Download presentation
Presentation is loading. Please wait.
Published byNeal Malone Modified over 9 years ago
1
Danielle Verna Alaska Pacific University Pacific Ballast Water Group - April 16, 2014 Influences of policy and vessel behavior on the risk of ballast-borne marine species invasions in coastal Alaska
2
Vector-based Invasion Risk Ruiz & Carlton 2003 Dose-Response Relationship Wonham et al. 2013 The expected number of species that will establish is the sum of the probability of each species establishing Species Assemblages Holzer 2013
3
Application for Alaska Ruiz et al. 2011 Last analysis of vessel arrival & ballast discharge data in AK was for 2003 – 2004 (McGee et al. 2006) Hotspots of invasive species along the US west coast High potential for coastwise transfer of species (secondary spread)
4
US BWM Policy 2004: USCG Mandatory BWM reporting Mandatory BWM Exemptions: Crude oil tankers involved in coastwise trade Traveling within one Captain of the Port Zone DOD & USCG vessels 2008: EPA - 2008: EPA - Vessel General Permit Regulated Pacific nearshore voyages Mandatory management & record keeping for crude oil tankers involved in coastwise trade
5
Ballast in AK, 2005 - 2012 ~72% of ballast discharge was sourced on the US west coast or British Columbia Tankers discharged ~88% of all ballast Only 33% of reported ballast was managed (BWE) 3,773 discharging arrivals 28,213 ballast tanks 7.5 x10 7 MT of ballast 67 ports/bays 910 offshore lat/long
6
Ecoregions of Alaska Spalding et al. 2007 92% 4% 2% Ballast in AK, 2005 - 2012
7
Ballast Discharge Hotspots Valdez Red Dog Southeast Dutch Harbor Afognak Seward Nikiski Ballast Discharge Volume (MT)
8
Reported ballast discharge in AK, 2005 - 2012
9
Supply & Demand? EPA VGP Reported ballast discharge in AK, 2005 - 2012 Risk Assessment
10
Reporting increase, 2008 - 2009 Anchorage Kodiak 99% of the increase was to the Gulf of Alaska region Coastwise ballast: 1095% increase Overseas ballast: 17% increase Valdez: 1170% increase in reported ballast discharge volume 47 to 258 reporting tankers
11
Valdez Seward Nikiski Afognak Dutch Harbor Red Dog Vessel Type & Exports
12
Red Dog Sources Managed Unmanaged
13
Dutch Harbor Sources Managed Unmanaged
14
Valdez Sources Managed Unmanaged
15
Model risk as a function of environmental similarity, ballast water age, ballast water volume & species richness Between source region and top 15 ports by volume Risk Assessment 2009 - 2012 High-latitude risk assessments: Baltic Sea (Leppäkoski & Gollasch 2006) Canada (Chan et al. 2013) Norway (Ware et al. 2013)
16
Environmental Similarity ‣ (positively correlated with risk) 1) Low non-adjacent ecoregion 2) Medium adjacent ecoregion 3) High same ecoregion A weighted average was applied to the proximity ranking based on the volume of ballast per source ecoregion A weighted average was applied to the proximity ranking based on the volume of ballast per source ecoregion Risk Framework Spalding et al. 2007
17
Ballast water age (negatively correlated with risk) Risk Framework Number of days between source and discharge date
18
Ballast water volume (positively correlated with risk) Serves as a proxy for propagule pressure 0.1 correction factor applied to managed ballast to represent 90% efficacy rate of BWE (Ruiz & Reid 2007) Risk Framework
19
Species Richness (positively correlated with risk) Number of ballast-borne marine invasive species per source ecoregion (Molnar et al. 2008) Number of ballast-borne marine invasive species per source ecoregion (Molnar et al. 2008) Risk Framework
20
Environmental Similarity Age (days) Corrected mean volume of ballast water discharge: ecoregions & ports (log 10 MT) Species Abundance (1) Low < 1> 10< 2.6< 110 (2) Medium 1 – 26 – 102.6 – 5.1110 – 219 (3) High > 2< 6> 5.1> 219 Risk Scale
25
Valdez, Nikiski, Drift River Terminal & Dutch Harbor may be hotspots for invasion Risk to all ports was greatest from environmental similarity and ballast water volume Past policy exemptions hindered monitoring and elevated risk Results & Implications
26
Analysis of impacts from other management exemptions (i.e. Captain of the Port Zones) Finer-scale risk analysis Focused management and survey efforts at source and discharge ports based on relative risk Ballast water treatment systems AK regulations? Further Study
27
Increased Arctic vessel traffic Northwest Passage & Northern Sea Route Bering Strait bottleneck Looking Ahead…
28
Port development Offshore oil & gas growth
29
Acknowledgements
30
PortEnvironmental Similarity Risk 2009201020112012All Afognak21112 Drift River Terminal32333 Dutch Harbor22222 Hawk Inlet11122 Hydaburg11212 Ketchikan33333 Kodiak32212 Klawock11111 Nikiski22222 Prince William Sound12102 Red Dog22222 Seward32222 Skagway12122 Tolstoi Bay00111 Valdez22222 Risk
31
PortVolume Risk 2009201020112012All Afognak22222 Drift River Terminal22333 Dutch Harbor22222 Hawk Inlet22222 Hydaburg22222 Ketchikan22222 Kodiak12122 Klawock11122 Nikiski33323 Prince William Sound32203 Red Dog22223 Seward22223 Skagway12122 Tolstoi Bay00122 Valdez33333 Risk
32
PortAge Risk 2009201020112012All Afognak11111 Drift River Terminal22333 Dutch Harbor11111 Hawk Inlet11111 Hydaburg11111 Ketchikan11111 Kodiak31111 Klawock11111 Nikiski12211 Prince William Sound22202 Red Dog11111 Seward11111 Skagway11111 Tolstoi Bay00111 Valdez22222 Risk
33
PortSpecies Richness Risk 2009201020112012All Afognak11111 Drift River Terminal12222 Dutch Harbor22223 Hawk Inlet12112 Hydaburg11111 Ketchikan11111 Kodiak11111 Klawock11111 Nikiski11122 Prince William Sound11102 Red Dog11111 Seward11111 Skagway11111 Tolstoi Bay00111 Valdez22222 Risk
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.