Palm Beach County Research Articles

Three New Hepatozoon Species (Apicomplexa: Hepatozoidae) Infecting the Florida Kingsnake, Lampropeltis getula floridana

The Florida kingsnake, Lampropeltis getula floridana, is host to 3 species of Hepatozoon at the type locality, Miramar, Broward County, Florida, and 2, possibly all 3, species at Cedar Key, Levy County, approximately 480 km to the northwest. Hepatozoon eurytopis, n. sp. was present also in Diadophis punctatus and Elaphe guttata in Jupiter Farms, Palm Beach County, and in Thamnophis sirtalis at Gainesville, Alachua County. Specific identity in D. punctatus was determined from gamont morphology and from sporogonic stages and gamont morphology in the infections obtained from E. guttata and T. sirtalis. Infection with all 3 species by ingestion of infected mosquitoes was easily obtained in E. guttata, but only H. eurytopis produced experimental infection in T. sirtalis and Storeria occipitomaculata. Hepatozoon eurytopis differed from the other 2 species, H. karyolysi n. sp. and H. rexi n. sp., by its short and broad, recurved gamonts with average dimensions 11.2-13.1 x 4.5-5.4 microm, length x maximum width (LW) 56-64 microm(2), and L/W ratios 2.13-2.80 in all host species, large round oocysts 95-303 x 91-285 microm, L/W ratios 1.03-1.05 with spherical to ovoid sporocysts 22-50 x 21-44 microm, L/W ratios 1.00-1.82 that contain 33.5-44.4 (16-76) sporozoites. The nucleus in immature gamonts is highly irregular, often fragmented in separate masses of chromatin, and commonly appears to form binucleate gamonts before maturity. Hepatozoon karyolysi has elongate, non-recurved gamonts, 15-20 x 4-7 microm, LW 64-143 microm(2), L/W ratios 2.3-4.5 that usually cause lysis or irregular margins of the nucleus in infected erythrocytes of the type host. Oocysts are spherical, 127-243 x 122-233 microm, L/W ratio 1.0-1.1 that contain spherical to usually ovoid sporocysts 17-30 x 17-24 microm, and produce 12-20 sporozoites. Gamonts of Hepatozoon rexi are non-recurved, 14-18 x 4-6 microm, LW 67-102 microm(2), and L/W ratio 2.8-4.1, and are usually surrounded by a prominent cyst wall within the host erythrocyte. Oocysts are nearly spherical, 103-178 x 103-172 microm, form usually elongate sporocysts, 30-39 x 20-25 microm L/W ratio 1.33-1.94 that contain 16-36 sporozoites. An oocyst of H. eurytopis was present in the salivary gland of an infected Aedes aegypti , which is the second report of sporogony by a Hepatozoon species occurring in this site.

Water budget model for a remnant northern Everglades wetland

The Arthur R. Marshall Loxahatchee National Wildlife Refuge overlays Water Conservation Area 1, a 580 km2 freshwater wetland remnant of the northern Everglades in Palm Beach County, Florida, USA. Changes in water quantity and quality have impacted the Refuge ecosystem. Ensuring appropriate management to maximize benefits for wildlife while meeting flood control and water supply needs is a refuge priority. The Simple Refuge Stage Model described herein supports these management decisions. The two-compartment model with a daily time step predicts temporal variations of water level in the refuge rim canal and interior marsh, based on observed inflows, outflows, precipitation and evapotranspiration. The model was used to evaluate various water management scenarios. The modelling approach applied herein may have utility in managing other wetland systems where over-bank flooding is a dominant mechanism, affecting hydrology and water quality.

Abused Latina Women's Perceptions of Their Postdivorce Adjustment

This qualitative study explores the postdivorce adjustment of battered Latina immigrants. Three focus groups were conducted. Data were analyzed utilizing a grounded theory approach. Five conceptual themes were unearthed including: (a) intimate partner violence (IPV) as the precipitator for divorce; (b) motivations for leaving; (c) the impact of the Latino culture on marriage, separation, and postdivorce; (d) immigration and other legal and social issues; and (e) postdivorce/post-IPV experiences. Implications for practice are drawn. The authors wish to thank the Palm Beach County State Attorney's Office and the SafetyNet Program in Florida for their permission to conduct this study. Special thanks to Ms. Marlene Rivera for her assistance in recruiting the participants. This study could not have been done without the women who participated in the focus groups. The authors would like to thank them all. This study was supported by a grant from the Shifting Foundation.

