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Distributions of Natural Heritage Program Communities and their Use as Surrogates for Rare Species in New York State Parks
George R. Robinson

Northeastern Naturalist, Volume 19, Special Issue 6 (2012): 115–128

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Northeast Natural History Conference 2011: Selected Papers 2012 Northeastern Naturalist 19(Special Issue 6):115–128 Distributions of Natural Heritage Program Communities and their Use as Surrogates for Rare Species in New York State Parks George R. Robinson* Abstract - Biodiversity distributions can be quantified as alpha (taxonomic richness), and beta (compositional heterogeneity) components. In both cases, accurate and detailed assessments require substantial resources, so surrogate measures have been proposed and tested. Scientists from the New York Natural Heritage Program (NHP), working in over 140 New York State Parks, recorded occurrences of 128 different ecological communities, 98 significant (rare or exemplary) ecological communities, and 312 rare species. I used their data to test whether community distributions were valid surrogates for rare species diversity at alpha and beta levels. I found that (1) alpha patterns among the State Parks were similar for NHP significant communities and rare species; (2) beta patterns were contrasting, such that NHP significant communities were weak surrogates at this level; (3) alpha distributions were poor predictors of Beta distributions among parks; and (4) a large fraction of beta diversity is attributable to variation in geographic region, but most State Parks and all State Park Regions make unique contributions. Introduction Measuring and interpreting patterns of biodiversity distributions remain core research topics in ecology, with the added element of urgency in their application to conservation planning and management. The dominant metric in conservation remains species-level alpha diversity, counts of taxa (± relative abundances) within defined areas—information that demands time and resources, but omits key information such as species composition (Sarkar et al. 2006). The primary elements of interest to conservation are rare species and their subspecific taxa, which by definition are infrequent, cryptic, or otherwise difficult to document across their natural ranges, so determining their status may require indirect means. The common approach to this dilemma is the use of surrogate data, including “coarse filter” assessment (Noss 1987, Noss and Cooperrider 1994). There appear to be three main categories of surrogates in biological conservation. The first is species richness, as applied in species-area relations (SAR). The information is coarse because, in the absence of data on abundance and composition, it gives no insight into the status of particular species. SAR has been used to model “effective” sizes of parks and preserves in fragmented landscapes (reviewed in Harrison and Bruna 1999, Robinson and Quinn 1992), to identify critical gaps in conservation coverage (Davis et al. 1990, Scott et al. 1987), and to predict changes in species diversity with loss of habitat area in rapidly changing *Department of Biological Sciences, State University of New York, Albany, NY 12222; grobins@albany.edu. 116 Northeastern Naturalist Vol. 19, Special Issue 6 landscapes (Brooks et al. 1999, Pimm et al. 1995; but see He and Hubbell 2011 for a critique on methodologies). The second category involves the use of particular species as surrogates, such as “umbrella” and “indicator” species. In these applications, detailed knowledge of the status of one or a few species guides the stewardship of many others, and protecting a well-studied focal species is assumed to contribute to the preservation of other, more obscure organisms. For example, safeguarding populations of large, wide-roaming carnivores may secure habitat for a fuller spectrum of native biota (Thorne et al. 2006), or the status of a habitat specialist may serve as an indication of the condition of a rare ecosystem (Launer and Murphy 1994). These kinds of extrapolations are not without flaws (Andelman and Fagan 2000), particularly when more common taxa are used as surrogates for legally protected species and subspecies (Murphy et al. 2011). However, surrogate species have been validated at relatively large spatial scales (Andersen and Majer 2004, Pearman et al. 2006) and in cross-taxa analyses (Oliver et al. 1998, Su et al. 2004). The third category is the use of species assemblages and communities as surrogates for other elements of biodiversity, such as habitat diversity and rare taxa (Noon et al. 2003, Reyers et al. 2001, Williams et al. 