Lateral or along-shore distribution of the polychaetous annelids of an intertidal, sandy habitat

1975 ◽  
Vol 31 (4) ◽  
pp. 363-370 ◽  
Author(s):  
D. M. Dauer ◽  
J. L. Simon
Keyword(s):  
Sandy Habitat

Tanaidacea (Crustacea: Peracarida) from Japan. IV. Shallow-water species from Akajima with notes on the recolonization potential of tanaids

Zootaxa ◽  
2008 ◽  
Vol 1678 (1) ◽  
pp. 1 ◽  
Author(s):  
KIM LARSEN ◽  
MICHITAKA SHIMOMURA
Keyword(s):  
Phylogenetic Analysis ◽  
Shallow Water ◽  
New Genus ◽  
Abundant Species ◽  
Two New Species ◽  
Sandy Habitat ◽  
Nansei Islands ◽  
Shallow Water Species ◽  
Water Species ◽  
Preliminary Phylogenetic Analysis

Two new species of tanaids were collected from colonization traps deployed in a shallow water, sandy habitat off Akajima, Nansei Islands. One new parapseudidaen, Parapseudes arenamans, and one new nototanaidaen genus and species, Paranesotanais longicephalus, are described herein. A preliminary phylogenetic analysis of the closest genera confirms the validity of the new genus and suggests a close affinity between the Leptocheliidae and Nototanaidae. Paranesotanais longicephalus was by far the most abundant species in the habitat. Parapseudes arenamans is faster in colonization of vacant substrate (opportunistic species), while being an inferior competitor to Paranesotanais longicephalus later in succession. A key to Nesotanais and Paranesotanais is provided.

Leaf traits indicate survival strategies among 42 dominant plant species in a dry, sandy habitat, China

2009 ◽  
Vol 4 (4) ◽  
pp. 477-485 ◽  
Author(s):  
Jinhuan Liu ◽  
Dehui Zeng ◽  
Zhiping Fan ◽  
David Pepper ◽  
Guangsheng Chen ◽  
...  
Keyword(s):  
Plant Species ◽  
Leaf Traits ◽  
Survival Strategies ◽  
Dominant Plant Species ◽  
Sandy Habitat

scholarly journals Cycas micronesica Trees Alter Local Soil Traits

Forests ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 565 ◽  
Author(s):  
Thomas Marler ◽  
Murukesan Krishnapillai
Keyword(s):  
Spatial Heterogeneity ◽  
Habitat Heterogeneity ◽  
Soil Chemistry ◽  
Acid Soils ◽  
Soil Types ◽  
Cascading Effects ◽  
Elemental Stoichiometry ◽  
Local Soil ◽  
Sandy Habitat ◽  
Anthropogenic Threats

Cycad plants possess uncommon morphological, chemical, and ontogenetic characteristics and they may introduce localized changes in soil traits that increase habitat heterogeneity. We used mature Cycas micronesica K.D. Hill trees growing in a range of soil types in Guam, Rota, and Yap to quantify differences between the soils beneath target trees and paired non-target soils away from cycad trees. The chronic presence of a C. micronesica tree introduced numerous localized changes in soil traits, increasing the heterogeneity of elemental stoichiometry in the community. Nitrogen, carbon:phosphorus, and nitrogen:phosphorus were increased in target soils among every soil type. Carbon increased and phosphorus decreased in most target soils. The habitats revealing the greatest number of elements with differences between target and non-target soils were the habitats with acid soils. The greatest number of metals exhibiting differences between the target and non-target soils occurred in the impoverished sandy habitat. This is the first report that indicates a cycad tree increases community spatial heterogeneity by localized changes in soil chemistry. Contemporary declines in cycad populations due to anthropogenic threats inadvertently decrease this spatial heterogeneity and its influences on primary producers in the landscape then cascading effects on the food web.

