590 Tiere (Zoologie)
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Eastern boundary upwelling provides the conditions for high marine productivity in the Canary Current System off NW-Africa. Despite its considerable importance to fisheries, knowledge on this marine ecosystem is only limited. Here, parasites were used as indicators to gain insight into the host ecology and food web of two pelagic fish species, the commercially important species Trichiurus lepturus Linnaeus, 1758, and Nealotus tripes Johnson, 1865. Fish specimens of T. lepturus (n = 104) and N. tripes (n = 91), sampled from the Canary Current System off the Senegalese coast and Cape Verde Islands, were examined, collecting data on their biometrics, diet and parasitisation. In this study, the first parasitological data on N. tripes are presented. T. lepturus mainly preyed on small pelagic Crustacea and the diet of N. tripes was dominated by small mesopelagic Teleostei. Both host species were infested by mostly generalist parasites. The parasite fauna of T. lepturus consisted of at least nine different species belonging to six taxonomic groups, with a less diverse fauna of ectoparasites and cestodes in comparison to studies in other coastal ecosystems (Brazil Current and Kuriosho Current). The zoonotic nematode Anisakis pegreffii occurred in 23% of the samples and could pose a risk regarding food safety. The parasite fauna of N. tripes was composed of at least thirteen species from seven different taxonomic groups. Its most common parasites were digenean ovigerous metacercariae, larval cestodes and a monogenean species (Diclidophoridae). The observed patterns of parasitisation in both host species indicate their trophic relationships and are typical for mesopredators from the subtropical epi- and mesopelagic. The parasite fauna, containing few dominant species with a high abundance, represents the typical species composition of an eastern boundary upwelling ecosystem.
In the insect brain, the mushroom body is a higher order brain area that is key to memory formation and sensory processing. Mushroom body (MB) extrinsic neurons leaving the output region of the MB, the lobes and the peduncle, are thought to be especially important in these processes. In the honeybee brain, a distinct class of MB extrinsic neurons, A3 neurons, are implicated in playing a role in learning. Their MB arborisations are either restricted to the lobes and the peduncle, here called A3 lobe connecting neurons, or they provide feedback information from the lobes to the input region of the MB, the calyces, here called A3 feedback neurons. In this study, we analyzed the morphology of individual A3 lobe connecting and feedback neurons using confocal imaging. A3 feedback neurons were previously assumed to innervate each lip compartment homogenously. We demonstrate here that A3 feedback neurons do not innervate whole subcompartments, but rather innervate zones of varying sizes in the MB lip, collar, and basal ring. We describe for the first time the anatomical details of A3 lobe connecting neurons and show that their connection pattern in the lobes resemble those of A3 feedback cells. Previous studies showed that A3 feedback neurons mostly connect zones of the vertical lobe that receive input from Kenyon cells of distinct calycal subcompartments with the corresponding subcompartments of the calyces. We can show that this also applies to the neck of the peduncle and the medial lobe, where both types of A3 neurons arborize only in corresponding zones in the calycal subcompartments. Some A3 lobe connecting neurons however connect multiple vertical lobe areas. Contrarily, in the medial lobe, the A3 neurons only innervate one division. We found evidence for both input and output areas in the vertical lobe. Thus, A3 neurons are more diverse than previously thought. The understanding of their detailed anatomy might enable us to derive circuit models for learning and memory and test physiological data.
Background: Chrysomya megacephala is a blow fly species of medical and forensic importance worldwide. Understanding its bionomics is essential for both designing effective fly control programs and its use in forensic investigations.
Methods: The daily flight activity, seasonal abundance related to abiotic factors (temperature, relative humidity and rainfall) and reproductive potential of this species was investigated. Adult flies were sampled twice a month for one year from July 2013 to June 2014 in three different ecotypes (forest area, longan orchard and palm plantation) of Chiang Mai Province, northern Thailand, using semi-automatic funnel traps. One-day tainted beef offal was used as bait.
Results: A total of 88,273 flies were sampled, of which 82,800 flies (93.8%) were caught during the day (from 06:00 to 18:00 h); while 5473 flies (6.2%) were caught at night (from 18:00 to 06:00 h). Concurrently, the abundance of C. megacephala was higher in the forest area (n = 31,873; 36.1%) and palm plantation (n = 31,347; 35.5%), compared to the longan orchard (n = 25,053; 28.4%). The number of females was significantly higher than that of males, exhibiting a female to male sex ratio of 2.36:1. Seasonal fluctuation revealed the highest abundance of C. megacephala in summer, but low numbers in the rainy season and winter. Fly density was significantly positively correlated with temperature, but negatively correlated with relative humidity. No correlation between numbers of C. megacephala with rainfall was found. Activity occurred throughout the daytime with high numbers from 06:00 to 18:00 h in summer and 12:00 to 18:00 h in the rainy season and winter. As for the nocturnal flight activity, a small number of flies were collected in summer and the rainy season, while none were collected in the winter. Dissection of the females indicated that fecundity was highest during the rainy season, followed by winter and summer.
Conclusions: Since the assessment of daily, seasonal activity and the reproductive potential of C. megacephala remains a crucial point to be elucidated, this extensive study offers insights into bionomics, which may be considered for integrated fly control strategies and forensic entomology issues.