2006). Ecological communities are temporally and spatially variable, and can be characterized to include or exclude certain kinds of species and geological features (Morin 1999, Mueller-Dombois and Ellenberg 1974, Whittaker 1975). As such, they lack the firmer definitions accorded to species, particularly with respect to their durability (Hunter et al. 1988). However, community classification systems have descriptive value at regional (sub-biome) scales (e.g., Barbour and Billings 1988). For stewardship purposes, ecological communities, once classified, can be mapped and monitored (Grossman et al. 1999, Jennings 2000). In addition, when standards and protocols are maintained, they can be treated as candidates for protection in their own right (Noss 1987). The New York Natural Heritage Program (NHP) has its own community classification system (Edinger et al. 2002, Reschke 1990), based on the NatureServe (2002) methods, in which communities are delineated in over 200 categories. Within this system, natural communities are distinguished from anthropogenic (“cultural”) communities, and rare natural communities receive an additional designation as “significant” communities. In this paper, I draw on NHP records for New York State Parks to examine how distributions of communities can serve as surrogates for other measures of biodiversity distributions. Sarkar et al. (2006) distinguish between “true” surrogates and “estimator” surrogates for conservation planning. An example of the former would be highly accurate and detailed information on a rare species’ distribution, abundance, and viability. Although directly relevant to conservation, this is considered surrogate information, because it portrays only a fraction of the full breadth of biodiversity that could be measured. Estimator surrogates are more commonly employed, for practical reasons, including the urgency inherent in most conservation planning. Examples include counts of different species assemblages, such as ecological communities, and extend to higher levels of ecological organization. An estimator surrogate is most useful for conservation planning when it can be tested 2012 G.R. Robinson 117 directly against other measurements of biodiversity (Sarkar et al. 2006, Tognelli 2005, Williams et al. 2006). The two main questions addressed here are: (1) How are NHP communities and rare species distributed within the New York State Park system? (2) Do NHP communities serve as valid surrogates for rare species? To answer the first question, I compared frequencies of NHP ecological communities among State Parks (on the basis of park size), among 11 State Park regions, and between the State Park system and the fuller statewide database. To answer the second, I used regression models and accumulation curves to test whether frequencies of NHP significant communities predicted frequencies of rare species within and among State Parks. For both questions, comparisons were made on the basis of alpha distributions (simple counts of community types and species) and beta distributions (how evenly each community type or species is distributed) among individual State Parks and State Park Regions. Methods Data sources The New York State Office of Parks, Recreation, and Historic Preservation (OPRHP) operates 176 State Parks, well distributed across the state (maps at: NYS OPRHP 2011a), and organized into 12 State Park regions. During 1999– 2004, the NY Natural Heritage Program (NHP) surveyed the majority of State Parks under a State Lands Assessment contract, supported by the NY State Biodiversity Research Institute (NY NHP 2005a). NHP has continued to maintain and update the information, including additions of new records through field surveys. Although the effort did not include full species inventories, the underlying work was systematic, standardized, and reviewed. The dataset is useful and interesting because multiple taxonomic groups were studied, most State Parks were included, and the parks are geographically well dispersed. The NHP survey began with over 140 parks, documenting the presence and locations of rare species and ecological communities, the latter classified according to the NHP system (Reschke 1990, Edinger et al. 2002). Records of one or more NHP ecological communities are available for 134 New York State Parks. A total of 8605 NHP ecological community records were produced (many with multiple occurrences inside a given park), representing 128 different NHP community types (over 2/3 of the 176 natural communities in Edinger et al. [2002]). I collapsed multiple occurrences of the same NHP community type to one record per park, reducing the count to 1156 records in the 134 parks, a mean of 8.30 different natural