Mesopelagic faunal transition across the Subtropical Convergence east of New Zealand

Robertson, D. A.; Roberts, P. E.; Wilson, J. Bastow

doi:10.1080/00288330.1978.9515757

Cited by 65 publications

(35 citation statements)

References 28 publications

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“…Results indicate that richness is generally lower in warmer and/or more-saline waters than in cooler less-saline waters, provided that the latter occur in reasonable proximity to zones of water mixing. Similar differences in regional-scale richness were described for meso-pelagic organisms in the waters north and south of the STF by Robertson et al (1978).…”

Section: Links Between Species Richness and Environmentsupporting

confidence: 75%

Variation in demersal fish species richness in the oceans surrounding New Zealand: an analysis using boosted regression trees

Leathwick¹,

Elith²,

Francis³

et al. 2006

Mar. Ecol. Prog. Ser.

486

366

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We analysed relationships between demersal fish species richness, environment and trawl characteristics using an extensive collection of trawl data from the oceans around New Zealand. Analyses were carried out using both generalised additive models and boosted regression trees (sometimes referred to as 'stochastic gradient boosting'). Depth was the single most important environmental predictor of variation in species richness, with highest richness occurring at depths of 900 to 1000 m, and with a broad plateau of moderately high richness between 400 and 1100 m. Richness was higher both in waters with high surface concentrations of chlorophyll a and in zones of mixing of water bodies of contrasting origins. Local variation in temperature was also important, with lower richness occurring in waters that were cooler than expected given their depth. Variables describing trawl length, trawl speed, and cod-end mesh size made a substantial contribution to analysis outcomes, even though functions fitted for trawl distance and cod-end mesh size were constrained to reflect the known performance of trawl gear. Species richness declined with increasing cod-end mesh size and increasing trawl speed, but increased with increasing trawl distance, reaching a plateau once trawl distances exceed about 3 nautical miles. Boosted regression trees provided a powerful analysis tool, giving substantially superior predictive performance to generalized additive models, despite the fitting of interaction terms in the latter.

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Section: Links Between Species Richness and Environmentsupporting

confidence: 75%

Variation in demersal fish species richness in the oceans surrounding New Zealand: an analysis using boosted regression trees

Leathwick¹,

Elith²,

Francis³

et al. 2006

Mar. Ecol. Prog. Ser.

486

366

View full text Add to dashboard Cite

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“…35 Most shallower and middle-depth common species were found on both sides of the STF. This is in contrast to mesopelagic species on the Chatham Rise for which the STF serves as a discontinuity for c. 70% of species (Robertson et al 1978). This may reflect differences in prey species requirements at different trophic levels.…”

Section: Discussionmentioning

confidence: 77%

“…If a smaller mesh size was used, then some smaller fish, such as myctophids-abundant meso-pelagic fish also found near the bottom during the day (Robertson et al 1978) -might also have featured as important species within the observed fish community. Even among species retained by the cod-end, species catch rates will have been affected by differences in catchability.…”

Section: Discussionmentioning

confidence: 99%

“…Robertson et al (1978Robertson et al ( , 1979 described the mesopelagic fauna of the Chatham Rise and their association with water masses north and south of the STF. More recently, McClatchie et al (1997) described fish diversity, species richness, and evenness on the Chatham Rise and in the subantarctic south of New Zealand in relation to depth, latitude, and regional surface productivity.…”

Section: Introductionmentioning

confidence: 99%

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Upper‐slope fish communities on the Chatham Rise, New Zealand, 1992–99

Bull¹,

Livingston

Hurst

et al. 2001

New Zealand Journal of Marine and Freshwater Research

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Catch rate data for fish species caught in 200-800 m depths during summer trawl surveys of the Chatham Rise to the east of New Zealand in 1992-99 were explored to assess community structure and species associations and to identify changes that occurred within the time series of surveys. The community was dominated by hoki (Macruronus novaezelandiae Hector), a Southern Hemisphere merlucciid hake, which was more abundant than all other species combined and occurred at 97% of the 1048 trawl stations. Three groupings offish species were identified on the basis of descriptive and cluster analyses, associated with the 200-350, 350-550, and 550-800 m depth ranges. Redundancy analysis showed that depth, latitude, and to a lesser extent longitude explained most of the variation in abundance and composition of catches. Spatial patterns in species diversity and fish density were investigated. Trends within the time series show a significant decline in the biomass of hoki and changes in biomass of several other abundant species. However, there was little change in diversity, density, or division into groupings. The changes in abundance may be related to increased fishing activity and/or other factors such as changes in catchability because of the rising bottom temperatures observed during the surveys. M00060

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“…1). The Subtropical Convergence is a major barrier for many species (Robertson et al 1978) and may restrict gene flow in species which bisect the convergence, for example the frequency of orange roughy mtDNA haplotypes differ significantly among population samples north and south of the convergence (Smith et al 1996).…”

Section: Discussionmentioning

confidence: 99%

Allozyme variation in scampi (Metanephrops challengeri) fisheries around New Zealand

Smith

1999

New Zealand Journal of Marine and Freshwater Research

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Scampi (Metanephrops challengeri Balss, 1914) support a significant fishery in New Zealand waters. Allozyme analysis of samples from four fishery areas found a low level of genetic variation but significant heterogeneity in allele frequencies. There were significant differences between samples from the Auckland Island Shelf and those from mainland New Zealand at three loci, but only one locus showed heterogeneity among mainland samples.

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Mesopelagic faunal transition across the Subtropical Convergence east of New Zealand

Cited by 65 publications

References 28 publications

Variation in demersal fish species richness in the oceans surrounding New Zealand: an analysis using boosted regression trees

Variation in demersal fish species richness in the oceans surrounding New Zealand: an analysis using boosted regression trees

Upper‐slope fish communities on the Chatham Rise, New Zealand, 1992–99

Allozyme variation in scampi (Metanephrops challengeri) fisheries around New Zealand

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