Synaptic vesicle (SV) recycling enables ongoing transmitter release, even during prolonged activity. SV membrane and proteins are retrieved by ultrafast endocytosis and new SVs are formed from synaptic endosomes (large vesicles—LVs). Many proteins contribute to SV recycling, e.g., endophilin, synaptojanin, dynamin and clathrin, while the site of action of these proteins (at the plasma membrane (PM) vs. at the endosomal membrane) is only partially understood. Here, we investigated the roles of endophilin A (UNC-57), endophilin-related protein (ERP-1, homologous to human endophilin B1) and of clathrin, in SV recycling at the cholinergic neuromuscular junction (NMJ) of C. elegans. erp-1 mutants exhibited reduced transmission and a progressive reduction in optogenetically evoked muscle contraction, indicative of impaired SV recycling. This was confirmed by electrophysiology, where particularly endophilin A (UNC-57), but also endophilin B (ERP-1) mutants exhibited reduced transmission. By optogenetic and electrophysiological analysis, phenotypes in the unc-57; erp-1 double mutant are largely dominated by the unc-57 mutation, arguing for partially redundant functions of endophilins A and B, but also hinting at a back-up mechanism for neuronal endocytosis. By electron microscopy (EM), we observed that unc-57 and erp-1; unc-57 double mutants showed increased numbers of synaptic endosomes of large size, assigning a role for both proteins at the endosome, because endosomal disintegration into new SVs, but not formation of endosomes were hampered. Accordingly, only low amounts of SVs were present. Also erp-1 mutants show reduced SV numbers (but no increase in LVs), thus ERP-1 contributes to SV formation. We analyzed temperature-sensitive mutants of clathrin heavy chain (chc-1), as well as erp-1; chc-1 and unc-57; chc-1 double mutants. SV recycling phenotypes were obvious from optogenetic stimulation experiments. By EM, chc-1 mutants showed formation of numerous and large endosomes, arguing that clathrin, as shown for mammalian synapses, acts at the endosome in formation of new SVs. Without endophilins, clathrin formed endosomes at the PM, while endophilins A and B compensated for the loss of clathrin at the PM, under conditions of high SV turnover.
Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae), a Palearctic lady beetle that has become established in North America, is reported for the first time from the state of Iowa, U.S.A. The earliest specimen of H. variegata from Iowa was collected in 2009, with two subsequent specimens in 2012. Collection records of an advancing, non-native species like H. variegata are important for determining comparative rates of geographic spread across various regions and understanding its invasion dynamics.
Based on morphological features of the adult female, the Brazilian soft scale, Mesolecanium ferum Hempel, 1920 (= Toumeyella ferum) (Hemiptera: Coccomorpha: Coccidae) is transferred to the genus Neotoumeyella Kondo and Williams, 2009, as Neotoumeyella ferum (Hempel), comb. nov. The genus Neotoumeyella is rediagnosed in order to accommodate the unique features of M. ferum and an updated key to the six species of the genus is provided. An English translation of the Spanish redescription of M. ferum (as T. ferum) by Granara de Willink (2012) is also provided, with the author’s comments and interpretations.
A combination of five characters supports the arrangement of three species in the Anthocharis sara complex (Lepidoptera: Pieridae: Pierinae: Anthocharidini) consisting of Anthocharis sara Lucas, 1852 (Sara orangetip), Anthocharis thoosa Scudder, 1878 (southwestern orangetip), and Anthocharis julia W.H. Edwards, 1872 (Julia orangetip). These five characters include adult phenotypes, fifth instar larval coloration, pupal cone curvature and color, number of overwintering cycles, and interspecific contact zone behavior. This taxonomic treatment is generated from extensive life history studies from 12 western U.S. states through most of the sara complex distribution.
The Republic of Panama currently has 358 recorded species of Trichoptera. Herein we add 25 new country records for Panama. The newly recorded taxa increase Panama’s total known caddisfly fauna to 383 species, distributed among 15 families and 52 genera. These results are part of an ongoing effort to characterize the caddisfly fauna of Panama, and to evaluate that country’s major watersheds (cuencas).
There have been 136 species of microcaddisflies (Trichoptera: Hydroptilidae) recorded from the Republic of Panama. Herein we describe seven new species from the Mount Totumas Cloud Forest and Biological Reserve, in the upper reaches of the Río Chiriquí Viejo watershed (Costatrichia devestiva, C. dietrichi, Metrichia brocha, M. calla, Neotrichia atopa, Ochrotrichia anticheirion, and Rhyacopsyche totuma). These results are part of an ongoing effort to characterize the aquatic insect fauna of Panama, and to evaluate that country’s major watersheds.
Through this survey, four species of aphelinid, one species of encyrtid, and one species of signiphorid wasp (Hymenoptera: Chalcidoidea) were collected and identified as follows: Aphytis japonicus DeBach and Azim, Encarsia berlesei (Howard), Marietta carnesi (Howard), Pteroptrix sp. 2, Arrhenophagus chionaspidis Aurivillius, and Chartocerus subaenus (Förster). Among these, C. subaenus is recorded newly from the Korean parasitoid fauna. Also, three species of aphelinids and one species of signiphorid are newly added as parasitic wasps associated with Pseudaulacaspis cockerelli (Cooley) (Hemiptera: Coccoidea) from Korea. In this paper, the list of parasitoid species of P. cockerelli that occur in Korea is updated and a brief diagnosis and photographs of these species are provided.