The hake (Merluccius merluccius) fishery occupies an important place in the Moroccan trawl fishery. Despite the ecological and commercial value of this species, the reproductive biology of European hake populations in Moroccan coastal waters has been little studied. Here, we describe the seasonal variations of gonad histology of hake collected from...
Published in Conservation biology : the journal of the Society for Conservation Biology
森林破碎化会引起生物多样性下降及生态系统衰败, 在最初阶段, 数量丰富的物种可能变得稀少甚至灭绝。然而, 一些物种在森林破碎化后延迟灭绝的根本机制尚不清楚。物种数量下降可能是因为种群更替所需的繁殖成鸟数量不足, 也可能是因为种群增长减缓或巢穴捕食压力增加导致幼鸟存活率下降。本研究利用在巴西马瑙斯附近进行的森林破碎化生物动态项目得到的破碎化前5年和后4年总计10年的鸟类环志数据, 探究了关于繁殖活动的假设, 即发生森林破碎化后鸟类的繁殖活动相对减少, 幼鸟数量相对下降。我们比较了3种类型的森林(原始林、孤立前的森林斑块和孤立后的森林斑块)中的活跃繁殖成鸟和幼鸟的捕获率, 以及在隔离前后每种森林类型中的活跃繁殖成鸟及幼鸟与所有鸟类的比例。我们将鸟类按食性(食虫或食果)和筑巢策略(开杯式、空腔式或...
Published in Conservation biology : the journal of the Society for Conservation Biology
气候变暖可能严重影响卵生物种的胚胎发育和幼体生长。由于产卵事件先后发生在整个繁殖季节, 评估气候变暖对卵生物种繁殖的总体影响十分困难。一次成功的产卵除了让胚胎能够完成发育外, 还需要让卵在有利于后代生存和能量积累的时机孵化。我们提出了一个新的指标--产卵机会(EO) --用来估计一年中一窝新产卵能够产生成功越冬后代的时间。结合微气候数据、胚胎发育数据和生物物理模型, 我们估算了模式物种东部强棱蜥(Sceloporus undulatus)在当前气候条件和气候变暖情景下, 其分布范围内的EO。我们预测, 在东部强棱蜥分布区内的11407个位点中, 74.8%的位点的EO将随着气候变暖而缩短。由孵化成功率降低和后代能量积累减少所造成的EO损失(72.6%和72.9%)大于由新生幼体热压力所造成的...
An important small-scale fishery in Majorca targets three similar goby species: Aphia minuta, Pseudaphia ferreri and Crystallogobius linearis. Histological examination of the gonads of these species sampled from landings during the fishing season revealed characteristic reproductive traits that could be defined as abbreviate iteroparity. The transp...
Introduction. The kinematic patterns of semen are influenced by individual variation and/or environmental effects, determined by the handling after sample collection. Objective. To evaluate the effect of two commercial extenders, bull age, and sexual status on the motility and kinetics parameters of fresh bovine semen. Materials and methods. The st...
It is a proven reality that in Spain the number of births achieved through surrogacy agreements, celebrated outside our borders, by Spanish citizens, is booming. This has led to important legal conflicts that have generated an absolute regulatory incoherence. As a solution, we understand that the time has come to integrate a guaranteed and guided l...
Many studies have considered the temporal patterns of reproduction of Engraulis ringens, but little attention has been given to the spatial patterns of reproduction (spawning areas), which have shown great variability in both location (geographical position) and extent (the area covered by positive stations), without a satisfactory explanation. Alo...
Published in Family process
Las parejas de bajos recursos tienen mayor riesgo de inestabilidad en las relaciones y de divorcio. En respuesta a esto, se han desarrollado programas de educación sobre las relaciones, como ePREP y OurRelationship, con el fin de llegar más fácilmente a esta población. Un ensayo previo indicó que estos programas promueven el funcionamiento de las r...
Resumen El mejoramiento genético en plantas permite incrementar el rendimiento, productividad y resistencia al estrés al modificar el genotipo de la progenie. El objetivo del presente trabajo fue revisar los criterios de selección que apoyen la implementación de programas de mejoramiento genético de Moringa oleifera enfocados en producción y resist...
This study challenges the ontological, epistemological, and methodological limitations of classical, neoclassical, and Marxist paradigms to rethink the problem of transformation and formation of value in the economic circuit. This approach rescues the philosophical postulate of Arthur (2004) firstly, to materialise it, in a theoretical equation tha...
