Spatial-temporal behavior of benthic communities in the Terminos Lagoon, Mexico: Possible areas of protection and conservation

2021 ◽  
Vol 3 (1) ◽  
pp. 55-76
Author(s):  
Bertha Nayeli Irola Sansores ◽  
Yassir Edén Torres Rojas ◽  
Alfonso Cuevas Jiménez
Keyword(s):  
Coastal Lagoons ◽  
Benthic Communities ◽  
Adjacent Area ◽  
Terminos Lagoon ◽  
Protected Natural Area ◽  
Spatiotemporal Behavior ◽  
Protection Area ◽  
Ecological Importance ◽  
The One ◽  
Laguna De Terminos

Terminos Lagoon is classified as a Flora and Fauna Protection Area due to the high biodiversity it registers, however, given its size, it makes total protection difficult. The objective of this study was to detect possible specific areas of conservation within the lagoon, for which an analysis of the spatiotemporal behavior of biodiversity was carried out (based on geostatistics) and thereby establish key regions of laguna de Terminos for their protection and recovery. Monthly samplings (2016-2017) were carried out by trawling with a shrimp net in 17 stations classified in 4 regions during dry (February-May), rain (June-September) and wind/winter (October-January). The organisms were identified up to the species level and the indices of abundance, richness and diversity were applied to carry out the interpolation and generation of maps. 17,950 organisms (382.9 kg) were collected and 103 species were identified. According to the interpolation of minimum curvature, at the temporal level, the rainy season was the one that presented the highest values in terms of diversity and richness, while at the spatial level, region 1 (adjacent area of Boca Atasta and Palizada river) it was the most representative during the three climatic seasons for both indices. In terms of abundance, region 2 was the one characterized by presenting the highest values. In conclusion, regions 1 and 2 represent areas of great ecological importance for the balance of biodiversity, which is why they are key areas that should be protected in Terminos Lagoon. This information would contribute significantly to knowing the state of the habitat, since it provides us with knowledge of the biological conditions of the ecosystem. Keywords: Coastal lagoons, onterpolation, Protected Natural Area, Gulf of Mexico, diversity, richness.

Morphological aspects and its influence in the ecological role of two simpatric species (Lagodon rhomboides and Archosargus rhomboidalis) in Terminos lagoon, Mexico

2021 ◽  
Vol 3 (1) ◽  
pp. 41-54
Author(s):  
Karla Gabriela Feria Alvarado ◽  
Reyna Francisca Reyna Francisca ◽  
Yassir Eden Torres Rojas ◽  
Rodolfo del Río Rodríguez
Keyword(s):  
Coastal Lagoons ◽  
Ecological Role ◽  
Lagodon Rhomboides ◽  
Morphological Aspects ◽  
Terminos Lagoon ◽  
Intestine Length ◽  
Protected Natural Area ◽  
Main Item

In Terminos Lagoon the Sparidae family is represented mainly by Lagodon rhomboides (Lr) and Archosargus rhomboidalis (Ar), both reported with herbivorous habits, however, the record of carnivorous or omnivorous habits in other regions raises questions about the correct classification of the ecological role they play and the influences that morphological aspects may have (e.g. oral difference and intestine length). The objective was to analyze the trophic role (amplitude, overlap and trophic level) through the stomach content and its possible relationship with the morphological aspects of L. rhomboides. and A. rhomboidalis during three climatic seasons (30 individuals per species per season). As results, 180 individuals were analyzed with an average total length of 14.0 ± 2.5 (cm) for both species. According to the Index Importance Geometric (IGI), Thalassia testudinum was the main item of L. rhomboides (IGI= 86.3) and A. rhomboidalis (IGI= 63.3), however, the secondary items for A. rhombiodalis (Brachidontes (Hormomya) exustus= 5.70) and L. rhomboides (Parvilucina (Parvilucina) multilineata= 16.80) were different. The trophic breadth (“Bi”) indicated that L. rhomboides. and A. rhomboidalis are specialists (BiLr= 0.02 and BiAr= 0.01). At the intraspecific level, there is high similarity (ANOSIM) in the diet of both Sparids between seasons (RLr= 0.03 and RAr= 0.05), however, at the interspecific level, low similarity was observed (Rg= 0.15), which was reflected in the NT of both Sparids (NTLr= 2.22 and NTAr= 3.71). The average buccal area was smaller in L. rhomboides (12.90 mm) compared to A. rhomboidalis (13.07 mm). Based on the intestinal index, L. rhomboides is classified. (Ii= 2.20) as herbivore, and A. rhomboidalis (Ii= 0.71) as carnivore. In conclusion, both species presented differences in trophic roles, probably related to specific morphological aspects. This information is relevant to know the vulnerability of a species from simulation studies to different phenomena such as climate change. Keywords: Herbivore, Gulf of Mexico. Protected Natural Area, ANOSIM and Coastal Lagoons.