Implications of habitat-specific growth and physiological condition on juvenile crab population structure

2008 ◽  
Vol 59 (8) ◽  
pp. 726 ◽  
Author(s):  
Valter Amaral ◽  
Henrique N. Cabral ◽  
José Paula
Keyword(s):  
Physiological Condition ◽  
Size Structure ◽  
Marine Invertebrate ◽  
Carapace Width ◽  
Carcinus Maenas ◽  
Early Juvenile ◽  
Abundance Patterns ◽  
Sandy Habitat ◽  
Survival Potential ◽  
Competition For Resources

Post-settlement processes can regulate the size and structure of marine invertebrate and fish populations. Faster growth and better physiological condition generally increase the survival potential of early juveniles, being usually associated with structurally complex habitats. Successive cohorts of early juvenile Carcinus maenas were followed in sandy and seagrass (Zostera noltii) habitats in the Mira Estuary, Portugal, to estimate growth and physiological condition (evaluated by RNA/DNA ratio) of juvenile populations. Mean cohort growth was similar in both habitats. However, in the sandy habitat, population size structure progressed to cohorts of larger carapace width (CW) and the RNA/DNA ratio was always higher than in the Z. noltii habitat. In this habitat, cohorts of low CW prevailed throughout and RNA/DNA ratio only increased after ~5.0 mm CW. Higher densities characterising seagrass areas may result in higher competition for resources, limiting growth and condition and leading to dispersal to less populated habitats. Larger juveniles had the best physiological condition, especially early in the season. Seagrass habitats do not necessarily yield enhanced growth rates and physiological condition of early juvenile crabs in relation to sandy areas. Knowledge of such trends is vital to understand distribution and abundance patterns of fish and marine invertebrate populations.

A new species of Liolaemus from central steppes of Chubut, Patagonia Argentina (Reptilia: Iguania: Iguanidae)

Zootaxa ◽  
2006 ◽  
Vol 1133 (1) ◽  
pp. 61 ◽  
Author(s):  
JOSÉ A. SCOLARO ◽  
JOSÉ M. CEI
Keyword(s):  
New Species ◽  
Natural History ◽  
Sandy Habitat ◽  
A New Species

A new Liolaemus species related to “Liolaemus kingii” complex of Patagonian species, is described. It lives at about 800 m of altitude in a sandy habitat near to Somuncurá plateau. The new species and the closely related L. somuncurae are morphologically compared, and its distribution and natural history are pointed out.

Effects of off-highway vehicles on sandy habitat critical to survival of a rare beetle

2017 ◽  
Vol 11 (2) ◽  
pp. 185-193 ◽  
Author(s):  
Charles B. Knisley ◽  
Charles Gowan ◽  
Michael S. Fenster
Keyword(s):  
Sandy Habitat

scholarly journals Effects of a nurse shrub on seed deposition and seedling recruitment of the annual <i>Agriophyllum squarrosum</i>

Web Ecology ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 94-105 ◽  
Author(s):  
F.-R. Li ◽  
G. Li ◽  
L.-F. Kang ◽  
Z.-G. Huang ◽  
Q. Wang ◽  
...  
Keyword(s):  
Wind Direction ◽  
Seedling Recruitment ◽  
Common Factor ◽  
Prevailing Wind ◽  
Agriophyllum Squarrosum ◽  
Sampling Position ◽  
Prevailing Wind Direction ◽  
Sandy Habitat ◽  
Seed Deposition ◽  
Eastern Inner Mongolia

Abstract. The shrub Artemisia halodendron and the annual herb Agriophyllum squarrosum, which typically co-occur in a mobile sandy habitat in eastern inner Mongolia, China, were used to determine whether the presence of A. halodendron influences seed deposition and seedling recruitment of A. squarrosum under and around the shrub canopy in relation to wind direction, sampling position (windward vs. leeward sides) and distance from the shrub. The numbers of seeds deposited, seedlings emerged, and individuals recruited of A. squarrosum around adult shrubs were sampled along four transects aligned to the four main wind directions at 0.5, 1, 2, 3, 4.5 and 6 m from the shrub base on both windward and leeward sides of each transect. Spatial pattern of seed deposition was strongly altered by the presence of shrubs, but effects varied with wind direction, sampling position and distance from shrubs. Significantly more seeds tended to deposit on the leeward than on the windward sides in all four transects, with the exception of transects along the least prevailing wind direction. The presence of shrubs as nursing plants caused a marked variation in seed deposition across sampling locations, but this effect was detected only in the most, secondary and third most prevailing wind directions, but not in the least prevailing wind direction. In general, the shrub’s influence was within a 2 m radius from the shrub, despite some differences among transects. Although seed bank density had no direct effect on A. squarrosum recruitment patterns, it contributed to the observed variation in recruitment indirectly through density-dependent emergence of seedlings. Our findings provide further evidence of shrubs as a source of spatial heterogeneity in seed availability and thereby a common factor determining population dynamics of understorey herbaceous species.