Production Budget for Bell Peppers in Palm Beach County, Florida

FE809, a 4-page fact sheet by John VanSickle, Scott Smith, and Eugene McAvoy, provides an overview of bell pepper production practices for Palm Beach County producers, including a per-acre composite budget breaking down the specific cost components. Includes references. Published by the UF Department of Food and Resource Economics, December 2009.

Estimates of the Replacement Costs of Commercial and Backyard Avocado Trees in South Florida

FE825, a 4-page article by Edward A. Evans and Jonathan H. Crane, estimates how much it would cost to replace all commercial and residential backyard avocado trees in Miami-Dade, Broward, Palm Beach, and Lee Counties, in light of the recent discovery of the redbay-laurel wilt disease complex, which can destroy both commercial and backyard avocado trees. Includes references. Published by the UF Department of Food and Resource Economics, December 2009. FE825/FE825: Estimates of the Replacement Costs of Commercial and Backyard Avocado Trees in South Florida (ufl.edu)

Invasive leaf resources alleviate density dependence in the invasive mosquito, Aedes albopictus

Interactions between invasive species can have important consequences for the speed and impact of biological invasions. Containers occupied by the invasive mosquito, Aedes albopictus Skuse, may be sensitive to invasive plants whose leaves fall into this larval habitat. To examine the potential for interactions between invasive leaf species and larval A. albopictus, we conducted a field survey of leaf material found with A. albopictus in containers in Palm Beach County, Florida and measured density dependent responses of A. albopictus larvae to two invasive and one native leaf species in laboratory experiments. We found increased diversity of leaf species, particularly invasive species, in areas further from the urbanized coast, and a significant positive association between the presence of Schinus terebinthifolious (Brazilian pepper) and the abundance of A. albopictus. In laboratory experiments, we determined that larval growth and survivorship were significantly affected by both larval density and leaf species which, in turn, resulted in higher population performance on the most abundant invasive species (Brazilian pepper) relative to the most abundant native species, Quercus virginiana (live oak). These results suggest invasive leaf species can alleviate density dependent reductions in population performance in A. albopictus, and may contribute to its invasion success and potential to spread infectious disease.

Knowledge, Attitudes, and Behaviors of Elementary School Students Regarding Sun Exposure and Skin Cancer

The aim of this study was to assess baseline knowledge of skin cancer, sun protection practices, and perceptions of tanning among third through fifth grade elementary students in Florida. A total of 4,002 students in nineteen elementary schools in Palm Beach County, Florida were surveyed. SunSmart America curriculum pretest responses were the main outcome measures. Overall students' knowledge using a students' mean knowledge scale scores of skin cancer and sun protection were low (<40% of questions answered correctly) and was found to increase with increasing grade level (p < 0.01). Boys more frequently reported spending greater than 2 hours in the sun when compared with girls (p < 0.01). Girls, however, were more likely to try and get a tan most of the time or always when compared with boys (p = 0.02). Non-Hispanic White students (51.3%) more frequently reported use of SPF 15 or greater sunscreen "most of the time or always" compared with Hispanic (35.3%) and non-Hispanic Black (13.4%) students (p < 0.01). Elementary aged students in south Florida have limited knowledge about sun safety, despite spending considerable amount of time in the sun. Sun safe behavior is associated with gender and ethnicity. The findings provide empirical support for the need of a school-based educational intervention.

Mayan Cognition, Memory and Trauma

The argument of this article is organized around the following general themes: understanding representational “exaggeration” for signifying indigenous others; assessing the differences for the social agency of recollection, especially in relation to lawyer‐oriented depositions and researcher‐oriented interviews; analysing the cognitive aspects of surviving the Guatemalan genocide and examining the cognition of discrimination among Mayan‐immigrants in South Florida. Empirical data for this essay is based upon oral histories of three Mayan‐immigrants currently living in Palm Beach County, Florida, and archival data from legal depositions in the 1980s and 1990s of five Mayan‐immigrants in Martin County, Florida. Important aspects of this paper analyse the historical consequences of the Guatemalan Civil War during the 1980s and the role of social memory, episodic trauma, semantic trauma and the ontological effects of violence. In addition, notions of differing forms of time in relation to trauma are introduced as “synchronic trauma” and “diachronic trauma”.

