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2009 PLOO Macrobenthic Chapter.Indd Chapter 5. Macrobenthic Communities INTRODUCTION predation). For example, benthic assemblages on the coastal shelf of southern California typically Benthic macroinvertebrates along the coastal shelf vary along sediment particle size and/or depth of southern California represent a diverse faunal gradients (Bergen et al. 2001). Therefore, in order to community that is important to the marine ecosystem determine whether changes in community structure (Fauchald and Jones 1979, Thompson et al. 1993a, are related to human impacts, it is necessary to Bergen et al. 2001). These animals serve vital have an understanding of background or reference ecological functions in wide ranging capacities conditions for an area. Such information is available (Snelgrove et al. 1997). For example, some species for the monitoring area surrounding the Point Loma decompose organic material as a crucial step in Ocean Outfall (PLOO) and the San Diego region nutrient cycling; other species fi lter suspended in general (e.g., see City of San Diego 1999, 2010; particles from the water column, thus affecting Ranasinghe et al. 2003, 2007). water clarity. Many species of benthic macrofauna also are essential prey for fi sh and other organisms. This chapter presents analyses and interpretations of the macrofaunal data collected at fi xed stations Human activities that impact the benthos can surrounding the PLOO during 2009. Descriptions sometimes result in toxic contamination, oxygen and comparisons of the different macrofaunal depletion, nutrient loading, or other forms of assemblages that inhabit soft bottom habitats in the environmental degradation. Certain macrofaunal region and analysis of benthic community structure species are sensitive to such changes and rarely occur are included. in impacted areas, while others are opportunistic and can persist under altered conditions (Gray 1979). Because various species respond differently to MATERIALS AND METHODS environmental stress, monitoring macrobenthic assemblages can help to identify anthropogenic Collection and Processing of Samples impact (Pearson and Rosenberg 1978, Bilyard 1987, Warwick 1993, Smith et al. 2001). Also, Benthic samples were collected at 22 benthic since many animals in these assemblages are stations in the PLOO region located along the 88, relatively stationary and long-lived, they can 98, or 116-m depth contours (Figure 5.1). These sites integrate the effects of local environmental included 17 “E” stations located from approximately stressors (e.g., pollution or disturbance) over 5 km south to 8 km north of the outfall, and fi ve “B” time (Hartley 1982, Bilyard 1987). Consequently, stations located about 11 km or further north of the the assessment of benthic community structure is outfall. During 2009, the January survey was limited a major component of many marine monitoring to 12 “primary core” stations along the 98-m depth programs, which are often designed to document contour to accommodate additional sampling for the both existing conditions and trends over time. Bight’08 regional project (see Chapter 1), while the July survey included all 22 stations. Four stations Overall, the structure of benthic communities may considered to represent “nearfi eld” conditions herein be infl uenced by many factors including depth, (i.e., E11, E14, E15, E17) are located between about sediment composition and quality (e.g., grain 100 and 750 m of the outfall wye or diffuser legs. size distribution, contaminant concentrations), oceanographic conditions (e.g., temperature, salinity, Two replicate samples for benthic community dissolved oxygen, ocean currents), and biological analyses were collected per station during each factors (e.g., food availability, competition, survey using a double 0.1-m2 Van Veen grab. One 47 2009 PLOO Macrobenthic Chapter.indd 47 6/29/2010 4:01:34 PM richness (number of species), abundance (number La J o ll a of individuals), Shannon diversity index (H'), Pielou’s evenness index (J'), Swartz dominance (see B11 Swartz et al. 1986, Ferraro et al. 1994), benthic response B12 ! index (BRI; see Smith et al. 2001), and infaunal B8 o River B10 B9 San Dieg ! trophic index (ITI; see Word 1980). Additionally, the Sa n D i e g o total or cumulative number of species over all grabs E26 ! ma was calculated for each station. t Lo o B a y i eg D E25 oin n a ! P S Multivariate analyses were performed using PRIMER Co r o n ad o E23 ! E20 E19 software to examine spatio-temporal patterns in the E21 ! E17 ! overall similarity of benthic assemblages in the utfall E15 E14 ma O ! Point Lo E11 10 m region (Clarke 1993, Warwick 1993, Clarke and ! E8 E7 E9 ! Gorley 2006). These analyses included classification E5 ! (cluster analysis) by hierarchical agglomerative E2 E1 E3 ! clustering with group-average linking and ! Primary core stations LA5 / Secondary core stations ordination by non-metric multidimensional scaling (MDS). Macrofaunal abundance data