Boston Harbor Research Articles

Historical insights, current challenges: tracking marine biodiversity in an urban harbor ecosystem in the face of climate change

The Boston Harbor Islands is the only coastal drumlin archipelago in the USA, featuring a distinctive and uncommon geological intertidal habitat known as mixed coarse substrate, which supports a range of coastal species and ecological processes. Recently designated as one of America’s 11 most endangered historic places due to climate change impacts, coastal adaptation and restoration efforts are crucial to their preservation. Such efforts can benefit from historic and current knowledge of endemic and emergent biodiversity. To investigate broad trends in coastal biodiversity, we compiled an inventory of marine coastal macroalgae, macroinvertebrates, fish, mammals, and shorebirds observed in the harbor since 1861. Records span 159 years, consisting of 451 unique taxa from 19 phyla. Analysis of average taxonomic distinctness (AvTD) revealed increases in diversity towards the end of the twentieth and early twenty-first century, likely associated with improved water quality (dissolved oxygen; AvTD > 85, p = 0.01) due to harbor restoration in the 1980s. Macroinvertebrates comprised 50% of the records, making this the most diverse taxonomic group in the time series. A significant increase of non-indigenous species, primarily macroinvertebrates and macroalgae, was observed over the last 20 years near human infrastructure and across multiple islands, a consequence of global change and characteristic of most urban harbors. The mixed coarse intertidal habitat, which makes up > 70% of Boston Harbor’s inner islands and supports high macroinvertebrate and macroalgal diversity (47% of species records), is not routinely monitored; our findings serve as a foundational resource for climate adaptation projects and decision-making.

Seasonal and Distributional Changes in the Composition and Flux of Anthropogenic Microparticles in the Surface Waters of the Charles River, Massachusetts, United States

Plastic is a growing global environmental problem. While much of the focus of anthropogenic microparticles has focused on microplastics and their occurrence in marine systems, anthropogenic microparticles are found in freshwater systems. The Charles River is a highly impacted and historically important river within Massachusetts and runs for 80 miles within the state of MA through a variety of land uses. Microparticle concentrations were found to vary along the length of the river and ranged in concentrations from 1–19 pieces/L, with generally higher concentrations downstream. Microfibers were the dominant (72%) type of microparticles found, and the majority (avg 76%) of microparticles were synthetic. The highest estimated flux of microparticles occurred in May, with an estimated flux of 2 billion microparticles per day via the Charles River into the Boston Harbor. The average annual concentration of microparticles was correlated with land use, with higher concentrations occurring in regions with higher impervious coverage and in areas designated as industrial or high-density residential. Polyester, polypropylene, and polyamides were the dominant plastic polymers. However, seasonal changes in the relative importance of each polymer, along with changes in the abundance and flux rates, indicate that there would be seasonal variability in the type of microparticles exported. Changes in composition occurred between stations and between the head and mouth of the river, suggesting particle retention due to either deposition, degradation, or biological consumption.

Simocybe ramosa, a New Species from the Boston Harbor Islands National Recreation Area

Simocybe ramosa, a New Species from the Boston Harbor Islands National Recreation Area

Ecotoxicology of Trace Elements in European Oyster (Ostrea edulis), Seawater, and Sedimentsacross Boston Harbor, Massachusetts,USA.

European oyster (Ostrea edulis) can be used for biological monitoring of water and sediment quality and serve as a conduit of trace elements to humans via consumption. Trace element concentrations in seawater, sediment, O. edulis edible tissues and shells from Boston Harbor were studied and found to be elevated relative to comparative studies in native ecosystems in the Adriatic Sea and Bay of Biscay. Average edible oyster tissues concentrations (mg/kg) were: arsenic 6, cadmium 1.7, cobalt 3.1, chromium 1.9, copper 153, mercury 0.265, nickel 1.8, lead 3.3, and zinc 2390. Arsenic was elevated in seawater and oyster shells. Mercury was elevated in sediments and oyster tissues. Lead was elevated in suspended sediments. Total Hazard Quotient (THQ) was < 1 but when summed across trace elements, THQ was nominally > 1 for all sites. Further study is warranted to determine mechanisms and spatial extent of bioaccumulation.

