living microalgae. Across the studied regions, neutral fatty acids were assimilated from various food sources including diatoms, dinoflagellates, detritus, and microeukaryotes. Cyprids consistently retained higher essential fatty acid levels than the relative share in the particulate matter. Particularly, the essential docosahexaenoic acid (22:6ω3), which was scarce in the particulate matter, was highly retained across all species but highest for the tropical cyprids. We argue that this latitudinal pattern in fatty acid retention is related to periods of reduced nutrient intake, increased energetic and/or synthetic requirements, and responses to physical large‐scale differences in environmental conditions.

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Physiological condition and differential feeding behaviour in the cryptic species complex Eurytemora affinis in the St Lawrence estuary

Cited by 25 publications

References 83 publications

Trophic niche partitioning of dominant North‐Atlantic krill species, Meganyctiphanes norvegica, Thysanoessa inermis, and T. raschii

Trophic niche partitioning of dominant North‐Atlantic krill species, Meganyctiphanes norvegica, Thysanoessa inermis, and T. raschii

Eurytemora carolleeae in the Laurentian Great Lakes revealed by phylogenetic and morphological analysis

Fatty acid composition as a function of latitude in barnacle cyprid larvae

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