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Neosparton ephedroides; the only population of this species in the province of Buenos Aires is restricted to 1,900 ha surrounding Pehuen-có. A, shrub's general aspect; B, inflorescence.
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Buenos Aires coastal dune systems undergo an accelerated process of human induced modification, causingloss of native plant species and changes in species composition, cover and/or abundance. We present a species list ofvascular plants recorded in a region of dune landscape between Pehuen-có and Monte Hermoso localities, southernBuenos Aires Atlant...
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Citations
... Studies in this landscape have highlighted anthropization's adverse effects on biodiversity, from native species abundance declines to species population isolation due to habitat availability reduction (Alberio & Comparatore, 2014;Austrich, Mora, Mapelli, Fameli, et al., 2020;Block et al., 2016). Thus, protecting these coastal dune habitats is vital for the long-term viability of many species in this unique natural ecosystem (Celsi & Monserrat, 2008). ...
... There are active dunes with little or no vegetation cover, and semi-fixed and fixed dunes where the vegetation has stabilized. In addition, there are interdune depressions in the area, which are associated with plant species tolerant to flooded environments (Celsi & Monserrat, 2008). ...
Subterranean rodents of the genus Ctenomys typically occupy fragmented habitats, many currently altered by anthropogenic development. These changes affect functional connectivity among individuals, reducing gene flow levels. This study assessed the functional connectivity of two sympatric species of subterranean rodents, Ctenomys australis and Ctenomys talarum, examining the impact of landscape changes on their population genetic structure at a fine spatial scale. We conducted a spatially continuous sampling over 12 km of coastline in Southeastern Buenos Aires Province, Argentina, genotyping 91 and 106 individuals of C. australis and C. talarum, respectively, using 10–12 microsatellite loci. We applied various spatial layers characterizing both species' habitats to evaluate the landscape configuration's effect on individual gene flow. We employed Bayesian genetic clustering methods to infer population structure levels. Ctenomys talarum showed greater structure than C. australis. NDVI temporal variation was the main factor influencing C. australis' genetic structure, whereas suitable habitat, linked to the current landscape configuration, was the most significant factor in shaping C. talarum's genetic structure. Differences in dispersal capacity and habitat specificity appear to have influenced the population genetic structures of these species. The results indicated varying sensitivities to landscape changes; temporal landscape variations primarily impacted C. australis' genetic connectivity, whereas for C. talarum, the current landscape configuration was more influential.
... The coast of Pehuén Co has been affected by human intervention and unplanned construction, resulting in the degradation of both the beach and the dune (Mavo Manstretta et al., 2018b). The economy of this town is based almost entirely on beach tourism (Fiori et al., 2004;Celsi and Monserrat, 2008;Rojas et al., 2014;Bustos et al., 2016a;Semeoshenkova et al., 2017). All these activities aggravate the erosion problem (Semeoshenkova et al., 2017) and the deterioration of the coastal ecosystem (Bustos, 2017). ...
... There are active dunes with little or no plant cover, and semi-fixed and fixed dunes where the vegetation has stabilized and we can find it in greater abundance. In addition, we can find the interdune depressions, which are associated with plant species tolerant to flooded environments (Oyarzabal et al. 2018;Celsi and Monserrat 2008). ...
South American rodents of the genus Ctenomys (tuco-tucos) occupy the underground environment, present high specificity to loose and friable soils and have restricted mobility, with a generally fragmented distribution. We use species distribution models (SDMs) in two Ctenomys species from the Atlantic coast and continental areas of Argentina. We develop SDMs using Maxent software for Ctenomys australis and Ctenomys talarum, which coexist in a narrow coastal landscape with restricted distributions. We model the potential distributions of both species using, first, bioclimatic variables (Group 1), and second, Landsat 8 bands and granulometric layers (Group 2). According to the known distributions of the species, the Group 2 variables showed the greatest accuracy for inferring their potential distributions. The most important variables for predicting habitat suitability were, primarily, the majority of granulometric variables and some Landsat 8 bands such as the bands 4 and 5, related to the vegetation cover. We also analyze the level of overlapping niches between these two species, and we found that there is a certain degree of geographical overlap between them, and also present ecologically similar niches, despite the fact that the characteristics of their habitats differ in certain aspects. We conclude that in tuco-tucos species, their potential distributions are better predicted by variables that consider the particular characteristics of soils and cover vegetation, since they are specialized species of substrates. Also, a higher spatial resolution allows a better performance of the Ctenomys species models, which was expected for species with restricted distributions.
... Similarly, 15 species belonging to 11 genera and 09 families of animals were encountered on the sandy beach of Rushikulya estuary and were As evident from literature that sand dune ecosystems support high species richness and diversity values (Grootjans et al., 2004;Fontana 2005;Celsi and Monserrat 2008). The present study corroborates the observation made elsewhere and also indicates that the study area preserves a rich flora and fauna with high number of native dune biodiversity. ...
