Egg production and energy storage in relation to feeding conditions in the subantarctic calanoid copepod Drepanopus pectinatus: an experimental study of reproductive strategy

Alonzo, Frédéric; Mayzaud, Patrick; Razouls, Suzanne

doi:10.3354/meps209231

Cited by 9 publications

(5 citation statements)

References 31 publications

(42 reference statements)

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“…A possible general explanation could be that the lipid dynamics of a given generation is driven by the accumulation of the previous generation of females. Hence, spring and summer variability in female lipid class composition could be linked to successive phases of neutral lipid accumulation and catabolism related to the high reproductive rate taking place during this period of time (Alonzo et al 2001). Late autumn-winter decrease in lipid reserves is probably a response to both low food conditions and lower level of reproduction entirely based on the internal pool of lipid reserves (Alonzo et al 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Hence, spring and summer variability in female lipid class composition could be linked to successive phases of neutral lipid accumulation and catabolism related to the high reproductive rate taking place during this period of time (Alonzo et al 2001). Late autumn-winter decrease in lipid reserves is probably a response to both low food conditions and lower level of reproduction entirely based on the internal pool of lipid reserves (Alonzo et al 2001). Although total lipid content is moderate (30-40% dry weight) when compared to large Calanus species (Lee et al 2006), the seasonal dynamics of lipids was related to the accumulation of wax esters in spring and summer (reproductive period).…”

Section: Discussionmentioning

confidence: 99%

“…Although total lipid content is moderate (30-40% dry weight) when compared to large Calanus species (Lee et al 2006), the seasonal dynamics of lipids was related to the accumulation of wax esters in spring and summer (reproductive period). The coincidence between high phytoplankton biomass and high wax esters content does not mean that lipid accumulation controlled egg production since Alonzo et al (2001) established that D. pectinatus used ingested phytoplankton to reduce the consumption of their internal lipid reserves. The seasonal changes in total lipid and WE suggested that for multigeneration species, the overwintering pattern with high lipid accumulation does not apply since winter individuals showed the smallest size and lowest lipid levels.…”

Section: Discussionmentioning

confidence: 99%

“…Late autumn–winter decrease in lipid reserves is probably a response to both low food conditions and lower level of reproduction entirely based on the internal pool of lipid reserves (Alonzo et al . 2001). Although total lipid content is moderate (30–40% dry weight) when compared to large Calanus species (Lee et al .…”

Section: Discussionmentioning

confidence: 99%

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Seasonal and growth stage changes in lipid and fatty acid composition in the multigeneration copepodDrepanopus pectinatusfrom Iles Kerguelen

2010

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Changes in adult weight, lipid and fatty acid composition per lipid class were studied over a complete seasonal cycle in Drepanopus pectinatus Brady. This copepod displayed a strong seasonality in adult individual weight and total lipid content. Stages C3 to adult from a summer cohort were compared in terms of lipid and fatty acid structure. Changes in lipid content were related to wax esters and polar lipids (PL) while triacylglycerols (TAG) and cholesterol remained minor constituents except at the end of winter. Changes in fatty acid composition of different lipid classes showed that food limitation in winter was high enough to affect 22:6n-3 (DHA) content in PL, and provoke accumulation of maximal percentages of bacterial marker as branched acids. Composition of TAG followed closely the changes in trophic interactions as diatom and flagellate markers dominated in spring and summer while bacterial and detritus particle markers dominated in late winter. The composition of wax esters followed the same seasonal succession but with a lower level of turn over time and shifted characteristics (bacterial markers) from winter to spring individuals when compared to TAG. Ontogenetic changes showed high triacylglycerols content in younger C3 stages and increasing wax esters with increasing developmental stages. Fatty acid composition of PL showed low percentages of EPA and DHA in stage C3, and recovery of high levels of DHA for stage C4 or 20:5n-3 (EPA) at stage C5. The same trend was observed for 18:4n-3. The reverse pattern was noted for the n-6 polyunsaturated acids (PUFA) suggesting a greater requirement in younger stages. Fatty acid partitioning between neutral and PL suggested essential fatty acids selective incorporation from neutral classes into membrane lipids.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Seasonal and growth stage changes in lipid and fatty acid composition in the multigeneration copepodDrepanopus pectinatusfrom Iles Kerguelen

2010

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“…The same was the case of Drepanopus forcipatus, which in 1995 was overwhelming dominant. To our knowledge there is no information on feeding requirements and environmental preferences of this species, but reproduction of the closely-related species Drepanopus pectinatus seems to be strongly dependent on high concentrations of phytoplankton (Alonzo et al, 2001). Santos (1993) also reported high numbers of both species off Isla Escondida.…”

Section: Spatial Patterns Of Plankton Communitiesmentioning

confidence: 99%

Mesozooplankton features in a frontal area off northern Patagonia (Argentina) during spring 1995 and 1998

Sabatini¹,

Martos²

2002

Sci. Mar.

