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FTSE 7, The over-all density of crustaceans per m2 was higher in April, July to September and again in November. The total number of crustacean captured monthly related with Seawater temperature in quadratic fashion. The organization of the assemblages all the round year was simple.
The diversity was low and the concentration of dominance was generally high. Diversity H' varied seasonally and maximum diversity was observed in December. Kirk has an academic background in Marine Biology, and his passion focuses on ocean and coastal conservation for future generations. Kirk can be reached at: kirk. As the Shoreline Restoration Project Coordinator, Emily works to raise awareness regarding the importance of shoreline habitat in the Indian River Lagoon.
She loves the coastal environment, spending her work time in the lagoon and free time in the ocean. Emily can be reached at: emily. In retirement she has become a Florida Master naturalist and leads interpretive hikes and kayak trips for the Sierra Club.
She has established her own natural area in her backyard where a dozen plants are blooming at any one time and she raises monarch butterflies. While not a beach goer in spite of living just a few miles away, the horseshoe crab project has put her on her closest beach plenty! She particularly enjoys the hands on learning about sea life while spending time with other nature-oriented volunteers.
Her real passion has always been wildlife conservation and animals. After many years in the healthcare field, she has decided to pursue her real passion and currently she is working towards becoming a wildlife rehabilitator and going back to school to obtain a master degree in environmental sciences.
Shelly Krueger, M. In , Shelly was a Dean John A. They attended a workshop in Cedar Key, and it was limulus love at first sight! Since then, they have helped take point on establishing the program in their home county of Pinellas. As a Florida native, professional captain, and student of environmental science, Ryan has spent his whole life around Florida wildlife and the ocean. He is thrilled to have the opportunity to be hands-on with the FHCW and to share his passion for biology.
Maddie is a longtime employee at Clearwater Marine Aquarium, where she shares her love of marine life and conservation with visitors and teammates alike.
An organizational nerd at heart, she also loves the administrative side of helping to coordinate the FHCW team. When they aren't tagging crabs, Maddie and Ryan enjoy reading, playing with their two dogs, and debating which fandom is better: Harry Potter or Star Trek. Madelyn: madelynhightower gmail. Ryan: aquaticexplorer86 gmail. Three squares 25 m 2 each were sampled in each transect. The collected data were used to estimate the abundance and density existing in the studied areas.
The number of individuals collected individuals m -2 was used to determine the abundance, while data on the number of inhabited burrows, empty burrows and capped burrows total burrows m -2 were used in the density calculation. The animal capture was performed manually by hands. After collection, the specimens were washed and packed in polyethylene bags for transport to appropriate location to perform the biometrics. Subsequently, the animals were stored ice coolers to induce them to a lethargic stage, thus facilitating the acquisition of biometric data sex, weight and carapace's linear measurements , as well as determining the gonadal maturation stage of females.
The evaluation criteria established by Mota Alves were used for determining the gonadal maturation of females. The maturation stages were not identified in males, since the analyses were carried out in the field and did not allow more accurate observation of the gonads. The sexual characterization of individuals was made macroscopically because the animals showed evident sexual dimorphism in the abdomen.
The statistical significance of sex ratio on stocks composition was calculated by using the Chi-square test x 2 for each month and the total period of data collection. The individual weight IW was determined on analytical balance 0. Linear measurements mm such as carapace length and width CL and CW were determined with steel caliper 0.
During weighing, the individuals without any of the claws were discarded. Crabs without some of the pereiopods had the weight of the pereiopod symmetrical to that one lost added to their total weight. The t test was used to compare biomass data, CL and CW between males and females at 0. Regression analysis by power function was used to check for the growth types through the b value Hartnoll The density total burrows m -2 was higher than abundance individuals m -2 in January, March, August and November Figure 2.
The highest values of individuals 0. The mean density and mean abundance in the dry season 1. According to the the Chi-square test for c 2 0. Mean values obtained from the linear measurements and weights showed that the collected animals had larger carapace width Thus, males had heavier weight, larger carapace length CL , width CW and higher height values CH than females, which clearly shows the dimorphometrics between sexes Table 1. Most females collected As for males, the highest frequency The low number of crabs in smaller size classes juveniles and small adults found in the mangroves is related to the difficulty of finding their burrows and due to the method for animal capture used by the collectors.
Most females were sexually mature in the late May and early August due to the higher percentage of females with dark brown and wine colored ovaries Figure 5. The populations of Ucides cordatus showed lower density values than those determined for some States from the North and Northeast regions of Brazil. This fact may be related to the environmental characteristics of the study areas, such as vegetation structure and composition Pedersen et al.
Mean densities of 6. In the Northeast, densities values were 5. Mean densities were higher than the abundance values in most months, suggesting that the same individual may be occupying more than one burrow for shelter. In addition, marks left by predators on the edge of the burrows indicate that some of these burrows may be empty due to predation, anthropogenic actions, or may have been caused by other animals such as raccoons Procyon sp.
Reproductive migration can also influence the abundance; however, this phenomenon was not observed in this study. According to Lara , mangroves in the Amazon coast are well preserved due to the lower anthropogenic pressure on this region.
However, with increasing habitat destruction and increased overexploitation of fishery stocks, those species with low population densities are more likely to be impacted.
In addition, mean density and mean abundance were higher in the dry season months than in those of wet season. One explanation for the significant reduction in the production of U. The climate influence on other population parameters, such as density, may also be corroborated by other studies. However, the total number of males collected exceeded the number of females.
The same pattern occurred in December, May and August. In the States where the capture of females is allowed, except for the closed season reproduction period , the greater capture of males may be related to their larger size.
The same situation occurred in Pernambuco with the predominance of females in the mangroves of Rio Formoso Estuary Botelho et al. In this work, the same situation was found in November, December and March, despite the statistical analyses showing a significant difference between the total frequency of males and females.
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