Abundance and diversity of ascidians in the southern Gulf of Chiriquí, Pacific Panama

© The Author(s), 2011. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Aquatic Invasions 6 (2011): 381-390, doi:10.3391/ai.2011.6.4.03.Little is known about the ascidian fauna of Pacific Panama. Ascidian surveys were conducted in the southern Gulf of Chiriquí on the Pacific coast of Panama in January 2008 and 2009. Surveys along linear transects at 2-3 m depth (snorkel, 2008) and 5 and 12 m depth (SCUBA, 2009) were conducted at multiple sites within a chain of islands extending out from the mainland. Twelve different ascidian taxa were observed with mean densities of up to ~17 ascidians m-2. The most abundant species was Rhopalaea birkelandi. Two of the most abundant taxa (Ascidia sp., Pyura sp.) appear to represent previously undescribed species. Several species of didemnids were also abundant. Ascidians were most abundant near the coast of the mainland and were less abundant near the islands farthest offshore. These data on Panamanian ascidian communities provide a baseline of local biodiversity against which it will be possible to determine whether the communities change over time, if additional species become introduced to the region, or if native Panamanian species become invasive in other parts of the world.This research was supported by Ocean Life Institute Exploratory Grant (250513.38) to Carman and Sievert, Tropical Research Initiative Grant (253750.09) to Carman, Molyneaux and Sievert, a University of Hartford International Center Faculty Grant to Bullard, and CNPq senior postdoctoral grant to Rocha (200914/2008-1)

Ascidians at the Pacific and Atlantic entrances to the Panama Canal

© The Author(s), 2011. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Aquatic Invasions 6 (2011): 371-380, doi:10.3391/ai.2011.6.4.02.The Panama Canal region is susceptible to non-native species introductions due to the heavy international shipping traffic through the area. Ascidian introductions are occurring worldwide but little is known about introductions at the Panama Canal. Surveys were conducted in 2002, 2008, and 2009 within the Pacific and Atlantic entrances to the canal. We found a high diversity of ascidians on both sides of the canal, dominated by non-native species; six species occurred at both Pacific and Atlantic Panama sites. This is the first report of Polyandrocarpa anguinea and P. sagamiensis in Atlantic Panama waters and Ascidia incrassata, Ascidia sydneiensis, Botrylloides nigrum, Botryllus planus, Didemnum perlucidum, Diplosoma listerianum, Microcosmus exasperatus, Polyandrocarpa zorritensis, Polyclinum constellatum, Symplegma brakenhielmi, Symplegma rubra, and Trididemnum orbiculatum in Pacific Panama waters. The canal may serve as a major invasion corridor for ascidians and should be monitored over time.Funding for this project came from WHOI Ocean Life Institute-Tropical Research Initiative to Carman and CNPq to Rocha

The colonial ascidian Didemnum sp. A: Current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America

Author Posting. © The Author(s), 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Journal of Experimental Marine Biology and Ecology 342 (2007): 99-108, doi:10.1016/j.jembe.2006.10.020.Didemnum sp. A is a colonial ascidian with rapidly expanding populations on the east and west coasts of North America. The origin of Didemum sp. A is unknown. Populations were first observed on the northeast coast of the U.S. in the late 1980s and on the west coast during the 1990s. It is currently undergoing a massive population explosion and is now a dominant member of many subtidal communities on both coasts. To determine Didemnum sp. A’s current distribution, we conducted surveys from Maine to Virginia on the east coast and from British Columbia to southern California on the west coast of the U.S. between 1998 and 2005. In nearshore locations Didemnum sp. A currently ranges from Eastport, Maine to Shinnecock Bay, New York on the east coast. On the west coast it has been recorded from Humboldt Bay to Port San Luis in California, several sites in Puget Sound, Washington, including a heavily fouled mussel culture facility, and several sites in southwestern British Columbia on and adjacent to oyster and mussel farms. The species also occurs at deeper subtidal sites (up to 81 m) off New England, including Georges, Stellwagen and Tillies Banks. On Georges Bank numerous sites within a 147 km2 area are 50-90% covered by Didemnum sp. A; large colonies cement the pebble gravel into nearly solid mats that may smother infaunal organisms. These observations suggest that Didemnum sp. A has the potential to alter marine communities and affect economically important activities such as fishing and aquaculture.Funding for this project was provided by EPA (STAR) grant GZ1910464 to R.B. Whitlatch, NSF-DGE 0114432 to J. Byrnes, NSF-OCE 0117839 to R. Etter and R.J. Miller, MIT Sea Grant NA86RG0074 and USEPA Grant GX83055701-0 to J. Pederson. RI Sea Grant NA07R90363 to J.S. Collie. Funding for A.N. Cohen and G. Lambert was provided by Mass. Sea Grant, U.S. EPA, Smithsonian Envl. Research Center Invasions Lab, Natl. Geographic Soc., San Francisco Bay-Delta Science Consortium and CALFED Science Program, Calif. Coastal Conservancy and the Rose Foundation. Additional funding and support was provided by the Stellwagen Bank National Marine Sanctuary

