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1.
Chirocephalus ponticus n.sp. (Crustacea: Anostraca) from Turkey is described. The new species is characterized by the form
of the second antenna and the frontal appendages of the male. This species seems to be related to C. turkestanicus Daday.
Furthermore, analysis of limb structure reveals differences between the three Chirocephalus species previously known from
Turkey: C. paphlagonicus, C. vornatscheriand C. diaphanus. New localities for these species are reported.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
2.
Between 1995 and 1999, we surveyed the large branchiopods (Crustacea, Branchiopoda) of Numidia, the coastal plain of northeastern Algeria. Samples from ca 100 sites yielded two species of Anostraca (Chirocephalus diaphanus, new to Numidia, and Tanymastix stagnalis), one notostracan (Lepidurus apus lubbocki) and one spinicaudatan (Cyzicus tetracerus). The absence of Streptocephalus torvicornis buchetiis noteworthy. An annotated check-list of all large branchiopods known from Algeria is also presented and discussed. Several species appear to be in danger of extinction. 相似文献
3.
Graziella Mura 《Hydrobiologia》1991,212(1):45-59
Life histories of two coexisting Anostracan species, inhabiting a group of mountain ponds in Latium (Pantani di Forca Canapine) are described and discussed, with particular regard to hatching requirements, growth rate, fecundity and life span.Unlike previously assumed (Mura, 1985), the cysts of the two species Tanymastix stagnalis and Chirocephalus diaphanus seem to respond to the same hatching stimuli, since their nauplii coexist and can be separated by morphological differences.Significant differences recorded as to size, time in attaining sexual maturity, fecundity and life span, are in favour of a niche separation by size and by time. In particular, size differences are supposed to reflect significant differences also at filtering apparatus level, thus allowing prey selection by size. 相似文献
4.
Anostraca of the Indian Subcontinent 总被引:2,自引:2,他引:0
There are 15 species of Anostraca belonging to 6 genera on the Indian Subcontinent. These are:Artemia sp. (reportedly a bisexual form of undetermined species);Artemia parthenogenetica Bowen & Sterling, 1978;Branchinecta orientalis Sars, 1901;Branchinella hardingi (Qadri & Baqai, 1956);Branchinella kugenumaensis (Ishikawa, 1895);Branchinella ornata Daday, 1910;Branchipodopsis acanthopenes (Malhotra & Duda, 1970);Branchipodopsis affinis Sars, 1901;Branchipus schaefferi Fischer, 1834;Chirocephalus priscus (Daday, 1910);Streptocephalus dichotomus Baird, 1860;Streptocephalus echinus Bond, 1934;Streptocephalus longimanus Bond, 1934;Streptocephalus simplex Gurney, 1906;Streptocephalus spinifer Gurney, 1906.Comparing numbers of species for southern India with other reasonably well studied areas, demonstrated that anostracan species richness is higher in the climatically more varied temperate regions than it is in the more uniform tropics. Tropical South India has six species compared to 13 in Arizona (USA), 19 in California (USA), 10 in Morocco, and 14 in Italy. 相似文献
5.
Wild populations of five Chirocephalus species from Italy were tested for their fatty acid profiles, particularly essential
fatty acids (EFA) in order to obtain information on species differences. Chirocephalus diaphanus, C. kerkyrensis and C. salinus
were from temporary plain pools, whereas C. ruffoi and C. marchesonii came from a mountain pool and an astatic high altitude
lake. Statistical comparisons of the results obtained revealed significant (P < 0.05) qualitative and quantitative differences
among the species studied. Besides genetic make-up, other factors are presumably involved in these differences. Among these,
environmental stability, and hence food quality and quantity, may play a major role, an hypothesis supported by previous findings
regarding the possibility of manipulating fairy shrimp fatty acid patterns by using different diets. Further investigation
is needed, however, on the fatty acid composition of the food resources from different habitats in relation to the fairy shrimp
inhabitants.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
6.
Life histories of two populations of Tanymastix stagnalisfrom sites in central Italy, differing in climate and altitude above sea level, were compared to obtain information on the tolerance limits of this species.Temperature was the main factor affecting the biology of Tanymastix stagnalis. Significant differences in growth patterns occurred at different sites. A colder climate induced delayed hatching, slower differentiation and maturation, but a longer life span in the mountain population (Forca Canapine) than in the plain (Fosso dei Mergani).Both populations exhibited an initial fluctuating sex ratio, which later became female biased, a pattern which could be the consequence of adaptation to the unstable nature of the biotopes studied. 相似文献
7.
