Ciclo biológico, sobrevivência e expectativa de vida da aranha de Folhagem (Marpissa bengalensis) em pomar cítros

cr Ciência Rural Cienc. Rural 0103-8478 1678-4596 Universidade Federal de Santa Maria RESUMO: Os estádios de desenvolvimento pós-embrionário de Marpissa bengalensis (Araneae; Salticidac), a segunda espécie predatória mais abundante no pomar cítrico, foram coletadas no pomar experimental de frutas do Departamento de Horticultura, localizado no campus da Universidade de Agricultura de Faisalabad, onde foram estudados. O ciclo de biológico foi estudado no laboratório, em que iniciou a partir de ovos coletados de fêmeas grávidas e soltas em cativeiro. O período de incubação variou de 5-15 dias. a média de ovos incubados foram 23,8 ovos/casulo e a porcentagem de incubação em condições laboratoriais foi de 73,18%. A duração média da fase imatura a foi de 7 dias. Uma duração geral, média do terceiro estádio da fase imatura, foi de 7,46 dias de todas as fases imaturas incubadas com 8 casulos. A partir do quarto estádio da fase imatura a duração média foi de 10,23 dias. No quinto estádio de imaturação, demorou uma média de 19,82 dias. O sexto e o sétimo estádios de imaturação duraram um total de 23,14 e 25,86 dias, respectivamente. Durante o oitavo estádio de imaturação a duração foi de 28,08 dias, sendo máxima. Em média, desde a incubação até o estádio adulto, o estádio de imaturação duraram 137 dias. A maior mortalidade foi observada nos terciro e quarto estádios de imaturação, diminuindo, a partir de então, e atingindo zero no oitavo estádio de imaturação. INTRODUCTION: Spiders possess the characteristics of predators that can contribute to density-independent limitation of prey, including self-damping, high levels of polyphagy and life cycles that are asynchronous to those of prey species. Hunting spider made up 85.5 -91.7% of the spider fauna in peanut agro ecosystem. Spiders may play an important role in stabilizing or regulating insect’s populations because they are one of the most numerous insectivores and exhibit a wide variety of lifestyles and foraging strategies (NYFFELER et al., 1994). Spider (Arachnidae: Aranae) is a most abundant, diverse and ecologically important group in many cropping systems (HODGE, 1999; SUNDERLAND AND SAMU, 2000; TAHIR et al., 2012; Hitherto 112 families, 3924 genera and 44540 species of spiders are described in the world (PLATNICK, 2014). They live in a variety of habitat like forest, fields, foliage, ground, and even some may live amphibious life (BUKHARI et al., 2012). They have great importance in reducing and even preventing outbreaks of insect pests in agricultural fields (SUNDERLAND et al., 1986). They are capable of limiting and equilibrating pest populations (NYFFELER, 1982; SUNDERLAND AND SAMU, 2000), because of their abundance and high predatory potential (Tahir and Butt, 2009), prey specialization, polyphagy, top-down effect, numerical and functional responses, and wasteful killing (MALONEY et al., 2003). Although, the number of prey in the field fluctuate with season, time of day, microhabitat and foraging strategy (UETZ, 1991), but different spiders residing in the same field may exploit same resources (HODGE, 1999). Hunting and web-weavers are the two major clusters of spiders (UETZ 1991; NYFFELER 1982; UETZ et al., 1999) which are further divided into six to eight guilds (i.e., foliage runners, ground runners, stalkers, ambushers, sheet web weavers, wandering sheet weaver, orb weaver and space web builders) based on web use, web type and microhabitat (UETZ et al., 1999). Marpissa bengalensis is a leading species in crop growing areas of Pakistan. It is the true predator and constitutes a heterogeneous group in terms of their feeding strategies, size and activity patterns. Preliminary study on life cycle is essential for ecological work and is of significance importance to investigate the predatory potential of a species. MATERIALS AND METHODS: Field collection of Marpissa bengalensis This specie was collected from the experimental fruit garden of Horticulture department located at University of Agriculture, Faisalabad. Generally spiders were more commonly present at the curly mortal leaves of citrus plants. Marpissa bengalensis females with or without cocoone particularly were present inside the old curled leaves, males were present on fresh and middle aged leaves. Males and the females were captured by direct hand picking jarring method and were placed separately in the polythene bages and were brought to the laboratory. Males and females of Marpissa bengalensis were identified and recognized for the collection of same species in the field. Marpissa bengalensis was identified with the help of field handlens and their hiding places were traced. Laboratory experiment Gravid females with or without cocoon were captured from the foliage of citrus trees and kept for the study of their