Plankton tethering to assess spatial patterns of predation risk over a coral reef and seagrass bed

© Inter-Research 2002: www.int-res.comDOI: 10.3354/meps225017Difficulties associated with manipulating plankton in situ have limited the ability of investigators to assess among-habitat variation in predation risk for plankton. We used plankton tethering units (PTUs) to tether zooplankton in a variety of reef and seagrass habitats, and used field and laboratory assays to test PTUs for tethering artifacts. Tethering did not affect the survivorship of 5 species of plankton (sizes <1 to 6 mm), indicating that the method works with a range of planktonic organisms. We then used the reef mysid Mysidium columbiae in additional assays and found that: (1) mysids remained on PTUs unless they were attacked by predators; (2) PTUs did not prevent planktivorous fishes from consuming tethered mysids; (3) untethered mysids commonly evaded predators, while mysids on PTUs did not; (4) the same types of predators consumed untethered and tethered mysids in the field; and (5) fishes were neither attracted to nor repelled from PTUs. We used PTUs and mysids to assess predation risk for plankton over various coral reef or seagrass habitats. Risk of attack varied among habitats and was correlated with abundance of planktivorous fishes. On the reef, attack rates were most intense over a topographically complex reef ledge, less intense over the less structurally complex center of the reef, and least intense over a structurally simple sand plain. Within the seagrass bed, attack rates were highest at the edge of the bed and less intense to the center of the seagrass bed and over an adjacent sand plain. Thus, attack rates at these sites varied tremendously over small spatial scales (meters)

All for one and one for all: research from the 6th International Invasive Sea Squirt Conference and the 10th International Conference on Marine Bioinvasions

© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Dias, P. J., Carman, M. R., & Bullard, S. G. All for one and one for all: research from the 6th International Invasive Sea Squirt Conference and the 10th International Conference on Marine Bioinvasions. Management of Biological Invasions, 10(4), (2019): 597-601, doi: 10.3391/mbi.2019.10.4.01.It has been 20 years since the foundation of a dedicated International Conference on Marine Bioinvasions in 1999 (ICMB-I, Massachusetts Institute of Technology, Cambridge, MA, USA). Amongst the most prominent driving factors behind this were the invasion of the Great Lakes by the zebra mussel Dreissena polymorpha Pallas, 1771 in the 1980s and reports of an average of one new species invading San Francisco Bay every 14 weeks between 1961 to 1995 (Cohen and Carlton 1998). At this time, scientists were becoming well aware of the growing number of introductions worldwide and their impacts on marine communities (Minchin 1996; Reise et al. 1998; Hewitt et al. 1999; Sliwa et al. 2009). Ascidians, commonly known as sea squirts, were quickly flagged as one of the most notorious and diverse group of fouling species being transported and introduced around the world (Shenkar and Swalla 2011). Indeed, in the late 1990s and early 2000s, invasive ascidians were identified as important players causing significant ecological and economic impacts to marine systems (Coles et al. 2002; Lambert 2002). As the twenty-first century enters its third decade, invasive ascidians continue to affect ecosystems (Carman et al. 2011; Shenkar 2012; Zhan et al. 2015), create problems for aquaculture (Muñoz and McDonald 2014; McKenzie et al. 2017), and frequently dominate coastal fouling communities (López-Legentil et al. 2015).The ICMB-X was supported by CONICET, MINCyT, SCTeIP Chubut, Consejo Federal de Inversiones, Biodiversity Heritage Library, Administración Portuaria de Puerto Madryn (APPM), Office of Naval Research Global, Aluar Aluminio Argentino, Madryn Bureau, Ente Mixto Puerto Madryn, Municipalidad de Puerto Madryn, FAO-GEF-SAyDS. Special acknowledgement to Yagui (Instagram: @yaguiart) for allowing the use of his artistic paintings on the background of the ICMB-X logo in banners, conference program, abstract book, reports, social media, etc. Ale Bortolus designed the logo for the Society for the Study of Marine Bioinvasions. The 6th IISSC was supported by sponsors Woods Hole Sea Grant and Oak Bluffs Shellfish Department and steering committee members Dr. Stephan Bullard, Dr. Jim Carlton, Dr. Phil Colarusso, Dr. Jeff Davidson, Dr. Cynthia McKenzie, Dr. Judith Pederson, and Dr. Page Valentine. Special gratitude is extended to Ellen Bailey who organized all IISSC conferences. Thank you too to Dr. Vadim Panov for his continued support in publishing papers from the conferences

Susceptibility of invertebrate larvae to predators: how common are post-capture larval defenses?