Supporting low-income families with young children: Patterns and correlates of service use

Comprehensive, integrated service systems are increasingly viewed as a promising strategy for supporting healthy family functioning and child development in low-income families, but have shown variable impacts. This paper reports early findings from a longitudinal study of voluntary service use by a sample of low-income families with young children. Mothers ( N = 531) recruited soon after their newborns' birth in 2004 and 2005 from targeted communities in Palm Beach County, Florida are being followed for 8 years to assess service needs, service use, family functioning, and child well-being. A cluster analysis of services used in the second year revealed four distinct patterns of service use: a low-service group receiving mainly health care and food assistance, two moderate-service groups, and a high, multi-service group. These patterns were associated with families' demographic characteristics, nativity, health status, social support, year 1 maternal functioning, and previous service experiences. However, there were no significant differences between the service pattern groups with respect to year 2 maternal depression and parenting practices.

Shifts in Western Flower Thrips,Frankliniella occidentalis(Thysanoptera: Thripidae), Population Abundance and Crop Damage

Since the first report of Florida establishment in 1982, the western flower thrips (WFT), Frankliniella occidentalis (Pergande), has caused economic damage to vegetable crops, notably peppers, Capsicum annuum L. A survey of thrips infesting peppers in Palm Beach County, FL in 2006–07 showed that WFT populations were more prevalent than in a survey conducted in 1995–96, and exceeded economic thresholds for much of the growing season. The possible contribution of pyrethroid insecticide use to damaging populations of WFT is discussed.

First Report of Downy Mildew Caused by a Peronospora sp. on Basil in Florida and the United States

Basil is grown as a specialty crop in greenhouse and field production in Florida and other regions of the United States. Downy mildew on basil (Ocimum basilicum) was detected from four production sites (Collier, Hendry, Miami-Dade, and Palm Beach counties) in south Florida in the fall of 2007, and within months, it was also found in west-central north Florida (Hillsborough County). Incidence reached nearly 100% on some of the affected crops and caused complete yield losses on basil grown both in the field for fresh market and potted herbs market. Symptoms developed during transit on basil that appeared symptomless at harvest. Symptoms initially appeared as yellowing on the lower leaves that was typically delineated by the veins, although in some cases the entire leaf area of the leaf surface was affected. A gray, fuzzy growth was apparent on the abaxial leaf surface. Microscopic observation detected dichotomous branching, hyaline sporangiophores (220 to 750 × 4 to 9 μm) bearing single sporangia. Sporangia were light brown, ovoid to slightly ellipsoid, and measured 14 to 15 × 15 to 18 μm. Oospores were not observed. Leaves of potted basil plants and coleus (Solenostemon scutellarioides) were inoculated with a suspension containing 1 × 105 sporangia/ml and sprayed till runoff (approximately 15 ml per plant) with a hand-held pressurized aerosol canister. Plants were covered with a plastic bag for 24 h and maintained in the greenhouse under ambient conditions. Noninoculated plants served as controls. After 7 days, symptoms typical of downy mildew occurred only on the inoculated basil plants and sporulation was confirmed microscopically. The internal transcribed spacer regions of an isolate collected in Hendry County were sequenced bidirectionally. The consensus sequence was deposited into GenBank (Accession No. FJ346561). Sequence data matched (100% homology) with a Peronospora sp. reported on sweet basil in Switzerland (GenBank Accession No. AY884605) and was similar (99% homology) to an isolate (GenBank Accession No. DQ523586) reported on coleus, although inoculation to coleus failed to confirm pathogenicity on this host. The sequence data also distinguished the isolate from P. lamii (87% homology) previously reported to occur on basil. The pathogen was identified as a Peronospora sp. based on morphological characteristics and sequencing homology (1-3).

ROTATORY COLONIES OF THE CORALSSIDERASTREA RADIANSANDSOLENASTRAEASSP. (CNIDARIA, SCLERACTINIA), FROM THE PLEISTOCENE BERMONT FORMATION, SOUTH FLORIDA, USA

