@article {Levin2017,
	title = {{Methane seepage effects on biodiversity and biological traits of macrofauna inhabiting authigenic carbonates}},
	journal = {Deep Sea Research Part II: Topical Studies in Oceanography},
	volume = {137},
	year = {2017},
	pages = {26{\textendash}41},
	abstract = {Authigenic carbonate rocks at methane seeps are recognized as hosting diverse and abundant invertebrate assemblages, with potential forcing from fluid seepage and hydrography. Mensurative studies of carbonate macrofauna ({\textgreater}0.3 mm) at Hydrate Ridge, OR revealed little effect of water depth and overlying oxygenation (at 600 m and 800 m) but a large influence of seepage activity on density, taxonomic composition, diversity, and biological traits (feeding, lifestyle, motility, size and calcification). Rocks exposed to active seepage had 3{\textendash}4{\texttimes} higher total macrofaunal densities than under inactive conditions. Assemblages exhibited higher species richness and reduced evenness (greater dominance) under active seepage than inactive conditions, but no difference in H' or rarefaction diversity. Actively seeping sites were characterized by errant (motile), bacterial grazing, small- and medium-sized, heavily calcified species, whereas inactive sites exhibited a greater diversity of feeding modes and more burrowers, sessile, large and lightly calcified species. Active rocks supported more exogonid (Syllidae), ampharetid, and cirratulid polychaetes, provannid snails, pyropeltid limpets, nemerteans, and sponges; whereas inactive rocks supported higher densities of ophiuroids, isopods, gammarid amphipods, hydroids, Typosyllis (Syllidae) and tanaids. Transplant experiments, in which rocks were transferred between active and inactive sites at Hydrate Ridge North (600 m), revealed that assemblages respond within 13 months to increase or cessation of seepage, taking on the feeding, size and calcification characteristics of the background fauna at the new site. Lifestyles and motility patterns shifted more slowly as the sessile, attached species did not track seepage as quickly. Provannid snails and pyropeltid limpets rapidly colonized rocks transplanted to active sites and disappeared when transplanted to inactive sites. Given the known variability of fluid fluxes and rapid community response, a mosaic of communities changing in space and time is hypothesized to generate the relatively high species diversity at methane seeps.},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	doi = {10.1016/j.dsr2.2016.05.021},
	author = {Levin, L A and Mendoza, G F and Grupe, B M}
}
@article {Levin2010,
	title = {{Diversity of bathyal macrofauna on the northeastern Pacific margin: the influence of methane seeps and oxygen minimum zones}},
	journal = {Marine Ecology},
	volume = {31},
	number = {1},
	year = {2010},
	pages = {94{\textendash}110},
	publisher = {Blackwell Publishing Ltd},
	abstract = {The upper continental slope in the northeastern Pacific Ocean is intercepted by a deep oxygen minimum zone (OMZ; 650{\textendash}1100 m) and punctuated by conduits of methane seepage. We examined the effects of these two dominant sources of heterogeneity on the density, composition and diversity of heterotrophic macrofauna off Hydrate Ridge, Oregon (OR; 800 m water depth), where the seeps co-occur within an OMZ, and off the Eel River, Northern California (CA; 500 m), where seeps are overlain by better oxygenated waters. We hypothesized that seeps (containing clam beds and microbial mats) should contribute a suite of distinct species to the regional margin species pool but that OMZ-associated hypoxia would dampen seep-related heterogeneity. Macrofaunal densities were highest (23,000{\textendash}33,510 ind{\textperiodcentered}m-2) in the CA seep sediments and in the OR near-seep samples, intermediate in the OR seep, CA near seep and CA and OR 500-m margin sediments (10,054{\textendash}19,777 