Prevalence and effects of a parasitic trematode on the blue mussel, Mytilus edulis, in the Boston Harbor

The blue mussel, Mytilus edulis, is a keystone species in the North Atlantic that plays critical roles in nutrient cycling, water filtration, and habitat creation. Blue mussel populations have declined significantly throughout the North Atlantic due to various factors, including habitat loss, pollution, increasing water temperature, and parasites. One parasite is Proctoeces maculatus, a digenetic trematode, which uses M. edulis as an intermediate host. This parasite causes reduced growth, castration, and death in mussels. The range of P. maculatus has expanded northward from Cape Cod, MA to Maine which may be associated with rising temperatures in the Gulf of Maine. To evaluate the negative impacts of P. maculatus on mussels, we analyzed its infections in M. edulis throughout the Boston Harbor, MA. P. maculatus was present in every population and time point analyzed, with approximately 50% of mussels in the harbor infected. The parasite reduced gonadal development in infected mussels, which could lead to decreased fecundity. Severe P. maculatus infections induced a stress response, indicated by increased HSP70 expression. We developed a non-destructive hemolymph-based assay to determine if mussels are infected with P. maculatus, thus speeding up the evaluation process and eliminating the need to sacrifice individuals. With P. maculatus’ continued expansion northward, more mussel populations will be under threat from this parasite.

Discount Rate Selection for Investments in Climate Change Adaptation and Flood Risk Reduction Projects

The selection of an appropriate discount rate is a critical yet often neglected aspect of valuing flood protection and climate adaptation projects. We examine current discounting practices in flood risk management and climate adaptation literature and compare these practices with a proposed fair market value (FMV) discounting approach, in which we discount project cash flows based on their levels of systematic market risk, consistent with practice in the private sector. Using publicly available data, we demonstrate minimal correlation between flood risk–related cash flows and overall market returns, suggesting flooding-related cash flows are most appropriately discounted near the risk-free rate. We consider the example of a proposed storm surge barrier in Boston Harbor and compare prevailing public-sector discounting approaches with this FMV approach. Our results suggest prevailing discounting approaches systematically undervalue flood risk reduction benefits and climate adaptation investments relative to the private-sector valuation implied via the FMV approach.

Quantifying coastal ecosystem trophic state at a macroscale using a Bayesian analytical framework

One of the goals of coastal ecological research is to describe, quantify and predict human effects on coastal ecosystems. Broad cross-systems assessments to classify ecosystem status or condition have been developed, but are not updated frequently, likely because a lot of information and effort is needed to implement them. Such assessments could be more useful if the probability of being in a class indicating status or condition could be predicted using widely available data and information, providing a useful way to interpret changes in underlying predictors by considering their expected impact on ecosystem condition. To illustrate a possible approach, we used chlorophyll-a as an indicator of condition, in place of the intended comprehensive condition assessment. We demonstrated a predictive approach starting with a random forest model to inform variable selection, then used a Bayesian multilevel ordered categorical regression to quantify a coastal trophic state index and predict system status. We initially fit the model using non-informative priors to water quality data (total nitrogen and phosphorus, dissolved inorganic nitrogen and phosphorus, secchi depth) from 2010 and a regional factor. We then updated the model using prior distributions based on posterior parameter distributions from the initial fit and data from 2015. The Bayesian model demonstrates an intuitive way to update a model or analysis with new data while retaining the benefit of prior knowledge and maintaining flexibility to consider new kinds of information. To illustrate how the model could be used, we applied our developed trophic state index and classification to a time series of water quality data from Boston Harbor, a coastal ecosystem that has undergone significant changes in nutrient inputs. The analysis shows how water quality status and trends in Boston Harbor can be understood in the comparative ecological context provided by data from estuaries around the continental US and illustrates how the analytical approach could be used as an interpretive tool by non-practitioners of Bayesian statistics as well as a framework for further model development and analysis.