communities per park. There were an additional 291 records for NHP significant communities, whose designation is based on determinations of rarity in NY State, or their status as outstanding examples of the more common natural communities (NY NHP 2005b). These records are stored separately as NHP Element Occurrences, and mapped and recorded in the same statewide database as rare species. As with NHP ecological communities, multiple occurrences of NHP significant communities were reduced to one record of each per park, yielding 230 records, located in 80 State Parks, with a mean of 2.88 NHP significant communities per park. In 29 cases, a single significant community was 118 Northeastern Naturalist Vol. 19, Special Issue 6 mapped to include more than one State Park, and in each case, it was assigned to that park that had been determined as its primary location. My rationale here was the understanding that NHP staff conduct most ground-level community surveys at primary locations, and maps are later extrapolated from imagery (J. Lundgren, NYNHP, Albany, NY, pers. comm.) Rare species were recorded in 102 State Parks in several categories, three of which were used here: vascular plants, vertebrates, and invertebrates. The mean count was 5.55 total rare species per park. Two other NHP categories—unique animal assemblages and nonvascular plants—were excluded because they were limited to a few parks and based on less systematic inventories. The two datasets used for this paper (State Park NHP community maps and statewide NHP Element Occurrences) contained records validated as of December 2009. Analytical procedure NHP ecological and significant communities were treated as taxonomic entities, and analyzed for alpha diversity (counts per State Park), for comparison with counts of rare species. Only parks with non-zero counts were used in each case, for two reasons: first, zero values steepen regression curves and inflate degrees of freedom; second, although the data represent substantial effort by NHP scientists, surveys were not exhaustive, so absence of records is not conclusive evidence for true zero values. Although less frequent than the full set of NHP ecological communities, NHP significant communities proved to be better predictors of rare species counts, and were used in comparisons of beta diversity (heterogeneity of distributions) among State Parks. For beta tests, parks were also grouped in State Park regions, because beta distributions are scale-dependent (e.g., MacNally et al. 2004, Stevens and Willig 2002, Veech and Crist 2007), so grouping parks by region can reveal geographic properties of their beta distributions. Alpha distributions. Frequency distributions were compared for all NHP ecological communities, NHP significant communities, and rare species for State Parks that had records for each, and tested numerically with the second-order Hill Index (reciprocal Simpson Index; Magurran 2004): 1 / Σpi 2, where pi is the relative frequency of each community type or species. Counts of communities and species per park were regressed on park size (both variables log-transformed), as in a species-area analysis (MacArthur and Wilson 1967), to test for area-related distribution patterns. To test for surrogacy, rare species were separated into vascular plants, vertebrates, and invertebrates, and their individual and pooled numbers per park were regressed on counts of NHP ecological and NHP significant communities per park. Data were organized and manipulated using SQL-based software (MS Access™ 2007, MS Visual FoxPro™ 9.0), and statistical analyses were performed using SYSTAT™ 11. Logarithmic transforms were made using the formula ln(x + 1). Beta distributions. Beta diversity has a variety of ecological definitions (reviewed in Anderson et al. 2010, Jost 2007, Koleff, et al. 2003, Tuomisto 2010), but the common objective is quantifying compositional heterogeneity. In the case of New York State Parks, high beta of NHP significant communities or rare species 2012 G.R. Robinson 119 would indicate heterogeneity in their distributions, sometimes referred to as high “complementarity” (Lund and Rahbek 2002, Williams et al. 2006). Beginning with the original concept (Whittaker 1972), graphical methods have been particularly useful for describing beta distributions. I prepared accumulation curves, similar to those employed in conservation planning (Sarkar et al. 2006) and in more general assessments of species diversity in parks and preserves (Quinn and Harrison 1988, Robinson and Quinn 1992). Unlike rarefaction curves, which tabulate the cumulative number of taxa versus the number of individuals encountered (Magurran 2004), the cumulative number of community types or