Benthic megafaunal community structure of cobalt-rich manganese crusts on Necker Ridge

Morgan, Nicole B.; Cairns, Stephen D.; Reiswig, Henry M.; Baco, Amy R.

doi:10.1016/j.dsr.2015.07.003

Cited by 39 publications

(27 citation statements)

References 52 publications

(71 reference statements)

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“…The increase in species richness with depth on Mokumanamana ( Figure 8A) follows this general trend. Overall, Mokumanamana had high alpha diversity and overall diversity, as described by Shannon-Weaver index, compared to other features within the NWHI at similar depths (Vetter et al, 2010), and were on average similar to the diversity of the Necker Ridge at depths of 1400-1800 m (Morgan et al, 2015). Surface primary productivity is similar on Necker Ridge to Mokumanamana, which may explain their similar levels of diversity despite the depth differences.…”

Section: Environmental Gradients At Fine Scalesmentioning

confidence: 74%

“…It may also lead to large variations in community structure within a single seamount, as each microhabitat on the seamount has the potential to harbor unique communities of benthic invertebrates. Indeed, several recent seamount studies support variability within and among seamount communities related to environmental variation (Baco, 2007;McClain et al, 2010;Bo et al, 2011;Williams et al, 2011;Baco and Cairns, 2012;Long and Baco, 2014;Schlacher et al, 2014;Thresher et al, 2014;McClain and Lundsten, 2015;Morgan et al, 2015;Victorero et al, 2018a;Mejia-Mercado et al, 2019).…”

Section: Introductionmentioning

confidence: 95%

“…Opportunities for intensive investigations of variability in faunal communities and environmental parameters on the scale of a single seamount feature have been rare, but have suggested that there may be significant habitat heterogeneity on individual seamounts, which can be expected to translate into significant variation in community structure and species composition within a single feature (Baco, 2007;McClain et al, 2010;Bo et al, 2011;Long and Baco, 2014;Thresher et al, 2014;Morgan et al, 2015;Victorero et al, 2018a;Mejia-Mercado et al, 2019). The data presented here represent one of the most extensive investigations of a single seamount, with over 150 km of the untrawled seamount Mokumanamana surveyed using an AUV.…”

Section: Environmental Gradients At Fine Scalesmentioning

confidence: 99%

“…and substrate size (based on Wentworth, 1922). Slope and rugosity were quantified from the overall image as a scale from low (value 1) to high (value 4) based on similar methods from Long and Baco (2014) and Morgan et al (2015). Using the imagery, rather than bathymetric data, allows for finer-scale data collection as the bathymetry has a resolution of 60 m while the images have a scale of 3 m. Rugosity also could not be quantified from bathymetry as missing bathymetric data would have been interpolated by downstream analyses.…”

Section: Sampling Strategy and Data Collectionmentioning

confidence: 99%

“…Depth is one of the more prominent parameters influencing assemblage structure (e.g., Howell et al, 2002;Quattrini et al, 2014). Other significant parameters include magnetivity and topography (Boschen et al, 2015), temperature (Mortensen and Buhl-Mortensen, 2004;Wei et al, 2010;Morgan et al, 2015), turbidity (Mamouridis et al, 2011;Brooke et al, 2017), pH (Brooke et al, 2017), oxygen (Wishner et al, 1990;Levin, 2002;De Leo et al, 2017), substrate size and type (Mortensen and Buhl-Mortensen, 2004), and stochastic processes and environmental filtering (Quattrini et al, 2016). Thus, the high habitat heterogeneity that is becoming known on many seamounts, with numerous available habitats, may then contribute to high biodiversity on seamounts.…”

