Naturalization of the Manila clam (<i>Tapes philippinarum</i>), an alien species, and establishment of a clam fishery within Poole Harbour, Dorset

Jensen, A.C.; Humphreys, John; Caldow, R. W. G.; Grisley, C.; Dyrynda, P. E. J.

doi:10.1017/s0025315404010446h

Cited by 64 publications

(41 citation statements)

References 5 publications

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“…Natural populations of this species are distributed along the coast of the Pacific and Atlantic Oceans, as well as the coastlines of the Adriatic and Aegean Seas (Jensen et al 2004), and along the coast of the Mediterranean and Marmara Seas (Albayrak 2005). Along the southern coast of the Marmara Sea, R. philippinarum is one of the most abundant bivalve species at depths between 1 and 10 m, and it is only collected by scuba diving.…”

Section: Introductionmentioning

confidence: 99%

Some population parameters of Ruditapes philippinarum (Bivalvia, Veneridae) on the southern coast of the Marmara Sea, Turkey

Çolakoğlu

Palaz

2014

Helgol Mar Res

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Ruditapes philippinarum, a venerid clam, is a dominant species in the sandy and muddy areas in the coastal waters of the Marmara Sea. Intensive commercial harvesting of this species is conducted in these regions. We studied the population dynamics of R. philippinarum on the southern coast of the Marmara Sea (Bandırma). Samples were collected on a monthly basis between September 2012 and August 2013. Seasonal von Bertalanffy growth parameters using the length-frequency distribution of R. philippinarum were estimated at L ? = 67.50 mm and K = 0.33 year -1 , and the seasonal oscillation in growth rate was 0.53. The slowest growth period was in January. The growth performance index and potential lifespan were 3.182 and 8.06 years, respectively. The growth relationship was confirmed to have a positive allometric pattern. The average total mortality rate was estimated to be 0.777 year -1 , whereas the natural and fishing mortality rates were 0.539 and 0.238 year -1 , respectively. The current exploitation rate of R. philippinarum was 0.306. The recruitment pattern peaked during June-August, and spawning occurred between May and August. The results of this study provide valuable information on the status of R. philippinarum stocks.

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Section: Introductionmentioning

confidence: 99%

Some population parameters of Ruditapes philippinarum (Bivalvia, Veneridae) on the southern coast of the Marmara Sea, Turkey

Çolakoğlu

Palaz

2014

Helgol Mar Res

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“…In Europe, this species was first introduced in France between 1972 and1975 for aquaculture purposes and later in England, Spain and Italy (Flassch and Leborgne, 1992). In the late 1980s, natural population have developed in Italy , in England (Jensen et al, 2004;Humphreys et al, 2007) and in most embayments along the French Atlantic coast, resulting in a fishery of ca. 1500 tons in the Gulf of Morbihan at the end of the 1990s.…”

Section: Introductionmentioning

confidence: 99%

Variability of the hemocyte parameters of Ruditapes philippinarum in the field during an annual cycle

Flye-Sainte-Marie

Soudant

Lambert

et al. 2009

Journal of Experimental Marine Biology and Ecology

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A field monitoring of hemocyte parameters of the Manila clam Ruditapes philippinarum was conducted from July 2004 to September 2005 in Gulf of Morbihan (France), in order to assess (1) the factors controlling the hemocyte parameters of the Manila clam and (2) their relative contribution to the overall variability of these parameters. Monthly, sixty clams were sampled and Total Hemocyte Count (THC), granulocyte and hyalinocyte counts, phagocytosis, phenoloxidase specific activity, length, flesh dry weight, and condition index were measured individually. Perkinsus sp. infection and Brown Ring Disease symptoms were also monitored.Temperature and trophic resource were also monitored.Results indicate that temperature controls granulocyte counts and subsequently THC. Other environmental factors had no direct influence on the measured hemocyte parameters. Almost all measured parameters were significantly affected by size/age and condition index. There were poor relationships between both pathologies and hemocyte parameters presumably because of low infection intensities. Nevertheless, high Perkinsus sp. infection intensity significantly increased total and granulocyte counts and decreased phagocytosis.An interesting result of this study is that the measured biotic and abiotic factors poorly contribute to the explanation of the total variability of hemocyte parameters. Granulocyte concentration was the best explained parameter. However, only 16.4% of its variance was explained by cumulating temperature, length, condition index and Perkinsus sp. infection effects. This study emphasizes the need for a better understanding of hemocyte functions and the factors modulating these functions.

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“…The optimum water temperature for growth is between 20 and 258C and spawning occurs when water temperatures are between 18 and 268C (Solidoro et al 2003). The naturalization of Manila clams in Poole Harbour, as in the lagoons of the Adriatic Sea, reflects the presence of relatively warm eutrophic waters ( Jensen et al 2004). Manila clams spawn more frequently and over longer periods in the southern part of their native range and within Europe (Laruelle et al 1994).…”

Section: Discussionmentioning

confidence: 99%

“…The cumulative frequency distributions of the sizes of clams consumed by oystercatchers and those available in the mud differed significantly ( Kolmogorov-Smirnov test DZ0.241, nZ859, 77; p!0.001), primarily because the birds ignored clams smaller than 15 mm (figure 2). The average intake rate achieved by oystercatchers that specialized in the three principal diets did not differ significantly (ANOVA F ( Jensen et al 2004), has reduced the over-winter mortality of the existing wintering population of oystercatchers (from 4.6% to 1.1%) and altered the shape of the density-dependent mortality function (figure 4). The model predicts that if the average clam abundance across Poole Harbour was to increase, the density dependence of the over-winter mortality of oystercatchers would gradually diminish in strength.…”

Section: (D) Modellingmentioning

confidence: 97%

Benefits to shorebirds from invasion of a non-native shellfish

et al. 2007

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Introductions of non-native species are seen as major threats to ecosystem function and biodiversity. However, invasions of aquatic habitats by non-native species are known to benefit generalist consumers that exhibit dietary switches and prey upon the exotic species in addition to or in preference to native ones. There is, however, little knowledge concerning the population-level implications of such dietary changes. Here, we show that the introduction of the Manila clam Tapes philippinarum into European coastal waters has presented the Eurasian oystercatcher Haematopus ostralegus ostralegus with a new food resource and resulted in a previously unknown predator-prey interaction between these species. We demonstrate, with an individuals-based simulation model, that the presence of this non-native shellfish, even at the current low density, has reduced the predicted over-winter mortality of oystercatchers at one recently invaded site. Further increases in clam population density are predicted to have even more pronounced effects on the density dependence of oystercatcher over-winter mortality. These results suggest that if the Manila clam were to spread around European coastal waters, a process which is likely to be facilitated by global warming, this could have considerable benefits for many shellfish-eating shorebird populations.

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Naturalization of the Manila clam (Tapes philippinarum), an alien species, and establishment of a clam fishery within Poole Harbour, Dorset

Cited by 64 publications

References 5 publications

Some population parameters of Ruditapes philippinarum (Bivalvia, Veneridae) on the southern coast of the Marmara Sea, Turkey

Some population parameters of Ruditapes philippinarum (Bivalvia, Veneridae) on the southern coast of the Marmara Sea, Turkey

Variability of the hemocyte parameters of Ruditapes philippinarum in the field during an annual cycle

Benefits to shorebirds from invasion of a non-native shellfish

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