Life history and population maintenance strategies of<i>Calanoides carinatus</i>(Copepoda: Calanoida) in the southern Benguela ecosystem

Verheye, HM; Hutchings, L.; Peterson, William T.

doi:10.2989/025776191784287600

Cited by 58 publications

(35 citation statements)

References 14 publications

(27 reference statements)

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“…In upwelling systems the local maintenance of copepod populations seems to depend upon seasonal (ontogenetic) and/or diurnal migrations (Verheye et al 1991, Angel 1994. The resolution of our sampling scheme did not allow us to distinguish diurnal vertical migrations.…”

Section: Life Cycle O F Calanus Chilensis and Centropages Brachiatus mentioning

confidence: 99%

Distribution and life cycle of Calanus chilensis and Centropages brachiatus (Copepoda) in Chilean coastal waters:a GIS approach

González¹,

Marı́n²

1998

Mar. Ecol. Prog. Ser.

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Calanus chilensis and Centropages brachiatus are 2 of the most abundant species of copepods (Crustacea) off the Chilean coast. However, knowledge of their life cycle and distribution is fragmentary. We have analysed the distnbution of both species in Chilean coastal waters by means of a Geographic Information System (ARC/INFO). We studied vertically integrated (0 to 100 m) zooplankton samples and ancdlary physical oceanographic data collected during 1989 by the Instituto de Fomento Pesquero, Chlle. Point estimates of abundance and physical data were transformed to a grid format in ARCANFO. We show that both species are abundant within 10 km from shore, and that high abundances further offshore may be interpreted as the result of advection. We also show that both species remain year-round in the upper water column with no evidence of seasonal vertical nugration. We then discuss potential Me cycle mechanisms that might explain their dominance in the coastal area of the Humboldt Current ecosystem.

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Section: Life Cycle O F Calanus Chilensis and Centropages Brachiatus mentioning

confidence: 99%

Distribution and life cycle of Calanus chilensis and Centropages brachiatus (Copepoda) in Chilean coastal waters:a GIS approach

González¹,

Marı́n²

1998

Mar. Ecol. Prog. Ser.

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“…Peterson (Peterson, 1998) first suggested that different subpopulations of C. natalis might exist along the West African coast arising from its ability to maintain itself within upwelling systems. Calanoides natalis undergoes ontogenetic vertical migration, which allows survival during non-upwelling periods and thus low food availability (Verheye et al, 1991). In the Benguela system, the northwestward drift of the active surface population in the Ekman layer may be compensated by the southward flow of diapause stages within the poleward undercurrent (Timonin, 1997;Peterson, 1998;Auel and Verheye, 2007).…”

Section: Introductionmentioning

confidence: 99%

Population genetic structure of Calanoides natalis (Copepoda, Calanoida) in the eastern Atlantic Ocean and Benguela upwelling system

Höring¹,

Cornils²,

Auel³

et al. 2017

Journal of Plankton Research

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The population genetic structure of Calanoides natalis (ex Calanoides carinatus; Copepoda, Calanoida), an ecologically important component of African upwelling systems, was studied in order to (i) search for potential cryptic species, (ii) describe spatial patterns in the distribution of genetic variance and (iii) identify potential barriers to gene flow. Samples were obtained in the eastern Atlantic Ocean from the Iberian Peninsula to Namibia. Analysis of mitochondrial (cytochrome c oxidase subunit I; COI) and nuclear (citrate synthase; CS) marker genes revealed a genetically cohesive population of C. natalis with a prevalent shift in allele frequencies. The discovery of a deep split solely present in the mitochondrial dataset does not point to cryptic speciation, but rather suggests the occurrence of nuclear mitochondrial pseudogenes or incomplete reproductive isolation upon secondary contact. Genetic differentiation between the northern and southern hemisphere was significant, which may point to a potential, but permeable barrier close to the equator. No vertical genetic structuring was detected in the northern Benguela implying that horizontal differentiation was more pronounced than vertical structuring. Retention mechanisms and the oxygen minimum zone did not have a strong impact on genetic differentiation of C. natalis in the Benguela region.