Section: Introductionmentioning

confidence: 99%

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Fine Scale Assemblage Structure of Benthic Invertebrate Megafauna on the North Pacific Seamount Mokumanamana

et al. 2019

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Changes in benthic megafaunal assemblage structure have been found across gradients of environmental variables for many deep-sea habitats, but patterns remain under-investigated on seamounts. To assess the extent of variability in benthic communities at the scale of within a single seamount, and to assess environmental drivers of assemblage changes, Mokumanamana, also known as Necker Island, a seamount in the Papahānaumokuākea Marine National Monument with no known history of human impacts, was surveyed. Replicate 1 km transects were conducted along depth contours at 50 m depth intervals from 200-700 m on three sides of Mokumanamana using the AUV Sentry. Megafaunal abundance and substrate parameters were obtained from 26,119 total images. The dominant megafaunal taxa were sponges, corallimorpharians, cup corals, and benthic ctenophores. Sea pens and alcyonacean octocorals were also abundant. Overall, abundance and diversity of megafauna increased with depth. Beta-diversity through species substitution with depth was very high. Beta-diversity was also high between the sides and likewise defined almost exclusively by species substitution. Crossed ANOSIM by depth and side showed community structure differed on Mokumanamana for both factors. NMDS and cluster analyses of Mokumanamana show nine assemblages that were defined by depth and reflect differences between sides of the seamount. Environmental modeling with DISTLM indicates sediment, oxygen, substrate variability and roughness, POC, and surface currents are correlated with these assemblage differences. These results suggest that microhabitats on seamounts can promote unique assemblages along depth gradients as well as on different sides of a feature, and this diversity may be easily overlooked without fine-scale sampling. These findings have implications for management and conservation of seamounts as well as future ecological studies of seamounts, as seamounts are generally sampled on much coarser spatial scales.

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Section: Environmental Gradients At Fine Scalesmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 95%

Section: Environmental Gradients At Fine Scalesmentioning

confidence: 99%

Section: Sampling Strategy and Data Collectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fine Scale Assemblage Structure of Benthic Invertebrate Megafauna on the North Pacific Seamount Mokumanamana

et al. 2019

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Invertebrate trophic structure on marine ferromanganese and phosphorite hardgrounds

Pereira,

Vlach,

Bradley

et al. 2024

Limnology & Oceanography

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The Southern California Borderland hosts a variety of geologic and oceanographic features that allow for diverse habitats to occur in a restricted region with a strong oxygen minimum zone (OMZ) and hard substrates. These include ferromanganese (FeMn) crusts and phosphorites targeted for deep‐seabed mining in other regions. Baseline studies regarding hardground macro‐ (> 0.3 mm) and megafaunal (> 2 cm) invertebrates are lacking, although they contribute to understanding nutrient cycling and resilience of deep‐sea communities to ocean deoxygenation, fishing, or mineral extraction. With the goal of understanding how substrate type, depth, and dissolved oxygen concentration influence invertebrate trophic structure, we surveyed δ13C and δ15N values of invertebrates on hard substrates on the Southern California Borderland margin along a depth gradient (120–2400 m) through the OMZ at inshore (< 100 km from shore) and offshore (100–250 km from shore) sites, using generalized additive models and community‐level metrics. Macrofaunal isotopic values correlate with substrate type, exhibiting higher trophic diversity on FeMn crusts and specialized communities on phosphorites. Megafaunal isotopic values correlate with proximity to shore; animals offshore seem to depend more on phytoplanktonic production than animals inshore. In general, δ15N increased with decreasing dissolved oxygen and increasing depth, possibly due to remineralization processes within the OMZ and with depth. We discuss how feeding modes and community composition might influence the observed patterns. This study elucidates the importance of the environmental context in shaping invertebrate trophic structure on continental margins and provides baseline knowledge that may be useful in regions where these minerals are targeted for extraction.

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Towards an Ecosystem Approach to Environmental Impact Assessment for Deep-Sea Mining

Thornborough

Juniper

Smith³

et al. 2019

Environmental Issues of Deep-Sea Mining

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Benthic megafaunal community structure of cobalt-rich manganese crusts on Necker Ridge

Cited by 39 publications

References 52 publications

Fine Scale Assemblage Structure of Benthic Invertebrate Megafauna on the North Pacific Seamount Mokumanamana

Fine Scale Assemblage Structure of Benthic Invertebrate Megafauna on the North Pacific Seamount Mokumanamana

Invertebrate trophic structure on marine ferromanganese and phosphorite hardgrounds

Towards an Ecosystem Approach to Environmental Impact Assessment for Deep-Sea Mining

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