Reproductive sources and sinks within a sea urchin, Evechinus chloroticus, population of a New Zealand fjord

Wing, Stephen R.; Gibbs, Mark T.; Lamare, Miles D.

doi:10.3354/meps248109

Cited by 54 publications

(50 citation statements)

References 35 publications

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“…Estuarine circulation (see 'Introduction') is common to all the fjords, but will vary among fjords due to variation in freshwater input and bathymetry (Stanton & Pickard 1981, Stanton 1984, Gibbs et al 2000. Thus, the low salinity layer places controls on circulation and the transport of passive larvae within the fjord (Wing et al 2003). Echinoderm larvae are sensitive to low salinities (Stickle & Diehl 1987), and would either avoid them or die if exposed to low salinity for prolonged periods.…”

Section: Discussionmentioning

confidence: 99%

Genetic subdivision of a sea star with high dispersal capability in relation to physical barriers in a fjordic seascape

Sköld¹,

Wing²,

Mladenov³

2003

Mar. Ecol. Prog. Ser.

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We used allozymes to investigate the population genetics of the sea star Coscinasterias muricata throughout New Zealand, with emphasis on populations inhabiting the fjords on the west coast of the South Island. Mean genetic variability measured by Wright's F st for all the New Zealand populations was 0.061, indicating a moderate level of genetic divergence on a New Zealand wide scale. F st for populations from the fjord region was generally lower, ranging from 0.024 to 0.028, but it deviated from zero for all the loci examined. Evidence of isolation by distance was found when all populations were used in an analysis of log of the extent of gene flow between a pair of populations (M ) against the log of geographic distance (r 2 = 0.57, p < 0.001, Mantel test). Thus, a pattern of isolation by distance seems evident on this larger scale. However, pair-wise comparisons of genetic distances, measured as F st , of populations on the regional scale of the fjords on the west coast of the South Island showed no correlation, since high variation of F st (0.001 to 0.09) between populations separated by 20 to 105 km was detected. The overall pattern of genetic variation revealed in a cluster analysis of genetic identity, I, grouped all the fjord populations together with maximum genetic identities of 94.6% to the other South Island populations, but within the fjord region, populations were not segregated according to geographical location. We suggest that the relatively isolated hydrography of each fjord is a most likely explanation for why fjord populations form genetic clusters that are inconsistent with geographical distance. The New Zealand fjords changed from freshwater systems about 12 000 to 6500 yr ago, and genetic equilibrium for the populations that colonized the fjords may not have been reached yet. We suggest that the recent colonization of the fjords, and the physical isolation from the open coast and each other, are important in explaining the genetic pattern of fjord populations of C. muricata.

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Section: Discussionmentioning

confidence: 99%

Genetic subdivision of a sea star with high dispersal capability in relation to physical barriers in a fjordic seascape

Sköld¹,

Wing²,

Mladenov³

2003

Mar. Ecol. Prog. Ser.

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“…Labrids are one of the most abundant and conspicuous reef fish families within New Zealand (Denny 2005) and have been observed to feed primarily on sea urchins Evechinus chloroticus, mollusks and crustaceans (Russell 1983, Jones 1984b, Denny & Schiel 2001. Sea urchins are regulators of algal density (Choat & Schiel 1982) and exist over a range of environments (Wing et al 2003), which suggests that via predation wrasses may help maintain algal communities valuable to other species for shelter and food (Schiel & Hickford 2001). Additionally, predation by wrasses on mussels in southern New Zealand likely provides significant top down control in structuring ecological communities on shallow temperate reefs (Rilov & Schiel 2006, Wing & Leichter 2011.…”

Section: Study Speciesmentioning

confidence: 99%

Niche partitioning in the Fiordland wrasse guild

Davis¹,

Wing²

2012

Mar. Ecol. Prog. Ser.

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Niche space is a useful indicator of trophic diversity in marine ecosystems. Here we describe the characteristics of realized niche space of 3 sympatric labrids (Notolabrus celidotus, Notolabrus fucicola, and Pseudolabrus miles) in Fiordland, New Zealand. We investigate physical niche through relationships between environmental parameters and patterns in abundance at a regional scale. Abundances of P. miles and N. fucicola were best associated with high salinity, wave-exposed areas (r 2 = 0.637, 0.372 respectively) while N. celidotus was positively correlated with calm semi-estuarine conditions (r 2 = 0.452). Variation in biological habitat descriptors of wrasse abundance provided evidence for differences in the environmental correlates for abundance among species, though all were positively correlated with abundance of macroalgae (Ecklonia radiata). Stable isotope analysis identified individual variability in trophic position among species by revealing that P. miles fed at a significantly higher trophic level and had a higher percentage of macroalgae in their composition of basal organic matter than N. celidotus and N. fucicola. N. celidotus had a significantly higher dispersion of individual trophic levels and percentage macroalgae than P. miles and N. fucicola, indicating a broader trophic niche. Isotopic results were supported by prey choices identified in gut content analysis and qualitative observations of tooth morpho logy. In Fiordland, N. celidotus is a generalist species, successfully exploiting a range of resources along the gradient from inner to outer fjord habitat, while P. miles and N. fucicola are relatively specialized to wave-exposed coastal habitats. These methods provide a useful approach to the quantitative comparison of niche breadth among species.

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“…This implies that the dolphins forage opportunistically as they move through the fiord, 'grazing' on available prey. Such patterns may reflect the fiord's characteristically low productivity (Wing et al 2001(Wing et al , 2003 and sparse fish resources (Lusseau & Wing 2006). Other studies indicate that bottlenose dolphins are, in general, opportunistic predators with diets reflecting available food resources (e.g.…”

Section: Foraging Patternsmentioning

confidence: 99%

Acoustic monitoring of habitat use by bottlenose dolphins in Doubtful Sound, New Zealand

Elliott

Dawson

Henderson

2011

New Zealand Journal of Marine and Freshwater Research

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Passive acoustic methods are increasingly used to study cetacean habitat use and behaviour. The Timing Porpoise Detector (T-POD; www.chelonia.co.uk) is a self-contained acoustic data logger, which records echolocation by cetaceans. This study used nine T-PODs to document habitat use by bottlenose dolphins in Doubtful Sound, New Zealand, over a 12-month period, collecting data over 76,104 h (of a possible 78,840). T-POD records show that dolphin distribution varied seasonally, with inner fiord sites being used most often in summer and autumn, and outer fiord sites during winter and spring. This seasonal pattern was positively correlated with surface water temperature. Echolocation activity in general and buzzes, which are usually indicative of foraging, were both significantly more common during dawn and/or dusk, suggesting crepuscular foraging. T-POD data suggest that parts of the 'Dolphin Protection Zone', in which boat traffic is restricted, are used frequently while other parts are not, and provide a basis for refining this management tool.

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Reproductive sources and sinks within a sea urchin, Evechinus chloroticus, population of a New Zealand fjord

Cited by 54 publications

References 35 publications

Genetic subdivision of a sea star with high dispersal capability in relation to physical barriers in a fjordic seascape

Genetic subdivision of a sea star with high dispersal capability in relation to physical barriers in a fjordic seascape

Niche partitioning in the Fiordland wrasse guild

Acoustic monitoring of habitat use by bottlenose dolphins in Doubtful Sound, New Zealand

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