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“…A greater relative abundance of smaller individuals over the midshelf than inshore was also reported by Masson (1972), Hopson (1983) and Gibbons (in press), although an unknown number of specimens in the samples of Hopson may have been S. minima. Both the euphausiid Euphausia lucens (Pillar et al 1989) and the copepod Calanoides carinatus (Verheye et al 1991) display a similar cross-shelf distribution of maturity and size during upwelling conditions. This is thought to be the product of the interaction between ontogenetic layering (whereby younger developmental stages show limited vertical migration and are generally confined to more superficial depths than adults) and wind-driven Ekman transport.…”

Section: Resultsmentioning

confidence: 99%

“…The feeding and vertical migration of the most abundant chaetognath in the southern Benguela, Sagitta friderici (also referred to as Parasagitta friderici ;Bieri 1991), is presented here from data collected at two 24-h anchor-stations in the southern Benguela during October 1987. The results of this spring study are then compared with those generated from similar winter (May 1984, Stuart andVerheye 1991) and summer (February 1991, Gibbons in press) studies. In the absence of extant, published monthly data sets, these separate studies allow for the construction of a fuller description of the biology and ecology of S. friderici in the southern Benguela.…”

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confidence: 99%

Feeding and vertical migration of the chaetognathSagitta friderici(Ritter-Zahony, 1911) in the southern Benguela during spring 1987, with notes on seasonal variability of feeding ecology

Gibbons¹,

Stuart²

1994

South African Journal of Marine Science

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The feeding biology and the vertical migration of Sagitta friderici were examined over 24 h at two stations in the southern Benguela during spring (October) 1987. Together with studies conducted during summer (February 1991) and winter (May 1984), they serve to allow valuable generalizations of the biology and ecology of this abundant chaetognath. Populations migrate vertically and feed nocturnally, although the timing and the extent of migration vary between studies. S. friderici exhibits ontogenetic layering and the cross-shelf distribution of maturity stages differs, suggesting that it is able to take advantage of cross-shelf water movement in order to maintain populations in the nearshore waters of the West Coast. S. friderici prey almost exclusively on copepods (cannibalism is rare), and there is a positive relationship between the lengths of predator and prey that is influenced by the size structure of the prey environment. This casts doubt on the validity of a chaetognath species-specific relationship between predator and prey size. S. friderici selects its prey on the basis of size, and not species. Daily ration is related linearly to prey density, so reflecting the low density of prey and providing support for theoretical predictions regarding ingestion rates under oceanic conditions. The impact of S. friderici predation on the copepod assemblage is generally less than 3% of the standing stock, although it could be much higher under conditions of low copepod biomass and poor secondary production.Die voedingsbiologie en die vertikale migrasie van Sagitta friderici is oor 24 h by twee stasies in die suidelike Benguela gedurende lente (Oktober) 1987 ondersoek. Tesame met studies wat gedurende somer (Februarie 1991) en winter (1 Mei 1984) gedoen is, is dit moontlik om waardevoile veralgemenings oor die biologie en ekologie van hierdie volop chetognaat te maak. Bevolkings migreer vertikaal en vreet snags ofskoon die tydsberekening en die omvang van migrasie tussen studies wissel. S. friderici vertoon ontogenetiese laagvorming en die verspreiding van rypheidstadia verskil in die dwarste oor die plat, wat daarop dui dat dit in staat is om waterbeweging oor die breedte van die plat te benut om bevolkings in die aanlandige waters van die Weskus te handhaaf. S. friderici maak byna uitsluitlik op kopepodes jag (kannibalisme is skaars), en daar is 'n positiewe verband tussen die lengtes van roofdier en prooi wat bei'nvloed word deur die groottestruktuur van die prooi-omgewing. Dit wek onsekerheid oor die geldigheid van 'n verband tussen die groottes van roofdier en prooi wat eie aan elke chetognaatspesie is. S. friderici soek sy prooi uit met grootte as grondslag, en nie spesie nie. Daaglikse rantsoen hou linelr verband met prooidigtheid en weerspieel sodoende die lae digtheid van die prooi en verleen steun aan teoretiese voorspellings aangaande innamekoerse onder oseaniese omstandighede. S. friderici verwyder oor die algemeen minder as 3% van die biomassa teenwoordig, ofskoon dit veel meer kan wees as die kopepo...

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Life history and population maintenance strategies ofCalanoides carinatus(Copepoda: Calanoida) in the southern Benguela ecosystem

Cited by 58 publications

References 14 publications

Distribution and life cycle of Calanus chilensis and Centropages brachiatus (Copepoda) in Chilean coastal waters:a GIS approach

Distribution and life cycle of Calanus chilensis and Centropages brachiatus (Copepoda) in Chilean coastal waters:a GIS approach

Population genetic structure of Calanoides natalis (Copepoda, Calanoida) in the eastern Atlantic Ocean and Benguela upwelling system

Feeding and vertical migration of the chaetognathSagitta friderici(Ritter-Zahony, 1911) in the southern Benguela during spring 1987, with notes on seasonal variability of feeding ecology

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