scholarly journals Radionuclides as tracers of coastal processes in Brazil: review, synthesis, and perspectives

2008 ◽  
Vol 56 (2) ◽  
pp. 115-130 ◽  
Author(s):  
Isaac R. Santos ◽  
William C. Burnett ◽  
José M. Godoy
Keyword(s):  
Coastal Lagoons ◽  
Phosphate Fertilizer ◽  
Depositional Environments ◽  
Brazilian Coast ◽  
Petroleum Processing ◽  
Artificial Radionuclide ◽  
Economic Activities ◽  
Radium Isotopes ◽  
Erosion Processes ◽  
The One

We review the usefulness, limitations, significance, and coastal management implications of radionuclide measurements in Brazilian coastal environments. We focus on the use of radionuclides as tracers of sedimentary processes and submarine groundwater discharge (SGD). We also discuss artificial radionuclide contamination and high natural radioactivity areas. The interpretation of 14C-, 137Cs-, and 210Pb-derived sedimentation rates has provided evidence that inappropriate soil use by urban and agricultural activities has intensified erosion processes on land, which is reflected in depositional environments, such as coastal lagoons, estuaries and mangroves. Of the processes discussed in this paper, SGD is the one that requires the most scientific effort in the short-term. There have been only two case studies using 222Rn and radium isotopes as groundwater tracers in Brazil. These investigations showed that SGD can be a major source of nutrients and other dissolved species to the coastal ocean. Baseline 137Cs, 90Sr, 239+240Pu, and 238Pu concentrations in seawater from the whole Brazilian coastal zone are very low. Therefore, in spite of contamination problems in many ecosystems in the northern hemisphere, artificial radionuclide pollution appears to be negligible along the Brazilian coast. Phosphate fertilizer industries and petroleum processing facilities are the main economic activities producing Technologically Enhanced Naturally Occurring Radioactive Materials (TENORM). Even though a few attempts have been made to assess the radiological effects of these activities, their potential threats indicate a need for the radiological control of their wastes. This review showed that the number of studies within the field of environmental radioactivity is still small in Brazil and much more research is needed to understand processes of high interest for environmental managers. In the near future, it is likely that such studies in Brazil will move from descriptive, environmental quality-based assessments to approaches that attempt to quantify chemical, physical, and biological processes in the environment.

Qualitative and Quantitative Analysis of Hedgerows in Urban Areas

2019 ◽  
pp. 1-12
Author(s):  
Paullyne Charllotte Gonçalves Celestino ◽  
Lúcia de Fatima de Carvalho Chaves ◽  
André Luiz Alves de Lima Galdino ◽  
Jéssica de Oliveira Souza ◽  
Uaine Maria Félix Dos Santos ◽  
...  
Keyword(s):  
Plant Species ◽  
Rural Areas ◽  
Urban Areas ◽  
Architectural Elements ◽  
The People ◽  
Ecological Importance ◽  
Homogeneous Composition ◽  
Composition Structure ◽  
Urban And Rural Areas ◽  
The One