© Inter-Research 1999: www.int-res.comDOI:10.3354/meps191153Predation is believed to be a major source of mortality for larvae of benthic invertebrates, but the palatability of larvae commonly found in the water column has rarely been assessed. Larval palatability assays were conducted by collecting live invertebrate larvae from a temperate field site and offering them to a suite of common predators (the fishes Lagodon rhomboides, Leiostomus xanthurus, and Monacanthus hispidus and the hard coral Oculina arbuscula). By crushing larvae that were rejected intact and re-offering them to predators, it was possible to distinguish between defenses based on morphological and chemical characteristics of the larvae. Additionally, abundance data were collected for taxonomic groups of larvae at our sampling location. The majority of invertebrate larvae were palatable to consumers. Most predators readily consumed polychaete larvae, barnacle nauplii, bivalve veligers, shrimp zoeae, crab megalopae, phoronid actinotrochs, and hemichordate tornaria (which together accounted for 65% of meroplankton abundance), suggesting that these larvae lacked effective morphological or chemical defenses. Against at least 1 fish predator, a significant number of gastropod veligers, barnacle cyprids, crab zoeae, and stomatopod larvae (which accounted for 34% of meroplankton abundance) appeared to be morphologically defended. Larvae from these groups tended to be rejected whole, but were consumed by fishes once they were crushed. A significant number of nemertean pilidia, asteroid bipinnaria, and cnidarian planulae (which accounted for only 0.2% of meroplankton abundance) were rejected both whole and crushed, suggesting that some species or individuals within these taxa may be chemically defended. Thus, the majority of larvae from this assemblage of temperate meroplankton lacked physical or chemical defenses against potential predators (3 fishes and 1 cnidarian). Among the remaining larvae, physical resistance to predators was much more common than chemical resistance

Group-based meta-emotion and emotion responses to intergroup threat

This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. (DGE‐1144085).In a secularizing world, religious groups are increasingly threatened by anti‐religious groups. We present two studies investigating religious peoples’ responses to anti‐religious threats. We expected intergroup threats to shape group‐based emotions and behavioural intentions through a novel pathway whereby threat affects group‐based meta‐emotions: the ingroup’s perception of the outgroup’s emotions towards the ingroup. In Study 1, we experimentally manipulated threat and group salience with participants from two different cultures (British and Latinx/Hispanic). Study 1 demonstrated non‐interactive effects of threat increasing negative emotional responses and of group salience strengthening emotional responses. The results illustrated the role of group‐based meta‐emotions in predicting outgroup‐directed emotions and behavioural response intentions. Study 2 used a different manipulation of threat in an American sample and an identity‐based manipulation of salience to assess the impact of real‐world anti‐religious campaigns involving symbolic and realistic threats. Both threat types increased negative group‐based meta‐emotions, negative outgroup‐directed emotions, desire to respond, and opposition to the anti‐religious campaign compared to no threat. Overall, religious identity salience had little impact on outcomes. The indirect pathway through meta‐emotion replicated, suggesting the importance of considering this novel meta‐emotion pathway in intergroup relations.PostprintPeer reviewe

Relative quantification of wind erosion in argan woodlands in the Souss Basin, Morocco

The endemic argan woodlands cover large parts of South Morocco and create a characteristic landscape with areas of sparsely vegetated and bare soil surfaces between single trees. This unique ecosystem has been under extensive agrosilvopastoral management for centuries and is now at risk of degradation caused by overgrazing and increasing scarcity and variability of rainfall. To investigate susceptibility to wind erosion, we conducted an experimental–empirical study including wind tunnel tests and a drone-generated digital elevation model and quantified wind-erodible material on five different associated surface types by means of sediment catchers. The highest emission flux was measured on freshly ploughed surfaces (1875 g m–2 h–1), while older ploughed areas with a re-established crust produced a much lower emission flux (795 g m–2 h–1). Extensive tillage may have been a sustainable practice for generations, but increasing drought and uncertainty of rainfall now lead to an acute risk of severe soil erosion and dust production. The typical crusted surfaces characterized by residual rock fragment accumulation and wash processes produced the second highest emission flux (1,354 g m–2 h–1). Material collected from tree-shaded areas (933 g m–2 h–1) was revealed to be a considerable source of organic material, possibly affecting substrate conditions positively on a larger regional scale. The lowest flux was measured on rock fragment-covered surfaces (301 g m–2 h–1). The data show that open argan woodland may be a considerable source for wind erosion and dust production, depending on surface characteristics strongly related to management. An adapted management must include the conservation of argan trees to offer a promising approach to prevent severe wind erosion and dust production and mitigate possible impacts of land-use change and climate change related shifts in wind and rainfall patterns. © 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Lt

The ‘building paradox’: research on building-related environmental effects requires global visibility and attention

The construction and operation of buildings is a major contributor to global energy demand, greenhouse gases emissions, resource depletion, waste generation, and associated environmental effects, such as climate change, pollution and habitat destruction. Despite its wide relevance, research on building-related environmental effects often fails to achieve global visibility and attention, particularly in premiere interdisciplinary journals – thus representing a major gap in the research these journals offer. In this article we review and reflect on the factors that are likely causing this lack of visibility for such a prominent research topic and emphasise the need to reconcile the construction and operational phases into the physical unity of a building, to contribute to the global environmental discourse using a lifecycle-based approach. This article also aims to act as a call for action and to raise awareness of this important gap. The evidence contained in the article can support institutional policies to improve the status quo and provide a practical help to researchers in the field to bring their work to wide interdisciplinary audiences