Annual life cycle of the copepod Eucalanus inermis at a coastal upwelling site off Mejillones (23�S), northern Chile

Hidalgo, Pamela; Escribano, Rubén; Morales, Carmen E.

doi:10.1007/s00227-004-1487-3

Cited by 17 publications

(14 citation statements)

References 29 publications

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“…However, direct grazing rates of the mesozooplankton community, as assessed by gut fluorescence, were relatively low during these central CRD cycles compared with Cycles 3 and 5, reflecting the greater dominance of primary production by picophytoplankton at the central CRD stations (Décima et al, 2016). The potential for E. inermis to exert control on the cyanobacteria associated with fluorescence peaks has been suggested by Hidalgo et al (Hidalgo et al, 2005b).…”

Section: Influence Of Environment and Comparison With Previous Yearsmentioning

confidence: 91%

Vertical distribution of Eucalanoid copepods within the Costa Rica Dome area of the Eastern Tropical Pacific

Jackson

Smith

2016

J. Plankton Res.

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A variety of ecological strategies for tolerance of low-oxygen conditions within the Costa Rica Dome (CRD) area of the Eastern Tropical Pacific are documented for the copepod family Eucalanidae. During the summer of 2010, we compared the ecological strategies used by the Eucalanidae inside and outside the central CRD region. We compared the vertical and horizontal distributions of five species, ,, , and together with species, in the epipelagic (upper 200 m) among four locations, which we grouped into a section roughly crossing the core CRD area (inside-outside core CRD). The coastal area outside the CRD supported the most diverse assemblage, whereas overall abundance of Eucalanidae in the central CRD was 2-fold greater than outside and dominated by (>60%). Eucalanidae in the central CRD had a shallow depth distribution, closely associated with the shallow thermocline (10-20 m). There was no evidence of daily vertical migration in the central CRD, but demonstrated vertical migration outside the CRD. The vertical abundance patterns of Eucalanidae in the CRD region reflect complex interactions between subtle physical-chemical differences and food resources.

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Section: Influence Of Environment and Comparison With Previous Yearsmentioning

confidence: 91%

Vertical distribution of Eucalanoid copepods within the Costa Rica Dome area of the Eastern Tropical Pacific

Jackson

Smith

2016

J. Plankton Res.

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“…In an earlier study in the same general region and depth (but not noted if individuals were diapausing), transmission electron microscope analyses of E. inermis gut contents included some tissue and copepod gut epithelium, not visible with light microscopy (Gowing and Wishner, 1992). The seasonal ontogenetic and reproductive cycle of E. inermis was documented at a location off Chile but the sampling depth was too shallow (75 m) to elucidate deeper diapause behavior (Hidalgo et al, 2005a(Hidalgo et al, , 2005b. Another calanoid copepod, Calanus pacificus, also has an apparent diapause layer just above the anoxic bottom water of the deep Santa Barbara Basin off California (Alldredge et al, 1984;Osgood and Checkley Jr, 1997), and Calanoides carinatus in the Arabian Sea and Benguela Current diapauses at depth just below the extensive OMZ (Auel and Verheye, 2007;Smith et al, 1998;Smith, 1982;Wishner et al, 2008).…”

Section: Diapausing In the Omzmentioning

confidence: 90%

“…Eucalanus inermis is endemic to the ETP, occurring both north and south of the equator (Chen, 1986;Fleminger, 1973;Goetze, 2003Goetze, , 2010Goetze and Ohman, 2010;Hidalgo et al, 2005bHidalgo et al, , 2005aJackson and Smith, 2016;Sameoto, 1986). It is known to inhabit extremely low oxygen water (Boyd et al, 1980;Escribano et al, 2009;Judkins, 1980;Saltzman and Wishner, 1997;Wishner et al, 2013), as well as oxygenated depths, and has unique physiological and biochemical adaptations for the low oxygen environment Cass and Daly, 2015).…”