The research aimed to analyze the maintenance, composition, pruning, planting aspects and architectural elements on urban hedgerows. This study was carried out in an area of Imbiribeira, Recife, PE, Brazil, during six months. The survey was conducted in an area of 30 city blocks (37.024 hectares). The application of the questionnaire was directed to people residing, working, or owning real estate that contained hedgerows. Maintenance (person with the responsibility of pruning and maintenance of the hedge and types of maintenance performed on the hedges); Plant species aspects (species used were classified into groups of plant species: arboreal, shrub, herbaceous and climbing plants); Composition (homogeneous or heterogeneous); Pruning (maintenance or topiary); Planting aspects (planting alignment, spacing rhythm and dimensions of the hedge). In the study area, 30 blocks were sampled, where the presence of hedgerows was observed in 18 of them. The people responsible for the maintenance and management of hedgerows were mostly non-professional workers. The practice of watering hedgerows was found in 95.24% of the visited properties. The use fertilizer was found in 28.57% of the cases and only 4.76% of the properties use pesticide products due to phytosanitary problems. Most of the hedgerows had a homogeneous composition. Topiary pruning is the most practiced treatment on the hedgerows, with a frequency of 82.28% in the study area. The quincux planting with no definite spacing rhythm was the most found. The most observed Planting Alignment in the study area was in line. The most observed Spacing Rhythm was the one with no rhythm of planting. Although hedgerows are widely used in urban and rural areas, studies on their maintenance, composition, structure, ecological importance and relevance to biodiversity conservation are scarce.

Structure of benthic macroinvertebrates and dynamics in the northern lagoon of Tunis

2009 ◽  
Vol 89 (7) ◽  
pp. 1305-1318 ◽  
Author(s):  
S. Tlig-Zouari ◽  
T. Mami ◽  
F. Maamouri
Keyword(s):  
Benthic Macroinvertebrates ◽  
Benthic Community ◽  
Benthic Communities ◽  
Remarkable Change ◽  
Abiotic Parameters ◽  
Gulf Of Tunis ◽  
Physico Chemical ◽  
Marine Influence ◽  
The One ◽  
As Effects

Sampling data on abiotic parameters and benthic communities in the northern lagoon of Tunis were obtained seasonally from November 1999 to November 2000. Abiotic parameters studied revealed evident improvement of water quality compared with previous. Indeed, management has re-established a tidal marine influence (Gulf of Tunis), induced a remarkable change in physico-chemical parameters and as a consequence, a regulation of the lagoon environmental quality. A total of 90 species of benthic macroinvertebrates, belonging to seven different taxa were collected in the northern lagoon of Tunis. A comparison of ecological indices indicate significant variations in the spatial and seasonal distribution and structure of the benthic community and reflect changes that might be related to open marine water and climatic influences as well as effects of discharge of the neighbouring city. Generally, the lagoon macrobenthic community appeared to be better structured, richer and more diverse than the one described before sanitation works began. However, significant disturbance of the benthic communities is detected in the south-eastern lagoon zone (C) and is dominated by disturbance indicator species. In contrast, the Station A2 which is sufficiently influenced by marine currents, is dominated by species of marine affinity and indicates an undisturbed zone. Multivariate analysis indicates heterogeneity in the benthic community structure between stations and suggests that the most significant variations of abundance occur in the groups: Anthozoa, Placophora, Cephalopoda, Ascidia and Echinodermata. The results of correspondence analysis also testify to a gradational distribution of benthic species in relation to hydrological and edaphic (organic matter) factors.

Male influence on the ovarian development of the crustacean parasite Bopyrina abbreviata (Isopoda, Bopyridae)

2016 ◽  
Vol 97 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Jesús Romero-Rodríguez ◽  
Ramiro Román-Contreras ◽  
José Luis Bortolini-Rosales
Keyword(s):  
Ovarian Development ◽  
Mature Female ◽  
Ovarian Maturation ◽  
Female Reproduction ◽  
Germinal Layer ◽  
Terrestrial Isopods ◽  
Ovarian Cells ◽  
Terminos Lagoon ◽  
The One ◽  
Ventral Wall