ALINE WATERKEYN PATRICK GRILLAS ELS R. M. DE ROECK LIESBET BOVEN LUC BRENDONCK 《Freshwater Biology》2009,54(6):1256-1270
1. To monitor the diversity and distribution patterns of large branchiopods and the effects of local and regional processes, 30 temporary wetlands in a nature reserve in the Camargue (southern France) were sampled and characterised during three consecutive inundations (2005–08). Additional species were added to the list for each wetland by hatching animals from the resting egg bank, after determining the optimal hatching conditions.
2. A total of five species were found, representing 28% of the species known in France and 56% of the known Camargue species. Tanymastix stagnalis , Branchipus schaefferi , Chirocephalus diaphanus (Anostraca), Triops cancriformis (Notostraca) and Imnadia yeyetta (Spinicaudata) were distributed over a total of 19 wetlands.
3. More than one species was present in 79% of the wetlands containing large branchiopods. Individual wetlands harboured on average 2.8 species, with a maximum of five coexisting species. Large branchiopod assemblages were temporally variable, differing among the three inundations with different climatological conditions.
4. The most important habitat factor influencing the distribution of large branchiopods was salinity, adversely affecting the density and survival of hatchlings. The persistence of large branchiopods in these temporary waters may be threatened by increasing salinisation driven by intensive water management and climate change. 相似文献
2. A total of five species were found, representing 28% of the species known in France and 56% of the known Camargue species. Tanymastix stagnalis , Branchipus schaefferi , Chirocephalus diaphanus (Anostraca), Triops cancriformis (Notostraca) and Imnadia yeyetta (Spinicaudata) were distributed over a total of 19 wetlands.
3. More than one species was present in 79% of the wetlands containing large branchiopods. Individual wetlands harboured on average 2.8 species, with a maximum of five coexisting species. Large branchiopod assemblages were temporally variable, differing among the three inundations with different climatological conditions.
4. The most important habitat factor influencing the distribution of large branchiopods was salinity, adversely affecting the density and survival of hatchlings. The persistence of large branchiopods in these temporary waters may be threatened by increasing salinisation driven by intensive water management and climate change. 相似文献
8.
In the present study we applied a discriminant function analysis to distinguish two fairy shrimp species, Branchipus schaefferi and Tanymastix stagnalis (Anostraca), co-occurring in Lago dell’Orso in central Italy. Our aim was to obtain information on the pattern of coexistence of these two species to investigate their syntopy since early larval stages. To identify the larvae of the two species we used six discriminant functions, one for each larval stage considered (nauplius, four metanauplius stages and juvenis), and based on morphometric analyses and measurements of different traits (thoracic appendages, body length, length of first antenna, length of head, thorax length and length of furca). The pool was visited at weekly intervals during two time periods for a total of 4 years (1995–1996 and 2000–2001) and physical and chemical variables (water level, water and air temperature, pH and conductivity) were recorded. A total of 1067 specimens were collected, measured and morphometrically identified. B. schaefferi was more abundant and persistent than T. stagnalis. At any stage, T. stagnalis was bigger than B. schaefferi and this difference may justify niche differentiation between coexisting species. Difference in size might be linked to difference in life-span as B. schaefferi reproduced earlier and at a smaller size than T. stagnalis. When the hydroperiod is short, B. schaefferi might be the only species to produce resting eggs in time for reproduction. On the other hand, T. stagnalis may have an advantage in the longest hydroperiods. In an ephemeral seasonal pond such as Lago dell’Orso, coexistence can be fostered and competitive exclusion can be prevented as a result of seasonal environmental changes. 相似文献
9.
Comparative morphological analysis of different populations ofChirocephalus diaphanus Prevost, 1803 found in Yugoslavia has shown that the population from Ratari exhibits some peculiarities and differs from all known subspecies. Our investigations contribute to a better understanding of the taxonomic position of this form and of the phylogenetic relations within the diaphanus group. 相似文献
10.
The early observation from 1914 of Tanymastix stagnalis in Norway was not repeated recently, showing a rare and restricted distribution of this species. All four sampled localities were concentrated in the same area of the Trollheimen Mountains with altitudes of 900–1244 m above sea level. In March 2002, a new population of T. stagnalis was observed at about 50 km north of Madrid at an altitude of 1350 m. In general, all habitats with T. stagnalis were fishless shallow ponds and varied in size from 1 to about 300 m2. Natural variability of the global temperature is well accepted, but recent climate models have predicted increases in global average temperature. Based on the new biogeographical distribution, diurnal temperature variations, and biological evidence (inference with the analysis of mitochondria DNA), the immigration history of T. stagnalis was considered on the basis of two opposing immigration theories and in relation to the implications of global climate change. Two immigration theories, namely – the Tabula rasa and Nunatak, have prevailed in explaining the present distribution of plants and animals in Scandinavia. It was concluded that the rare occurrence of T. stagnalis in Norway fits into the Nunatak theory and that the species probably survived, at least, the last glaciation on Nunataks or coast refuges located in central northwestern Norway at Møre mountain and coast areas. 相似文献
11.