Exploration of Marine Lichenized Fungi as Bioindicators of Coastal Ocean Pollution in the Boston Harbor Islands National Recreation Area

This preliminary exploration of marine lichenized fungi (lichens) as bioindicators of water pollution examined the distribution of intertidal lichen communities in the Boston Harbor Islands National Recreation Area with respect to recorded pollution throughout the harbor. We found significant negative associations between pollution measurements and the health of the lichen community based on cover and species richness. We also observed significant differences in species composition between areas of higher pollution and areas of lower pollution, though not enough data are available to establish the pollution sensitivity or tolerance of individual species. We note that difficulties in the collection and identification of marine lichens hamper efforts to use them broadly as bioindicators. This study suggests that marine lichens could prove useful as bioindicators, but more research is needed to understand the differential effects of pollution on individual species as well as to establish practical procedures both for quantifying marine lichen community health and for widespread bioindication using marine lichens. Finally, one species collected during this study, Verrucaria ceuthocarpa, represents a first report for the Boston Harbor Islands National Recreation Area.

New species and records of Caulleriella, Chaetocirratulus and Chaetozone (Annelida, Cirratulidae) from continental shelf and slope depths of the Western North Atlantic Ocean

Seventeen species of cirratulid polychaetes, 13 new to science, are reported from continental shelf and slope depths of the western North Atlantic Ocean. The samples were collected as part of deep-water offshore reconnaissance surveys from New England to the Carolinas and long-term monitoring programs in Boston Harbor, Massachusetts Bay, and Georges Bank off Massachusetts. The new species are included in the genera Caulleriella (C. cryptica n. sp.), Chaetocirratulus (C. hessleri n. sp., C. sandersi n. sp., and C. tomaculus n. sp.), and Chaetozone (C. adunca n. sp., C. artaspinosa n. sp., C. brychiata n. sp., C. castouria n. sp., C. donerae n. sp., C. lophia n. sp., C. novagracilis, n. sp., C. paucispinosa n. sp. and C. profunda n. sp. In addition, Chaetozone gayheadia Hartman, 1965 is redescribed based on type-material and additional collections and transferred to the genus Chaetocirratulus. Chaetozone benthaliana McIntosh, 1985 is designated a species inquirendum because it was described from a posterior fragment that cannot be confirmed as belonging to any known cirratulid genus or species. Updated descriptions and new records are provided for Chaetozone anasima, C. diodonta, and C. hystricosa all originally described by Doner Blake (2006).

Looking More Carefully: A Successful Bioblitz Orientation Activity at an Urban Public University

A college freshman orientation activity incorporating citizen science was designed and implemented by a partnership between the University of Massachusetts Boston and the National Park Service. The goals of this study were to create an engaging citizen science experience for first-year college students who did not have prior background in the field, and to iterate and improve the activity (three consecutive summers, 2017–2019) so as to generate insights that may improve future citizen science projects. Over three years, students (468 total) largely unfamiliar with citizen science (92.6%) or iNaturalist (97.9% first-time users) employed the iNaturalist app to document the biodiversity of Thompson Island in Boston Harbor. Student outcomes were assessed using pre- and post-surveys, and survey data indicated that the bioblitz effectively engaged these students: More than 60% of students found the activity very or extremely engaging, and less than 1% found it not engaging. More than 70% of the students indicated they were somewhat, very, or extremely interested in learning about or participating in citizen science, and in returning to the Boston Harbor Islands, in the future. A similar percent also believed their data were somewhat, very, or extremely important to the islands and to the National Park Service. The students’ self-reported level of engagement and interest shows how a fruitful campus-community collaboration can excite students from across majors in a citizen science project. The three iterations of this activity allowed us to make changes over time and gain insights that may be helpful to the design of future citizen science projects.