Abstract: Study of corallum shape inSiderastreaandSolenastraeacolonies collected from Pleistocene Bermont strata in western Palm Beach County, Florida, indicates that the corals are rotatory, formed by rolling during growth on the Pleistocene sea floor. Growth of a radial and centrifugal nature away from the corallum centre suggests that rolling was sufficiently frequent and energetic to maintain the health of individual polyps along the skeleton’s entire spherical surface with no evidence of growth stoppage. Post‐mortem sponge boring accompanied by that of sipunculid worms and boring by the bivalvesGastrochaenaandLithophagaduring coral colony life is common. Colonization by cirripeds (barnacles) on some live colonies also occurred, but these are most commonly overgrown. Boring of rotatory coralla decreased the mass of the skeleton and probably increased the ease and frequency of rolling. Comparison with modern rotatory specimens ofS. radiansfrom Rodriguez Bank indicates that the Pleistocene corals were not greatly modified during diagenesis, given their comparable densities. Diameters of both groups of corals are utilised to calculate levels of shear velocities necessary to move them, based on hydrodynamics of rounded sediment of comparable size. The presence of these rotatory coralla, by analogy, strongly suggest that Bermont sediments in the study area accumulated on shallow shelf areas populated by numerous other free‐living corals along with fewer fixed corals, accompanying a diverse molluscan assemblage, all indicative of aThalassia(turtle‐grass) community. Nearshore, wave data recorded along Florida’s present‐day east coast, in contrast to conditions along the west coast, indicate that sufficient wave‐generated velocities are present to cause regular rotation ofSiderastreaandSolenastraea, and would likely have done so during the Pleistocene.

Geomorphological Mapping along the Upper Southeast Florida Atlantic Continental Platform; I: Mapping Units, Symbolization and Geographic Information System Presentation of Interpreted Seafloor Topography

Abstract Continental shelf environments along the Florida Atlantic southeast coast offshore Palm Beach County were mapped by interpreting seafloor topography derived from airborne laser bathymetry. The study area covered approximately 270 km2 along 75 km of coast, extending from the shore to about 55 m water depth beyond the shelf break to the upper Florida-Hatteras Slope. Forty-two mapping units were used to depict seafloor features that ranged from bedrock outcrops and coral reefs to different types of morphosedimentary bodies. Background theory and protocols of geomorphological symbolization are provided as a rationale for the seafloor mapping. Geomorphological mapping symbols were developed specifically for this project and collected in a symbol library as part of an ArcInfo GIS extension that was used to produce the maps in a GIS environment. Spatial distribution patterns of landform assemblages evident in the color-pattern mapping units permitted regionalization of shelf environments into three prim...

Seacoast Banking Corp. of Florida

AbstractCommercial Banking (MIC: SIC: 6022 NAIC: 522110)Seacoast Banking is a bank holding company. Through First National Bank and Trust Company of the Treasure Coast (the Bank) and its broker‐dealer subsidiary, Co. provides a range of deposit accounts and retail banking services, engages in consumer and commercial lending and provides a variety of trust and asset management services, as well as securities and annuity products. The Bank's service area includes Palm Beach, Broward, Martin, St. Lucie, Brevard and Indian River counties, which are located on Florida's southeast coast. The Bank operates 43 banking offices in 14 counties. As of Dec 31 2007, Co. had total assets of $2.42 billion and total deposits of $1.99 billion.

