Evaluation of fishery-induced sperm limitation in Chesapeake Bay blue crab using an individual-based model

Rains, Sarah A. M.; Wilberg, Michael J.; Miller, Thomas J.

doi:10.3354/meps12595

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…Intense, size-focused fishing of males may alter the male size structure and sex ratio of local populations ( sensu Jivoff, 2003 [ 76 ]), especially for crustaceans species [ 99 ]. The second hypothesis is that harvesting mature females has the greatest impact on populations, and harvesting males is only effective if their numbers are such that females are unable to find a mate, as observed in North America [ 100 ]. These two hypothesis are to be explored in the near future.…”

Section: Discussionmentioning

confidence: 99%

Environmental drivers of size-based population structure, sexual maturity and fecundity: A study of the invasive blue crab Callinectes sapidus (Rathbun, 1896) in the Mediterranean Sea

Marchessaux,

Gjoni,

Sarà

2023

PLoS ONE

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The blue crab Callinectes sapidus (Rathbun, 1896) is one of the most invasive species in the Mediterranean Sea. Understand how the populations are maintained and how the environment is driving the populations in the areas invaded is the key to an effective future management. This current study is presenting a monthly long-term monitoring of the blue crabs’ population structure, body size, sexual maturity, reproduction periods and fecundity, and their relationships with environmental factors in a saltmarshes system in Italy. During winter, high densities (15 ± 8 ind m-2) of early juveniles (< 2 cm) were observed, and their numbers decreased due the population growth until summer. The size-spectra showed that across different temperature (18–26°C) and salinity (24–40 psu) gradients, the growth period for males is faster than for females. Based on abdominal analysis, sexual maturity was defined at ∼12 cm for males and females but the population was in favor of males that were more than 66% of the time mature throughout the year. Copulations periods were identified between spring and autumn when more than 50% of females were matures, and ovigerous females’ migrations were observed in late summer. Our study expand our understanding of how the environment interacts to effect physiological and biological processes of alien species and improve our ability to make predictions of how environmental change the distribution of the alien species in the future. Based on our results, we also discuss which population control strategy would be most effective based on the data available in the literature.

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Section: Discussionmentioning

confidence: 99%

Environmental drivers of size-based population structure, sexual maturity and fecundity: A study of the invasive blue crab Callinectes sapidus (Rathbun, 1896) in the Mediterranean Sea

Marchessaux,

Gjoni,

Sarà

2023

PLoS ONE

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“…But many of these models are individual‐based and require large amounts of detailed individual data and high computing capacity. Two‐sex individual‐based models have been used to study selective harvesting and sperm limitation in crustaceans (e.g., Rains, Wilberg, & Miller, ) and in sequential hermaphroditic vertebrates (i.e., species that change sex at a given size and/or sex ratio; Shapiro, ), mostly sex‐changing fish (e.g., Alonzo & Mangel, ; Robinson et al, ). Our model is adapted for gonochoristic species, as gonochorism is more common than hermaphroditism in not only temperate fish species (Warner, ), but also animals in general.…”

Section: Discussionmentioning

confidence: 99%

Effects of size‐ and sex‐selective harvesting: An integral projection model approach

Stubberud

Vindenes

Vøllestad

et al. 2019

Ecology and Evolution

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Harvesting is often size‐selective, and in species with sexual size dimorphism, it may also be sex‐selective. A powerful approach to investigate potential consequences of size‐ and/or sex‐selective harvesting is to simulate it in a demographic population model. We developed a population‐based integral projection model for a size‐ and sex‐structured species, the commonly exploited pike (Esox lucius). The model allows reproductive success to be proportional to body size and potentially limited by both sexes. We ran all harvest simulations with both lower size limits and slot limits, and to quantify the effects of selective harvesting, we calculated sex ratios and the long‐term population growth rate (λ). In addition, we quantified to what degree purely size‐selective harvesting was sex‐selective, and determined when λ shifted from being female to male limited under size‐ and sex‐selective harvesting. We found that purely size‐selective harvest can be sex‐selective, and that it depends on the harvest limits and the size distributions of the sexes. For the size‐ and sex‐selective harvest simulations, λ increased with harvest intensity up to a threshold as females limited reproduction. Beyond this threshold, males became the limiting sex, and λ decreased as more males were harvested. The peak in λ, and the corresponding sex ratio in harvest, varied with both the selectivity and the intensity of the harvest simulation. Our model represents a useful extension of size‐structured population models as it includes both sexes, relaxes the assumption of female dominance, and accounts for size‐dependent fecundity. The consequences of selective harvesting presented here are especially relevant for size‐ and sex‐structured exploited species, such as commercial fisheries. Thus, our model provides a useful contribution toward the development of more sustainable harvesting regimes.

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“…The decreased abundance and male size can result in sperm competition, which potentially reduced the female's reproductive output and success rate in crustaceans (Sato et al, 2007;Sato, 2011;Ogburn et al, 2014;Pardo et al, 2015;Pardo et al, 2017). At biased sex ratios or in species for which females preferentially mate with large males, females may have reduced reproductive success because they are unable to find suitable mates due to the prevalence of smaller males (Rowe and Hutchings, 2003;Rains et al, 2018).…”

Section: Reproductive Dynamics Changed Over the Yearsmentioning

confidence: 99%

Population structure and reproductive dynamics of the ridged swimming crab Charybdis natator in the southern Taiwan Strait of China: significant changes within 25 years

2023

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The ridged swimming crab Charybdis natator (Portunidae) is a commercially important crustacean species in China. The purpose of this study is to compare its population structure and reproductive pattern within the same fishing area (the southern Taiwan Strait) from two datasets over 25 years; one from 1994−1996 (the early years of the C. natator fishery) and the other from 2019. The overall sex ratio (male:female) changed from a male bias (1:0.76, p < 0.01) in 1994−1996 to a female bias (1:1.38, p < 0.01) in 2019. Male body sizes (carapace width, CW) were significantly larger than those of females in both datasets (p < 0.05). The average CW and body weight (BW) of males and females in 2019 were significantly smaller (p < 0.01) and lighter (p < 0.01) than those in 1994−1996. The maximum body size and the proportion of large-sized individuals (CW > 10 cm) decreased dramatically over 25 years. One spawning peak season was identified from each dataset, i.e., March−August 1994−1996 and February−April 2019, revealing a 1-month shift. The minimum body sizes for female maturation (carrying eggs) were 6.9 cm CW in 1994−1996 and 6.1 cm CW in 2019, an 11.6% reduction over 25 years. For the first time, the CW at 50% female maturation, the relationship between female absolute fecundity and CW, and egg diameters were obtained from the 2019 dataset, which can be applied in the future comparisons. Recent studies have revealed a consistent spawning peak in February–April for several commercially important crabs in the southern Taiwan Strait. These findings should be considered in crab fishery management. Furthermore, both fishery- and environment-associated factors influencing crustacean population structure and reproductive dynamics merit further investigation.

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Evaluation of fishery-induced sperm limitation in Chesapeake Bay blue crab using an individual-based model

Cited by 10 publications

References 25 publications

Environmental drivers of size-based population structure, sexual maturity and fecundity: A study of the invasive blue crab Callinectes sapidus (Rathbun, 1896) in the Mediterranean Sea

Environmental drivers of size-based population structure, sexual maturity and fecundity: A study of the invasive blue crab Callinectes sapidus (Rathbun, 1896) in the Mediterranean Sea

Effects of size‐ and sex‐selective harvesting: An integral projection model approach

Population structure and reproductive dynamics of the ridged swimming crab Charybdis natator in the southern Taiwan Strait of China: significant changes within 25 years

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