Horizontal distribution and abundance of cysts of several large branchiopods in temporary pool and ditch sediments 总被引:4,自引:4,他引:0
Cysts of three species of anostracans (Branchipusschaefferi, Chirocephalus diaphanus, and Tanymastigites perrieri), two species
of Notostracans (Triops numidicus and Lepidurus apus) and one species of Spinicaudata (Leptestheriamayeti) were collected
from the upper 2 cm of dry sediments at intervals along transects from a temporary pool in an arid zone of Morocco and from
two ditches in France. The horizontal distribution of viable cysts was patchy and is discussed in relation to several ecological
parameters prevailing during the aquatic phase. These include vegetation distribution, depth and morphometry of the pond,
dominant wind pattern, and granularity of the sediments.
The densities reached more than 1700 cysts of C. diaphanus per 100 cm2, and 1150 cysts of L. apus per 100 cm2 in the two ditches. The mean densities of cysts per 100 cm2 calculated for each transect ranged from 250 to 450 for C. diaphanous and 240 to 260 for L. apus (in the ditch populations)
and about 1–6 for T. perrieri and L. mayeti, 3–15 for B. schaefferi, and16–58 for T. numidicus in the pool in Morocco.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
12.
Anostracans were found living in ephemeral pools in the dark sections of three caves on the As Summan Plateau in Saudi Arabia.
Branchipus schaefferi Fischer, 1834 occurred alone in one while it cohabited with Streptocephalus torvicornisbucheti Daday,
1910 in a second cave; fairy shrimps were observed but not collected from the third. None of the specimens demonstrated any
of the types of morphological changes typically associated with cave adapted species. This is likely due to continuing colonization
of the pools during flooding events.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
13.
Cauchie Henry-Michel Murugan Gopal Thomé Jean-Pierre Dumont Henri J. 《Hydrobiologia》1997,359(1-3):223-228
Chitin was assayed in adults of nine anostracan species (Streptocephalus dichotomus, S. proboscideus, S. simplex, S. torvicornis,
Thamnocephalus platyurus, Dendrocephalus brasiliensis, Chirocephalus diaphanus, Artemia salina and Branchipus schaefferi)
using a highly specific enzymatic method. Cysts of A. salina, T. platyurus and larvae of A. salina and S. simplex were also
analysed for their chitin content. The results demonstrated a weak interspecific variation in chitin content among the adults.
On the whole, it ranged from 9 to 33 mg chitin (g dry mass)−1. In most species, the chitin level was not significantly different between males and females. In contrast, chitin levels
varied significantly between cysts, larvae and adults within species. Comparison of the chitin content of anostracans revealed
a comparable or lower chitin level than other crustaceans.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
14.
Temporary water bodies exhibit a high level of biodiversity,much of which is unique tothese habitats.Studies of microturbellarian community ecology in temporary pools are scarce,eventhough turbellarians are potentially important in organizing community structure.Moreover,therehas been virtually no documentation of microturbellarians from Israel.We examined the re-lationships between several pool properties (surface area,water depth,permanence and sedimentdepth)and microturbellarian species richness among 52 temporary pools at a single site.A total of17 taxa of microturbellarians were identi ed,of which 14 were determined to genus or species level.Richness was positively related with surface area and with maximal sediment depth,togetherexplaining 54%of the variance.In more intensive sampling of a subset of 18 pools,surface areawas the only signi cant predictor,explaining 76%of the variance.Community dissimilarity waspositively related with di erences in both surface area and permanence.We identi ed three cate-gories of pool size,each characterized by di erent turbellarian species:large pools were dominatedbyCastrada viridis andGieysztoria cuspidata ,intermediate pools byDochmiotrema limicola ,and many of the small pools byGieysztoria ornata andOlisthanella obtusa .Large pools contributed themost to regional diversity,with 11 of the 17 observed taxa.However,some species were unique tosmall pools.Thus,in order to maintain maximal regional diversity of temporary water turbellar-ians,it is important to conserve habitats containing pools of various sizes. 相似文献
15.
Fairy shrimp (Crustacea: Anostraca) are specialist inhabitants of temporary aquatic habitats. In many parts of the world and particularly in Western Europe, however, populations are declining while the development of adequate conservation strategies is impeded by a poor knowledge of the genetic structure and taxonomic status of remaining lineages. We reconstructed a phylogeography of the species Chirocephalus diaphanus Prévost, 1803 using partial sequences of the mitochondrial COI gene and discuss the importance of different Pleistocene refugia to explain current diversity patterns. In addition to 20 C. diaphanus populations, we also included populations of six presumably closely related chirocephalids to evaluate their taxonomic status. Based on molecular data, the Eastern European subspecies C. diaphanus romanicus deserves species status while the species status of two Italian chirocephalids, C. salinus and C. ruffoi is questionable. Results indicate European C. diaphanus lineages diverged well before the last glacial maximum and survived the Pleistocene glaciations in multiple (sub)refugia along the Iberian, Italian, and Balkan peninsula. Northern Europe was subsequently recolonized from Southern France, resulting in high levels of cryptic diversity around glacial refugia but also in more widespread haplotypes in mainland Europe. 相似文献
16.