The presence of a male in a population of terrestrial isopods can accelerate the onset of female reproduction, a feature that has been suggested also to occur in bopyrid isopods. This paper aims to estimate the influence of the male presence on the ovarian maturation of Bopyrina abbreviata. Females of B. abbreviata of different sizes were collected at Términos lagoon, Campeche, Mexico. The organisms were morphometrically classified as immature or mature, the male presence or absence at female's marsupium was recorded, and the degree of ovarian development was determined histologically. The internal organization of B. abbreviata agrees with that described for bopyrids and isopods in general. The ovarian cells originate from a dorsal lamina germinal layer that extends horizontally. The ovarian development of lone and paired immature females was classified as incipient and medium, respectively. In mature females it was classified as advanced, in the paired females and in the one lone mature female studied. The lone mature female differed from paired mature females only in the presence of reabsorption process in some oocytes located closer to the ventral wall of the ovary. Morphology variations between lone and paired females suggests that the presence of a cryptoniscus larva or a male between the female's pleopods stimulates the onset of reproduction and accelerates the ovarian development of B. abbreviata.

scholarly journals Potentially harmful cyanobacteria in oyster banks of Términos lagoon, southeastern Gulf of Mexico

2018 ◽  
Vol 23 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Carlos Antonio Poot-Delgado ◽  
Yuri B. Okolodkov ◽  
Jose Antolin Aké-Castillo ◽  
Jaime Rendón von Osten
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Terminos Lagoon ◽  
Harmful Cyanobacteria ◽  
Anabaena Sp ◽  
Laguna De Terminos

Las cianobacterias habitan en ambientes hipersalinos, marinos y de agua dulce. Algunas especies tóxicas y no tóxicas pueden formar florecimientos nocivos. El objetivo de este estudio fue identificar las especies de cianobacterias potencialmente nocivas en los bancos ostrícolas de laguna de Términos, sureste del Golfo de México. Seis sitios de muestreo (hasta 2 m de profundidad) fueron monitoreados mensualmente de agosto de 2012 a septiembre de 2013. Se midió la temperatura del agua, salinidad, pH, saturación de oxígeno, nutrientes inorgánicos y abundancia de cianobacterias. La temperatura y la salinidad se caracterizaron por marcadas diferencias estacionales (26,8 a 30,6 °C y 6,1 a 19,5, respectivamente). Los valores de pH (de 7,1 a 8,4) y la saturación de oxígeno disuelto (de 88,4 a 118,2 %) sugieren un predominio de la actividad fotosintética en la temporada de nortes (octubre-enero). Las concentraciones elevadas de los nutrientes están asociados al periodo de mayor descarga de los ríos, determinados por la circulación y los procesos biogeoquímicos. Se identificaron 14 taxa, de los cuales Anabaena sp., Merismopedia sp., Oscillatoria sp. y Cylindrospermopsis cuspis formaron florecimientos. Las abundancias de cianobacterias fueron del orden de magnitud de 106 células L-1 en octubre de 2012 en las estaciones S1-S6, con un valor promedio de 3.2x105 células L-1 y un rango de 2000 a 3.1x106 células L-1 a lo largo del periodo de estudio. Sin embargo, mostraron una ausencia notable durante la temporada de nortes (octubre a enero). Anabaena sp. y C. cuspis alcanzaron abundancias de 1.9x106 y 1.3x106 células L-1, respectivamente. Este último causó el cierre temporal de la colecta del ostión Crassostrea virginica durante 15 días en octubre de 2012.

scholarly journals Varamientos de toninas, Tursiops truncatus, en Laguna de Términos y zonas adyacentes, 2002-2013 / Strandings of bottlenose dolphins, Tursiops Truncatus, in Terminos Lagoon and adjacent areas, 2002-2013

2014 ◽  
Vol 3 (6) ◽  
pp. 40
Author(s):  
G Rivas Hernández ◽  
R Barreto Castro ◽  
A Delgado Estrella
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Terminos Lagoon ◽  
Laguna De Terminos

