Trends in Maine Softshell Clam Landings

Congleton, W.R.; Vassiliev, Tracy; Bayer, Robert C.; Pearce, Bryan R.; Jacques, Jennifer; Gillman, Carolyn

doi:10.2983/0730-8000(2006)25[475:timscl]2.0.co;2

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…Our period of data collection corresponded with the period of warming and subsequent cooling that began in 1942, the availability of these historical publications, and broader historical trends (i.e., a strong focus on World War II in fishing newspapers before 1945). Finally, in the Gulf of Maine region, we recorded all observations of invasive green crabs (Carcinus maenas, Portunidae), as this species was observed in the historical scientific literature as increasing due to warming waters (Glude, 1955;Weslch, 1969), and increased population abundances today have been observed to negatively affected soft-shell clam (Mya arenaria, Myidae) fisheries in New England (Congleton et al, 2006;McClenachan, O'Connor, & Reynolds, 2015b). We extracted analogous observations for our study region from this news source for the period of more recent warming (1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017).…”

Section: Mcclenachan Et Almentioning

confidence: 99%

“…In 1960, these two newspapers combined and expanded to cover the US Pacific Coast under the name National Fisherman, which continues as a commercial fisheries trade publication today. As high green crab abundances have been correlated with high January-March average SSTs for the preceding four years in Maine (Congleton et al, 2006), we used this subset of data to test the relationship between changing temperatures and observations of green crabs. We recorded articles that described changes to a fishery that were explicitly attributed to warming or cooling waters and any instances where warming or cooling waters were associated with direct impacts to fishing practices.…”

Section: Mcclenachan Et Almentioning

confidence: 99%

“…Additionally, we recorded all observations of novel species during the historical warming and cooling events, which we defined as those that were described as rarely or never previously seen in a locality. Finally, in the Gulf of Maine region, we recorded all observations of invasive green crabs (Carcinus maenas, Portunidae), as this species was observed in the historical scientific literature as increasing due to warming waters (Glude, 1955;Weslch, 1969), and increased population abundances today have been observed to negatively affected soft-shell clam (Mya arenaria, Myidae) fisheries in New England (Congleton et al, 2006;McClenachan, O'Connor, & Reynolds, 2015b). We compared both observations of novel species and invasive green crabs with average monthly sea surface temperature (SST) anomalies.…”

Section: Me Thodsmentioning

confidence: 99%

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Shifting perceptions of rapid temperature changes’ effects on marine fisheries, 1945–2017

et al. 2019

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Climate‐driven warming has both social and ecological effects on marine fisheries. While recent changes due to anthropogenic global warming have been documented, similar basin‐wide changes have occurred in the past due to natural temperature fluctuations. Here, we document the effects of rapidly changing water temperatures along the United States’ east coast using observations from fisheries newspapers during a warming phase (1945–1951) and subsequent cooling phase (1952–1960) of the Atlantic Multidecadal Oscillation, which we compared to similar recent observations of warming waters (1998–2017). Historical warming and cooling events affected the abundance of species targeted by fishing, the prevalence of novel and invasive species, and physical access to targeted species. Fishing communities viewed historical cooling waters twice as negatively as they did warming waters (72% vs. 35% of observations). Colder waters were associated with a decrease in fishing opportunity due to storminess, while warming waters were associated with the potential for new fisheries. In contrast, recent warming waters were viewed as strongly negative by fishing communities (72% of observations), associated with disease, reductions in abundances of target species, and shifts in distributions across jurisdictional lines. This increasing perception that warming negatively affects local fisheries may be due to an overall reduction of opportunity in fisheries over the past half century, an awareness of the relative severity of warming today, larger changes in American culture, or a combination of these factors. Negative perceptions of recent warming waters’ effects on fisheries suggest that fishing communities are currently finding the prospect of climate adaptation difficult.

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Section: Mcclenachan Et Almentioning

confidence: 99%

Section: Mcclenachan Et Almentioning

confidence: 99%

Section: Me Thodsmentioning

confidence: 99%

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Shifting perceptions of rapid temperature changes’ effects on marine fisheries, 1945–2017

et al. 2019

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“…The soft-shell clam, Mya arenaria L., is a native species with a wide latitudinal distribution along the Atlantic coast of North America, from Labrador, Newfoundland, to Georgia (Strasser 1999), which overlaps with areas affected by red tides. Throughout part of this range, Bay of Fundy to Chesapeake Bay, it can dominate the intertidal macrobenthos and supports valuable recreational and commercial fisheries (Congleton et al 2006). A clear link between the prior history of exposure to paralytic shellfish poisoning (PSP) of M. arenaria populations and their toxin resistance has been demonstrated (Bricelj et al 2004(Bricelj et al , 2005MacQuarrie and Bricelj 2008).…”

mentioning

confidence: 99%

Evidence of selection for resistance to paralytic shellfish toxins during the early life history of soft‐shell clam, Mya arenaria, populations

