Dancing close together in the woods: mate-guarding behavior might explain sexual dimorphism in Chrysoprasis auriventris auriventris Redtenbacher, 1868 (Coleoptera: Cerambycinae)

ABSTRACT A fortuitous observation of mate-guarding behavior of male Chrysoprasis a. auriventris is presented here. In our observation, a male hold onto the female's body using his forelegs and walks along with her while she lays the eggs into the trunk slits. While guarding the female, the male adopted aggressive postures and attacked rival males that approached her. We suggest that the mate-guarding behavior may explain the male's elongated mid and hindlegs in this species, under a functional perspective. Additionally, a new host plant association was recorded.

Multiple-scale intermuscular coupling network analysis / 生物医学工程学杂志

In order to more accurately and effectively understand the intermuscular coupling of different temporal and spatial levels from the perspective of complex networks, a new multi-scale intermuscular coupling network analysis method was proposed in this paper. The multivariate variational modal decomposition (MVMD) and Copula mutual information (Copula MI) were combined to construct an intermuscular coupling network model based on MVMD-Copula MI, and the characteristics of intermuscular coupling of multiple muscles of upper limbs in different time-frequency scales during reaching exercise in healthy subjects were analyzed by using the network parameters such as node strength and clustering coefficient. The experimental results showed that there are obvious differences in the characteristics of intermuscular coupling in the six time-frequency scales. Specifically, the triceps brachii (TB) had relatively high coupling strength with the middle deltoid (MD) and posterior deltoid (PD), and the intermuscular function was closely connected. However, the biceps brachii (BB) was independent of other muscles. The intermuscular coupling network had scale differences. MVMD-Copula MI can quantitatively describe the relationship of multi-scale intermuscular coupling strength, which has good application prospects.

The genital and anal papillae of Compsura heterura (Characidae: Cheirodontinae): morphological structure and possible role in insemination

The function of the genital and anal papillae for insemination in Compsura heterura is discussed based on the description of their morphologies at different stages of the life cycle and during copulation and spawning. In males and females both the genital and anal papillae are involved in copulation in C. heterura. A pre-anal organ, anterior to the anus and stretched posteriorly, is present in adult males. The openings of the urinary channel and oviduct are separate in females. During copulation, there is an approximation between the female genital and anal papillae which become temporarily juxtaposed, forming a chamber enclosing the opening of the oviduct, which may also function in sperm capture. During spawning, the lateral edges of the female genital papilla are projected anteriorly, acquiring a tubular shape for oviposition.(AU)

A função das papilas genital e anal na inseminação em Compsura heterura é discutida com base na descrição de suas morfologias em diferentes estágios do ciclo de vida e por ocasião da cópula e desova. Em machos e fêmeas, as papilas genital e anal estão envolvidas na cópula. Um órgão pré-anal, anterior ao ânus e alongado posteriormente, está presente em machos adultos. Fêmeas possuem aberturas urinária e genital separadas. Durante a cópula, ocorre uma aproximação entre as papilas genital e anal femininas, que se justapõem temporariamente, formando uma câmara fechada onde se abre o oviduto, e que serve possivelmente à captura de esperma. Durante a desova, as bordas laterais da papila genital feminina são projetadas anteriormente, adquirindo um formato tubular para ovoposição.(AU)

Analysis of Drought Severity and Duration Using Copulas in Anuradhapura, Sri Lanka.

Anuradhapura district is one of the largest agricultural crop production areas in Sri Lanka. But it is often affected by droughts and droughts caused severe damage for agricultural industry. Thus it is very important to identify the drought characteristics (drought duration and drought severity) and their joint probability distribution to minimize the adverse effects of droughts. Drought characteristics were defined using 3-month standard precipitation index (SPI). It is calculated using monthly rainfall data from 1951 to 2007 in Anuradhapura. Occurrences of 46 drought events were indentified using the calculated SPI. Since dependency nature of the drought variables, copula based joint distribution was used to calculate the joint distribution. The joint distribution could be obtained by combining the marginal distributions using copula. Five copulas were examined and compared to find the best fitted copula to represent the joint distribution. The best marginal distributions were identified as the gamma distributions for drought durations and drought severity using AIC, BIC and Kolmogorov-Smirnov test. Frank copula was identified as the best copula based on AIC, BIC and Cramer-Von Mises statistics. The joint distribution was derived combining the gamma distributions using the Frank copula. The univariate and joint returns periods of droughts were calculated. A drought event occurred in 1974 was identified as a major drought event. Drought duration and severity in 1974 were 9 months and 10.95 respectively. Using the indentified univariate and multivariate return periods, drought risks could be minimized by preplanning and making decision against adverse effects.

