The invasive tunicates now noted on Maine’s coast include Styela clava, Ciona intestinalis, Ascidiella aspersa, Didemnum vexillum, Botrylloides violaceus, Botryllus schlosseri, and Diplosoma listerianum. Warming Gulf of Maine waters have allowed tunicates to grow quickly in many parts of the coast, and they’re less susceptible than many invertebrates to ocean acidification and low-oxygen events. They spread via ballast water, on boats and mobile gear, and by fragments reattaching, while having few local predators. Their rapid growth enables them to compete for space and food, displacing native species and colonizing man‑made structures such as docks, ropes, and fishing gear.
CurioWire Answers
Nature questions and answers
A focused collection of clear answers connected to CurioWire nature stories and nearby search topics.
Showing 27 nature questions.
The most effective steps are to remove gear from the water and let it dry before scraping, because tunicates cannot survive desiccation; significant rainfall can also reduce them. Avoid scraping colonies back into the water, which fragments and spreads them. Pressure washing should be done onshore to prevent re‑introduction. White vinegar spray has been identified as a treatment for Styela clava and Botrylloides violaceus on aquaculture equipment and mussels. Containing spread by identifying infested areas and restricting gear movement is recommended, as once established tunicates are difficult to contain and nearly impossible to eradicate. These practices emphasize prevention and careful onshore cleaning rather than in‑water removal.
Established vase tunicate (Ciona intestinalis) populations in Nova Scotia and Prince Edward Island have reduced mussel farm productivity by growing densely on ropes, nets, and the mussels themselves, making fouled gear harder to handle and increasing crop losses. Farmers must remove tunicates after harvest and sometimes before, adding time and cost. Management techniques in use include pressure washing, brine dips, liming, ultraviolet treatment, and electric shocks; however, once established the species remains persistent and has, in extreme cases, driven farms out of business. Research is also identifying environmental indicators (e.g., salinity, temperature, pH, water movement) to guide site selection and reduce infestation risk.
Since the early 1980s, the Gulf of Maine’s annual sea-surface temperature anomaly has risen about 0.41°C per decade—more than 2.5 times the global average of 0.15°C per decade—and its 1982–2021 warming rate is faster than 96.2% of the world’s oceans. GMRI also reports summertime warming of roughly 0.55°C per decade (1982–2021), accelerating to 0.63°C per decade in 2011–2021. The region has experienced frequent marine heatwaves and a persistent shift toward higher summer temperatures since 2007. These metrics are derived from NOAA satellite data and highlight the Gulf’s status among the planet’s fastest‑warming ocean regions.
Marine biofouling is a major vector for transferring invasive aquatic species via ship hulls, threatening biodiversity and causing significant economic impacts to sectors like fisheries, aquaculture, and coastal infrastructure. It also increases hull resistance, raising fuel costs and air and greenhouse gas emissions. To reduce these risks, the International Maritime Organization adopted revised Biofouling Guidelines in 2023 (MEPC.378(80)) to give a globally consistent approach to managing hull fouling. The IMO notes that bio‑invasions are ongoing at an alarming rate and that effective biofouling management can both curb species transfer and improve ships’ energy efficiency.
Circalunar rhythms are roughly monthly biological clocks that synchronize reproduction in many animals. A review of monthly clocks documents well-studied cases including mass spawning of corals (Acropora) around full moons, the annelid worm Platynereis timing reproduction to the waxing moon, precise emergence of the midge Clunio at neap tides, and fishes such as California grunion and the goldlined spinefoot spawning on lunar schedules. The evolutionary advantage is reliable timing against recurring environmental cues—light, tides, and season—so gametes or offspring encounter optimal survival conditions and conspecifics, boosting reproductive success and coordination across a population.
Artificial lighting disorients hatchlings by overpowering their instinct to crawl toward the brightest horizon, drawing many away from the ocean and causing thousands of deaths each year in Florida. On natural beaches, hatchlings orient toward the bright open sky over the water and away from dark dunes, but nearby lamps and building lights appear overwhelmingly bright, so hatchlings ignore other cues and head inland or linger under lights where predators concentrate. Wildlife agencies recommend dark, shielded, or turtle‑friendly lighting and reducing visible light on nesting beaches to prevent misorientation and improve hatchling survival.
Researchers deployed drones and modeling to verify the world’s largest freshwater turtle aggregation, counting over 41,000 giant South American river turtles (Podocnemis expansa) during a 12‑day nesting season along the Guaporé River on the Brazil–Bolivia border. Aerial surveys provided high‑resolution imagery of crowded sandbanks that are hard to monitor from the ground, offering a scalable way to estimate numbers and track trends in remote areas. The approach strengthens conservation by quantifying the size and timing of synchronized mass nesting events and helps prioritize protection of key nesting beaches.