Bricelj

MacQuarrie

Doane

et al. 2010

Limnology & Oceanography

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This study identifies early, postmetamorphic soft-shell clams, Mya arenaria, as the life-history stage most susceptible to effects of blooms of paralytic shellfish poisoning (PSP) toxin-producing Alexandrium spp. Laboratory experiments used progeny from predominantly susceptible (naïve) or resistant (annually exposed) NW Atlantic populations. Growth and survival of toxified veliger larvae did not differ from those fed nontoxic algae. In contrast, postlarvae (4-12-mm shell length) from both populations exposed to a highly toxic Alexandrium tamarense isolate (, 100 cells mL 21 , 64-69 pg saxitoxin equivalents [STXeq] cell 21 ) suffered burrowing incapacitation, toxin accumulation, and mortalities within 1 week of toxin exposure. These effects were greater and occurred sooner in the naïve population. Short-term toxification in the laboratory caused a significant shift in the genotypic composition of this population, determined with a molecular marker for sodium-channel resistance. Clams with the sensitive genotype were selectively eliminated relative to resistant or heterozygote clams. Ingestion of toxic cells (too large for larval capture) is thus required to elicit toxic effects. Exposure to mixed, toxic, and nontoxic algal suspensions demonstrated that adverse effects to fitness (survival and growth) were dose-dependent, occurring only at $ 50 cells mL 21 of the isolate used (PR18b). Paralysis and thus increased predatory risk occurred even at 10 cells mL 21 . Postlarvae , 12 mm, which can co-occur with red tides throughout the Atlantic range of M. arenaria, were more susceptible to PSP than large (. 30 mm) juveniles. Natural selection for resistance in Atlantic populations will thus vary latitudinally with the timing, duration, and intensity of toxic blooms.

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“…Because many clam flats in these counties border agricultural lands, roadsides and forests, much speculation has arisen concerning the effects of pesticide run-off on clam flat health (Van Beneden, 2005). Some studies point to lack of larvae arriving at eastern flats (Vassiliev et al, 2000; Congleton et al, 2006). Others note the prevalence of gonadal neoplasia in isolated populations of clams in eastern Maine (Gardner et al, 1991; Barber, 1996, 2004).…”

Section: Introductionmentioning

confidence: 99%

Impacts of stage-specific acute pesticide exposure on predicted population structure of the soft-shell clam, Mya arenaria

et al. 2010

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A combined laboratory and modeling approach was used to assess the impact of selected pesticides on early life stages of the soft-shell clam, Mya arenaria. Clams were exposed for 24 h as veligers or pediveligers to the broad-spectrum herbicide hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1h,3h)-dione; (Velpar®)], the phenoxyacetic acid herbicide, 2,4-D (2,4- dichlorophenoxyacetic acid; Agway® Super BK 32), or phosmet (Imidan®). In addition, juvenile clams were exposed for 24 h to 2,4-D and their growth monitored for 21 months. Laboratory experiments indicated veligers were more sensitive to acute pesticide exposure than pediveligers, with 2,4-D exposed veligers exhibiting the lowest survival among all treatments. Relative to controls, juvenile clams exposed to 0.5 ppm 2,4-D had enhanced survival following the initial 3 months of grow out. Juveniles exposed to 0.5 ppm, 5 ppm and 10 ppm 2,4-D showed an initial growth delay relative to control clams, but at 21 months post exposure these clams were significantly larger than control clams. Data from the larval and juvenile exposures were used to generate a stage-specific matrix model to predict the effect of pesticide exposure on clam populations. Impacts on simulated clam populations varied with the pesticide and stage exposed. For example, 2,4-D exposure of veligers and pediveligers significantly reduced predicted recruitment as well as population growth rate compared to controls, but juvenile exposure to 2,4-D did not significantly reduce population growth rate. With the exception of veligers exposed to 10 ppm, hexazinone exposure at the both veliger and pediveliger stages significantly reduced predicted recruitment success compared to 0 ppm controls. Hexazinone exposure also reduced modeled population growth rates, but these reductions were only slight in the pediveliger exposure simulations. Veliger and pediveliger exposure to phosmet reduced modeled population growth rate in a dose-dependent fashion. Changes in modeled population stable stage distributions were also observed when veligers were exposed to any pesticide. These results suggest that both the stage of exposure and the specific toxicant are important in predicting effects of pesticide exposure on soft-shell clam populations, with earlier life stages showing greater sensitivity to the pesticides tested.

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Trends in Maine Softshell Clam Landings

Cited by 14 publications

References 10 publications

Shifting perceptions of rapid temperature changes’ effects on marine fisheries, 1945–2017

Shifting perceptions of rapid temperature changes’ effects on marine fisheries, 1945–2017

Evidence of selection for resistance to paralytic shellfish toxins during the early life history of soft‐shell clam, Mya arenaria, populations

Impacts of stage-specific acute pesticide exposure on predicted population structure of the soft-shell clam, Mya arenaria

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