Seasonality in a taxocoenosis of molluscs from soft bottoms in the Bay of Cádiz (southern Spain)

The macrofauna of molluscs associated with soft bottoms in the Bay of Cádiz (southern Spain) was studied monthly from February 1994 to January 1996. The number of species (63) is high for a soft bottom and is related to environmental characteristics (growth of macrophytes) and the biogeographical setting of the studied area. Corbula gibba (∼90%) was the dominant species in this taxocoenosis together with the gastropod Nassarius pygmaeus and the bivalves Pandora inaequivalvis, Parvicardium exiguum and Macoma melo. The most frequent species during the two years was also the bivalve Corbula gibba (100%) followed by the gastropods Nassarius pygmaeus, Tricolia tenuis, Rissoa membranacea and the bivalve Macoma melo. Total abundance of the taxocoenosis in both years reached higher values in spring. The dynamics of the ecological indices such as diversity or evenness, and the species richness showed a similar pattern in both years, with low values of diversity and evenness together with high species richness in spring and summer months and the reverse in autumn and winter. The qualitative correspondence analysis of monthly samples shows an ordination related to seasonality in both studied years, however the values of Jaccard's coefficient do not indicate significant boundaries among the monthly samples. The quantitative correspondence analysis shows an ordination and grouping of samples related to the biology of species, particularly with the recruitment of C. gibba, the dominant species. The existence of similar trends in the structure of the taxocoenoses over both years, and the seasonality highlighted by the qualitative correspondence analysis, seems to indicate a certain stability of the ecosystem.

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Is polychaete diversity in the deep sublittoral of an Antarctic fiord related to habitat complexity?

Polish Polar Research ◽

10.2478/v10183-012-0009-0 ◽

2012 ◽

Vol 33 (2) ◽

pp. 181-197 ◽

Cited By ~ 6

Author(s):

Krzysztof Pabis ◽

Jacek Siciński

Keyword(s):

Species Richness ◽

Habitat Complexity ◽

Feeding Guilds ◽

Depth Range ◽

Soft Bottom ◽

Admiralty Bay ◽

Sea Floor ◽

Species Richness And Diversity ◽

South Shetlands ◽

High Species Richness

Is polychaete diversity in the deep sublittoral of an Antarctic fiord related to habitat complexity?Seventy-six species of Polychaeta were found in 19 quantitative samples collected in the deep sublittoral (200-500 m) of Admiralty Bay (South Shetlands). Three assemblages were distinguished by similarity analysis (clustering, nMDS). The soft bottom in depths from 200 to 300m was strongly dominated byMaldane sarsi antarcticaand had very low species richness and diversity. The second assemblage was distinguished in the areas of the sea floor in the same depth range but with aggregations of Ascidiacea and Bryozoa. It was again characterized by high abundance ofMaldane sarsi antarctica, but showed significantly higher species richness and diversity. Diversity of polychaete feeding guilds was also high in these areas. This pattern was probably associated with an increased habitat complexity due to the presence of dense aggregations of large suspension feeders. High species richness and diversity was also noted in the third assemblage, associated with the deepest sublittoral (400-500 m) of Admiralty Bay. This is the area characterized by very stable environmental conditions, where the assemblage was dominated byTharyx cincinnatus, Sternaspissp.,Maldane sarsi antarctica, andAsychis amphiglypta.

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Low abundance and high species richness: the structure of the soft-bottom isopod fauna of a West Antarctic glacial fjord

Polar Biology ◽

10.1007/s00300-017-2133-0 ◽

2017 ◽

Vol 40 (11) ◽

pp. 2187-2199 ◽

Cited By ~ 2

Author(s):

Karol Zemko ◽

Krzysztof Pabis ◽

Jacek Siciński ◽

Magdalena Błażewicz

Keyword(s):

Species Richness ◽

Soft Bottom ◽

West Antarctic ◽

High Species Richness

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Community of Monogenea in populations of Cichla monoculus from two tributaries of the Amazon River in the Northern Brazil

Helminthologia ◽

10.2478/helm-2018-0043 ◽

2019 ◽

Vol 56 (1) ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

M. S. B. Oliveira ◽

E. Aparecido Adriano ◽

M. Tavares-Dias ◽

L. Lima Corrêa

Keyword(s):