Seasonal variability of phytoplankton in the shallow waters of the southern Baltic Sea

2017 ◽  
Vol 32 (1) ◽  
pp. 0-0
Author(s):  
Iwona Zaboroś
Keyword(s):  
Baltic Sea ◽  
Coastal Areas ◽  
Shallow Waters ◽  
Spatial And Temporal Variability ◽  
The Baltic Sea ◽  
River Waters ◽  
Phytoplankton Structure ◽  
Sandy Habitat ◽  
Temporal And Spatial ◽  
The Baltic

The Baltic Sea is characterized by seasonal variation of phytoplankton structure. These organisms are particularly sensitive to changes in various environmental factors. Because of annually repeated changes, turnover of species composition, abundance and biomass of phytoplankton is observed. Spatial and temporal variability of individual phytoplankton groups is diversified in a district parts of the Baltic Sea. Therefore, of three different coastal areas were chosen: Ustka – estuary habitat, Poddąbie – sandy habitat and Rowy – rocky bottom habitat. The aim of this paper is to determine temporal and spatial structure of phytoplankton occurrence chosen coastal areas between November 2014 and September 2016. All three studies regions the same dominants, abundance and biomass were observed. Only in Ustka region increase of the diatoms was observed. Which could see the cause of river waters wave. Seasonal phytoplankton studies in three selected habitats revealed, that in those areas that abundance and biomass is similar (75%-80%). Based on this evaluation it is can be stated that conducting phytoplankton more frequently is more important than number of research stations.

scholarly journals Rare tiger beetles (Coleoptera: Carabidae, Cicindelinae) of Croatia: new findings and current distribution

2021 ◽  
Vol 29 (2) ◽  
pp. 299-306
Author(s):  
Andreja Brigić ◽  
◽  
Snježana Vujčić-Karlo ◽  
Boris Lauš ◽  
Toni Koren ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Sandy Beach ◽  
New Records ◽  
Sand Mining ◽  
Habitat Types ◽  
Tiger Beetles ◽  
New Findings ◽  
Sandy Habitat ◽  
First Time ◽  
Sea Coast

Here we present new records of two rare tiger beetles in Croatia, their distribution and habitat selection. Cylindera trisignata trisignata (Dejean, 1822) was recorded in Croatia,for the first time in 115 years, on Mljet Island in Blace Bay. Specimens were collected on a sandy beach, 5 - 6 m from the water’s edge sea coast. Cylindera arenaria viennensis (Schrank, 1781) was found in Croatia, for the first time in 67 years, in Podravina, in Kloštar Podravski. It was collected in an area previously exploited for sand mining, which was later abandoned and left to the natural succession. Both species were recorded in rare natural or semi-natural sandy habitat types that are endangered in Croatia. The survival of these and other psammophilous species depends on the suitable management and protection of sandy habitats.

Descriptions of two new shell-dwelling species of Metriaclima (Cichlidae) from Lake Malaŵi, Africa

Zootaxa ◽  
2021 ◽  
Vol 5052 (3) ◽  
pp. 419-432
Author(s):  
TORIN A. MILLER ◽  
ADRIANUS F. KONINGS ◽  
JAY R. JR. STAUFFER
Keyword(s):  
Lake Malawi ◽  
Formal Description ◽  
Adult Males ◽  
Snout Length ◽  
Interorbital Width ◽  
Sandy Habitat ◽  
Pelvic Fin

Metriaclima is the most speciose genus of rock-dwelling fishes (mbuna) found in Lake Malaŵi with 32 described species and with about 40 recognized forms that still await formal description. The genus is comprised of many geographically narrow populations restricted to specific habitat landmarks, such as reefs or islands. A few species have taken to the open sandy habitat where empty gastropod shells provide shelter. Two species of such shell-dwellers are here described as new. A combination of a black submarginal band in the dorsal and anal fins and five or fewer bars on the flank distinguishes Metriaclima ngarae sp. n. and M. gallireyae sp. n. from all other species of Metriaclima. Metriaclima ngarae sp. n. differs from M. gallireyae by a greater interorbital width and by a greater ratio of the snout length in the distance between snout tip and pelvic fin origin. Adult males of M. gallireyae have a blue-brown overall coloration obscuring the bar pattern on the flank while males of M. ngarae and those of the closely related M. lanisticola retain the bar pattern and have a coloration very similar to that of females.  

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