The investigations of Anostraca, Notostraca and Conchostraca in Yugoslavia began after a great delay compared with other European
countries. Intensive systematic investigations date back only to the 1970s.To date, 19 species have been recorded. All species,
with the exception of Artemia salina, are faunal elements of the Pannonian region.
Seven species, including Artemia salina, Branchinecta orientalis, Branchipus serbicus, Leptestheria dahalacensis, Limnadia
lenticularis, Imnadia cristata and Imnadia panonica are known from single localities. Six species including Branchinecta ferox,
Chirocephalus brevipalpis, Chirocephalus carnuntanus, Lepidurus apus, Eoleptestheria spinosa and Imnadia banatica have restricted
distributions. Streptocephalus torvicornis and Cyzicus tetracerus are known from several localities, while Branchipus schaefferi,
Chirocephalus diaphanus, Triops cancriformis and Leptestheria saetosaare common.
Large branchiopods are mainly confined to anthropogenic landscapes, especially in the northern part of the country. Rare species
inhabiting a single pond, or those with rather restricted distributions, are the most endangered and such species account
for about 70% of the fauna. Limnadia lenticularis, Imnadia cristata and I. panonica have not been found for more than 20 years
and they are probably extinct in Yugoslavia. Branchipus serbicus, Imnadia cristata and panonica have not been documented since
being originally described.
Eoleptestheria spinosa is currently the most endangered species since it only appears irregularly in small populations. At
present, Branchinecta ferox, Chirocephalus carnuntanus and Imnadia banatica are the safest of the rare species as they regularly
appear in large numbers. There are no large branchiopods on the List of protected animals in Yugoslavia.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
17.
Taphonomy and diagenesis in diatom assemblages; a Late Pleistocene palaeoecological study from Lake Magadi,Kenya 总被引:8,自引:8,他引:0
During these investigations the following species of Anostraca have been found: Chirocephalus diaphanus Prevost 1803, Chirocephalus brevipalpis (Orghidan, 1953), Streptocephalus torvicornis Waga 1892, Branchipus serbicus Marinek & Petrov 1988, Branchipus stagnalis L. (1758) and Branchipus sp. Thus, the total number of species discovered in Yugoslavia is 13.The shape of the frontal shield and the degree of flexure of the distal articles of antennae II in males are of no relevance to taxonomy in the genus Branchipus Schaeffer 1776. However, the apophyses on antennae II in males, shape of antennae II and of the ovisac in females, structure of eggs, and of appendages appear species-specific. We conclude that the differentiation of B. stagnalis into two forms (forma typica and forma visnyai) as well as the separation of B. visnyai Kertész 1956 as a distinct species are unfounded. 相似文献
18.
B. P. M. Krebs 《Aquatic Ecology》1982,16(2-3):159-164
Summary A survey of the distribution ofSigara selecta (Fieber) in the south-west Netherlands is reported. Some chemical, physical and biological parameters are presented. The species was found in about 20, for the greater part mesohaline and polyhaline, inland waters, usually accompanied bySigara stagnalis (Leach). In these waters an increase in the density of the vegetation is accompanied by a replacement ofS. stagnalis byS. selecta.Communication nr. 246 相似文献
19.
20.
The species status ofDermacentor marginatus andDermacentor reticulatus was evaluated by scanning electron microscope (SEM) examination of adult ticks, cross-breeding experiments and molecular biological analysis of eggs derived from transspecific pairings. The SEM investigations including the morphometric quantification of phenotypic features, resulted in an unequivocal differentiation of adultD. marginatus andD. reticulatus ticks. The cross-breeding experiments demonstrated that irrespective of whether female ticks of both species were applied with con- or transspecific male ticks or without males to sheep, they engorged and laid eggs. The larvae, however, developed only in eggs which originated from conspecific matings. A nested polymerase chain reaction (PCR) of the second internal transcribed spacer (ITS2) using the DNA of eggs from transspecific pairings and sequencing of the PCR products revealed two different genotypes. The genotypes of eggs originating fromD. marginatus andD. reticulatus females of these pairings differed. However, the eggs deposited byD. marginatus always possessed the same two genotypes as did the eggs produced byD. reticulatus. These results argue for a strict reproductive isolation ofD. marginatus andD. reticulatus and, therefore, for a separate species status. 相似文献