Species Richness ◽

River Basin ◽

Dominant Species ◽

Geographic Distance ◽

Environmental Characteristics ◽

Mean Intensity ◽

Northern Brazil ◽

High Species Richness ◽

Qualitative Similarity ◽

Two Populations

SummaryThis study compared the monogeneans community in C. monoculus from the Tapajós River (state of Pará) and Jari River (state of Amapá), northern Brazil. A total of 2188 monogeneans belonging to eight taxa were collected from the gills of fish: Gussevia arilla, Gussevia longihaptor, Gussevia tucunarense, Gussevia undulata, Sciadicleithrum ergensi, Sciadicleithrum umbilicum, Sciadicleithrum uncinatum and Tucunarella cichlae. Gussevia arilla was the dominant species for C. monoculus from the Tapajós River basin, while S. umbilicum predominated among the hosts from the Jari River basin. For the two populations of C. monoculus, the prevalence, mean intensity and mean abundance of monogeneans were different and the of parasites community had a high qualitative similarity (87.5 %). The monogeneans community of C. monoculus was characterized by high species richness, with infection values varying from low to moderate. The geographic distance and differences in environmental characteristics arising from the same did not influence the richness of species of monogeneans infesting C. monoculus in the Tapajós and Jari rivers, but appear to have been determinants in the differences observed in the structure of the monogenean communities in each region.

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Structure of arboreal and herbaceous strata in a neotropical seasonally flooded monodominant savanna of Tabebuia aurea

Brazilian Journal of Biology ◽

10.1590/1519-6984.16612 ◽

2014 ◽

Vol 74 (2) ◽

pp. 325-337 ◽

Cited By ~ 6

Author(s):

ML. Bueno ◽

GA. Damasceno-Junior ◽

A. Pott ◽

V. Pontara ◽

EP. Seleme ◽

...

Keyword(s):

Species Richness ◽

Dominant Species ◽

Diameter Distribution ◽

Floristic Similarity ◽

Flood Level ◽

J Curve ◽

High Species Richness ◽

Seasonally Flooded ◽

Episodic Recruitment ◽

Pantanal Wetland

Large areas in the Pantanal wetland are covered by monodominant formations, e.g. typical landscapes with local names such as “paratudal”, dominated by T. aurea. Studies on structure of these formations generally include only woody strata, consequently the species richness registered is usually low due to the absence of the ‘ground layer’ of herbaceous and others low species. We recorded 13 species, 12 genera and 11 families for the arboreal stratum. Considering arboreal flora without the dominant (T. aurea) individuals showed great establishment in relation to the flood level between 35 – 45 cm while the individuals of the dominant species of 30 – 45 cm. The diameter distribution revealed that the population of T. aurea did not show the reverse J curve, the usual pattern for species in constant regeneration, also evidenced in inconstant Licourt quotient, indicating an episodic recruitment that could lead to future changes in structure. In the herbaceous strata we recorded 78 species, included in 62 genera and 27 families. Using plots method we sampled 46 species, 40 genera and 22 families, while in line interception we found 65 species distributed in 57 genera and 26 families. The floristic similarity of Sørensen between both methods was 59.4%, with 33 species in common, and the method of line interception was more efficient in detecting richness, with 35% more species found in the same time. According to the methods of plots and line interception applied on the woody stratum, our results gave similar detailed information on the structure of this type of savanna, and in spite of being monodominant it shows high species richness when the herbaceous stratum is taken into account. Plots and line interception methods showed similar results for the woody stratum and high species richness of the herbaceous stratum.

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UAS Identify and Monitor Unusual Small-Scale Rhythmic Features in the Bay of Cádiz (Spain)

Remote Sensing ◽

10.3390/rs13061188 ◽

2021 ◽

Vol 13 (6) ◽

pp. 1188

Author(s):

Lara Talavera ◽

Javier Benavente ◽

Laura Del Río

Keyword(s):