Section: Diapausing In the Omzmentioning

confidence: 99%

Ocean Deoxygenation and Copepods: Coping with Oxygen Minimum Zone Variability

Wishner¹,

Seibel²,

Outram³

2019

Preprint

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Abstract. Increasing deoxygenation (loss of oxygen) of the ocean, including expansion of oxygen minimum zones (OMZs), is a potentially important consequence of global warming. We examined present day variability of vertical distributions of copepod species in the Eastern Tropical North Pacific (ETNP) living in locations with different water column oxygen profiles and OMZ intensity (lowest oxygen concentration and its vertical extent in a profile). Copepods and hydrographic data were collected in vertically-stratified day and night MOCNESS tows (0&#8211;1000&#8201;m) during 4 cruises over a decade (2007&#8211;2017) that sampled 4 ETNP locations: Costa Rica Dome, Tehuantepec Bowl, and 2 oceanic sites further north (21&#176;&#8211;22&#176;&#8201;N) off Mexico. The sites had different vertical oxygen profiles: some with a shallow mixed layer, abrupt thermocline, and extensive very low oxygen OMZ core, and others with a more gradual vertical development of the OMZ (broad mixed layer and upper oxycline zone) and a less extensive OMZ core where oxygen was not as low. Copepod species (including examples from the genera Eucalanus, Pleuromamma, and Lucicutia) demonstrated different distributional strategies and physiologies associated with this variability. We identified sets of species that (1) changed their vertical distributions and depth of maximum abundance associated with the depth and intensity of the OMZ and its oxycline inflection points, (2) shifted their depth of diapause, (3) adjusted their diel vertical migration, especially the nighttime upper depth, or (4) expanded or contracted their depth range within the mixed layer and upper part of the thermocline in association with the thickness of the aerobic epipelagic zone (habitat compression concept). The upper ocean to mesopelagic depth range encompasses a complex interwoven ecosystem characterized by intricate relationships among its inhabitants and their environment. It is a critically important zone for oceanic biogeochemical and export processes and hosts key food web components for commercial fisheries. Among the zooplankton, there will likely be winners and losers with increasing ocean deoxygenation as species cope with environmental change. Changes in individual copepod species abundances, vertical distributions, and life history strategies may create potential perturbations to these intricate food webs and processes. Present day variability provides a window into future scenarios and potential effects of deoxygenation.

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“…Онтогенетические миграции отмечены у ряда крупноразмерных видов копепод, в частности, многих видов семейства Calanidae (Kobari , Ikeda , 2001;Shimode et al, 2009; и др.) и некоторых видов Eucalanidae, в частности, Eucalanus bungii (Shoden et al, 2005), E. inermis (Hidalgo et al, 2005), обитающих, в основном, в высоких широтах, где происходит естественная смена сезонов, и весеннее цветение фитопланктона обеспечивает вторичных консументов пищей. Об указанных видах известно, что в зимний период стадию покоя на больших глубинах претерпевают их старшие копеподиты и самки, поднимаясь к поверхности в теплое время года.…”

Section: вертикальное распределение видов семейства Eucalanidae в слое 0-1000 мunclassified

Вертикальное распределение копепод семейства Eucalanidae (Copepoda: Calanoida) в Аравийском море

Прусова¹

2021

труды

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В данной работе охарактеризованы количественные показатели и вертикальное распределение 10 видов веслоногих раков семейства Eucalanidae (Copepoda: Calanoida) в Аравийском море в слое 0–1000 м на основе зоопланктонных материалов, собранных в рамках программы US JGOFS на акватории между Оманом и Индией севернее 10о с.ш. в весенний межмуссонный период (март–апрель) 1995 г. Выявлено два типа распределения по вертикали в исследованном слое: 1) с преимущественным обитанием видов в эпипелагиали над слоем оксиклина и в верхней переходной зоне (Pareucalanus attenuatus s. l., Subeucalanus mucronatus, S pileatus, S. subcrassus и S. subtenuis) и 2) с нахождением основной массы популяции в пределах слоя минимума кислорода, на глубинах 300–800 м (Eucalanus elongatus, Rhincalanus nasutus, R. rostrifrons, S. crassus, P. smithae). Отмечен факт пространственного разобщения ядер популяций двух близкородственных видов S. subtenuis и S. mucronatus: первый из перечисленных сосредоточен, в основном, в водах с нормальным или пониженным уровнем содержания кислорода, а второй концентрируется в слое оксиклина. На основе анализа возрастной структуры популяций в исследуемом материале сделано предположение о существовании онтогенетических миграций у S. crassus. Выявлено отсутствие выраженных суточных миграций у исследованных видов.

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Annual life cycle of the copepod Eucalanus inermis at a coastal upwelling site off Mejillones (23�S), northern Chile

Cited by 17 publications

References 29 publications

Vertical distribution of Eucalanoid copepods within the Costa Rica Dome area of the Eastern Tropical Pacific

Vertical distribution of Eucalanoid copepods within the Costa Rica Dome area of the Eastern Tropical Pacific

Ocean Deoxygenation and Copepods: Coping with Oxygen Minimum Zone Variability

Вертикальное распределение копепод семейства Eucalanidae (Copepoda: Calanoida) в Аравийском море

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