Predator satiation is an anti‑predator strategy in which prey appear in very high numbers over a short time so each individual’s chance of being eaten drops. When predators are flooded with potential prey, their consumption quickly plateaus, creating a safety‑in‑numbers effect. This mechanism is documented across taxa, from periodical cicadas emerging en masse to masting plants that produce heavy seed crops in some years. The same principle explains why tightly synchronized births or hatchling emergences can confer survival benefits: predators can only capture so many during the brief peak.
The Lomb–Scargle periodogram detects periodic signals in unevenly spaced observations, making it well suited to testing for cycles in irregular ecological datasets. Unlike standard Fourier methods that assume even sampling, Lomb–Scargle analyzes power at candidate frequencies directly from the actual observation times, helping reveal rhythmic patterns without interpolating missing days or nights. It is a widely used statistical tool in time‑series analysis and can quantify whether a repeated signal—such as a monthly rhythm—is present despite gaps or variable sampling intervals.
Seed-based restoration succeeded in Virginia by using a high-volume harvest-and-broadcast method that turned 71 million eelgrass seeds sown on 498 acres into meadows now covering more than 6,195 acres. Developed by the Virginia Institute of Marine Science, the approach identified prime areas for seed distribution and produced rapid expansion once plants established. NOAA notes these methods may be transferable to other regions. As the meadows returned, they improved water quality by trapping fine sediments, provided habitat for juvenile fish and crabs, and supported a bay scallop reintroduction effort with more than 200,000 scallops reared and a growing wild population reported in 2017.
Seagrass can capture carbon from the atmosphere up to 35 times faster than tropical rainforests. UNEP also reports that, despite covering only about 0.2% of the seafloor, seagrasses account for roughly 10% of the ocean’s carbon storage. This makes seagrass a potent blue carbon sink with high mitigation potential when conserved and restored. UNEP highlights growing international interest in incorporating seagrass conservation into climate strategies, while noting that restoration tends to succeed at larger scales and that conserving existing meadows is often the most efficient first step due to restoration cost and complexity.
New York’s environmental agency detected a coccidian parasite in Peconic Bay scallops and identified it as a contributing cause of the 2019 mass mortality. Scientists also theorized that physiological stress during spawning was exacerbated by mid‑80s summer water temperatures and low dissolved oxygen, conditions consistent with the die-off’s timing. The event caused more than 90% adult mortality in many areas and prompted the state to seek a federal fishery disaster declaration. The bulletin notes the parasite poses no human health risk but can significantly impact the fishery, and further research on its ecology is underway.
Eelgrass has shrunk primarily due to marine heatwaves and poor water clarity, cutting its area by about half as mean summer temperatures increasingly exceed its ~25°C limit. At the same time, nutrient reductions improved clarity enough for heat‑tolerant widgeongrass to expand and replace eelgrass as the dominant seagrass. Researchers emphasize that widgeongrass responds differently to stressors—resisting heat but vulnerable to spring runoff that clouds the water—creating new management challenges. The shift underscores how climate-driven heat stress and watershed‑driven turbidity interact, requiring species‑specific monitoring and strategies to maintain seagrass habitat and the fauna that depend on it.
They are becoming more frequent because a warming Arctic is shifting precipitation from snow to rain and increasing open-water moisture, which promotes rainy conditions that refreeze into ground-icing. Climate-model analysis (CMIP6) shows faster, larger increases in Arctic rainfall than earlier models, with rainfall rising alongside Arctic amplification and expanded open water. The study notes that this earlier transition to a rain-dominated regime will raise the frequency of rain‑on‑snow events, which can be devastating for reindeer and other wildlife. Increased vertically integrated moisture transport and reduced snowfall further set the stage for more frequent icing after thaws refreeze.
They survive by foraging mainly kelp on the shoreline, an adaptation enforced by a stone dyke that confines the breed to the foreshore. The sheep time feeding to low tides, primarily eating Laminaria digitata and L. hyperborea, and unusually tend to fatten in winter when storms deliver more kelp. Physiological changes support this diet: they extract copper far more efficiently than other breeds (making them vulnerable to copper-rich grass feeds) and are notably tolerant of salt. This seaweed-based niche makes them one of the few terrestrial mammals to rely almost entirely on marine algae as food.
Researchers combine annual ground-based counts and carcass surveys with modern tools such as GPS collars, drones, cameras, and satellites to track reindeer habitat use and survival through icy winters. The Norwegian Polar Institute’s COAT program also maintains climate stations along coastal–inland gradients to link weather and snow conditions with reindeer demography and movements. While remote sensing helps quantify vegetation timing and productivity, foot surveys remain essential for detecting marked individuals and assessing winter mortality after rain-on-snow episodes that lock pastures under ice.
