Effects of warm water intrusions on populations of macrozooplankton on Georges Bank, Northwest Atlantic

Brown, Harmon; Bollens, Stephen M.; Madin, Laurence P.; Horgan, Erich

doi:10.1016/j.csr.2004.07.028

Cited by 12 publications

(13 citation statements)

References 30 publications

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“…if there is a self-sustaining, reproducing population. Neomysis americana occurs in the North Atlantic from 468N along Canadian and USA coastal waters (Hulburt, 1957;Herman, 1963;Williams, 1972;Williams et al, 1974;Prouse, 1986;Brown et al, 2005), but it is not reported for Central America or northern South American waters. It was first cited for South America in Montevideo Harbour, Uruguay (358S: González, 1974), and since then it has been found in other Uruguayan sites (Calliari et al, 2001(Calliari et al, , 2007Rodriguez-Graña et al, 2008), in southern Brazil (Tramandaí and Lagoa dos Patos, 308-328S: Tavares & Bond-Buckup, 1990; Gama, 2008) south-west atlantic mysids geographical distribution and Argentina (368 -408S, Hoffmeyer, 1990;Viñas et al, 2005).…”

Section: Discussionmentioning

confidence: 94%

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Revision of mysids (Crustacea: Peracarida: Mysida) zoogeographical distribution in the south-west Atlantic (0° to 40°S)

Miyashita

Calliari

2014

Mar. Biodivers. Rec.

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We revised the zoogeographical distribution of mysids in the south-west Atlantic, from northern Brazil to Argentina (08 to 408S), providing body length, and temperature and salinity range of occurrence for each species. All information concerning mysids from the south-west Atlantic was obtained from published/unpublished studies. Of currently 1128 mysids species described worldwide, only 31 were recorded in the south-west Atlantic which are distributed in 14 genera, 6 subfamilies and one family. This extremely low number of recorded species highlights the need for further studies focusing on mysids in the south-west Atlantic.

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Section: Discussionmentioning

confidence: 94%

“…North American Atlantic coast (Hulburt, 1957;Herman, 1963;Wigley & Burns, 1971;Williams, 1972;Williams et al, 1974;Zagursky & Feller, 1985;Prouse, 1986;Brown et al, 2005;Taylor et al, 2005; and references therein; authors' own unpublished data); and Holland (Wittmann et al, 2012).…”

Section: Othersmentioning

confidence: 94%

Revision of mysids (Crustacea: Peracarida: Mysida) zoogeographical distribution in the south-west Atlantic (0° to 40°S)

Miyashita

Calliari

2014

Mar. Biodivers. Rec.

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“…The co-occurrence of Phronima and Salpa spp. in the Georges Bank, Northwest Atlantic is well known (Brown et al 2005).…”

Section: Relation Between Hyperiid Amphipods and Salpsmentioning

confidence: 99%

Seasonal variation in hyperiid amphipod abundance and diversity and influence of mesoscale structures off Baja California

Lavaniegos

Hereu²

2009

Mar. Ecol. Prog. Ser.

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Hyperiid amphipods collected during 4 IMECOCAL (Spanish acronym for Mexican Investigations of the California Current) cruises in January, April, July, and October 2005 were analyzed for seasonal variation in abundance and diversity and to determine the influence of surface circulation. The number of species was high in all seasons (between 79 and 92), but abundances showed remarkable differences. The total number of amphipods was lowest in January and highest in October (geometric means were 82 and 606 ind. 1000 m -3 respectively). Multivariate analysis based on similarity indices demonstrated a tight coupling between species composition and mesoscale structures. The largest cluster joined 67 stations, with 40% of similarity being explained by 4 species (Vibilia armata, Lestrigonus schizogeneios, Eupronoe minuta, and Primno brevidens). The geographic position of these stations coincided with the main California Current (CC) flow from spring to autumn. Subgroups were defined by minor seasonal differences. In contrast, the CC flow during winter was reduced to a meander off north Baja California, and was surrounded by oligotrophic water as indicated by the presence of the hyperiids Anchylomera blossevillei and Phrosina semilunata plus 3 of the dominant species (V. armata, E. minuta, and P. brevidens). To the south of this front, other clusters with high oceanic influence were formed. In 2005, 3 eddies were detected in the area: one anticyclonic eddy in April and 2 cyclonic eddies in July. The anticyclonic eddy located in the southwest had its own faunal cluster that had high diversity but low population density. The main species in the anticyclonic eddy was Platyscelus ovoides. Only one of the cyclonic eddies had a unique faunal identity, being strongly dominated by Vibilia armata; this was located in the north between the CC flow and the coast. The other eddy was large and situated in the middle of the area, with a faunal array analogous to that in the CC flow. Correlation between hyperiid and salp species abundances suggested that the increase in salps (Salpa fusiformis, Thalia orientalis, Cyclosalpa bakeri) in spring could be relevant, as many hyperiid species showed a strong increase at this time. However, the most correlated salp was Cyclosalpa danae, which occurred only in October. Chains of C. danae aggregates were firmly attached in the samples. This would promote the aggregation and survival of amphipod hosts, particularly small species such as Lestrigonus schizogenios and L. bengalensis.

