Distribution patterns and habitat associations of Sandelia bainsii ( T eleostei: A nabantidae), a highly threatened narrow‐range endemic freshwater fish

2020 ◽  
Author(s):  
Delsy S. Sifundza ◽  
Albert Chakona ◽  
Wilbert T. Kadye
Keyword(s):  
Freshwater Fish ◽  
Narrow Range ◽  
Distribution Patterns ◽  
Habitat Associations

Spatial patterns and habitat associations of Fagaceae in a hill dipterocarp forest in Ulu Gadut, West Sumatra

2008 ◽  
Vol 24 (05) ◽  
pp. 535-550 ◽  
Author(s):  
Sen Nishimura ◽  
Tsuyoshi Yoneda ◽  
Shinji Fujii ◽  
Erizal Mukhtar ◽  
Mamoru Kanzaki
Keyword(s):  
Random Distribution ◽  
Distribution Patterns ◽  
Habitat Associations ◽  
Target Species ◽  
Dipterocarp Forest ◽  
Median Distance ◽  
Preferred Habitat ◽  
West Sumatra ◽  
Hill Dipterocarp Forest ◽  
Habitat Variables

Abstract:Spatial distribution patterns and habitat associations of Fagaceae species in a Fagaceae-codominated hill forest in Sumatra were investigated. Ten Fagaceae species believed to be zoochorous (animal-dispersed seed) and five codominant canopy and emergent anemochorous (wind-dispersed seed) species from Anacardiaceae and Dipterocarpaceae were studied. Five Fagaceae species and all codominant anemochorous species were significantly aggregated while the other five Fagaceae species showed a random distribution pattern. The median distance of small saplings from the nearest reproductively mature tree tended to be shorter for aggregated species than spatially random species. This implied that some Fagaceae species dispersed over longer distances than anemochorous species. Relationships between four habitat variables and distribution of the target species were examined with torus-translation tests. ThreeQuercusand oneLithocarpusspecies showed positive habitat associations. TwoQuercusspecies aggregated at the preferred habitat, but the others were randomly distributed. Thus tree species with specific habitat preference do not only aggregate at the preferred habitat. The three ridge-specialistQuercusspecies showed gradual changes in habitat association, which could reflect avoidance of competition among the species. Most of theLithocarpusspecies showed little correlation with habitat variables. Coexistence of the threeQuercusspecies partly reflected subtle differences in topographical preferences. Distribution of five of the sixLithocarpusspecies was unrelated to topography, so other mechanisms must be sought to account for the maintenance of coexistence in this species-rich genus.

Size-related habitat use, aggregation patterns and abundance of anglerfish (Lophius budegassa) in the Mediterranean Sea determined by generalized additive modelling

2003 ◽  
Vol 83 (5) ◽  
pp. 1171-1178 ◽  
Author(s):  
Christos Maravelias ◽  
Costas Papaconstantinou
Keyword(s):  
Generalized Additive Models ◽  
Aegean Sea ◽  
Distribution Patterns ◽  
Habitat Associations ◽  
Additive Models ◽  
Seasonal Effects ◽  
Nursery Ground ◽  
Size Category ◽  
Aegean Area ◽  
Eastern Aegean

Spatial distribution patterns of black anglerfish, Lophius budegassa were examined in relation to size category, bathymetry, locational covariates, and season. Data were collected during a 2-y period (1998–1999) of quasi-synoptic seasonal sampling using demersal trawl surveys in the Aegean Sea. Generalized additive models (GAMs) were used to test the hypotheses that there was size-related variation in species' habitat associations and that the study area might serve as a nursery ground for black anglerfish. The current results supported these hypotheses. Data are presented that reveal size-dependent aggregation patterns of black anglerfish and an important habitat utilization of the north-eastern Aegean area. The modelled anglerfish abundances showed a strongly non-linear dependence on the explanatory covariates. The different size-classes exhibited significant seasonal effects and preferences for specific regions and distinct water depths. The present results also suggested that 1-y-old fish and potential spawners appeared to concentrate in the vicinity of the same areas. Two main areas of juvenile aggregations were detected in the deeper water regions of the study area on a seabed of around 300 m depth; both emerged in the proximity of the locations of larger fish. The bathymetric distribution of intermediate size anglerfish followed an inverse trend, with fish captured mainly in shallower waters. Results indicated a preferential aggregation of 1-y-old L. budegassa in the study area that is hypothesized to influence the supply of recruits to distant regions of the Aegean Sea.

Distribution patterns and taxonomy of some legume-feeding psyllids (Hemiptera: Psylloidea) and their hosts from the Iberian Peninsula, Morocco and Macaronesia

2002 ◽  
Vol 33 (3) ◽  
pp. 291-310 ◽  
Author(s):  
Diana M. Percy
Keyword(s):  
New Species ◽  
Iberian Peninsula ◽  
Host Plant ◽  
Host Plants ◽  
Narrow Range ◽  
Distribution Patterns ◽  
Morphological Characters ◽  
Immature Stages ◽  
Macaronesian Islands ◽  
Incomplete Sampling