Severe icing can seal vegetation under ice, causing starvation and mass die-offs that ripple through herds for years. The National Snow and Ice Data Center documents that rain‑on‑snow events form impenetrable ice layers over forage; a 2013 event on Russia’s Yamal Peninsula led to the starvation of 61,000 reindeer from a herd of 275,000. Such icing crises deplete fat reserves, reduce pregnancies, and depress calf recruitment, with long-lasting effects on herd size and the communities that depend on them.
Yes. A Journal of Zoology study on the Isle of Rum found red deer using seaweed habitats, detailing diet selection, timing of seaweed use with tides, and differences among individuals and sexes. Notably, seaweed use by adults correlated with that of their mothers, implying learned behavior. The research examined when deer exploited wrack beds relative to tidal cycles and how males and females used different sites, indicating that seaweed can be a structured, supplemental winter resource for a large terrestrial herbivore.
El Niño raises bleaching risk by driving prolonged, widespread sea-surface warming that exceeds bleaching thresholds. During the strong 1997–1998 El Niño, NOAA’s Coral Reef Watch observed sustained high temperatures linked to severe bleaching across many regions, with bleaching-level warming reaching the Great Barrier Reef in February–March 1998. As conditions shifted rapidly to La Niña in mid‑1998, heat stress appeared in other western Pacific areas, extending the window of impact. This historical pattern explains why managers track ENSO phases alongside thermal alerts: the sequence and geography of ENSO-related warming can signal when and where reefs are most vulnerable and guide in‑water responses.
Yes. A NOAA summary of research on the Florida Keys Reef Tract reports that while abundances of other coral species have declined, the relative abundance of Porites astreoides has increased. The study focused on the genetic structure and diversity of this coral and notes its growing prominence as reefs have been disturbed. This trend matters for reef futures because changes in dominant species can alter growth forms and reef-building capacity, potentially reshaping habitat for fishes and invertebrates. Tracking which species are rising or falling helps managers anticipate structural changes and tailor restoration or protection strategies accordingly in Florida and similar Caribbean settings.
Managers boost recovery by identifying and protecting key algae‑grazing fishes that keep seaweeds in check and open space for corals to settle. NOAA Fisheries developed a tool that uses species’ bite rates, bite sizes, and diet to estimate how much algae each herbivore removes, helping prioritize conservation of the most effective grazers. Larger herbivores generally consume more algae, and parrotfish scraping can expose fresh substrate that facilitates coral recruitment. By managing herbivore populations as a functional group—alongside broader actions on climate and water quality—reefs gain a better chance to resist algal overgrowth and recover after disturbances such as bleaching.
Coral IVF collects spawn during annual mass events, rears millions of larvae in specially designed enclosures or tanks, then delivers them onto damaged reefs to restore breeding populations. The approach was first trialed on Heron Island in 2016, with researchers returning the following year to assess progress and add more coral “babies.” Subsequent trials expanded north to Moore Reef near Cairns in 2018 and 2019. The goal is to repair reefs where natural larval supply is compromised so outplanted juveniles can grow to reproductive size and re‑seed the area, complementing broader management of climate and local stressors.
They remove and destroy infested trees, survey within quarantined areas, and only declare eradication after required survey cycles find no beetles. APHIS specifies that infested trees cannot be saved and must be chipped or incinerated, while movement of host materials is restricted under quarantine. To declare eradication, a final round of negative surveys and all control and secondary surveys must be completed, with a minimum of four years between initial detection and completion of the final survey cycle. APHIS also outlines how quarantines are set, enforces compliance agreements, and coordinates with state partners to prevent spread and confirm elimination.
Emerald ash borer larvae feed beneath bark in S‑shaped galleries that sever the tree’s circulatory system, while Asian longhorned beetle larvae tunnel through the vascular system and heartwood, eventually killing host trees. The National Park Service warns EAB could be as devastating to U.S. ash as chestnut blight was to American chestnut, underscoring the scale of potential urban canopy loss. Both pests threaten shade, cooling, and habitat benefits in cities, but they differ in tissue attacked and host range, shaping detection approaches and which neighborhoods—those rich in ash versus diverse hardwoods—are hit first and hardest.
APHIS regulates wood packaging material as a known pathway by requiring it be heat treated or fumigated before import under Title 7, section 319.40 of the Code of Federal Regulations, and it inspects international baggage and cargo at entry. These measures aim to prevent new introductions like those that likely brought ALB to the United States. In addition, the agency surveys, sets quarantines, and restricts movement of host materials around known infestations. Together, import treatment rules and domestic quarantines reduce the chance that infested pallets or crates could seed new urban outbreaks.
The 10-20-30 rule recommends that no more than 10% of an urban tree population be a single species, no more than 20% a single genus, and no more than 30% a single family. Penn State Extension advises building diversity into community plantings using this guideline so street and park trees aren’t dominated by a few taxa. Cities use the rule as a practical benchmark to review inventories and plan replacements, helping distribute risk across many kinds of trees and supporting long‑term, adaptable urban forests.