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“…Additionally, the warm water intrusions in 1995 could have advected slope water predators onto Georges Bank (Brown et al 2005), thereby increasing overall predation rates, as well as rates on the flank.…”

Section: Predationmentioning

confidence: 99%

“…Many of the invertebrate predators were sampled during the GLOBEC GB study with a 10 m 2 MOCNESS (Brown et al 2005). First, the fraction of tows found containing each predatory taxon was used to test if there was a significant difference in the presence of each taxon between years.…”

Section: Predationmentioning

confidence: 99%

Modeling the processes affecting larval haddock (Melanogrammus aeglefinus) survival on Georges Bank

Petrik¹

2011

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The ultimate goal of early life studies of fish over the past century has been to better understand recruitment variability. Recruitment is the single most important natural event controlling year-class strength and biomass in fish populations. As evident in Georges Bank haddock, Melanogrammus aeglefinus, there is a strong relationship between recruitment success and processes occurring during the planktonic larval stage. Spatially explicit coupled biological-physical individual-based models are ideal for studying the processes of feeding, growth, and predation during the larval stage. This thesis sought new insights into the mechanisms controlling the recruitment process in fish populations by using recent advances in biological-physical modeling methods together with laboratory and field data sets. Interactions between feeding, metabolism and growth, vertical behavior, advection, predation, and the oceanic environment of larval haddock were quantitatively investigated using individual-based models. A mechanistic feeding model illustrated that species-specific behavioral characteristics of copepod prey are critically important in determining food availability to the haddock larvae. Experiments conducted with a one-dimensional vertical behavior model suggested that larval haddock should focus on avoiding visual predation when they are small and vulnerable and food is readily available. Coupled hydrodynamics, concentration-based copepod species, and individual-based larval haddock models demonstrated that the increased egg hatching rates and lower predation rates on larvae in 1998 contributed to its larger year-class. Additionally, results from these coupled models imply that losses to predation may be responsible for interannual variability in recruitment and larval survival. The findings of this thesis can be used to better manage the haddock population on Georges Bank by providing insights into how changes in the physical and biological environment of haddock affect their survival and recruitment, and more generally about the processes significant for larval fish survival.

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Effects of warm water intrusions on populations of macrozooplankton on Georges Bank, Northwest Atlantic

Abstract: As part of the Georges Bank/North West Atlantic GLOBEC (Global Ocean Ecosystems Dynamics) Program, macrozooplankton and micronekton were collected on 30Broad Scale Survey Cruises between January -June, 1995-1999

Cited by 12 publications

References 30 publications

Revision of mysids (Crustacea: Peracarida: Mysida) zoogeographical distribution in the south-west Atlantic (0° to 40°S)

Revision of mysids (Crustacea: Peracarida: Mysida) zoogeographical distribution in the south-west Atlantic (0° to 40°S)

Seasonal variation in hyperiid amphipod abundance and diversity and influence of mesoscale structures off Baja California

Modeling the processes affecting larval haddock (Melanogrammus aeglefinus) survival on Georges Bank

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