species is re-tabulated as each State Park is added. Steeper accumulation rates indicate greater heterogeneity, i.e., greater individual contributions per park. For this analysis, it was necessary to set a starting point and a pattern for accumulating parks and NHP records. The State Parks included range in size from 4 ha to >27,000 ha, and contain from 1 to 13 NHP significant community types and 1 to 28 rare species each. Therefore, rather than random ordering, I found it more informative to rank them in order of alpha diversity, from highest to lowest counts of NHP significant communities, incrementing cumulative counts as parks are added. This approach allows direct comparisons between alpha and beta distributions, and between NHP significant communities and rare species. In addition, accumulation rates were tabulated as quartiles of NHP significant communities and species, noting the number of parks required to reach each quartile. All parks with at least one significant community and/or one rare species were included (n = 139). The same analyses were repeated for State Parks pooled into eleven OPRHP regions. A twelfth region, which is limited to historic sites within the Adirondack and Catskill Parks, was excluded. Results Alpha distributions NHP ecological communities appear more evenly distributed (Fig. 1a) than NHP significant communities or rare species (Fig. 1b, c), and this finding is supported by inverse Simpson values (1/D = 38.84, 43.91, and 42.41, for NHP ecological communities, NHP significant communities, and rare species, respectively). For all three categories, alpha diversity increased with park size (Fig. 2a–c), with regression slopes in the same ranges as species-area curves reported for continental shelf islands and other park systems (MacArthur and Wilson 1967, Quinn and Harrison 1988). There was an approximate 1:1 relationship between NHP significant communities and rare plants per park, with declining ratios for vertebrates and invertebrates (Table 1). Counts of NHP significant communities were correlated with counts of NHP ecological communities (R2 = 0.382, P < .01), but NHP significant communities were two-to-four times more likely to predict the occurrence of rare species in all categories, with higher correlation coefficients (Table 1). Beta distributions Beta diversity of NHP significant communities was relatively high among the State Parks studied, with many lower-ranked parks (those with fewer significant community types) contributing to the cumulative total (Table 2, Fig. 3a). The 120 Northeastern Naturalist Vol. 19, Special Issue 6 accumulation curve for rare species was considerably steeper, indicating that the majority of rare species are not members of the NHP significant communities recorded. In both categories, most parks need to be included for a full representation (77/80 of those with NHP significant communities, and 128/132 for those with rare species; Table 3). At the regional level, beta distributions were more Figure 1. Frequency distributions for (a) New York Natural Heritage Program (NHP) ecological communities, (b) NHP significant communities (naturally rare or outstanding examples of more common communities), and (c) rare species in New York State Parks. Data limited to parks with at least one record in each case (a: n = 134; b: n = 80; c: n = 102). 2012 G.R. Robinson 121 consolidated, with two State Park Regions (in rank order, the Long Island Region and the Palisades Region) contributing half the cumulative count for NHP significant communities and two-thirds for rare species (Fig. 3b). However, even the least diverse region (New York City), with only two parks totaling 105 ha, Figure 2. Diversity-area relationships in New York State Parks, for (a) 128 NHP ecological communities in 134 parks, (b) 98 NHP significant communities in 80 parks, and (c) 312 rare species in 102 parks. Regression slopes (95% CI): (a) 0.284 (0.168), R2 = 0.395, P < .001; (b) 0.258 (0.071), R2 = 0.253, P < .001; (c) 0.271 (0.083), R2 = 0..297, P < .001. 