Extra group copulation in alouatta caraya (primates, atelidae) living on an island of urban forest from southeast São Paulo, Brazil

Extra group copulations are rarely observed among the Alouatta genus, which lives in a fragmented area in Brazil. Here, we describe the second extra group copulation in A. caraya in literature, which was the first from Brazil. This happened in the southeast urban island forest, which measures 25 ha. In this forest there are two troops: one of them with thirteen howlers and the other with four. These howlers may be extinct in a few years since in the region there is only 3.89 % of native forests and high anthropic action due to agribusiness. We discuss the possible issues that led to the extra group copulation.

Cópulas extra grupo raramente são observados em animais do gênero Alouatta, que vivem em áreas fragmentadas do Brasil. Aqui, descrevemos a segunda cópula extra grupo em A. caraya na literatura, que foi a primeira do Brasil. Isso aconteceu na floresta ilha urbana sudeste, que mede 25 ha. Nesta floresta existem dois bandos: um deles com treze bugios e o outro com quatro. Estes bugios podem ser extintos em poucos anos, uma vez que na região há apenas 3,89% de florestas nativas e alta ação antrópica, devido ao agronegócio. Nós discutimos os possíveis aspectos que levaram à cópula extra grupo.

Body size, symmetry and courtship behavior of Dysdercus maurus distant (Hemiptera: Pyrrhocoridae)

This study analyses the role of body size and symmetry in the sexual selection and courtship behavior of Dysdercus maurus Distant. Sexual conflicts signaled by coercive mating, female resistance, and pre-copulation fights illustrate the mating system. Male-female struggles were observed in all mating attempts. Females tried to reject males by pushing or running and even by vigorously shaking their bodies, in attempts to dislodge the male from their dorsum. In spite of sexual conflicts during courtship, females actively chose their mates based on morphological and behavioral traits. Larger males with more symmetrical tibiae and longer tarsi that are better copula imposers were more successful in sexual competition. Evidence is presented that sexual conflict and female mate choice should not be mutually excluded.

Forced copulation attempt in the Blue-tailed Lizard, Micrablepharus maximiliani (Reinhardt & Luetken, 1862) (Squamata, Gymnophthalmidae) in the Caatinga of Northeastern Brazil / Tentativa de cópula forçada no lagartinho-do-rabo-azul, Micrablepharus maximiliani (Reinhardt & Luetken, 1862) (Squamata, Gymnophthalmidae) na Caatinga do Nordeste do Brasil

Forced copulation is characterized by jerky and rapid movements performed by a female in an apparent attempt to escape from a mounting male. This short communication reports a forced copulation attempt by the gymnophthalmid lizard Micrablepharus maximiliani in a forest enclave inside the Caatinga biome, Tenente Laurentino Cruz municipality, Rio Grande do Norte, Brazil. The rejection behavior of the female consisted of running, pushing and hiding from the mounting male. Although the causes of female mate rejection remain unclear, it may be possible that on this occasion the female M. maximiliani may not have been reproductively active and/or avoided the male deliberately.

A cópula forçada é caracterizada por movimentos bruscos e rápidos realizados por uma fêmea em uma aparente tentativa de escapar de um macho no ato da monta. Esta comunicação relata uma tentativa de cópula forçada pelo lagarto gimnoftalmídeo Micrablepharus maximiliani em um enclave de floresta dentro do bioma Caatinga, município de Tenente Laurentino Cruz, Rio Grande do Norte, Brasil. O comportamento de rejeição da fêmea consistiu de correr, empurrar e se esconder do macho durante a monta. Embora as causas da rejeição do parceiro pela fêmea não sejam claras, pode ser possível que nesta ocasião a fêmea de M. maximiliani não estava reprodutivamente ativa e/ou evitou o macho deliberadamente.

