The biology and ecology of the ocean sunfish Mola mola: a review of current knowledge and future research perspectives

Relatively little is known about the biology and ecology of the world's largest (heaviest) bony fish, the ocean sunfish Mola mola, despite its worldwide occurrence in temperate and tropical seas. Studies are now emerging that require many common perceptions about sunfish behaviour and ecology to be re-examined. Indeed, the long-held view that ocean sunfish are an inactive, passively drifting species seems to be entirely misplaced. Technological advances in marine telemetry are revealing distinct behavioural patterns and protracted seasonal movements. Extensive forays by ocean sunfish into the deep ocean have been documented and broad-scale surveys, together with molecular and laboratory based techniques, are addressing the connectivity and trophic role of these animals. These emerging molecular and movement studies suggest that local distinct populations may be prone to depletion through bycatch in commercial fisheries. Rising interest in ocean sunfish, highlighted by the increase in recent publications, warrants a thorough review of the biology and ecology of this species. Here we review the taxonomy, morphology, geography, diet, locomotion, vision, movements, foraging ecology, reproduction and species interactions of M. mola. We present a summary of current conservation issues and suggest methods for addressing fundamental gaps in our knowledge.

Preservation methods alter stable isotope values in gelatinous zooplankton: implications for interpreting trophic ecology

Jellyfish are increasingly topical within studies of marine food webs. Stable isotope analysis represents a valuable technique to unravel the complex trophic role of these long-overlooked species. In other taxa, sample preservation has been shown to alter the isotopic values of species under consideration, potentially leading to misinterpretation of trophic ecology. To identify potential preservation effects in jellyfish, we collected Aurelia aurita from Strangford Lough (54(o)22'44.73aEuro(3)N, 5(o)32'53.44aEuro(3)W) during May 2009 and processed them using three different methods prior to isotopic analysis (unpreserved, frozen and preserved in ethanol). A distinct preservation effect was found on delta N-15 values: furthermore, preservation also influenced the positive allometric relationship between individual size and delta N-15 values. Conversely, delta C-13 values remained consistent between the three preservation methods, conflicting with previous findings for other invertebrate, fish and mammalian species. These findings have implications for incorporation of jellyfish into marine food webs and remote sampling regimes where preservation of samples is unavoidable.

Maternal situations: Sectarianism and civility in a divided city

This paper explores the tensions between civility and sectarianism in contemporary Belfast. Drawing on interviews with mothers engaged in raising young children in the largely working class and divided inner city, the paper offers a pragmatic account of the dynamics of social reproduction and change. This is pursued through an analysis of the interplay between expectations of civility and sectarianism in four specific situations: walking, shopping, playing and schooling. The tensions and dilemmas of maternal action as the divided inner city is navigated indicate the constitutive role situations play in shaping maternal action. The situation of motherhood itself, both at the centre of ethno-national reproduction and at the interface of public and private life, is not insignificant in routinely drawing mothers into the everyday dynamics of post-conflict continuity and change.

‘Marxism and Ecology: From Political Economy to Political Ecology’

One of the reasons for the 'fin de seicle' angst within western liberal capitalist societies is the rise in prominance of ecological concerns within these societies. Long before the New Right declared the post-war welfare state to be untenable, early green critics had claimed it to be ecologically unsustainable. The addiction of the welfare state on ever increasing levels of economic growth was pronounced to be simply impossible within the context of a finite planet. Although it was not expressed in this manner, what these early ecological concerns with Limits to Growth were in effect saying was that the accumulation of capital rendered capitalism unsustainable. Yet the ecological critique of capitalism has not found much favour within the Marxist critique untile recently. Early Marxist analyses of the ecology movement dismissed them as ‘petty bourgeios radicals’ while many greens still view Marxism as ‘fair shares in extinction’. The lack of positive engagement and dialogue between Marxism and ecology has in recent years been put right with a discernable overlap between the two critiques of capitalism. This article seeks to present the areas of disagreement and agreement between the two and seeks to provide an ‘environmental audit’ on both the Marxist method and political project.