122 Northeastern Naturalist Vol. 19, Special Issue 6 Table 1. Least-squares regression results for tests of counts of rare species versus counts of NHP ecological communities and NHP significant communities per park in New York State Parks containing one or more of each community type. In all cases, F-tests against a slope of zero are significant (P < 0.001). Category Coefficient 95% CI R2 a. NHP ecological communities (n = 134 parks) Vascular plants 0.36 0.11 0.24 Vertebrates 0.19 0.06 0.20 Invertebrates 0.11 0.04 0.24 Pooled rare species 0.69 0.17 0.33 b. NHP significant communities (n = 80 parks) Vascular plants 1.28 0.32 0.46 Vertebrates 0.68 0.19 0.40 Invertebrates 0.26 0.12 0.19 Pooled rare species 2.35 0.47 0.57 Table 2. Minimum number of New York State Parks required to accumulate each quartile of total NHP significant community types and rare species in Fig. 3a. Cumulative Parks Beta Category Quartile number required NHP significant communities 1 25 3 2 49 9 3 73 23 4 98 77 Rare species 1 78 5 2 155 14 3 233 51 4 312 128 Table 3. Minimum number of New York State Park Regions required to accumulate each quartile of total NHP significant communities among New York State Park Regions in Fig. 3b. Cumulative Regions Beta Category Quartile number required NHP significant communities 1 25 1 2 49 2 3 73 4 4 98 11 Rare species 1 78 1 2 155 2 3 233 5 4 312 11 contributed. As a result, the full complement of NHP significant communities and rare species can be acquired only through inclusion of all regions. 2012 G.R. Robinson 123 Discussion Alpha and beta distributions are requisite information for effective conservation planning and management (Davis et al. 1990, Ferrier et al. 2000, Kessler et al. 2009, Margules and Pressey 2000, Sarkar 2006), yet assessing either requires investments of precious time and scarce talent. As a partial solution to deficits in alpha-level information, surrogate measures have been proposed and tested, with some notable successes (e.g., Andersen and Majer 2004, Launer and Murphy 1994, Lund and Rahbek 2002, Oliver et al. 1998, Su et al. 2004, Thorne et al. 2006, Tognelli 2005). Tests for surrogacy at the Beta level appear to be less frequent, but include correlations among taxonomic groups (Clough et al. 2007, Pharo et al. 1999, Sætersdala et al. 2003), congruence among related taxa (Terlizzi et al. 2009), and at least one comparison between assemblages and species (Ward et al. 1999). The latter study found that the most effective way to accumulate species in a marine reserve system was to accumulate a diversity of habitats, rather than species assemblages. In this paper, I used a well-defined set of assemblages that also captures a range of habitat diversity, NHP community classifications (Edinger et al. 2002, Reschke 1990), to test whether they may serve as surrogates for the subset of species listed as rare in New York State, looking at both alpha and beta distributions. My main findings were that (1) alpha distribution patterns among New York State Parks were similar for NHP significant communities and rare species, and parks with more NHP significant communities had more rare species in three taxonomic categories and as a pooled set; (2) beta distributions were divergent among parks and among State Park Regions, with species accumulating more slowly than Figure 3. Accumulation curves for 98 NHP significant communities and 312 rare species in 139 individual New York State Parks containing at least one rare species or NHP signifi cant community. (a) Parks ranked in order of number of NHP significant community types per park (rank 1 = 13, rank 12 = 0); upper curve (closed triangles) = rare species, lower curve (open circles) = NHP significant communities. (b) Parks pooled into 11 New York State Park Regions, ranked in order of number of NHP significant community types (rank 1 = 36, rank 12 = 3); upper curve (closed triangles) = rare species, lower curve (open circles) = NHP significant communities. 124 Northeastern Naturalist Vol. 19, Special Issue 6 NHP significant communities; (3) alpha distributions were poor predictors of beta distributions, and many of the least diverse parks (those with the fewest NHP signifi cant communities) make unique contributions to the rare species pool; and (4) a large fraction of beta diversity is attributable to variation in geographic region, but most parks and all State Park Regions make unique contributions. The first finding offers some support for the use of NHP significant communities as surrogates for rare species. Both have similar frequency distributions and similar relationships to park size, with large parks containing more of each, although with considerable scatter around the regression lines. Part of this residual variation is explained by the second finding, which would indicate that higher communitylevel diversity tracks higher species-level diversity. Abundance of the more common NHP ecological communities was correlated with abundance of NHP signifi cant communities, on a per park basis, but they were not distributed in ways that made them useful surrogates for rare species, even at the alpha level. A simple explanation for the first two findings is that they are redundant— that most of the rare species are embedded in NHP significant communities. The third finding negates that explanation, because rare species accumulate at a much lower rate, and continue