In D. affinis "sex ratio" (sr), a form of meiotic drive characterized by the production of mostly or only female progeny by certain males, is associated with two different X chromosome sequences, XS-I XL-II and XS-II XL-IV. The behavior of the two sequences differed, depending on the Y chromosome constitution, being either Y(L) or 0. Males with sequence XS-II XL-IV and Y(L) produced progenies w...

M O S T expectations relating to breeding systems have been derived under the assumption of an infinite or very large population and are based almost entirely upon deterministic theories in which random variation is discounted ( KEMPTHORNE 1957). However, the advance of a finite genetic population through time is subject to variation through random sampling as a consequence of Mendelian segrega...

Colonizations from marine to freshwater environments constitute among the most dramatic evolutionary transitions in the history of life. Colonizing dilute environments poses great challenges for acquiring essential ions against steep concentration gradients. This study explored the evolution of body fluid regulation following freshwater invasions by the copepod Eurytemora affinis. The goals of ...

The family Eucharitidae (Hymenoptera: Chalcidoidea) is recorded for the first time for the fauna of Saudi Arabia based on Hydrorhoacaffra (Westwood) and Eucharis (Psilogastrellus) affinis Bouček. The record of Hydrorhoacaffra suggests that Al-Baha and Asir provinces should be considered as part of the Afrotropical rather than the Palaearctic region. The previously unknown male of Eucharisaffini...

Collections of 'Echinorhynchus salmonis' from Britain and Ireland deposited in The Natural History Museum, London (1921.7.19.3-12 and 1952.10.30.122-127) were re-identified as Acanthocephalus clavula and Acanthocephalus lucii respectively. The amphipod, Pontoporeia affinis, European intermediate host of E. salmonis, does not occur in the British Isles, so it is concluded that E. salmonis is abs...

• Soil penetration resistance increases as a result of park reconstruction. compaction explains one-third the variability in soil macrofauna. The abundance earthworm Aporrectodea rosea after A. calliginosa decreases This study is based on an industrial city Ukraine. In 2019, 2.8 ha area was reconstructed. park’s reconstruction aimed to create comfortable environment for visitors and improve eff...

the ovipositiomil behaviour and success of anagyrus pseudococci (girault), an encyrtid endoparasitoid of mealybugs, planococcus citri (risso) and pseudococcus affinis (mask.) were studied in the laboratory. behavioural sequences during oviposition starting from the searching for the host to the post-oviposition activities were described. once encountered, the mealybug host was examined and ...

Aeshna affinis, known as “Southern Migrant Hawker, Blue-eyed Hawker” is a native odonate species uncommon in many areas of the Iberian Peninsula. Field observations Andalusia, southernmost peninsular region, are notably scarce. Several photographs one larva this species, proof its reproduction southern Spain, provided.

Somatic growth and reproduction were examined in individual laboratory-grown female Gambusia affinis fed with high (H), medium (M) and low (L) ration levels from birth to the first-time spawning. Results showed that the body length and weight, condition factor (CF), wet weight gain (WG(w)), specific growth rate in wet weight (SGR(w)) and ration levels in terms of energy (RL(e)) decreased signif...