PATRONES DE ALIMENTACIÓN, SUEÑO Y ACTIVIDAD REPRODUCTIVA EN JERBOS DE MONGOLIA (Meriones unguiculatus) / PATTERNS OF FEEDING, SLEEP AND REPRODUCTIVE BEHAVIOR IN MONGOLIAN GERBILS (Meriones unguiculatus)

Los jerbos de Mongolia son roedores utilizados como excelente modelo biológico. A pesar de esto, su clasificación como especie diurna, nocturna o crepuscular no ha sido clara. Los experimentos que se presentan en este artículo evaluaron patrones de alimentación, sueño-actividad y actividad reproductiva y copulativa en condiciones de luz/oscuridad 12:12 en Jerbos de Mongolia. Los resultados de los experimentos sugieren un patrón nocturno de comportamiento en estos roedores.

Mongolian Gerbils are often used as a biological model, but it remains unclear whether these rodents display nocturnal, diurnal, or crepuscular patterns of behavior. The experiments presented below studied patterns of sleep-activity, feeding, and reproductive behavior under 12:12 light dark cycles. All data from these experiments suggest a nocturnal pattern of behavior in these rodents.

Podisus nigrispinus requer cópulas longas para o sucesso reprodutivo / Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae) requires long matings for successful reproduction

The occurrence of multiple and long matings seem to play an important role in the reproduction of the predatory stinkbugs such as Podisus nigrispinus (Dallas). However, the mechanisms underlying these behaviors remain unclear. In this study, the reproduction of P. nigrispinus was investigated as function of females' choice for their mating pair based on male body size and previous mating status, risk of predation and duration of mating. The female mating behavior was studied with female having multiple, partial or no partner choice based on male body size. Time to initiate a mating and its duration was observed after pairing males and females under risk of predation imposed by the presence of the predatory wasp Polistes versicolor Oliver. In addition, aiming to determine the reasons for long lasting matings, female had their mating interrupted at different intervals. Our data indicated that P. nigrispinus females do not select male partners as function of their body size and mating status. Duration of mating, mating partners' choice, and female fecundity and fertility were not influenced by the male size and risk of predation imposed by the predatory wasps. Mating interrupted after 30, 60, 120 and 240 min resulted in only 0, 3.1, 7.7 and 34 percent of egg hatching compared to 74.2 percent under uninterrupted mating (338 to 671 min long). Therefore, the reproductive success of P. nigrispinus females does not depend on male size and male mating status, but requires long-lasting mating as a condition for adequate spermatozoa transference to females instead.

A realização de múltiplas e longas cópulas parece ser importante para a reprodução de percevejos predadores como Podisus nigrispinus (Dallas), mas o comportamento governando essas características permanece desconhecido. Neste estudo foram investigados o comportamento de cópula e a reprodução de P. nigrispinus em função do tamanho do macho, seu status prévio de acasalamento, risco de predação e interrupção de cópulas. A escolha da fêmea para o acasalamento foi estudada sob múltipla escolha, parcial ou sem chance de escolha por machos grandes ou pequenos. O comportamento para o início do acasalamento e tempo de cópula sob risco de predação quando na presença de Polistes versicolor Oliver foi comparado àquele de casais sem risco de predação. Machos e fêmeas de P. nigrispinus acasalaram independentemente do tamanho e status prévio de acasalamento dos machos, além de não apresentarem preferência por parceiros. A duração da cópula, escolha do parceiro e fertilidade das fêmeas não foram influenciadas pelo tamanho do macho, nem a presença do predador alterou o comportamento de acasalamento e duração de cópula. Fêmeas com cópulas interrompidas após 30, 60, 120 e 240 min apresentaram baixa viabilidade de ovos (0; 3,1; 7,7 e 34 por cento, respectivamente), enquanto aquelas com tempo natural de cópula (338 a 671 min) obtiveram 74,2 por cento de viabilidade. Portanto, o sucesso reprodutivo de P. nigrispinus não depende do tamanho do macho ou de seu status de acasalamento, mas requer longas cópulas para a transferência de espermatozóides.