Metapopulation dynamics of the softshell clam, Mya arenaria

Strasser, Carly

doi:10.1575/1912/2323

Cited by 2 publications

(1 citation statement)

References 115 publications

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“…Since no relationship was observed between the factors analyzed and the mortality event, it is necessary to analyze other parameters, such as the presence of organic and inorganic contaminants, pathologies and water temperature. In this sense, parasitism may be one of the biotic factors responsible for the dynamics of bivalve metapopulations in general, since repopulation, larval dispersal and the recruitment dynamics in bivalves allude directly to the concept of metapopulations (Strasser 2008).…”

Section: Lowest Day Tidesmentioning

confidence: 99%

Mortality of the Clam Anomalocardia brasiliana Population in the Pirajubaé Marine Extractive Reserve: Effect of Climate Events?

Vaquero¹,

Sühnel²,

Ferreira

2022

Anu. Inst. Geociênc.

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In February 2015, an event of massive mortality of the clam Anomalocardia brasiliana was reported in the Pirajubaé Marine Extractive Reserve (RESEX), located in Florianópolis, SC. To investigate whether the cause of the event was related to climate and/or environmental factors, daily data of air temperature, precipitation, global solar radiation and lowest day tide from different databases of a 4-month interval (November, December, January, and February) from 2010 (beginning in November of 2010) to 2017 were collected. Based on the analyzed parameters, no changes that could be related to the occurrence of massive mortality of clams in February 2015 were observed. This analysis also indicates that there is no relation between the studied parameters and the absence of recovery of the natural stock of these organisms.

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Section: Lowest Day Tidesmentioning

confidence: 99%

Mortality of the Clam Anomalocardia brasiliana Population in the Pirajubaé Marine Extractive Reserve: Effect of Climate Events?

Vaquero¹,

Sühnel²,

Ferreira

2022

Anu. Inst. Geociênc.

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The Impact of the Second Seasonal Spawn on the Nantucket Population of the Northern Bay Scallop

2015

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Nantucket, Massachusetts, has one of the last remaining commercial fisheries of the bay scallop Argopecten irradians, which is based largely on natural recruitment. Though previously thought to spawn only once in early summer at age 1, individuals of the northern subspecies often spawn again in late summer or fall, and recruits from this second spawning can survive to reproduce again in their second summer. We formulated an age‐based Leslie matrix model and estimated population growth rate with and without a second spawn based on data from 5 years of life history research. Elasticity analysis revealed that the population growth rate was most sensitive to juvenile survival, the major factor in recruitment rate, and year‐1 adult fertility was a close second. We varied those two rates randomly in a stochastic matrix model, which represented the effect of environmental fluctuations on population growth. A life history modeled with a second spawn had a negligible effect on the deterministic population growth rate under constant conditions, but under variable conditions the second spawn increased the mean of the stochastic growth rates up to 58.3% over that of a single early‐spawning life history. These results suggest that the second spawn is a successful bet‐hedging strategy. The northern bay scallop increases its chances for successful recruitment in a variable environment by spreading reproductive effort over more than one period in a season. This strategy appears to have sustained the Nantucket scallop population in spite of severe annual fluctuations and the eventual collapse seen in other locations. Received March 6, 2015; accepted June 19, 2015

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Metapopulation dynamics of the softshell clam, Mya arenaria

Cited by 2 publications

References 115 publications

Mortality of the Clam Anomalocardia brasiliana Population in the Pirajubaé Marine Extractive Reserve: Effect of Climate Events?

Mortality of the Clam Anomalocardia brasiliana Population in the Pirajubaé Marine Extractive Reserve: Effect of Climate Events?

The Impact of the Second Seasonal Spawn on the Nantucket Population of the Northern Bay Scallop

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