Monitoring Program ◽

Wave Theory ◽

Circulation Pattern ◽

Low Energy ◽

Small Scale ◽

Unmanned Aerial Systems ◽

Spatiotemporal Resolution ◽

Novel Technologies ◽

Bay Of Cadiz ◽

Bay Of Cádiz

Unusual shore-normal and barred-like rhythmic features were found in Camposoto Beach (Bay of Cádiz, SW Spain) during a monitoring program using unmanned aerial systems (UAS). They appeared in the backshore and persisted for 6 months (October 2017–March 2018). Their characteristics and possible formation mechanism were investigated analyzing: (1) UAS-derived high-resolution digital elevation models (DEMs), (2) hydrodynamic conditions, and (3) sediment samples. The results revealed that the features did not migrate spatially, that their wavelength was well predicted by the edge wave theory, and that they shared characteristics with both small-scale low-energy finger bars (e.g., geometry/appearance and amplitude) and swash cusps (e.g., wavelength, seaward circulation pattern, and finer and better sorted material in the runnels with respect to the crests). Our findings pinpoint to highly organized swash able to reach the backshore during spring tides under low-energy and accretionary conditions as well as backwash enhanced by conditions of water-saturated sediment. This study demonstrates that rhythmic features can appear under different modalities and beach locations than the ones observed up to date, and that their unusual nature may be attributed to the low spatiotemporal resolution of the traditional coastal surveying methods in comparison with novel technologies such as UAS.

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Biodiversity hanging by a thread: the importance of fungal litter-trapping systems in tropical rainforests

Biology Letters ◽

10.1098/rsbl.2011.1115 ◽

2011 ◽

Vol 8 (3) ◽

pp. 397-400 ◽

Cited By ~ 11

Author(s):

Jake L. Snaddon ◽

Edgar C. Turner ◽

Tom M. Fayle ◽

Chey V. Khen ◽

Paul Eggleton ◽

...

Keyword(s):

Species Richness ◽

Leaf Litter ◽

Plant Diversity ◽

Habitat Complexity ◽

Tropical Rainforests ◽

Dramatic Reduction ◽

Experimental Removal ◽

Crucial Component ◽

High Species Richness ◽

Vital Resource

The exceptionally high species richness of arthropods in tropical rainforests hinges on the complexity of the forest itself: that is, on features such as the high plant diversity, the layered nature of the canopy and the abundance and the diversity of epiphytes and litter. We here report on one important, but almost completely neglected, piece of this complex jigsaw—the intricate network of rhizomorph-forming fungi that ramify through the vegetation of the lower canopy and intercept falling leaf litter. We show that this litter-trapping network is abundant and intercepts substantial amounts of litter (257.3 kg ha −1 ): this exceeds the amount of material recorded in any other rainforest litter-trapping system. Experimental removal of this fungal network resulted in a dramatic reduction in both the abundance (decreased by 70.2 ± 4.1%) and morphospecies richness (decreased by 57.4 ± 5.1%) of arthropods. Since the lower canopy levels can contain the highest densities of arthropods, the proportion of the rainforest fauna dependent on the fungal networks is likely to be substantial. Fungal litter-trapping systems are therefore a crucial component of habitat complexity, providing a vital resource that contributes significantly to rainforest biodiversity.

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A direct comparison of the effects and mechanisms between species richness and genotype richness in a dominant species on multiple ecosystem functions

Ecology and Evolution ◽

10.1002/ece3.8125 ◽

2021 ◽

Author(s):

Man Jiang ◽

Xue Yang ◽

Tao Wang ◽

Yujuan Xu ◽

Ke Dong ◽

...

Keyword(s):

Species Richness ◽

Dominant Species ◽

Ecosystem Functions

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Tidal and seasonal carbon and nutrient dynamics of the Guadalquivir estuary and the Bay of Cádiz (SW Iberian Peninsula)

Biogeosciences ◽

10.5194/bg-10-4481-2013 ◽

2013 ◽

Vol 10 (7) ◽

pp. 4481-4491 ◽

Cited By ~ 10

Author(s):

M. Ribas-Ribas ◽

E. Anfuso ◽

A. Gómez-Parra ◽

J. M. Forja

Keyword(s):

