Seasonal changes in tissue nutrient concentrations of macroalgae and aquatic angiosperms in Mediterranean ponds (North-Western Spain)

The present study indicates the critical role of hydrologic connectivity in floodplain waterholes in the wet–dry tropics of northern Australia. These waterbodies provide dry-season refugia for plants and animals, are a hotspot of productivity, and are a critical part in the subsistence economy of many remote Aboriginal communities. We examined seasonal changes in water quality and aquatic plant cover of floodplain waterholes, and related changes to variation of waterhole depth and visitation by livestock. The waterholes showed declining water quality through the dry season, which was exacerbated by more frequent cattle usage as conditions became progressively drier, which also increased turbidity and nutrient concentrations. Aquatic macrophyte biomass was highest in the early dry season, and declined as the dry season progressed. Remaining macrophytes were flushed out by the first wet-season flows, although they quickly re-establish later during the wet season. Waterholes of greater depth were more resistant to the effects of cattle disturbance, and seasonal flushing of the waterholes with wet-season flooding homogenised the water quality and increased plant cover of previously disparate waterholes. Therefore, maintaining high levels of connectivity between the river and its floodplain is vital for the persistence of these waterholes.

Download Full-text

Pollens of honeys from north-western Spain

Journal of Apicultural Research ◽

10.1080/00218839.1991.11101236 ◽

1991 ◽

Vol 30 (2) ◽

pp. 69-73 ◽

Cited By ~ 9

Author(s):

M V Jato ◽

A Sala-Llinares ◽

M I Iglesias ◽

M Suarez-Cervera

Keyword(s):

Western Spain ◽

North Western

Download Full-text

Evaluation of a novel Bacillus strain from a north-western Spain hot spring as a source of extracellular thermostable lipase

Journal of Chemical Technology & Biotechnology ◽

10.1002/jctb.2211 ◽

2009 ◽

Vol 84 (10) ◽

pp. 1509-1515 ◽

Cited By ~ 12

Author(s):

Francisco J. Deive ◽

M. Angeles Sanromán ◽

María A. Longo

Keyword(s):

Hot Spring ◽

Thermostable Lipase ◽

Bacillus Strain ◽

Western Spain ◽

North Western

Download Full-text

Lack of detectable genetic isolation in the cyclic rodent Microtus arvalis despite large landscape fragmentation owing to transportation infrastructures

Scientific Reports ◽

10.1038/s41598-021-91824-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Julio C. Dominguez ◽

María Calero-Riestra ◽

Pedro P. Olea ◽

Juan E. Malo ◽

Christopher P. Burridge ◽

...

Keyword(s):

Population Density ◽

Mixed Models ◽

Landscape Fragmentation ◽

Microtus Arvalis ◽

Density Peaks ◽

Genetic Patterns ◽

Large Fluctuations ◽

Genetic Impact ◽

Western Spain ◽

North Western

AbstractAlthough roads are widely seen as dispersal barriers, their genetic consequences for animals that experience large fluctuations in population density are poorly documented. We developed a spatially paired experimental design to assess the genetic impacts of roads on cyclic voles (Microtus arvalis) during a high-density phase in North-Western Spain. We compared genetic patterns from 15 paired plots bisected by three different barrier types, using linear mixed models and computing effect sizes to assess the importance of each type, and the influence of road features like width or the age of the infrastructure. Evidence of effects by roads on genetic diversity and differentiation were lacking. We speculate that the recurrent (each 3–5 generations) episodes of massive dispersal associated with population density peaks can homogenize populations and mitigate the possible genetic impact of landscape fragmentation by roads. This study highlights the importance of developing spatially replicated experimental designs that allow us to consider the large natural spatial variation in genetic parameters. More generally, these results contribute to our understanding of the not well explored effects of habitat fragmentation on dispersal in species showing “boom-bust” dynamics.

Download Full-text

Spatial associations among tree species in a temperate forest community in North-western Spain

Forest Ecology and Management ◽

10.1016/j.foreco.2010.04.039 ◽

2010 ◽

Vol 260 (4) ◽

pp. 456-465 ◽

Cited By ~ 40

Author(s):

Isabel Martínez ◽

Thorsten Wiegand ◽

Fernando González-Taboada ◽

José Ramón Obeso

Keyword(s):

Tree Species ◽

Temperate Forest ◽

Forest Community ◽

Spatial Associations ◽

Western Spain ◽

North Western

Download Full-text

A new species of Synelmis (Annelida: Polychaeta: Pilargidae) from the continental slope off Galicia (north-western Iberian peninsula)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315407056457 ◽

2007 ◽

Vol 87 (5) ◽

pp. 1117-1120

Author(s):

Juan Moreira ◽

Julio Parapar

Keyword(s):

New Species ◽

Iberian Peninsula ◽

Continental Slope ◽

Western Spain ◽

North Western ◽

A New Species

A new species of Synelmis (Annelida: Polychaeta: Pilargidae), Synelmis urgorrii sp. nov., is described from the continental slope off north-western Spain. The new species is characterized by having antennae, peristomial cirri and parapodial cirri cirriform, lateral antennae located in the proximal third of the prostomium, notospines starting on chaetigers 7–11, well-developed neuropodial lobe and asymmetrical furcate chaetae, those of anterior chaetigers distinctly spinulated.

Download Full-text

Generalized height-diameter relationship for Pinus sylvestris plantations in North-western Spain

Investigación Agraria Sistemas y Recursos Forestales ◽

10.5424/srf/2005142-00886 ◽

2005 ◽

Vol 14 (2) ◽

pp. 229 ◽

Cited By ~ 2

Author(s):

U. Diéguez-Aranda ◽

M. Barrio Anta ◽

F. Castedo Dorado ◽

J. G. Álvarez González

Keyword(s):

Pinus Sylvestris ◽

Western Spain ◽

North Western

Download Full-text

Seasonal Changes of Nutrient Concentrations in Water of Some Locations in Southern Iraqi Marshes, After Restoration.

Baghdad Science Journal ◽

10.21123/bsj.6.4.711-718 ◽

2009 ◽

Vol 6 (4) ◽

pp. 711-718

Author(s):

Baghdad Science Journal

Keyword(s):

Seasonal Changes ◽

T Test ◽

Nutrient Concentrations ◽

P Value ◽

Statistical Program ◽

Nutrients Concentration ◽

Colorimetric Methods

After restoration of Iraqi marshes during 2003, three locations were chosen, one in each main marsh (Um Al-Naaj site in Al-Hwaizeh marsh; Al-Nagarah site in Al-Hammar marsh and Al-Baghdadia site in Al-Chebaysh marsh) to determine the concentrations of nutrients (Nitrate, Nitrite, Phosphate and Silicate) in water seasonally for the period winter, spring, summer, and autumn at 2007. Five water replicates were collected from each site, seasonally. In the Lab., the samples were analyzed by colorimetric methods; the results showed that Um-Al-Naaj site has the highest nutrients level, while Al-Nagarah site has the lowest level. The statistical program t-test was applied at the significant levels (P-value < 0.01) and (P-value < 0.05) to know the significant differences in the nutrients concentration among the sites, as well as among the seasons. Statistically, the results showed that NO3, NO2, and PO4 concentrations have significant differences among the sites, as well as among the seasons. While, SiO2 concentrations have no significant differences among the sites, but they differed significantly among the seasons.

Download Full-text