Editorial

Editorial

Useful Biodiversity Data Were Obtained by Novice Observers Using iNaturalist During College Orientation Retreats

Citizen scientist platforms such as eBird and iNaturalist are dramatically increasing the biodiversity data available for scientific research. Questions remain about the validity of data collected by people with undefined credentials. However, few studies have examined the data quality of citizen science studies in detail. As part of an autumn orientation program, the Honors College at UMass Boston invited incoming students for a retreat on Thompson Island in Boston Harbor Islands National and State Park. One of their activities was a three-hour bioblitz using iNaturalist. We reviewed data collected from three autumn orientations (2017–2019) to evaluate the quality of the data and to examine the hypothesis that first-time users can contribute useful biodiversity observations. The students collected more than 2,000 observations and uploaded more than 5,700 photographs, mostly of plants (about 50%) and animals (40%). Approximately 50% of the observations became Research Grade by iNaturalist criteria. Errors in GPS data (ca 1–4%) did not always place observations automatically in the project. First-time users, presumably because they are digital natives and have experience with cell phone cameras, quickly master the basics of iNaturalist. We conclude that students using the iNaturalist platform, with a crowd-sourced ID process, produce data that are useful for a variety of biodiversity studies.

80 “Minutes away, worlds apart”: The changing imagination of the Boston Harbor Islands

The Boston Harbor Islands are a historically urban archipelago. Since its founding in 1630, the city of Boston has embedded them firmly in its urban infrastructure. The islands have served as sources of wood and building stone, common pastures, sites of harbor defenses and lighthouses, and as ‘dumping grounds’ for materials, businesses, and institutions undesirable in the city proper. In the middle third of the twentieth century, however, Bostonians imagined their city’s harbor islands in a new way: one that has obscured most of their long human history and has cast them in the role of a natural landscape fundamentally different from the city. This changing perception resulted in the islands recently becoming places reserved almost exclusively for conservation and recreation. This article explores the way in which a certain kind of island narrative that frames islands as isolated, extraordinary places of mystery and adventure came to dominate the imagination of Boston’s previously mundane urban islands.

Introduction to a Special Issue—Boston Harbor Islands National Recreation Area: Overview of Recent Research

Introduction to a Special Issue—Boston Harbor Islands National Recreation Area: Overview of Recent Research

Heat budget model facilitates exploration of thermal ecology on urban shoreline infrastructure

Ecological engineering approaches have been shown to enhance the abundance and species diversity of intertidal organisms living on urban shoreline infrastructure (i.e., bulkheads and seawalls). Ecological studies have long shown the overarching importance of temperature in driving the physiology and survival of these organisms, yet we often do not fully understand what these temperatures are on engineered surfaces, as they can be very different from air or water temperature. The current study used a heat budget model to estimate surface temperature on bulkheads of different construction materials and surface orientations as a potential factor controlling the abundance and distribution of algal and invertebrate species living on armored shorelines. A Land Surface Model previously adapted for mussel beds was modified to incorporate the physical and thermal properties of three construction materials commonly used in shoreline armoring: concrete, granite and steel. Hourly temperature, tide and solar elevation data for Boston, MA, USA were used to simulate temperatures on a total of twelve model surfaces representing each construction material with north, east, south, and west surface orientations, respectively, over a period of 5 years (2014–2018). A rapid species assessment of intertidal epibiota on bulkheads in Boston Harbor provided baseline data about ecological communities that might be targeted in enhancement efforts, and information on physiological sensitivities of key species was determined from published literature. Comparisons between these sensitivities and exposures estimated from the model showed that simulated surface temperatures can exceed the physiological limits of local species but that this depends on surface orientation and material properties of the structure. Results further highlight the influence of material properties (density, specific heat capacity and thermal conductivity) of engineered structures on the incidence and severity of thermal extremes when exposed to direct solar radiation at low tide. Significant differences in the duration and intensity of high temperature values among model surfaces demonstrate that the potential effectiveness of choices in bulkhead construction materials designed to mitigate thermal extremes are likely most effective on south- and west-facing surfaces where incident solar radiation is highest. The ability to predict thermal extremes on existing or planned coastal development projects can improve and further refine ecological enhancement initiatives on shoreline infrastructure. Such collaborations would enable coastal zone managers, shorefront property owners, ecologists, and designers to co-design structures that create physiologically tolerable temperatures as a basis for ecological enhancement.