to accumulate in parks with no records of NHP signifi- cant communities. Added to this, the fourth finding tends to rule out the validity of NHP significant communities as conservation “estimator” surrogates (Sarkar et al. 2006) for rare species. Although State Parks and State Park Regions with the highest alpha diversity contribute disproportionately, most parks and all regions are needed to build the full species pool, i.e., to maximize gamma diversity (Whittaker 1975) within the agency’s holdings. The last finding demonstrates that much of the beta diversity among parks is attributable to their wide geographic distribution. Despite their relative small total surface area (less than 1% of the state is occupied by all 176 State Parks combined) and small average individual area (median = 130 ha), the parks harbor a wide range of different ecosystems. In addition, they are not randomly dispersed, but tend to occur in unique settings. For example, almost half are located in coastal zones, where they represent some of the last remaining natural coastal habitats, while others were established to preserve unique geological settings or other natural features that support rare or unusual fauna and flora (Robinson, in press). Although my results indicate that NHP significant communities were weak surrogates, they have special conservation value in and of themselves (Noss 1987). Unique plant communities have long been featured in descriptions of parks and preserves (e.g., Muir 1909), and in practice, they are given their own protected status in New York State Park Master Plans (NYS OPRHP 2011b). An added benefit is that ecological communities tend to be less vulnerable to degradation or collection than individual species, so their locations can be shared more freely for management planning and educational purposes (Robinson, in press). An unusual feature of this study is that two categories of rarity were compared. By definition, rare taxa and assemblages should have heterogeneous distributions, but unless they are highly nested (most rare species are members of rare assemblages), there is no a priori reason to assume that they have equivalent beta distributions. They did not in this case, and most State Parks contributed 2012 G.R. Robinson 125 differently to one or the other category. One possible explanation is that the NHP significant communities reflect different environmental prerequisites, for example area-based constraints. Significant communities in some cases are delineated for their relative size, and a look at the NHP database of Element Occurrences in State Parks shows that mean mapped area for NHP significant communities is 478 ha, equivalent to the mean for vertebrates (532 ha), but much greater than that for vascular plants (10 ha) or invertebrates (37 ha), and the bulk of the records (496/768) are occurrences of plants or invertebrates. Although these values tend to be estimates rather than finely delineated ranges, it seems clear that NHP significant communities occupy larger areas than most rare species. Furthermore, as part of their definition, the significant communities are found in relatively pristine conditions, whereas rare species may occur in pockets that are embedded in less pristine circumstances. These and other unmeasured variables may help explain the divergent beta patterns. State parks throughout the United States are heavily visited for recreational use (Siikamȁki 2011), but they also share responsibilities for stewardship of natural resources (Robinson 2012), a responsibility given explicit recognition in New York State (NYS OPRHP 1993, 2011b). The NHP surveys covered in this paper lend special emphasis and clarity to those responsibilities, and demonstrate that the State Parks are valuable reservoirs of biodiversity. Literature on conservation planning includes critical evaluations of conservation “portfolios”, with a goal of maximizing conservation value by shedding parks and preserves that are overly redundant, and replacing them with holdings that raise overall levels of protected biodiversity (e.g., Fuller et al. 2010, Margules and Pressey 2000, Pressey et al. 1994). However, the exceptionally high beta diversity among New York State Parks demonstrates that the agency manages a valuable conservation portfolio with high levels of complementarity among parks, and with crucial contributions from all geographic sectors. Acknowledgments Database access and assistance were provided by the NYS Natural Heritage Program, with thanks to D.J. Evans, Nick Conrad, Tara Salerno, and Julie Lundgren. Field inventories for the State Parks were conducted by many NHP scientists, including D.J. 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