... racernosum, P. urvilleanum, and S. ciliate, all of them pioneers of quicksand). Other floral species in this habitat with less representativeness are Calycera crassifolia, Hyalis argentea, and Sporobolus rigens (Celsi and Monserrat 2008;Monserrat 2010). In areas where the vegetation has stabilized (semi-fixed and fixed dunes), different genera are presented: Imperata, Poa, Ambrosia, Adesmia, Neosparton, Androtrichum, Margyricarpus, Prosopis. ...
... In areas where the vegetation has stabilized (semi-fixed and fixed dunes), different genera are presented: Imperata, Poa, Ambrosia, Adesmia, Neosparton, Androtrichum, Margyricarpus, Prosopis. In addition, interdune depressions are associated with plant species tolerant to flooded environments (Schoenoplectus californicus and Typha latifolia; Cabrera 1971; Celsi and Monserrat 2008;Monserrat 2010). ...
... Almost 20% of the area of the EBD is currently protected by natural reserves or other forms of conservation units, but without effective enforcement of protective measures. Along the SBD, only 2% of its area is protected in some way by conservation units, but far from the minimum international standard of 10 to 15% recommended to protect an ecosystem (Celsi and Monserrat 2008). Considering the outline of the results discussed above, the protection of natural habitats in Buenos Aires coastal dunes is largely overdue. ...
The Eastern Barrier of Dunes (EBD) and Southern Barrier of Dunes (SBD) extend along the coast of Buenos Aires province, Argentina. These regions have been severely altered by anthropic activities for years, mainly through the development of cities and afforestation with exotic species. We quantified the effect of anthropic activities on the landscape of coastal dunes, evaluating its temporal evolution during the last 30 years. Using Landsat satellite images from 1985, 1996, 2005, and 2015, we performed supervised classifications and obtained thematic maps for coastal dune barriers. Over these maps, we quantified the main classes of natural habitats and anthropic environments and analyzed changes in their extent and arrangement over time. Temporal analyses showed a gradual replacement of anthropic environments over natural habitats. During the last 30 years, the area impacted by anthropic activities went from 13 to 31.7% on the EBD and from 3.6 to 5.9% on the SBD. In the SBD, fragmentation along the main natural habitats increased over the years, whereas fragmentation along the EBD, although higher than that in SBD, remained constant through time. Drastic reductions of the extent of natural habitats were recorded at or near areas where anthropic environments developed. Both coastal dune barriers showed a clear advance of anthropic fragmentation over coastal dune habitats, with EBD being the most impacted by human activities.
... nutrientes y la disponibilidad de humedad del suelo (Villalobos & Zalba, 2010). Por su parte, en los últimos años, se ha incrementado la utilización de ambientes naturales sin una planificación adecuada para actividades turísticas, impactando también negativamente sobre la composición y abundancia de las especies autóctonas (Celsi & Monserrat, 2008). ...
Generalmente, cada especie de maleza tiene un patrón espacial particular, el cual afecta la interacción de la competencia cultivo-maleza o la abundancia de hábitats de plagas y enfermedades. Debido a esto, la evaluación de la estructura espacial de densidad de población o de índices de diversidad de malezas, puede ser útil para aumentar la eficiencia del manejo agroecológico, debido a que este enfoque considera que la idea de eliminar y controlar a las malezas debe ser reemplazada por la de manejar y mantener la vegetación espontánea dentro de niveles tolerables para lograr una producción económicamente aceptable y mantener sus funciones dentro del agroecosistema.
... A total of 100 species enumerated from the present study area, represented four distinct types viz., Trees (9%), Climbers (17%), Shrubs (10%), and herbs (64%) as also reported earlier in coastal areas (21,22). As several authors have pointed out in various parts of the world, many dune ecosystems support high plant richness and diversity values (23)(24)(25)(26) as also noted in this study area. ...
The ecological habitats in the Indian sub-continent vary from the humid tropical Western Ghats to the hot deserts of Rajasthan; the ice-capped mountains of the Himalaya to warm coast of Peninsular India. The present study of the Coromandel coast for the use of plants for medicinal purposes documented 100 species belonging to 88 genera in 41 families of which 27 species were administered against 17 ailments by fisherman and rural communities in the Tranquebar coastal regions of Tamil Nadu; 15 species were used in Ayurvedic systems of medicine, 16 species were used in Siddha and Unani systems of medicine, and 12 species are used against other diseases.
... & Arn. (Celsi y Monserrat, 2008). También constituyen asociaciones de especies dominantes en algunos ecosistemas y elementos característicos que forman poblaciones abundantes, como es el caso de Nassauvia fuegiana (Speg.) ...
