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This article aims to elucidate the relationship between the ideas of state, constitution, and Parliament in the Spanish constitutional debate of 1931. It argues that Members of Parliament (MPs) made a valuable contribution when understanding the relevance of this interrelation in terms of political philosophy and legal theory. From a methodological perspective, this study pays attention to the arguments of MPs in the course of the constitutional sessions which took place between August and December 1931. In doing so, it portrays the ideological differences of left-wing, centrist and right-wing parties in that constituent assembly. In the first section (“European influences on the Constitution of 1931”) the intellectual links with interwar trends of public law, administrative law and European constitutionalism are highlighted. The second section (“Constitution and Parliament according to Spanish representatives”), shows the meanings given to this nascent constitutional democracy by MPs. Despite their ideological differences they were in favour of strengthening Parliament and the Constitution as a prerequisite for safeguarding democracy. The conclusions resume the argumentative thread, that is to say, that the regime, a democratic republic, was understood by a large majority of MPs as the confluence of three conditions founded on doctrinal and conceptual exchanges from interwar European constitutionalism: the acknowledgement of parliamentary sovereignty, the legal and administrative revamping of institutions, and state intervention in the economy.

This paper aims to answer the question of why constituent moments are relevant to political theory. It hypothesises the Spanish constitutional debate of 1931 as a case of conceptual innovation in parliamentary politics by arguing that debates in constituent moments entail a special kind of parliamentary argumentation when new political regimes are established. There, all sorts of theoretical, normative, historical, and institutional aspects are discussed to deliberate on the future character and functioning of a political regime. From a methodological point of view, this analysis draws on the revision of arguments and political terms used by MPs during the Spanish constituent assembly of 1931. The first part of the article emphasises the potentiality of constitutional debates for political theory and conceptual history, the two following chapters contextualise the historical and intellectual keys of 1931 Spain, the fourth and final part briefly explains two cases of conceptual controversy around the terms “state” and “sovereignty”. Based on the evidence provided by this study, the article concludes that the Spanish constitutional debate of 1931 is a fertile case to explore conceptual innovation of interwar legal and political theory.

Off-channel areas are one of the most impacted aquatic habitats by humans globally, as extensive agricultural and urban development has limited them to roughly 10% of historical extent. This is also true for California’s Sacramento River Valley, where historically frequent widespread inundation has been reduced to a few off-channel water bodies along the mid-Sacramento River. This remaining shallow-water habitat provides crucial ecological benefits to multiple avian and fish species, but especially to floodplain-adapted species such as Chinook salmon (Oncorhynchus tshawytscha). Characterizing spatiotemporal off-channel dynamics, including inundation extent and residence time, is fundamental to better understanding the intrinsic value of such habitats and their potential to support recovery actions. Remote sensing techniques have been increasingly used to map surface water at regional and local scales, with improved resolutions. As such, this study maps off-channel inundation areas and describes their temporal dynamics by analyzing pixel-based time- series of multiple water indices, modified Normalized Difference Water Index (mNDWI) and the Automated Water Extraction Index (AWEI), generated from LandSat-8 and Sentinel-2 data between 2013–2021. Quantified off-channel area was similar with each water index and method used, but improved performance was associated with Sentinel-2 products and AWEI index to identify wetted areas under lower mainstem discharges. Results indicate an uneven distribution of off-channel habitat in the study area, with limited inundated areas in upstream reaches (3/s, an important migration cue for endangered winter-run Chinook salmon, limiting juvenile access to areas with enhanced rearing conditions. Off-channel habitat residence times averaged between 7 and 16 days, primarily defined by the rate of receding flows, with rapid flow recession providing marginal off-channel habitat. This study shows reasonable performance of moderate resolution LandSat-8 and Sentinel-2 remote sensing imagery to characterize shallow-water inundated habitat in higher-order rivers, and as a method to inform restoration and native fish recovery efforts.