The Irreplaceable Cannot Be Replaced

The Irreplaceable Cannot Be Replaced Ellen Harvey The Irreplaceable Cannot Be Replaced, Ellen Harvey, 2008. Photographs: Jan Baracz. People in New Orleans were invited to submit images or descriptions of irreplaceable places, people, or things lost to Hurricane Katrina. Eleven submissions were chosen at random and the artist painted 16” x 20” oil paintings based on those submissions. All thirty texts that were submitted were framed and exhibited along with the paintings at the Contemporary Arts Center/New Orleans as part of the exhibition Something from Nothing, curated by Dan Cameron. Texts without a painting were accompanied by a framed black panel. At the end of the exhibition, all of the paintings and the framed texts were given away to the participants. Ellen Harvey was born in the United Kingdom and lives and works in Brooklyn, NY. She has exhibited extensively in the US and internationally and was most recently included in the 2008 Whitney Biennial. Recent solo exhibitions include Private Collections at Locks Gallery, Philadelphia, The Museum of Failure at Luxe Gallery, New York, Beautiful/Ugly at Magnus Müller in Berlin, Bad Mirror at Galerie Gebruder Lehmann in Dresden, Mirror at the Pennsylvania Academy, and A Whitney for the Whitney at Philip Morris at the Whitney Museum at Altria. She took part in the Whitney Independent Study Program and the PS1 Studio Program. Recent awards include a Pennies from Heaven Grant, a Philadelphia Exhibitions Initiative Grant, a Rema Hort Mann Foundation Grant, a Palm Beach County Cultural Council Grant, and a New York Foundation for the Arts Fellowship. She has completed projects for both the New York and Chicago Transit Authorities, most recently including a mosaic for the new Metro-North Yankee Stadium Station. The New York Beautification Project was published by Gregory Miller in 2005, and Ellen Harvey: Mirror was published by the Pennsylvania Academy in 2006. Click for larger view View full resolution I am 87 years old living in a trailer on our property in New Orleans. We had 5 ft of water, which remained in the house 6 weeks creating mold to the ceiling. We lost everything. When I read Chris Rose’s column (he’s my favorite columnist in the whole world) it brought to mind my mother’s two dining room chairs that had been around as long as I can remember. I had them restored in about 1976 by Senior Citizens in classes of the “Peoples Program” sponsored by the nuns on Mirabean Ave. The wood was polished and varnished with a light brown stain and the seats were re-caned. I was born in 1920 so the chairs could be 75 years old. Anyway I can imagine you will have many interesting subjects to choose from but I’m submitting mine hoping I’ll be one of the very fortunate ones selected. I am terrible at drawing but will give you as complete a description as I can. I loved those chairs and enjoyed them for extra seating on holidays and at parties and they were conversation pieces. Alice Delaney [End Page 2] Click for larger view View full resolution There are so many “washed away” treasures, that the memorialization of even just one will be everlastingly meaningful to the community. I am submitting photographs of porcelain dolls, which I had crafted prior to the disaster. The dolls shown were created from commercial molds and were ready to go to a “new home.” Needless to say these dolls were submerged under water for at least two weeks. I call them my “children of the flood” but have not had the courage to disassemble them. I was able to rescue some doll parts and am in the process of cleaning, sorting and sanitizing them for future assembly. If I am ever able to get back to my very rewarding hobby, which was helpful in supplementing my retirement income, I will have to replace my electronic kiln and most of my doll making supplies. Many of the molds that were destroyed are no longer available. However, I will keep the memories dear, I have been fortunate enough to replace my sewing machines and some of the fabric used for clothing and doll...

Aquatic risk assessment of copper in freshwater and saltwater ecosystems of South Florida

A screening-level aquatic risk assessment was conducted for copper in south Florida's freshwater and saltwater environments. Risk was quantified by comparing the overlap between the probability distributions of copper exposure from surface water and sediment with the probability distributions of effects data obtained from laboratory studies. Copper concentrations in surface water and sediment in south Florida were summarized by county. For surface water, the highest concentrations of copper were found in Martin and St. Lucie counties for freshwater and saltwater, respectively. From the exposure probability distributions, the 90th centile values were estimated at 14.0 microg/L and 15.4 microg/L in freshwater and saltwater, respectively. Copper concentrations in sediment were evaluated from a probability distribution of predicted pore water concentrations. The 90th centile values of pore water concentrations from freshwater sediments ranged from 5.0 microg/L in Palm Beach County to 71.7 microg/L in Broward County. In saltwater sediments, the 90th centile values for pore water ranged from 26.1 microg/L in St. Lucie County to 27.3 microg/L in Miami-Dade County. Ecological effects data were obtained for acute and chronic copper effects in freshwater and saltwater. The 10th centile values for acute effects data were 21.2 microg/L and 9.8 microg/L for freshwater and saltwater species, respectively. For chronic effects, the 10th centile values were 3.8 microg/L and 3.9 microg/L for freshwater and saltwater species, respectively. The risk of acute copper exposure in surface water was generally low; however, the potential for ecological risk from chronic copper exposure was low to high in several counties including Lee, Martin, and St. Lucie counties. The risk of acute copper exposure in porewater from freshwater sediments also was low with the exception of St. Lucie and Broward counties. However, porewater from saltwater sediments posed a significant acute risk in Miami-Dade and St. Lucie counties. In porewater from freshwater and saltwater sediments chronic risk was high in counties with sufficient data available to calculate risk estimates.

Seacoast Banking Corp. of Florida

AbstractCommercial Banking (MIC: SIC: 6022 NAIC: 522110)Seacoast Banking is a bank holding company. Through First National Bank and Trust Company of the Treasure Coast (the Bank) and its broker‐dealer subsidiary, Co. provides a range of deposit accounts and retail banking services, engages in consumer and commercial lending and provides a variety of trust and asset management services, as well as securities and annuity products. The Bank's service area includes Palm Beach, Broward, Martin, St. Lucie, Brevard and Indian River counties, which are located on Florida's southeast coast. The Bank operates 43 banking offices in 14 counties. As of Dec 31 2007, Co. had total assets of $2.42 billion and total deposits of $1.99 billion.

