Distribution of the New Zealand scallop (<i>Pecten novaezealandiae</i>) within and surrounding a customary fisheries area

Twist, Brenton A.; Hepburn, Christopher D.; Rayment, William

doi:10.1093/icesjms/fsv228

Cited by 3 publications

(2 citation statements)

References 84 publications

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“…Other studies with similar count data have used NB regression (e.g. White & Bennetts, 1996; Twist, Hepburn & Rayment, 2016). All analyses were carried out in RStudio (version 4.0.0; R Core Team, 2020).…”

Section: Methodsmentioning

confidence: 99%

Small marine reserves provide conservation benefits for coastal sharks in southern New Zealand

Heldsinger

Hepburn

Jowett

et al. 2022

Aquatic Conservation

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With the increasingly imperilled status of shark populations, there is a pressing need to evaluate management solutions. Given the threats posed by fishing, marine reserves (MRs) present a promising option. Ata Whenua (Fiordland) in the South Island of Aotearoa/New Zealand is an ideal location to investigate this phenomenon owing to the presence of several shark species in coastal MRs. One‐hundred and sixty‐seven baited remote underwater video deployments were made in five MRs. A multi‐model inference approach using generalized linear modelling was used to assess the combined effect of the MRs on two trophic groups of coastal sharks. Generalized linear modelling was used to assess the effect of protection on, firstly, the presence of broadnose sevengill sharks (Notorynchus cepedianus), while accounting for variations in environmental variables, and secondly, the combined relative abundance of mesopredatory sharks detected (spiny dogfish, Squalus acanthias; school shark, Galeorhinus galeus; and carpet shark, Cephaloscyllium isabellum). Mesopredators had a higher relative abundance in MRs by a factor of 2.5 and there was a strong significant effect of protection, suggesting that MRs have led to an increase in their abundance or a change in distribution. In contrast, there was no effect of protection detected for sevengill sharks. It is concluded that the relatively small (<40 km2) MRs sampled do not provide conservation benefits for a large, mobile shark, but that they are potentially large enough to offer protection for mesopredatory sharks with smaller home ranges. To be effective for shark conservation, we therefore recommend that MRs need to be appropriately sized for the ranging behaviour of the target species for protection.

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Section: Methodsmentioning

confidence: 99%

Small marine reserves provide conservation benefits for coastal sharks in southern New Zealand

Heldsinger

Hepburn

Jowett

et al. 2022

Aquatic Conservation

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“…Smoothing curves derived from the best GAM(M)s in each set were used to interpret the effect of each explanatory variable on habitat use. The relative importance of each predictor variable was examined by summing the Akaike weights for each model that included the predictor variable (Burnham & Anderson, 2002; Twist et al, 2016). We were not able to evaluate lagged relationships between oceanography and whale distribution, due to our oceanographic sampling being based on water‐column data collected in situ at specific whale presence and absence locations.…”

Section: Methodsmentioning

confidence: 99%

Fine‐scale habitat use of foraging sperm whales is driven by seafloor topography and water column structure

Guerra

Dawson

Somerford

et al. 2021

Marine Mammal Science

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Knowledge of the spatial distribution and habitat preferences of marine top‐predators is essential for monitoring their populations. The summertime abundance of male sperm whales (parāoa, Physeter macrocephalus) at the Kaikōura Canyon (New Zealand) has almost halved over the last three decades, possibly reflecting a shift in distribution away from this foraging ground. To better understand the seasonal drivers of habitat use by sperm whales, we recorded presence and absence locations of foraging whales during acoustic‐visual surveys, in conjunction with water‐column oceanographic sampling. Season‐specific generalized additive models (GAM) indicated that whale distribution was best predicted by seafloor depth, thermal stratification in the water‐column, and slope gradient and orientation. Habitat use differed between summer and winter, consistent with patterns in diving behavior and stable isotope ratios, suggesting seasonal fluctuations in prey targeted by sperm whales. Our results advance understanding of fine‐scale habitat use by sperm whales, with new insights into the ecological drivers of seasonal fluctuations in foraging distribution. Our study demonstrates the importance of quantifying water‐column processes in the study of habitat preferences by deep‐diving predators. We also identify thermal stratification as an oceanographic feature susceptible to climate change, which could contribute to the decline in sperm whale abundance at Kaikōura.

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Locating Great White Shark Tourism in Gansbaai, South Africa Within the Global Shark Tourism Economy

McKay

2019

New Directions in South African Tourism Geographies

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Distribution of the New Zealand scallop (Pecten novaezealandiae) within and surrounding a customary fisheries area

Cited by 3 publications

References 84 publications

Small marine reserves provide conservation benefits for coastal sharks in southern New Zealand

Small marine reserves provide conservation benefits for coastal sharks in southern New Zealand

Fine‐scale habitat use of foraging sperm whales is driven by seafloor topography and water column structure

Locating Great White Shark Tourism in Gansbaai, South Africa Within the Global Shark Tourism Economy

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