En el área de Laguna de Términos se han registrado un total de 115 varamientos de toninas muertas de 2002 a 2013. El mayor número de varamientos ocurrió en 2006 (n= 19), mientras que el menor número se registró en 2007 y 2011 (n= 3); la mayor frecuencia fue en mayo (n= 23 registros) y en diciembre se registraron solamente dos animales varados. El mayor número de varamientos ocurrió en la temporada de secas (n=53, 46 %), seguido de la temporada de lluvias (n=42, 37%) y la de nortes (n=20, 17 %). Del total de 115 ejemplares de Tursiops truncatus varados, 72 fueron machos (62.6 %), 19 fueron hembras (16.52 %) y a 24 organismos no se les pudo determinar el sexo (20.88 %); ocho organismos fueron crías varadas (7 %), de las cuales tres fueron crías recién nacidas. Se registraron con mayor frecuencia organismos de tamaño de entre 191-200 cm y 231-240 (n=11, para cada intervalo). En este estudio se registraron toninas correspondientes a las formas costera y oceánica.

scholarly journals Mariposas Frugívoras Capturadas por Armadilhas Atrativas em Fragmento Urbano

2015 ◽  
Vol 8 (2) ◽  
pp. 91-95
Author(s):  
Tatiane Tagliatti Maciel ◽  
Bruno Corrêa Barbosa ◽  
Helba Helena Santos-Prezoto ◽  
Fábio Prezoto
Keyword(s):  
Diversity Index ◽  
Sugarcane Juice ◽  
Great Effort ◽  
Forest Fragment ◽  
Best Response ◽  
Ecological Importance ◽  
Semideciduous Seasonal Forest ◽  
The One ◽  
Rapid Ecological Assessment ◽  
Future Work

Lepidópteros frugívoros, em geral, apresentam grande importância ecológica, sendo frequentemente utilizados como bioindicadores em estudos de avaliação ambiental. Contudo, as metodologias propostas para a captura de mariposas requerem grande esforço em campo para instalação e monitoramento das armadilhas, além de apresentarem alto custo. Com isso, iscas atrativas têm sido avaliadas para auxiliar os trabalhos de detecção e monitoramento de mariposas. O objetivo do presente estudo foi, portanto, registrar a diversidade da família Noctuidae capturada por armadilhas com atrativos alimentares e avaliar o desempenho desse modelo metodológico para sua utilização em futuros trabalhos com noctuídeos. O estudo foi realizado em área de Fragmento urbano de Floresta Estacional Semidecidual onde foram utilizados três tipos de isca: “Abacaxi com Caldo de Cana”, “Banana com Caldo de Cana” e “Banana com Água” e coletados 49 indivíduos da família Noctuidae distribuídos por seis gêneros e onze espécies. A isca “Abacaxi com caldo de cana” foi a que apresentou o maior índice de diversidade, contudo a isca que apresentou maior riqueza e maior dominância foi “Banana com água”, já a isca “Banana com caldo de cana” foi a que apresentou o maior índice de equitabilidade. A partir dos resultados, pode-se inferir que o uso de armadilhas com atrativos alimentares, em especial “Banana com água”, pode ser uma alternativa vantajosa em Avaliação Ecológica Rápida ou determinação da presença de alguns grupos como Noctuidae em determinada área, explicitando a necessidade do aprimoramento das armadilhas e testes de iscas para se obter melhor resposta das mariposas à essa metodologia.Frugivorous Moths Captured by Attractive Traps in Urban FragmentAbstract. Generally, frugivorous lepidopteran, have great ecological importance and are often used as bioindicator in environmental assessment studies. However, the proposed methodologies for capturing moths require great effort on the field for installation and monitoring of traps, in addition to their high cost. Thereat attractive baits have been evaluated to assist the work of detection and monitoring of moths. The aim of this study was, therefore, to record the diversity of the Noctuidae family captured by traps with food attractions evaluate the performance of this methodology model for its use in future work with cutworms. The study was conducted in urban semideciduous seasonal forest fragment in which three types of bait were used: pineapple with sugarcane juice, banana with sugarcane juice, and banana with water and collected 49 individuals of the Noctuidae family spread over six genera and eleven species. The bait of pineapple with sugarcane juice was the one with the highest diversity index, but the bait that showed greater wealth and greater dominance was banana with water as bait banana with sugarcane juice showed the highest equitability. From the results, it can be inferred that the use of attractive traps can be an advantageous alternative for Rapid Ecological Assessment or determining the presence of some groups as Noctuidae in a given area, explaining the need for the improvement of traps and bait tests to obtain best response of moths to this methodology.