daily activity and other behaviors such as hatching, post hatching developmental stages as spiderlings, their clutch size, brood care survivorship and mortality rate at each developmental stages till the adulthood in the laboratory. At first hatching all young ones remained inside the cocoon and after 2 -3 days they come out o f the cocoons and ride on their mother back for 5-6 days. At the end of the second spiderling stage, they leave their mother, shed off their skin and attached them to the cage roof, so being able to move freely. Now each spiderling was transferred to the ennumbered cages. Latter on small pres like aphid, Jassid, whiteflies, fruit flies and large prey like mosquitoes, house flies, honey bees, grasshopper were meshed and then given to these young ones for their survival and their molting was also observed till adult. Remaining preys were cleaned and removed daily to avoid fungal and bacterial attacks. Daily observation chart was dully filed in the laboratory for the record of different developmental stages. Statistical analysis The data observed was analyzed for survivorship, mortality and life expectancy at different stages up to 8th instar. The survivourship (Lx) shall be calculated as Lx = Nx/No Where Nx = number of individual which were alive in each stage. No = Total number of eggs which hatched. Life expectanc (ex) shall be calculated as: Ex = Tx/Lx Where Tx = total number of remainder days in the life of an individual that had reached at X, stage Tx = ∑mxLx m, being the maximum age which was reached RESULTS AND DISCUSSION: Eight Marpissa bengalensis females with cocoon were released in separate cages. An average incubation period range was recorded as 5-15 days. Hatching percentage was recorded as 73.18% (Table 1). No hatching took place in the cocoons without female. Table 1 Hatching % age of eggs from each cocoons of Marpissa bengalensis. No of cocoons 1 2 3 4 5 6 7 8 Total Mean ± SD Total eggs 35 30 28 25 30 35 38 40 261 32.6±5.18 Eggs Hatched 28 25 20 18 15 20 30 35 191 23.87±6.97 The hatched spiderlings remained inside the cocoon where two moults took place and pre-larva changed into spiderling. Similar findings have been reported by RUBY et al. (2012). ENDERS (1996) studied that Lycosid spiders have higher egg production. After emergence, the spiderlings climbed on mothers back and ride until they able to move independently. This period is known as brood care and female do not feed in this phase. FOELIX AND CHU-WANG (1973) reported that the mother accesses her offspring during hatching and spiderlings climb on her back. All the spiderlings passed six developmental stages before reaching adulthood. An average duration for 3rd spiderling stage was 7.46 days. For 4th spiderling stage the duration increased to 10.23 days. In the 5th spiderling stage, the spiderling spent an average of 19.82 days. Similarly for sixth, seventh and eighth spiderling stage the average duration was 23.14, 25.86 and 28.08 respectively (Table 2). Greater mortality was observed in the 3rd and 4th spiderling stages, decreasing thereafter and reaching zero in the 8th spiderling stage (Table 3). Mortality rate at 3rd and 4th stage spiderling was in accordance with MINERVINO (1993). Large body size decreased mortality which is attained by extending growth period (Clader, 1984). The average duration of maturity period for male was recorded as 112 days and ranged from 112- 120 whereas, for female it was 126 days ranging from 121- 134 (Table 2). Table 2 Average duration (days) and range of life cycle of Marpissa bengalensis. Developmental stages Range Average duration (days) 3rd spiderling stage 5-10 7.38 4th spiderling stage 7-16 10.20 5th spiderling stage 15-25 19.95 6th spiderling stage 18-30 23 7th spiderling stage 22-30 25.59 8th spiderling stage 25-31 28.08 Table 3 Survivershiop (Lx) and life expectancy in different developmental stages of Marpissa bengalensis. Developmental stages N Lx ex 3rd spiderling stage 137 0.72 3.15 4th spiderling stage 113 0.59 7.12 5th spiderling stage 94 0.49 8.70 6th spiderling stage 86 0.45 9.02 7th spiderling stage 78 0.41 11.25 8th spiderling stage 78 0.41 11.25 There are reports of low mortality rate by Hibana velox, Chiracanthium inclusum and Trachelas volutes on combination of natural diets (AMALIN et al., 2002). Similar trend of comparatively less mortality or in other words better survival rate was observed with combined natural diets. The presence of above discussed nutrients probably explains the higher percent survival and normal development of spiders on the combination diet and also proved that the experimental species is also a nectar feeder as reported by Taylor and Foster (1996). In conclusion it is suggested that mass rearing of such important predatory species against serious crop pests could be employed. REFERENCES: AMALIN, D.M. et al. 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