were square- 150 m LA4 4 root transformed and the Bray-Curtis measure of km 100 80 m 20 m 150 m 60 m 0 1 2 3 4 5 m similarity was used as the basis for classification. Figure 5.1 Similarity profi le analysis (SIMPROF) was used to Benthic station locations sampled for the Point Loma confi rm non-random structure of the dendrogram Ocean Outfall Monitoring Program. (Clarke et al. 2008), while the ‘similarity percentages’ routine (SIMPER) was used to identify species that of the two grabs from the fi rst cast was used for typifi ed each cluster group. macrofauna, while the adjacent grab was used for sediment quality analysis (see Chapter 4); a second A BACIP (Before-After-Control-Impact-Paired) grab for macrofauna was then collected from a statistical model was used to test the null subsequent cast. Criteria established by the EPA to hypothesis that there have been no changes in select ensure consistency of grab samples were followed community parameters due to operation of the with regard to sample disturbance and depth of PLOO (see Bernstein and Zalinski 1983, Stewart- penetration (U.S. EPA 1987). All samples were Oaten et al. 1986, 1992; Osenberg et al. 1994). sieved aboard ship through a 1.0-mm mesh screen. The BACIP model compares differences between Organisms retained on the screen were collected control (reference) and impact sites at times and relaxed for 30 minutes in a magnesium sulfate before (i.e., July 1991–October 1993) and after solution and then fi xed in buffered formalin. After (i.e., January 1994–July 2009) an impact event a minimum of 72 hours, each sample was rinsed (i.e., the onset of discharge). The analyses with fresh water and transferred to 70% ethanol. presented in this report are based on 2.5 years All animals were sorted from the debris into major (10 quarterly surveys) of before impact data and taxonomic groups by a subcontractor, and then 16 years (51 quarterly or semi-annual surveys) of identifi ed to species (or the lowest taxon possible) and after impact data. The E stations, located between enumerated by City of San Diego marine biologists. about 0.1 and 8 km of the outfall, are considered most likely to be affected by wastewater discharge Data Analyses (Smith and Riege 1994). Station E14 was selected as the impact site for all analyses; this station is located The following community structure parameters were near the boundary of the Zone of Initial Dilution (ZID) calculated for each station per 0.1-m2 grab: species and probably is the site most susceptible to impact. 48 2009 PLOO Macrobenthic Chapter.indd 48 6/29/2010 4:02:04 PM In contrast, the B stations are located farther per 0.1-m2 sample (Table 5.1). The largest number from the outfall (> 11 km) and are the obvious of animals occurred at station E9, which was the candidates for reference or control sites. However, only station to average more than 500 animals benthic communities differed between the B and E per grab. The fewest animals (mean = 234/grab) stations prior to discharge (Smith and Riege 1994, were collected at station E8, while the remaining City of San Diego 1995). Thus, two stations (E26 and sites had abundances averaging between 254 B9) were selected to represent separate control sites and 412 animals per grab. Overall, there was a in the BACIP tests. Station E26 is located 8 km north 25% increase in macrofaunal abundance collected of the outfall and is considered the E station least at the 12 primary core stations between 2008 and likely to be impacted. Previous analyses suggested 2009, with the largest difference occurring at that station B9 was one of the most appropriate station E14 (e.g., see City of San Diego 2009). This B stations for comparison with the E stations near-ZID site averaged 237 and 412 individuals (Smith and Riege 1994, City of San Diego 1995). Six per grab in 2008 and 2009, respectively. dependent variables were analyzed, including three community parameters (number of species, infaunal Species diversity, evenness, and dominance abundance, BRI) and abundances of three taxa that Diversity index values (H') averaged from 3.2 to 4.2 are considered sensitive to organic enrichment. at the PLOO stations during 2009 (Table 5.1), which These indicator taxa include ophiuroids in the genus was generally similar to that seen in previous years Amphiodia (mostly A. urtica), and amphipods in (e.g., City of San Diego 1995, 2009). The lowest the genera Ampelisca and Rhepoxynius. All BACIP diversity (H' 3.3) continued to occur at stations analyses were interpreted using one-tailed paired E1 and B8, while the remaining stations had mean t-tests with a type I error rate of α = 0.05. H' values ≥ 3.7. There were no apparent patterns relative to distance from the outfall discharge site. Evenness (J') compliments diversity, with RESULTS AND DISCUSSION higher J' values (on a scale of 0–1) indicating that species are more evenly distributed (i.e., not Community Parameters dominated by a few highly abundant species).
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