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Hydrography and spatial patterns of mesozooplankton communities in a frontal area off northern Patagonian were investigated in spring 1995 and 1998. Differential wind/tidal relative forcing appeared to drive along-shelf variations in the physical structure of the front and hence, planktonic patterns. Approaching the northern border of the system, the conspicuous presence of Oithona helgolandica, cladocerans and appendicularians, and the low fecundities of calanoid copepods suggest that a high proportion of the primary production may be channelled through microheterotrophic processes. Towards the southern area, calanoids dominated over cyclopoids, 'large' species (Drepanopus forcipatus, Calanoides cf. carinatus) were abundant, and copepod fecundities were high and steady, suggesting that there may be a more classical-like herbivorous food web. Paracalanus parvus and Ctenocalanus vanus occurred over the whole system but seemed to be key species in mixed and weakly stratified waters. Copepods peaked in stratified waters away from the front itself, while the abundance of eggs and nauplii was highest in weakly stratified waters next to the front. Apparently, the general heating occurring over the region in spring 1998 strongly affected both the physical and biological structure of the system. Unlike in 1995, a massive bloom of gelatinous zooplankton took place in 1998 and a bloom of the phagotrophic dinoflagellate Noctiluca sp. occurred in the northern area. Co-occurring copepod populations were depressed and their reproductive patterns seemed to be highly disrupted. Present observations stress the significance of variable external forcing in driving satisfactory habitat conditions for juvenile fish in the area.Key words: zooplankton, tidal front, food webs. RESUMEN: CARACTERÍSTICAS DEL MESOZOOPLANCTON EN UN ÁREA FRONTAL DE PATAGONIA NORTE (ARGENTINA) DURANTE LA PRIMAVERA DE 1995 Y 1998. -Los patrones de distribución del mesozooplancton fueron estudiados en un área frontal ubicada en la plataforma continental norpatagónica (Argentina) durante las primaveras de 1995 y 1998. Las variaciones latitudinales en la intensidad relativa de los forzantes viento y marea serían responsables de las diferencias observadas a lo largo de la estructura física del sistema. Estas diferencias llevan a patrones de composición y distribución del plancton también diferentes. Hacia el norte, la conspicua presencia de Oithona helgolandica, cladóceros y apendicularios, y las bajas fecundidades de copépodos calanoideos que se registraron, sugieren que allí una alta proporción de la producción primaria podría estar siendo canalizada a través de procesos microheterotróficos. Hacia el extremo sur, en cambio, los copépodos calanoideos dominaron sobre los ciclopoideos, fueron abundantes especies relativamente 'grandes' (Drepanopus forcipatus, Calanoides cf. carinatus) y las fecundidades de copépodos fueron altas, sugiriendo allí la existencia de una trama trófica clásica, básicamente herbívora. Los copépodos Paracalanus parvus y Ctenocalanus vanus e...

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Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands

Alonzo¹,

Mayzaud²,

Razouls³

et al. 2002

Marine Biology

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12 pagesInternational audienceThe present study addresses the ecology of two dominant copepod species in the Bay of Morbihan, Kerguelen Archipelago. The biomass of the herbivore Drepanopus pectinatus (from 2 mg m)3 in winter up to 500 mg m)3 in summer) is tightly coupled to seasonal changes in chlorophyll a concentration in the region, whereas the biomass of the predatory euchaetiid Paraeuchaeta antarctica increases during two distinct periods over the year: 250 mg m)3 in early summer, with the recruitment of the annual generation, and 100 mg m)3 in autumn, with the deposition of lipids as energy reserves in C5 stages and adults. The juvenile growth rates predicted by temperature-dependent models (0.09 day)1) closely approximate those observed in D. pectinatusin summer, but are much greater than those observed in P. antarctica (from 0.001 to 0.04 day)1 depending on developmental stages). This difference can be explained by the reproductive strategies and trophic positions of the two species and may also result from the dependence of larval growth on energy reserves in P. antarctica. The production rates are five- and tenfold greater in juvenile stages than in adults, respectively, for D. pectinatus and P. antarctica. The secondary production by D. pectinatusis insufficient to support P. antarctica during winter, when the predatory species probably shifts to alternate prey. In summer the predation by P. antarctica accounts for only a minor part of the mortality estimated for D. pectinatus (from 20% to 60% depending on the examined station). At two of the three stations examined in the Bay of Morbihan, the production of P. antarctica could potentially support the dietary requirements of planktivorous seabirds in the region (2,000 kg prey day)1 for common diving petrels, Pelecanoides urinatrix, and 90 kg prey day)1 for rockhopper penguins, Eudyptes chysocome filholi)

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Egg production and energy storage in relation to feeding conditions in the subantarctic calanoid copepod Drepanopus pectinatus: an experimental study of reproductive strategy

Cited by 9 publications

References 31 publications

Seasonal and growth stage changes in lipid and fatty acid composition in the multigeneration copepodDrepanopus pectinatusfrom Iles Kerguelen

Seasonal and growth stage changes in lipid and fatty acid composition in the multigeneration copepodDrepanopus pectinatusfrom Iles Kerguelen

Mesozooplankton features in a frontal area off northern Patagonia (Argentina) during spring 1995 and 1998

Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands

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