Continental Shelf ◽

Nutrient Dynamics ◽

Diurnal Changes ◽

Gulf Of Cadiz ◽

Mean Velocity ◽

Guadalquivir Estuary ◽

Gulf Of Cádiz ◽

The Mean ◽

Bay Of Cadiz ◽

Bay Of Cádiz

Abstract. To study the effects of the physical environment on carbon and nutrient cycle dynamics on the north-eastern shelf of the Gulf of Cádiz, changes in currents, tides, salinity, temperature, carbon system parameters (fugacity of CO2 (fCO2), dissolved organic carbon, dissolved inorganic carbon (DIC) and pH) and other related parameters(dissolved oxygen, total dissolved nitrogen (TDN), nutrients and suspended particulate matter) were measured in transects across the Guadalquivir estuary and Bay of Cádiz mouths. The main objective of this study is to investigate the influence of these inner ecosystems on the carbon and nutrient distributions on the adjacent continental shelf. Three cruises were undertaken in June 2006, November 2006 and February 2007. During the whole study period, Guadalquivir estuary exported components at a rate of 3 Gmol of SiO2, 4 Gmol of DIN, 3 Gmol of TDN, 31 Gmol of DOC and 604 Gmol of DIC per year. On the other hand, Bay of Cádiz imported 3 Gmol of SiO2, 1 Gmol of DIN, 2 Gmol of TDN, 33 Gmol of DOC and 562 Gmol of DIC per year. Diurnal variability of fCO2 could have a potentially important implication on the estimate of air–sea CO2 fluxes. Tides influence velocity and transport of carbon and nutrients: we found statistically significant differences (p < 0.0001, n = 220) between the flood tide (the mean velocity was 4.85 cm s–1) and the ebb tide (the mean velocity was −5.67 cm s–1). Biological activity and diurnal changes have also an important role on the carbon and nutrient dynamics. Seasonal carbon and nutrient variations were found. During June, both systems were exporting components to the adjacent continental shelf of the Gulf of Cádiz, whereas in February both systems were importing. Monthly studies should be undertaken to completely understand this dynamic system.

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Composition and diversity of anurans in the Restinga of the Conde municipality, northern coast of the state of Bahia, northeastern Brazil

Biota Neotropica ◽

10.1590/1676-0611-bn-2016-0157 ◽

2016 ◽

Vol 16 (3) ◽

Cited By ~ 3

Author(s):

Felipe Augusto Trindade Gondim-Silva ◽

Alessandra Rodrigues Santos Andrade ◽

Rafael Oliveira Abreu ◽

Jamile Santos Nascimento ◽

Geovane Paixão Corrêa ◽

...

Keyword(s):

Species Richness ◽

Species Diversity ◽

Species Composition ◽

Rainy Season ◽

Dominant Species ◽

The State ◽

Northeastern Brazil ◽

Freshwater Wetland ◽

Northern Coast ◽

Anuran Species

Abstract The Conde municipality is located in the northern coast of the state of Bahia (NC), northeastern Brazil, and is part of the Atlantic Tropical domain. The anuran fauna of the northern portion of the NC is still poorly known if compared to the southern portion. The Restinga is one of the predominant environments of the coastal plains of the NC and it is characterized essentially by presenting sandy soil covered by herbaceous and shrubby vegetation. The objective of this study was to determine the anuran species composition and diversity for the Restinga of the Conde municipality. Sampling was carried out at night by active search over four periods of five consecutive days each, two over the 'main rainy season' and two in a 'lesser rainy season', using 14 sample units (SUs) and five extra sample plots (EPs). We calculated dominance and species diversity using the Berger-Parker and Shannon-Wiener H' indices, respectively. We used accumulation curves and the Jackknife 1 estimator to estimate anuran species richness, considering only the data obtained from the SUs. We recorded 713 anuran specimens distributed within 33 species, 13 genera and five families (Bufonidae, Craugastoridae, Hylidae, Leptodactylidae and Microhylidae). The Hylidae and Leptodactylidae families had the highest species richness. Considering only the SUs (Jackknife 1 estimator in brackets), we recorded 28 species in the study area (33.9 ± 2.3), 13 in Shrubby Vegetation Zones - SVZ (20.8 ± 2.9) and 25 in Freshwater Wetland Zones - FWZ (28.9 ± 1.9). The abundance and species diversity of the FWZ (n = 638 specimens; H'= 2.4) were higher than those recorded for the SVZ (n = 52 specimens; H' = 1.9). The SVZ and FWZ showed distinct dominant species, wherein Pristimantis paulodutrai was the dominant species in SVZ and Scinax fuscomarginatus in FWZ. The Restinga of the Conde municipality stands out as the one with the highest anuran species richness already recorded considering only SVZ and FWZ. Moreover, its anuran species composition represented 55% of the anuran species known for the NC and included taxa common to three different morphoclimatic domains (Tropical Atlantic, Cerrado and Caatinga).

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