AbstractDistribution patterns between continental and continental-island sister taxa are compared for some legume-feeding psyllids (Arytaininae, Psylloidea) and their host plants (Genisteae, Leguminosae). The host plant genera Adenocarpus, Chamaecytisus, Retama and Teline are characterized by distribution disjunctions, which sometimes match the disjunctions in the associated psyllids. Sister taxa pairs of Retama- and Teline-feeding psyllids from the continent and Macaronesian islands exhibit a similar geographic disjunction as their host plants, but this pattern is not found in Adenocarpus- or Chamaecytisus-feeding psyllids and their hosts. In addition, three closely related continental psyllids reflect the distribution of their Adenocarpus hosts in the montane regions of Morocco and Andalusia, but are not related to other Adenocarpus-feeding species. These examples suggest that among the Genisteae-feeding psyllids, shared distribution patterns with their hosts are localized rather than characteristic of the group as a whole. Six new species of psyllid, which feed on legume shrubs in the Genisteae, and are endemic to the Iberian Peninsula and Morocco, are described and illustrated. These species are in two taxonomically complex arytainine genera, Arytainilla and Livilla. Immature stages provide additional morphological characters useful for resolving taxonomic relationships within the Arytaininae, and the 5th instar nymphs of several species are described and illustrated. Genistoid-feeding psyllids are not known from all genera in the Genisteae but this may be due to incomplete sampling of rarer genistoid legumes. The majority of psyllids newly described here are narrow range endemics in either Andalusia or Morocco; one species occurs in both Andalusia and Morocco, and one species is more widespread in the Iberian Peninsula.

scholarly journals Quantifying Shark Distribution Patterns and Species-Habitat Associations: Implications of Marine Park Zoning

PLoS ONE ◽  
2014 ◽  
Vol 9 (9) ◽  
pp. e106885 ◽  
Author(s):  
Mario Espinoza ◽  
Mike Cappo ◽  
Michelle R. Heupel ◽  
Andrew J. Tobin ◽  
Colin A. Simpfendorfer
Keyword(s):  
Distribution Patterns ◽  
Habitat Associations ◽  
Marine Park

scholarly journals Distribution patterns of Procamallanus (Spirocamallanus) inopinatus (Nematoda: Camallanidae) and its interactions with freshwater fish in Brazil

2020 ◽  
Vol 29 (4) ◽  
Author(s):  
Lígia Rigôr Neves ◽  
Luís Mauricio Abdon Silva ◽  
Alexandro Cezar Florentino ◽  
Marcos Tavares-Dias
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
North Atlantic ◽  
Life Histories ◽  
Parasitic Infection ◽  
Distribution Patterns ◽  
Trophic Levels ◽  
Intermediate Hosts ◽  
Host Fish ◽  
Infection Parameters

Abstract This study used information about Procamallanus (Spirocamallanus) inopinatus Travassos, Artigas & Pereira, 1928 that had been published over a period of more than 90 years to investigate the infection and distribution patterns of this nematode in teleost freshwater fish in Brazil. This study was carried out using 181 samples from 82 fish species in 19 families within the five orders, with predominance of Characiformes species (71.6%). We organized a matrix-based parasite-host system in which the fish species were classified in different trophic levels and parasitic infection parameters according data available on host fish species with different life histories and geographic distributions across Brazilian hydrographic basins. Procamallanus (S.) inopinatus showed prevalence ranging from low to moderate, low abundance, low intensity, typically aggregated dispersion, and preferential infection of the hosts' gastrointestinal tract. There was difference in prevalence between detritivorous, omnivorous, carnivorous and piscivorous hosts, but no difference in intensity and abundance was found due to similarity in the communities of this endoparasite among the host fish species. The geographic distribution of this parasite encompasses the river of the Amazon, Paraná, São Francisco, North Atlantic, South Atlantic and Eastern basins. Lastly, suggestions regarding the life cycle of P. (S.) inopinatus, with its potential intermediate hosts, were discussed.

Urban development explains reduced genetic diversity in a narrow range endemic freshwater fish

2015 ◽  
Vol 16 (3) ◽  
pp. 625-634 ◽  
Author(s):  
Andrew Mather ◽  
Daniel Hancox ◽  
Cynthia Riginos
Keyword(s):  
Genetic Diversity ◽  
Urban Development ◽  
Freshwater Fish ◽  
Narrow Range

Visual assessment of wilting as a measure of leaf water potential and seedling drought survival

2007 ◽  
Vol 23 (4) ◽  
pp. 497-500 ◽  
Author(s):  
Bettina M. J. Engelbrecht ◽  
Melvin T. Tyree ◽  
Thomas A. Kursar
Keyword(s):  
Soil Moisture ◽  
Land Use Changes ◽  
Distribution Patterns ◽  
Visual Assessment ◽  
Habitat Associations ◽  
Natural Ecosystems ◽  
Moisture Variation ◽  
Soil Moisture Availability ◽  
Drought Survival ◽  
And Function

Rainfall and soil moisture availability vary greatly both spatially and temporally. They are prime factors influencing species distribution patterns, diversity and habitat associations in a range of biomes, and limit primary productivity in many natural ecosystems, as well as in forestry and agricultural systems (Hawkins et al. 2003, Kozlowski & Pallardy 1997, Lieth 1975). Projections of drying trends, and increased frequency and intensity of drought events with climate and land-use changes (Hulme & Viner 1998, IPCC 2001) have fuelled an increased interest in the role of drought in determining the structure and function of natural and managed forest systems (Allen & Breshears 1998, Miles et al. 2004). Such projections accentuate the need to assess, understand and predict plant reactions to drought, as well as soil moisture variation at different scales.

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