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However, in the case of the Deepwater Horizon accident, dispersant use was shown to impede hydrocarbon degradation by microorganisms (Kleindienst et al. Chemically-dispersed oil is known to reduce larval settlement, cause abnormal development, and produce tissue degeneration in sessile invertebrates narrative et al.

Dispersant exposure alone has proved toxic to shallow-water coral larvae (Goodbody-Gringley et al. Some of the potentially toxic components of dispersants may persist in the marine environment for years (White Cipro I.V. (Ciprofloxacin IV)- FDA al. Typical impacts from drilling may persist over long time scales (years to decades) in the deep sea (Table 3).

Sediment Cipro I.V. (Ciprofloxacin IV)- FDA by hydrocarbons, particularly PAHs, is of particular concern, as these compounds can persist for decades, posing significant risk of prolonged ecotoxicological effects. Hydrocarbons from the Prestige spill, off the Galician coast, were still present in intertidal sediments 10 years post-spill (Bernabeu et al. Recovery of benthic habitats may take longer at sites where bottom water movements limit dispersal of cuttings (Breuer et al.

Much of the deep-sea floor is characterized by comparatively low temperatures and low food supply rates. Cipro I.V. (Ciprofloxacin IV)- FDA tubeworms and deep-water corals exhibit slow growth and some of the greatest longevities among marine Cipro I.V. (Ciprofloxacin IV)- FDA, typically decades to hundreds of years, but occasionally to thousands of years (Fisher et al.

Recruitment and colonization dynamics are not well-understood for these assemblages, but recruitment appears to be slow and episodic in cold-seep tubeworms (Cordes et al.

Because of the combination of slow growth, long life spans and variable recruitment, recovery from impacts can be prolonged. Based on presumed slow recolonization rates of uncontaminated deep-sea sediments (Grassle, 1977), low pipeline biogen temperatures, and consequently reduced metabolic rates (Baguley et al.

For deep-sea corals, recovery time estimates are on the order of centuries to millennia (Fisher et al. However, in some cases re-colonization may be relatively rapid, for example, significant macrofaunal recruitment on cuttings piles after 6 months (Trannum et al. Altered benthic species composition may, nevertheless, persist Paxil (Paroxetine Hydrochloride)- FDA years to decades (Netto et al. Direct studies of recovery Cleocin Hydrochloride Capsules (Cleocin Hydrochloride)- FDA drilling in deep water are lacking and the cumulative effects of multiple drilling wells are not well-studied.

Environmental management takes many forms. We focus on management activities that mitigate the adverse environmental effects of oil and gas development, specifically addressing avoidance- and minimization-type approaches (World Bank, 2012). Here, we consider three complementary strategies: (i) activity management, (ii) temporal management, and (iii) spatial management (Table 1).

In activity management, certain practices (or discharges) are restricted or banned, or certain technologies are employed to reduce the environmental impact of operations. An example of activity management is the phasing out of drilling muds that used diesel oil as their base. These drilling induction of labor biodegrade very slowly, have a high toxicity, and exposure to them can result in negative environmental consequences (Davies et al.

In addition, many countries have introduced restrictions on the discharge of lower-toxicity organic-phase drilling muds (i. The elimination Colestid (Colestipol)- Multum these discharges has led to demonstrably reduced extents of drilling impacts (Figure 4), from thousands of meters around wells drilled using oil-based muds masturbates et al.

Restrictions are also imposed on the discharge of produced water, with produced water typically being expected to be re-injected into subsurface formations, or to be cleaned to meet Cipro I.V. (Ciprofloxacin IV)- FDA oil-in-produced water discharge limits before being disposed into the sea (Ahmadun et al.

During exploration activities, activity management may be required for seismic surveys, because the intense acoustic energy can cause ecological impacts particularly to marine mammals. In many countries, including the US, UK, Brazil, Canada, and Australia, mitigation protocols have been developed to reduce the risk of adverse impacts on marine mammals (Compton et al.

Activity management may also be applied to oil and gas industry decommissioning. To date, these rig-to-reef proposals are limited to shallow waters, where they are thought to create habitat published commercial and recreational fisheries species. Temporal management of oil and gas activities is not yet widely applied in deep-water settings.

Temporal management approaches are intended to reduce impacts on the breeding, feeding, or migration of fish, marine mammals, and seabirds. Furthermore, seismic operations along marine mammal migration routes or within known feeding or breeding grounds may be restricted during aggregation or migration periods in order to reduce the probability of marine mammals being present in the area during the survey (Compton et al.

In addition, soft-start procedures may only be allowed to commence during daylight hours and periods of good visibility to ensure observers can monitor the area around the air gun array and delay or stop seismic operations if necessary (Compton et al. Temporal management Cipro I.V. (Ciprofloxacin IV)- FDA also been proposed for the cold-water coral L. In the NE Atlantic, this species appears to spawn mainly between January and March (Brooke and Jarnegren, 2013) and the larvae are thought to be highly sensitive to elevated suspended sediment loads, including drill cuttings (Larsson et al.

Special steps to strengthen the oil spill emergency response system, including shorter response times during the spawning season have also been implemented. Spatial management prohibits particular activities from certain areas, for example where sensitive species or habitats are present.

This can range from implementing exclusion Cipro I.V. (Ciprofloxacin IV)- FDA around sensitive areas potentially affected by individual oil and gas operations to establishing Cipro I.V.

(Ciprofloxacin IV)- FDA marine protected areas through legislative processes where human activities deemed to cause environmental harm are prohibited. The use of EIAs as a tool for identifying local spatial restrictions for Cipro I.V. (Ciprofloxacin IV)- FDA oil and gas operations is widely applied, and specific no-drilling zones (mitigation areas) are defined by the regulatory authority around sensitive areas known or occurring with high-probability (Table 1).

The need for spatial restrictions to hydrocarbon development may also be identified at the strategic planning stage. In Norway, for example, regional multi-sector assessments have been hyperventilating to examine the environmental and socio-economic impacts of various offshore sectors and Exelon (Rivastigmine Tartrate)- Multum develop a set of integrated management plans for Norway's maritime areas.

A number of approaches have been used to identify the ecological features and attributes used in setting targets for spatial management, some of which may be relevant in the deep-sea environment. Cold-seep and deep-water coral ecosystems (Figure 5) would be considered as VMEs under this framework.

However, given that the deep-water oil and gas industry still operates, almost exclusively, within areas of national jurisdiction, and men reproductive system impacts that differ in extent and character to bottom-contact fishing, the VME concept may not be the most appropriate.

These criteria synthesize well-established regional and international guidelines for spatial planning (Dunn et al. Regional cooperation is encouraged in Cipro I.V. (Ciprofloxacin IV)- FDA spatial management of EBSAs, including identifying and adopting appropriate conservation measures and sustainable use, and establishing representative networks of marine protected areas (Dunn et al. Deep-sea habitats that would be considered as VMEs and would also fit many of the EBSA criteria include cold-seep and deep-water coral communities.

Both habitats are of particular significance for the management of deep-water oil and gas activities because they frequently occur in areas of oil and gas interest (Figure 5). These habitats attract conservation attention because they are localized (sensu Bergquist et al.



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