Life history traits vary between geographically distinct populations in a protogynous hermaphrodite

Kolodzey, Stina; Wing, Stephen R.

doi:10.1002/ecs2.4237

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…Combined with marine heat waves, extensive fine sedimentation has driven a wide‐scale decline in large brown algae, most obviously surface canopies of Macrocystis pyrifera , from all but the oceanic‐influenced entrances of the Sounds over at least the last 50 years (Handley, 2016; Hay, 1990; Tait et al, 2021). In addition to the diffuse effects of land‐based inputs, overharvest, decline, and truncation of the size distributions of sea urchin predators such as red rock lobsters ( J. edwardsii ), blue cod ( P. colias ), and snapper ( P. auratus ) (Davidson et al, 2014; Kolodzey & Wing, 2022) have coincided with the regional proliferation of the sea urchin population. Consequentially, there is a large regional population size of Evechinus , relatively small marine reserve effect sizes, and a near absence of Ecklonia beyond 11‐m depth on rocky reefs.…”

Section: Discussionmentioning

confidence: 99%

The legacies of land clearance and trophic downgrading accumulate to affect structure and function of kelp forests

et al. 2022

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Aotearoa New Zealand is the last major landmass settled by people, and therefore provides a recent record of ecological legacy effects in the coastal zone. Large-scale land clearances of forests accelerated over the last century, affecting the concentration of suspended sediments, light environment, and nutrient composition on rocky reefs, and consequently the distribution, abundance, and composition of algal forests. The environmental effects were compounded in many places by overfishing and long-term declines of large predatory species, often leading to proliferation and extensive grazing by sea urchins. In this study, we examine these processes in three biogeographic regions that have been differentially affected by ecological legacy effects. The study was based on the depth-specific associations between sea urchins (Evechinus chloroticus) and the common kelp (Ecklonia radiata) from multiple sites within each region, some of which were sampled over two decades within no-take marine reserves and in actively fished areas. Satellite-derived estimates of water-column properties were used as proxies for the relative effects of coastal sedimentation on kelp forest habitats. We then used an information-theoretic framework to assess the relative factor weightings of marine reserve effects on urchin density, total suspended solids (TSS), and regional urchin density on the depth-specific density of Ecklonia radiata. The fishing effects were significant within and outside of reserves in the northern and central regions, but the effect sizes were by far strongest in the northern region. In the central region characterized by extensive land clearance and forestry combined with high coastal retention of water, the concentration of TSS had a major influence on the depth distribution of kelp, confining it to shallow water (<10-m depth) in small patches where urchins did not overgraze. These patterns are in sharp contrast to the small marine reserve effects and deep distribution of Ecklonia radiata in the southern region, which has intact native forested catchments, comparatively low fishing pressure, and a large regional network of marine reserves. The results highlight important differences in how centuries-old legacies of land clearance and exploitation affect regional-scale

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Section: Discussionmentioning

confidence: 99%

The legacies of land clearance and trophic downgrading accumulate to affect structure and function of kelp forests

et al. 2022

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Life history traits vary between geographically distinct populations in a protogynous hermaphrodite

Kolodzey

Wing

2022

Ecosphere

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Sequential hermaphroditic species, such as blue cod (Parapercis colias), are particularly vulnerable to selective harvesting as it can directly influence the sex ratio, timing of sex change, and consequentially recruitment success.We analyzed the population structure, at which males dominate the populations, and modeled fecundity of blue cod from the Marlborough Sounds in the north of New Zealand's South Island, and compared these results with previously collected data from a blue cod population in Fiordland on the southwest coast of the South Island. In addition to the geographical difference, there were differences

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Small-scale differences in blue cod length distribution, growth, and trophic ecology in New Zealand

Kolodzey

Stroh

Wing

2023

Mar. Ecol. Prog. Ser.

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Growth and reproduction in marine fish populations can be strongly influenced by local habitat quality and nutritional resources. Habitat degradation can alter prey composition and availability, and, consequently, trophic position and dietary niche breadth of marine fish. In the present study, we compared length-frequency distributions, growth, stomach contents, and isotopic values (δ13C and δ15N) of blue cod Parapercis colias subpopulations from biogenic reef habitats and habitats that were more strongly influenced by shellfish dredges and fine sediment in New Zealand. Blue cod inhabiting more degraded regions were significantly smaller and relied on different prey items than blue cod from biogenic reef habitats. Results indicated that the isotopic niche areas of blue cod occupying degraded habitats were smaller than those of blue cod inhabiting relatively undisturbed biogenic reefs. Isotope mixing models demonstrated that blue cod from one of the biogenic reef regions relied predominantly on suspended particulate organic matter, while blue cod from the other biogenic and degraded regions primarily relied on macroalgae as their organic matter source. Dietary niche overlap was likely higher for blue cod from degraded habitats, with potential consequences for growth and reproduction. Blue cod inhabiting biogenic reefs showed a high degree of individual specialisation. The present study demonstrated that differences in length distribution, growth, and trophic ecology among blue cod subpopulations coincided with differences in habitat degradation. Ecosystem-based management solutions can help regenerate high-quality biogenic habitats while reducing fisheries mortality within these critical habitats.

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Life history traits vary between geographically distinct populations in a protogynous hermaphrodite

Cited by 3 publications

References 47 publications

The legacies of land clearance and trophic downgrading accumulate to affect structure and function of kelp forests

The legacies of land clearance and trophic downgrading accumulate to affect structure and function of kelp forests

Life history traits vary between geographically distinct populations in a protogynous hermaphrodite

Small-scale differences in blue cod length distribution, growth, and trophic ecology in New Zealand

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