ind{\textperiodcentered}m-2), and lowest in the CA and OR OMZ habitats at 800 m (4269{\textendash}7847 ind{\textperiodcentered}m-2). Annelids constituted over 50{\%} of the taxa in all but the CA clam bed and OR microbial mat sediments, where mollusks were abundant. Approximately 50{\%} of seep species appeared to be habitat endemic; species present in microbial mats largely formed a subset of those present in the clam beds. Dorvilleid and ampharetid polychaetes were dominant in the seep sediments; non-seep margin sediments at 500 and 800 m were populated heavily by branchiate polychaetes including cossurids and paraonids. Alpha diversity (Es[20] calculated per core) was lowest and rank 1 dominance was highest in the CA and OR microbial mat habitats. Pooled analyses of Es[100] revealed highest species richness in the CA clam bed and near-seep habitats (30.3 and 29.6, respectively), and lowest species richness in the OR microbial mat and near-seep habitats (16.5 and 17.9, respectively). Non-seep sediments (500 and 800 m) off both CA and OR were more homogeneous (55{\textendash}57{\%} within-habitat similarity) than clam bed and microbial mat sediments (only 32{\textendash}37{\%} within-habitat similarity). CA sediment macrofauna generally exhibit higher alpha diversity, and as habitats are combined, a higher rate of increase in the slope of the species accumulation curves than do OR margin macrofauna. Methane seeps in the NE Pacific introduce significant heterogeneity that increases margin biodiversity at multiple spatial scales. However, our hypothesis that the OMZ would lessen the seep contributions to diversity was not supported. The better oxygenated CA seeps at 500 m shared more of the background margin fauna (at 500 m) than did the OR seeps at 800 m (with OMZ fauna at 800 m). Geographical differences in the fluxes of methane-rich fluids and the increased reliance on chemosynthetic food sources with increased depth could explain these results.},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {1439-0485},
	doi = {10.1111/j.1439-0485.2009.00335.x},
	url = {http://dx.doi.org/10.1111/j.1439-0485.2009.00335.x},
	author = {Levin, L A and Mendoza, G F and Gonzalez, J P and Thurber, A R and Cordes, E E}
}
@article {Rathburn2009,
	title = {{Geological and biological heterogeneity of the Aleutian Margin (1965{\textendash}4822 m)}},
	journal = {Progress In Oceanography},
	volume = {80},
	number = {1-2},
	year = {2009},
	pages = {22{\textendash}50},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0079-6611},
	doi = {10.1016/j.pocean.2008.12.002},
	url = {http://dx.doi.org/10.1016/j.pocean.2008.12.002},
	author = {Rathburn, A E and Levin, L A and Tryon, M D and Gieskes, J M and Martin, J B and Perez, M E and Fodrie, F J and Neira, C and Fryer, G L and Mendoza, G F and McMillan, P A and Kluesner, J and Adamic, J and Ziebis, W}
}
@article {Levin2006,
	title = {{Recruitment response of methane-seep macrofauna to sulfide-rich sediments: An in situ experiment}},
	journal = {Journal of Experimental Marine Biology and Ecology},
	volume = {330},
	number = {1},
	year = {2006},
	pages = {132{\textendash}150},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0022-0981},
	doi = {10.1016/j.jembe.2005.12.022},
	url = {http://dx.doi.org/10.1016/j.jembe.2005.12.022},
	author = {Levin, L A and Ziebis, W and Mendoza, G F and Growney-Cannon, V and Walther, S}
}
@article {Levin2003,
	title = {{Spatial heterogeneity of macrofauna at northern California methane seeps: Influence of sulfide concentration and fluid flow}},
	journal = {Marine Ecology Progress Series},
	volume = {265},
	year = {2003},
	pages = {123{\textendash}139},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0171-8630},
	doi = {10.3354/meps265123},
	url = {http://dx.doi.org/10.3354/meps265123},
	author = {Levin, L A and Ziebis, W and Mendoza, G F and Growney, V A and Tryon, M D and Brown, K M and Mahn, C and Gieskes, J M and Rathburn, A E}
}