... Comentarios: La ANP no incluye dentro de sus límites actuales los ambientes de dunas adyacentes a la playa, los cuales se destacan por su buen estado de conservación y el valor de la biota que albergan, característica del extremo sur del distrito fitogeográfico Pampeano Austral (Celsi y Monserrat, 2006, 2008b. Con el objeto de lograr una completa representatividad del ecosistema costero dentro de esta unidad de conservación y optimizar su manejo y protección, se han encaminado gestiones para la ampliación de la ANP con la inclusión del mencionado sector de dunas. ...
La provincia de Buenos Aires posee una extensa costa marítima, que alcanza los 1.000 km de longitud y abarca un amplio rango latitudinal. De norte a sur, se suceden diversas unidades biogeográficas, con una riqueza natural característica y un relevante acervo cultural ligado a ella. En términos de biodiversidad, se destacan: la presencia de especies endémicas (cuyas distribuciones se encuentran restringidas a una o pocas localidades),
la congregación de aves playeras migratorias en sitios puntuales, la existencia de relictos de pastizal nativo y su fauna asociada -en ciertos casos bajo algún grado de amenaza-, y la alta productividad de los ambientes vinculados a su plataforma marina que ofrecen condiciones óptimas para la reproducción de especies de importancia pesquera. Asimismo, la geomorfología del litoral atlántico es heterogénea, variando desde
formaciones estuariales con planicies de inundación, canales de marea, bancos e islas, lagunas perilitorales y una albúfera, costas arenosas de playas y campos de dunas, hasta acantilados y plataformas de abrasión con distinto grado de consolidación. La costa bonaerense también ha dado pruebas contundentes de albergar sitios arqueológicos y yacimientos paleontológicos de relevancia continental e inigualable valor científico. Los
bienes, recursos y servicios derivados de esta compleja configuración ambiental, constituyen focos de gran interés para la conservación, y a su vez, facilitan el asentamiento de poblaciones humanas que hacen uso de ellos. La intensidad de uso y la ocupación de los ambientes costero-marinos bonaerenses por parte del hombre se han incrementado considerablemente durante las últimas décadas. Principalmente, esto se debe al desarrollo de nuevos centros urbanos y la ampliación de los ya existentes, los usos recreativos asociados al turismo masivo, las obras portuarias y de defensa costera, como así también, a las prácticas forestales excesivas, la explotación de arenas, y el trazado de rutas y caminos (Dadon y Matteucci, 2002; Acosta y Dadon, 2008). El proceso de avance antrópico sobre la zona costera, ocurre sin una planificación territorial adecuada, bajo modalidades improvisadas e invasivas, carentes de una consideración ecosistémica y patrimonial que garantice la sustentabilidad de su uso a largo plazo y la no afectación de bienes culturales irremplazables. Estos efectos negativos se perciben sobre el ambiente natural, reflejándose en la sustitución, fragmentación, y finalmente, pérdida de hábitats naturales, con la consecuente alteración de la capacidad del ecosistema de mantener sus procesos naturales característicos, el desplazamiento o desaparición de la biota nativa y la destrucción irreversible del patrimonio cultural preservado en sus geoformas. Frente a esta problemática ambiental y cultural, se torna indispensable articular estrategias y mecanismos que permitan conservar áreas de valor especial, donde sea posible proteger la integridad del ecosistema costero. En este sentido, una de las herramientas más valoradas a nivel mundial para contrarrestar la desaparición de los espacios naturales, es la implementación de Áreas Naturales Protegidas (ANPs).
... Similarly, 15 species belonging to 11 genera and 09 families of animals were encountered on the sandy beach of Rushikulya estuary and were As evident from literature that sand dune ecosystems support high species richness and diversity values (Grootjans et al., 2004;Fontana 2005;Celsi and Monserrat 2008). The present study corroborates the observation made elsewhere and also indicates that the study area preserves a rich flora and fauna with high number of native dune biodiversity. ...
Coastal sand dunes are susceptible and fragile ecosystems with an array of floral and faunal species composition. Studies on coastal sand dunes especially those of eco-sensitive coastal and marine ecosystem of Indian coast are scanty. Hence, a detailed survey along the coast of Rushikulya sea turtle Arribada beach in Ganjam district, Odisha was carried out. A total of 37 species belonging to 32 genera and 17 families of plants and 15 species belonging to 11 genera and 09 families of faunaal elements were encountered on the beach and identified at different locations from the shoreline towards inland of the coastline. The flora and fauna composition of Rushikulya coast was found to be rich, indicates to constitute a variety of habitats and gather vital ecological and economic importance. Such sensitive ecosystems have to be protected from habitat degradation in order to protect their diversity and ecological functioning and to supporter the associated floral and faunal assemblages in the area.