Aboveground Biomass of an Invasive Tree Melaleuca (Melaleuca quinquenervia) before and after Herbivory by Adventive and Introduced Natural Enemies: A Temporal Case Study in Florida

Invasive plants can respond to injury from natural enemies by altering the quantity and distribution of biomass among woody materials, foliage, fruits, and seeds. Melaleuca, an Australian tree that has naturalized in south Florida, has been reunited with two natural enemies: a weevil introduced during 1997 and a psyllid introduced during 2002. We hypothesized that herbivory from these and other adventive organisms (lobate-lac scale and a leaf-rust fungus) would alter the distribution and allocation of biomass on melaleuca trees. This hypothesis was tested by temporally assessing changes in aboveground biomass components in conjunction with the presence of natural enemies and their damage to melaleuca trees. Melaleuca trees of different diameters representing the range (1 to 33 cm diam at 1.3 m height) within study sites were harvested during 1996, prior to the introduction of herbivorous insects, and again during 2003 after extensive tree damage had become apparent. Aboveground biomass, partitioned into several components (woody structures, foliage, fruits, and seeds), was quantified both times in Broward, Miami–Dade, and Palm Beach county sites located in south Florida. The two harvests within each site were performed in closely-matched melaleuca stands, and changes in biomass components were compared between years. Total biomass and woody portions decreased in Broward, whereas they increased in Miami–Dade and Palm Beach sites. Reductions in foliage (on all trees) and seed biomass (among seed-bearing trees) were greatest at Broward and least at Miami–Dade County site. Hence, overall seed and foliage production was severely reduced at the Broward site where both the natural enemy incidence and damage were more abundant compared to other sites. We therefore attribute the reduced foliar biomass and reproductive capability of melaleuca trees to infestations of natural enemies. These findings highlight the role that natural enemies can play in the long-term management of invasive tree species.

Real-time forensic DNA analysis at a crime scene using a portable microchip analyzer

An integrated lab-on-a-chip system has been developed and successfully utilized for real-time forensic short tandem repeat (STR) analysis. The microdevice comprises a 160-nL polymerase chain reaction reactor with an on-chip heater and a temperature sensor for thermal cycling, microvalves for fluidic manipulation, a co-injector for sizing standard injection, and a 7-cm-long separation channel for capillary electrophoretic analysis. A 9-plex autosomal STR typing system consisting of amelogenin and eight combined DNA index system (CODIS) core STR loci has been constructed and optimized for this real-time human identification study. Reproducible STR profiles of control DNA samples are obtained in 2 h and 30 min with ≤0.8 bp allele typing accuracy. The minimal amount of DNA required for a complete DNA profile is 100 copies. To critically evaluate the capabilities of our portable microsystem as well as its compatibility with crime scene investigation processes, real-time STR analyses were carried out at a mock crime scene prepared by the Palm Beach County Sheriff's Office (PBSO). Blood stain sample collection, DNA extraction, and STR analyses on the portable microsystem were conducted in the field, and a successful “mock” CODIS hit was generated on the suspect's sample within 6 h. This demonstration of on-site STR analysis establishes the feasibility of real-time DNA typing to identify the contributor of probative biological evidence at a crime scene and for real-time human identification.

Hydrodynamic and geologic influence of event-dependent depth of closure along the South Florida Atlantic Coast

This study develops a method to identify the depth of closure using airborne laser bathymetric data, and compares the measured depth of closure to calculated depth of closures and subaqueous geomorphic units. Airborne laser data sets were collected before and after the 2004 hurricane season along 100 km of beaches in Palm Beach, Broward, and Miami-Dade Counties in southeast Florida. Wave and geologic hardgrounds play different roles in determining the depth of closure from north to south in the study area. Calculated depths of closure in terms of event-dependent wave data are compatible with measured depths of closure in the northern part of the study area. In this region, diabathic channels that are hydrodynamically formed morphosedimentary features generally coincide with the measured depth of closure, indicating that the depth of closure in the northern study area is mainly controlled by storm wave energy. In contrast, for the southern part of the study area, the calculated depth of closure is on average greater than that measured. In the southern region, hardgrounds coincide with the locations of measured depth of closure, suggesting geological control.