scholarly journals Evidence of Coastal Changes in the West Coast of Naxos Island, Cyclades, Greece

2021 ◽  
Vol 9 (12) ◽  
pp. 1427
Author(s):  
Niki Evelpidou ◽  
Alexandros Petropoulos ◽  
Anna Karkani ◽  
Giannis Saitis
Keyword(s):  
Coastal Zone ◽  
Coastal Lagoons ◽  
Sand Dunes ◽  
Aegean Sea ◽  
Anthropogenic Factors ◽  
Anthropogenic Pressures ◽  
Sea Levels ◽  
Rising Sea Levels ◽  
Ecological Importance ◽  
Definition Of

Coastal lagoons and dunes are of great ecological importance, not only for providing habitats for rare flora and fauna, but also for protecting coastal areas from rising sea levels and storms, etc. Even though these features are unique for sustainable development and are extremely important to the natural environment and economy, they are one of the most vulnerable and threatened ecosystems due to their small size. The western coasts of Naxos (central Aegean Sea) represent an example of such phenomena, with various wetlands bordered by low-lying sand dunes. The aim of our study is to assess the vulnerability and pressures of the western coasts of Naxos Isl. by taking into consideration both natural and anthropogenic factors. We used a variety of approaches for the environmental and geomorphological study of the coastal zone to achieve this goal, including: (a) study of aerial photography from 1960 until today, (b) systematic seasonal aerial monitoring by drone, since 2015, (c) use of DGPS for the mapping of the coastal zone and for obtaining detailed topographic sections, and (d) dune mapping. Our findings reveal the vulnerability of the western coasts of Naxos due to sea level rise, tectonic subsidence, and a variety of anthropogenic pressures, such as uncontrolled parking, vegetation uprooting, sand extractions, and heavy touristic traffic. Therefore, the protection of the sand dunes, their restoration where they have been eroded, the definition of a zone of control, and restriction of human activities must be a key priority.

scholarly journals Nitrate-Nitrogen (N-NO3-) in Ground Waters of Agricultural Zones in Tabasco, México; Risks for Aquatic Life and Human Health

2021 ◽  
Vol 20 (3) ◽  
Author(s):  
I. Galaviz-Villa ◽  
C.A. Sosa-Villalobos ◽  
N.L. Lagunes-Reyes ◽  
C. Landeros-Sánchez ◽  
M.A. Castillo-Ferat ◽  
...  
Keyword(s):  
Nitrate Nitrogen ◽  
Coastal Lagoons ◽  
Nitrogen Concentration ◽  
Aquatic Organisms ◽  
Animal Husbandry ◽  
Economic Activities ◽  
Aquatic Life ◽  
Sources Of Pollution ◽  
Distance Weighted ◽  
Laguna De Terminos

Nitrate nitrogen (N-NO3-), the most common pollutant in groundwater, is a result of the effect of diffuse sources of pollution like agriculture and animal husbandry intensive. The land use for these economic activities is very common in the Los Ríos sub-region in the state of Tabasco, Mexico, where the Los Ríos and Boca del Cerro aquifers are located. The aim of this research was to assess the concentrations of nitrate-nitrogen (N-NO3-) in groundwater, determine the quality in agreement with the maximum permissible limits established by national and international regulations, and the risks to the public health and aquatic life. The spatial distribution of N-NO3- was determined using the inverse distance weighted (IDW) interpolation technique. The average nitrate-nitrogen concentration was 0.76 mg.L-1, while the maximum concentration observed was 3.98 mg.L1. This does not exceed the maximum permissible limit (MPL) established in the national and international normativity for drinking water. However, in 50% of the sampling sites, the concentrations of N-NO3- exceed the MPL established in Mexico for the protection of the life of seawater. Relatively low concentrations of N-NO3- have shown to be toxic to certain aquatic organisms, and the aquifers studied discharge a third of the water to the rivers in the area, which flow into the Laguna de Términos Campeche and the Gulf of Mexico. Laguna de Términos Campeche is one of the most diverse and rich environmental systems on earth, where numerous ecosystems converge such as coastal lagoons, wetlands, mangroves, seagrasses, and coral reefs.

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