9 research outputs found
Population structure, growth and production of the yellow clam Mesodesma mactroides (Bivalvia: Mesodesmatidae) from a high-energy, temperate beach in northern Argentina
The yellow clam Mesodesma mactroides (Bivalvia: Mesodesmatidae) was once the most abundant intertidal species on the Atlantic coast of northern Argentina and an important commercial resource in South America. This study of a population inhabiting the intertidal zone of the sheltered-dissipative sandy beach Santa Teresita documents the species' population biology, including demographic structure, growth and production during December 2004 and December 2006, and adumbrates the critical state of M. mactroides at present. A total of 3,015 M. mactroides were collected and measured, whereas individuals were found with an anterior-posterior shell length between 2 and 64 mm. A von Bertalanffy growth function with an asymptotic length (Lâ) of 85 mm and a growth constant (K) of 0.47 year-1 was established from length-frequency distributions. The longevity of the species is estimated at approximately 6 years, and instantaneous mortality rate was about three times higher than 40 years ago. Besides, this study confirmed that the overall growth performance index (OGP) is habitat-specific and can be used to group M. mactroides and M. donacium from different areas into temperate and upwelling species. Furthermore, OGP is inversely correlated with the latitudinal distribution of Mesodesma populations. The intertidal biomass ranged between 0.06 and 0.07 g AFDM m-2 year-1. Individual production was observed to be highest at 47 mm length (0.35 g AFDM m-2 year-1), and annual production ranged between 0.12 and 0.19 g AFDM m-2 year-1, resulting in productivity values (P/B) between 1.84 and 2.93. The comparison of the results of the present study with those of growth studies conducted on M. mactroides 40 years ago revealed the following considerable differences in the population structure of M. mactroides, indicating the conservation status of this intertidal bivalve as endangered: (1) present growth rates are faster, but that the maximum length attained has decreased, (2) the numbers of individuals per square metre were many times higher in the past than in the present, (3) bivalves from the present work never reached the 'commercial size' of 60 mm and (4) 40 years ago, the population of M. mactroides was composed of up to three cohorts, whereas in this study, there was only one single cohort visible.Fil: Herrmann, Marko. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales âBernardino Rivadaviaâ; Argentina. Johann Heinrich von ThĂŒnen Institute; AlemaniaFil: Fernandez Alfaya, Jose Elias. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales âBernardino Rivadaviaâ; ArgentinaFil: Lepore, Mauro L.. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales âBernardino Rivadaviaâ; ArgentinaFil: Penchaszadeh, Pablo Enrique. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales âBernardino Rivadaviaâ; ArgentinaFil: Arntz, Wolf E.. Institute for Polar and Marine Research; Alemani
Task Force of the Latin American Society of Hypertension
ABI, ankle-brachial index; ABPM,
ambulatory blood pressure monitoring; ACCORD, Action
to Control Cardiovascular Risk in Diabetes; ACE-I,
angiotensin-converting-enzyme-inhibitors; ARB, AT1
blockers; BP, blood pressure; CARMELA, Cardiovascular
Risk Factor Multiple Evaluation in Latin America; CARMEN,
Community Actions for Multifactorial Reduction of Non-
Communicable Diseases; CCB, calcium channel blocker;
CCM, Wagnerâs Chronic Care Model; CDC, Chronic
Disease Center; CTA, computed tomography angiography;
CV, cardiovascular; DALY, disability-adjusted life year; DPP-
4, dipeptidyl-peptidase-4; GLP-1, glucagon-like peptide 1;
HBPM, home blood pressure monitoring; HOPE, Heart
Outcomes Prevention Evaluation; HOT, Hypertension
Optimal Treatment; HT, hypertension; LA, Latin America;
LASH, Latin American Society of Hypertension; MRA,
magnetic resonance angiography; NCD, noncommunicable
disease; OSAS, obstructive apneaâhypopnea syndrome;
PAD, peripheral artery disease; PAHO, Pan American
Health Organization; RAAS, reninâangiotensinâaldosterone
system; RISS, Redes Integradas de Servicios de Salud;
SGLUT2, sodiumâglucose cotransporter-2; SPRINT, SBP
Intervention Trial; UKPDS, United Kingdom Prospective
Diabetes Study; VIDA, Veracruz Initiative for Diabetes
Awarenes