Long-Term Coastal Breeding Bird Monitoring in the Boston Harbor Islands, 2007–2019

Long-Term Coastal Breeding Bird Monitoring in the Boston Harbor Islands, 2007–2019

Bioblitz Assessment of Rocky Intertidal Biodiversity within the Boston Harbor Islands National Recreation Area

Bioblitzes are rapid assessments of local biodiversity that provide opportunities for science, outreach, and management. Here, we present results from a bioblitz motivated by the National Park Service All Taxa Biodiversity Inventory to catalog species diversity in the rocky intertidal zones of the Boston Harbor Islands National Recreation Area. Through a combination of structured, quantitative surveys and opportunistic sampling, public participants, experienced scientists, and naturalists worked together to identify more than 130 species in the rocky intertidal zones of 8 of the Boston Harbor Islands. Sampling by experts alone yielded greater diversity than sampling conducted in collaboration with public participants. However, quantitative, structured sampling by expert-only and collaborative expert–public teams both revealed the expected negative relationship between algal species richness and intertidal elevation, suggesting that, with structure, public bioblitzes can feasibly document ecological patterns. We discuss these results in the context of rocky intertidal ecology, island biogeography, and the role of technology in the growing popularity of bioblitzes as a tool for collaborative engagement of scientists and the public in the study and management of natural systems.

Conservation practice insights from a comparative case study of two shoreline stabilization projects in Boston Harbor, MA

AbstractAs sea levels rise and the frequency of flooding events increases, so do efforts to stabilize coastal shorelines. Nature‐based solutions to shoreline stabilization (“green” solutions, as opposed to traditional “grey” shoreline hardening) have been increasingly adopted in the Gulf of Mexico and mid‐Atlantic regions of the United States, but they are only beginning to be implemented, documented, and understood in the northeastern United States. This case study contrasts two shoreline stabilization projects directly across from each other on the banks of the Mystic River, Boston Harbor, MA. These two projects, one private and one public, employ a spectrum of green‐grey shoreline stabilization techniques. Originally planned as traditional grey shoreline stabilizations, both projects shifted toward greener solutions due to local environmental group advocacy, highlighting the influence of outside groups as advocates for nature‐based solutions. This study documents the evolution of both projects, highlighting common challenges in permitting and vegetation maintenance, as well as critical differences in project goals, funding sources, and biodiversity impacts.

Guest Editorial 2020 Custom Integrated Circuits Conference

This Special Issue of the IEEE JOURNAL OF SOLID-STATE CIRCUITS features expanded versions of key articles presented at the 2020 Custom Integrated Circuits Conference (CICC), one of IEEE’s first conferences to go fully virtual due to the corona virus pandemic, from March 22 to March 25, 2020. Originally planned to be held at Hyatt Boston Harbor, Boston, MA, USA, growing concerns related to COVID-19 and the impact on the community’s ability to travel to the conference lead the conference organization to make the tough decision in January 2020 to go for a fully virtual format. The dates and schedule of the conference remained unchanged.

Xylariales (Sordariomycetes, Ascomycota) of the Boston Harbor Islands

The Xylariales (Sordariomycetes, Ascomycota) is an order of mostly stromatic perithecial fungi generally inhabiting wood and other plant debris, as well as some important plant pathogenic species. As a follow-up to an extensive fungal inventory conducted by D. Haelewaters and colleagues since December 2012 at the Boston Harbor Islands National Recreation Area in Massachusetts, I examined members of the Xylariales in detail, including previously unreported collections. I constructed keys for included taxa, and I provide species notes, references, substrate, and collecting data of the following Xylarialean genera: Diatrype, Eutypa, Eutypella (Diatrypaceae); Biscogniauxia, Camillea, Graphostroma (Graphostromataceae); Annulohypoxylon, Daldinia, Hypomontagnella, Hypoxylon, Jackrogersella (Hypoxylaceae); Lopadostoma (Lopadostomataceae); and Entoleuca, Kretzschmaria, Nemania, Rosellinia, Xylaria (Xylariaceae). I herein formally describe a new species, Xylaria finismundoensis sp. nov., based on combined morphology and multi-locus phylogenetic analysis. This taxon provides the first evidence of a saprotrophic lifestyle for members of the E9 phylogenetic clade of Xylaria, previously only known as endophytes.